Depth-wise attenuation mechanism of seismic waves in the Andaman region
This study evaluates the depth-dependent seismic wave attenuation characteristics in the Andaman region which is a part of the Andaman-Nicobar Subduction zone (ANSZ), and possible causes. We have analyzed seismic waveforms of 1402 earthquakes recorded at seven broadband seismic stations located over...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Dutta, Abhisek [verfasserIn] |
|---|
| Format: |
E-Artikel |
|---|---|
| Sprache: |
Englisch |
| Erschienen: |
2021 |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
Enthalten in: Soil dynamics and earthquake engineering - Amsterdam [u.a.] : Elsevier Science, 2011, 151 |
|---|---|
| Übergeordnetes Werk: |
volume:151 |
| DOI / URN: |
10.1016/j.soildyn.2021.107000 |
|---|
| Katalog-ID: |
ELV006777880 |
|---|
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| 245 | 1 | 0 | |a Depth-wise attenuation mechanism of seismic waves in the Andaman region |
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| 520 | |a This study evaluates the depth-dependent seismic wave attenuation characteristics in the Andaman region which is a part of the Andaman-Nicobar Subduction zone (ANSZ), and possible causes. We have analyzed seismic waveforms of 1402 earthquakes recorded at seven broadband seismic stations located over the Andaman Island, to estimate the direct S-wave (Q s ), coda wave (Q c ), intrinsic (Q i ) and scattering (Q sc ) attenuation parameters. The coda normalization method is used to calculate Q s . Additionally, the variation of Q c with frequency and coda window length is studied using the single back-scattering method. The separation of Q i and Q sc is achieved using the Wennerberg’s method. Results show a strong frequency dependence of Q c and Q s . At 1 Hz, the values of Q c are 136, 137, 137 and 146 for coda window length of 30, 40, 50 and 60 s respectively, with the corresponding frequency-dependent coefficient (n) of 0.82, 0.83, 0.85 and 0.82. At 1 Hz the observed Q i values show a close proximity to Q c values, which indicates a strong dominance of intrinsic attenuation. Also, it is observed that Q 0i shows low value and remains almost the same between 115 and 132 km depth, with a slight increase in between 132 − 140 km. The observed results imply high intrinsic attenuation, possibly due to partial melting or fluid-filled rocks at these depths. Whereas Q 0sc shows a different trend. It gradually increases up to a depth of 132 km, with a slight decrease beyond that. This indicates a decrease in heterogeneity up to 132 km and a slight increase in the same below that. Further, the estimates of pressure (P) and temperature (T) conditions of the subducting slab with depth show an increase in temperature from 996° to 1015°C and an increase in pressure from 33.8 to 41.2 kbar, as the depth increases from 115 to 140 km. The phase relationship for the basaltic rocks with 5 − 6 wt% bound H 2 O in eclogite facies reveals that the P − T condition observed in this study lies above the solidus temperature. This promotes the formation of interstitial liquid (5 − 10%) at these depths, probably causing high intrinsic attenuation. | ||
| 650 | 4 | |a Coda wave | |
| 650 | 4 | |a Seismic attenuation | |
| 650 | 4 | |a Andaman Islands | |
| 650 | 4 | |a Andaman-Nicobar subduction zone | |
| 650 | 4 | |a Intrinsic and scattering attenuation | |
| 700 | 1 | |a Biswas, Rahul |0 (orcid)0000-0001-8177-526X |4 oth | |
| 700 | 1 | |a Singh, Chandrani |4 oth | |
| 700 | 1 | |a Kumar, M. Ravi |4 oth | |
| 700 | 1 | |a Jana, Niptika |4 oth | |
| 700 | 1 | |a Singh, Arun |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |t Soil dynamics and earthquake engineering |d Amsterdam [u.a.] : Elsevier Science, 2011 |g 151 |w (DE-627)308449487 |w (DE-600)1502466-0 |7 nnns |
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10.1016/j.soildyn.2021.107000 doi (DE-627)ELV006777880 (ELSEVIER)S0267-7261(21)00422-X DE-627 ger DE-627 rda eng 510 620 550 DE-600 31 38 550 560 sdnb 56.11 bkl 56.20 bkl Dutta, Abhisek verfasserin aut Depth-wise attenuation mechanism of seismic waves in the Andaman region 2021 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This study evaluates the depth-dependent seismic wave attenuation characteristics in the Andaman region which is a part of the Andaman-Nicobar Subduction zone (ANSZ), and possible causes. We have analyzed seismic waveforms of 1402 earthquakes recorded at seven broadband seismic stations located over the Andaman Island, to estimate the direct S-wave (Q s ), coda wave (Q c ), intrinsic (Q i ) and scattering (Q sc ) attenuation parameters. The coda normalization method is used to calculate Q s . Additionally, the variation of Q c with frequency and coda window length is studied using the single back-scattering method. The separation of Q i and Q sc is achieved using the Wennerberg’s method. Results show a strong frequency dependence of Q c and Q s . At 1 Hz, the values of Q c are 136, 137, 137 and 146 for coda window length of 30, 40, 50 and 60 s respectively, with the corresponding frequency-dependent coefficient (n) of 0.82, 0.83, 0.85 and 0.82. At 1 Hz the observed Q i values show a close proximity to Q c values, which indicates a strong dominance of intrinsic attenuation. Also, it is observed that Q 0i shows low value and remains almost the same between 115 and 132 km depth, with a slight increase in between 132 − 140 km. The observed results imply high intrinsic attenuation, possibly due to partial melting or fluid-filled rocks at these depths. Whereas Q 0sc shows a different trend. It gradually increases up to a depth of 132 km, with a slight decrease beyond that. This indicates a decrease in heterogeneity up to 132 km and a slight increase in the same below that. Further, the estimates of pressure (P) and temperature (T) conditions of the subducting slab with depth show an increase in temperature from 996° to 1015°C and an increase in pressure from 33.8 to 41.2 kbar, as the depth increases from 115 to 140 km. The phase relationship for the basaltic rocks with 5 − 6 wt% bound H 2 O in eclogite facies reveals that the P − T condition observed in this study lies above the solidus temperature. This promotes the formation of interstitial liquid (5 − 10%) at these depths, probably causing high intrinsic attenuation. Coda wave Seismic attenuation Andaman Islands Andaman-Nicobar subduction zone Intrinsic and scattering attenuation Biswas, Rahul (orcid)0000-0001-8177-526X oth Singh, Chandrani oth Kumar, M. Ravi oth Jana, Niptika oth Singh, Arun oth Enthalten in Soil dynamics and earthquake engineering Amsterdam [u.a.] : Elsevier Science, 2011 151 (DE-627)308449487 (DE-600)1502466-0 nnns volume:151 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-GEO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 56.11 56.20 AR 151 |
| spelling |
10.1016/j.soildyn.2021.107000 doi (DE-627)ELV006777880 (ELSEVIER)S0267-7261(21)00422-X DE-627 ger DE-627 rda eng 510 620 550 DE-600 31 38 550 560 sdnb 56.11 bkl 56.20 bkl Dutta, Abhisek verfasserin aut Depth-wise attenuation mechanism of seismic waves in the Andaman region 2021 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This study evaluates the depth-dependent seismic wave attenuation characteristics in the Andaman region which is a part of the Andaman-Nicobar Subduction zone (ANSZ), and possible causes. We have analyzed seismic waveforms of 1402 earthquakes recorded at seven broadband seismic stations located over the Andaman Island, to estimate the direct S-wave (Q s ), coda wave (Q c ), intrinsic (Q i ) and scattering (Q sc ) attenuation parameters. The coda normalization method is used to calculate Q s . Additionally, the variation of Q c with frequency and coda window length is studied using the single back-scattering method. The separation of Q i and Q sc is achieved using the Wennerberg’s method. Results show a strong frequency dependence of Q c and Q s . At 1 Hz, the values of Q c are 136, 137, 137 and 146 for coda window length of 30, 40, 50 and 60 s respectively, with the corresponding frequency-dependent coefficient (n) of 0.82, 0.83, 0.85 and 0.82. At 1 Hz the observed Q i values show a close proximity to Q c values, which indicates a strong dominance of intrinsic attenuation. Also, it is observed that Q 0i shows low value and remains almost the same between 115 and 132 km depth, with a slight increase in between 132 − 140 km. The observed results imply high intrinsic attenuation, possibly due to partial melting or fluid-filled rocks at these depths. Whereas Q 0sc shows a different trend. It gradually increases up to a depth of 132 km, with a slight decrease beyond that. This indicates a decrease in heterogeneity up to 132 km and a slight increase in the same below that. Further, the estimates of pressure (P) and temperature (T) conditions of the subducting slab with depth show an increase in temperature from 996° to 1015°C and an increase in pressure from 33.8 to 41.2 kbar, as the depth increases from 115 to 140 km. The phase relationship for the basaltic rocks with 5 − 6 wt% bound H 2 O in eclogite facies reveals that the P − T condition observed in this study lies above the solidus temperature. This promotes the formation of interstitial liquid (5 − 10%) at these depths, probably causing high intrinsic attenuation. Coda wave Seismic attenuation Andaman Islands Andaman-Nicobar subduction zone Intrinsic and scattering attenuation Biswas, Rahul (orcid)0000-0001-8177-526X oth Singh, Chandrani oth Kumar, M. Ravi oth Jana, Niptika oth Singh, Arun oth Enthalten in Soil dynamics and earthquake engineering Amsterdam [u.a.] : Elsevier Science, 2011 151 (DE-627)308449487 (DE-600)1502466-0 nnns volume:151 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-GEO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 56.11 56.20 AR 151 |
| allfields_unstemmed |
10.1016/j.soildyn.2021.107000 doi (DE-627)ELV006777880 (ELSEVIER)S0267-7261(21)00422-X DE-627 ger DE-627 rda eng 510 620 550 DE-600 31 38 550 560 sdnb 56.11 bkl 56.20 bkl Dutta, Abhisek verfasserin aut Depth-wise attenuation mechanism of seismic waves in the Andaman region 2021 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This study evaluates the depth-dependent seismic wave attenuation characteristics in the Andaman region which is a part of the Andaman-Nicobar Subduction zone (ANSZ), and possible causes. We have analyzed seismic waveforms of 1402 earthquakes recorded at seven broadband seismic stations located over the Andaman Island, to estimate the direct S-wave (Q s ), coda wave (Q c ), intrinsic (Q i ) and scattering (Q sc ) attenuation parameters. The coda normalization method is used to calculate Q s . Additionally, the variation of Q c with frequency and coda window length is studied using the single back-scattering method. The separation of Q i and Q sc is achieved using the Wennerberg’s method. Results show a strong frequency dependence of Q c and Q s . At 1 Hz, the values of Q c are 136, 137, 137 and 146 for coda window length of 30, 40, 50 and 60 s respectively, with the corresponding frequency-dependent coefficient (n) of 0.82, 0.83, 0.85 and 0.82. At 1 Hz the observed Q i values show a close proximity to Q c values, which indicates a strong dominance of intrinsic attenuation. Also, it is observed that Q 0i shows low value and remains almost the same between 115 and 132 km depth, with a slight increase in between 132 − 140 km. The observed results imply high intrinsic attenuation, possibly due to partial melting or fluid-filled rocks at these depths. Whereas Q 0sc shows a different trend. It gradually increases up to a depth of 132 km, with a slight decrease beyond that. This indicates a decrease in heterogeneity up to 132 km and a slight increase in the same below that. Further, the estimates of pressure (P) and temperature (T) conditions of the subducting slab with depth show an increase in temperature from 996° to 1015°C and an increase in pressure from 33.8 to 41.2 kbar, as the depth increases from 115 to 140 km. The phase relationship for the basaltic rocks with 5 − 6 wt% bound H 2 O in eclogite facies reveals that the P − T condition observed in this study lies above the solidus temperature. This promotes the formation of interstitial liquid (5 − 10%) at these depths, probably causing high intrinsic attenuation. Coda wave Seismic attenuation Andaman Islands Andaman-Nicobar subduction zone Intrinsic and scattering attenuation Biswas, Rahul (orcid)0000-0001-8177-526X oth Singh, Chandrani oth Kumar, M. Ravi oth Jana, Niptika oth Singh, Arun oth Enthalten in Soil dynamics and earthquake engineering Amsterdam [u.a.] : Elsevier Science, 2011 151 (DE-627)308449487 (DE-600)1502466-0 nnns volume:151 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-GEO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 56.11 56.20 AR 151 |
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10.1016/j.soildyn.2021.107000 doi (DE-627)ELV006777880 (ELSEVIER)S0267-7261(21)00422-X DE-627 ger DE-627 rda eng 510 620 550 DE-600 31 38 550 560 sdnb 56.11 bkl 56.20 bkl Dutta, Abhisek verfasserin aut Depth-wise attenuation mechanism of seismic waves in the Andaman region 2021 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This study evaluates the depth-dependent seismic wave attenuation characteristics in the Andaman region which is a part of the Andaman-Nicobar Subduction zone (ANSZ), and possible causes. We have analyzed seismic waveforms of 1402 earthquakes recorded at seven broadband seismic stations located over the Andaman Island, to estimate the direct S-wave (Q s ), coda wave (Q c ), intrinsic (Q i ) and scattering (Q sc ) attenuation parameters. The coda normalization method is used to calculate Q s . Additionally, the variation of Q c with frequency and coda window length is studied using the single back-scattering method. The separation of Q i and Q sc is achieved using the Wennerberg’s method. Results show a strong frequency dependence of Q c and Q s . At 1 Hz, the values of Q c are 136, 137, 137 and 146 for coda window length of 30, 40, 50 and 60 s respectively, with the corresponding frequency-dependent coefficient (n) of 0.82, 0.83, 0.85 and 0.82. At 1 Hz the observed Q i values show a close proximity to Q c values, which indicates a strong dominance of intrinsic attenuation. Also, it is observed that Q 0i shows low value and remains almost the same between 115 and 132 km depth, with a slight increase in between 132 − 140 km. The observed results imply high intrinsic attenuation, possibly due to partial melting or fluid-filled rocks at these depths. Whereas Q 0sc shows a different trend. It gradually increases up to a depth of 132 km, with a slight decrease beyond that. This indicates a decrease in heterogeneity up to 132 km and a slight increase in the same below that. Further, the estimates of pressure (P) and temperature (T) conditions of the subducting slab with depth show an increase in temperature from 996° to 1015°C and an increase in pressure from 33.8 to 41.2 kbar, as the depth increases from 115 to 140 km. The phase relationship for the basaltic rocks with 5 − 6 wt% bound H 2 O in eclogite facies reveals that the P − T condition observed in this study lies above the solidus temperature. This promotes the formation of interstitial liquid (5 − 10%) at these depths, probably causing high intrinsic attenuation. Coda wave Seismic attenuation Andaman Islands Andaman-Nicobar subduction zone Intrinsic and scattering attenuation Biswas, Rahul (orcid)0000-0001-8177-526X oth Singh, Chandrani oth Kumar, M. Ravi oth Jana, Niptika oth Singh, Arun oth Enthalten in Soil dynamics and earthquake engineering Amsterdam [u.a.] : Elsevier Science, 2011 151 (DE-627)308449487 (DE-600)1502466-0 nnns volume:151 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-GEO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 56.11 56.20 AR 151 |
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10.1016/j.soildyn.2021.107000 doi (DE-627)ELV006777880 (ELSEVIER)S0267-7261(21)00422-X DE-627 ger DE-627 rda eng 510 620 550 DE-600 31 38 550 560 sdnb 56.11 bkl 56.20 bkl Dutta, Abhisek verfasserin aut Depth-wise attenuation mechanism of seismic waves in the Andaman region 2021 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This study evaluates the depth-dependent seismic wave attenuation characteristics in the Andaman region which is a part of the Andaman-Nicobar Subduction zone (ANSZ), and possible causes. We have analyzed seismic waveforms of 1402 earthquakes recorded at seven broadband seismic stations located over the Andaman Island, to estimate the direct S-wave (Q s ), coda wave (Q c ), intrinsic (Q i ) and scattering (Q sc ) attenuation parameters. The coda normalization method is used to calculate Q s . Additionally, the variation of Q c with frequency and coda window length is studied using the single back-scattering method. The separation of Q i and Q sc is achieved using the Wennerberg’s method. Results show a strong frequency dependence of Q c and Q s . At 1 Hz, the values of Q c are 136, 137, 137 and 146 for coda window length of 30, 40, 50 and 60 s respectively, with the corresponding frequency-dependent coefficient (n) of 0.82, 0.83, 0.85 and 0.82. At 1 Hz the observed Q i values show a close proximity to Q c values, which indicates a strong dominance of intrinsic attenuation. Also, it is observed that Q 0i shows low value and remains almost the same between 115 and 132 km depth, with a slight increase in between 132 − 140 km. The observed results imply high intrinsic attenuation, possibly due to partial melting or fluid-filled rocks at these depths. Whereas Q 0sc shows a different trend. It gradually increases up to a depth of 132 km, with a slight decrease beyond that. This indicates a decrease in heterogeneity up to 132 km and a slight increase in the same below that. Further, the estimates of pressure (P) and temperature (T) conditions of the subducting slab with depth show an increase in temperature from 996° to 1015°C and an increase in pressure from 33.8 to 41.2 kbar, as the depth increases from 115 to 140 km. The phase relationship for the basaltic rocks with 5 − 6 wt% bound H 2 O in eclogite facies reveals that the P − T condition observed in this study lies above the solidus temperature. This promotes the formation of interstitial liquid (5 − 10%) at these depths, probably causing high intrinsic attenuation. Coda wave Seismic attenuation Andaman Islands Andaman-Nicobar subduction zone Intrinsic and scattering attenuation Biswas, Rahul (orcid)0000-0001-8177-526X oth Singh, Chandrani oth Kumar, M. Ravi oth Jana, Niptika oth Singh, Arun oth Enthalten in Soil dynamics and earthquake engineering Amsterdam [u.a.] : Elsevier Science, 2011 151 (DE-627)308449487 (DE-600)1502466-0 nnns volume:151 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-GEO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 56.11 56.20 AR 151 |
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Dutta, Abhisek @@aut@@ Biswas, Rahul @@oth@@ Singh, Chandrani @@oth@@ Kumar, M. Ravi @@oth@@ Jana, Niptika @@oth@@ Singh, Arun @@oth@@ |
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Dutta, Abhisek |
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depth-wise attenuation mechanism of seismic waves in the andaman region |
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Depth-wise attenuation mechanism of seismic waves in the Andaman region |
| abstract |
This study evaluates the depth-dependent seismic wave attenuation characteristics in the Andaman region which is a part of the Andaman-Nicobar Subduction zone (ANSZ), and possible causes. We have analyzed seismic waveforms of 1402 earthquakes recorded at seven broadband seismic stations located over the Andaman Island, to estimate the direct S-wave (Q s ), coda wave (Q c ), intrinsic (Q i ) and scattering (Q sc ) attenuation parameters. The coda normalization method is used to calculate Q s . Additionally, the variation of Q c with frequency and coda window length is studied using the single back-scattering method. The separation of Q i and Q sc is achieved using the Wennerberg’s method. Results show a strong frequency dependence of Q c and Q s . At 1 Hz, the values of Q c are 136, 137, 137 and 146 for coda window length of 30, 40, 50 and 60 s respectively, with the corresponding frequency-dependent coefficient (n) of 0.82, 0.83, 0.85 and 0.82. At 1 Hz the observed Q i values show a close proximity to Q c values, which indicates a strong dominance of intrinsic attenuation. Also, it is observed that Q 0i shows low value and remains almost the same between 115 and 132 km depth, with a slight increase in between 132 − 140 km. The observed results imply high intrinsic attenuation, possibly due to partial melting or fluid-filled rocks at these depths. Whereas Q 0sc shows a different trend. It gradually increases up to a depth of 132 km, with a slight decrease beyond that. This indicates a decrease in heterogeneity up to 132 km and a slight increase in the same below that. Further, the estimates of pressure (P) and temperature (T) conditions of the subducting slab with depth show an increase in temperature from 996° to 1015°C and an increase in pressure from 33.8 to 41.2 kbar, as the depth increases from 115 to 140 km. The phase relationship for the basaltic rocks with 5 − 6 wt% bound H 2 O in eclogite facies reveals that the P − T condition observed in this study lies above the solidus temperature. This promotes the formation of interstitial liquid (5 − 10%) at these depths, probably causing high intrinsic attenuation. |
| abstractGer |
This study evaluates the depth-dependent seismic wave attenuation characteristics in the Andaman region which is a part of the Andaman-Nicobar Subduction zone (ANSZ), and possible causes. We have analyzed seismic waveforms of 1402 earthquakes recorded at seven broadband seismic stations located over the Andaman Island, to estimate the direct S-wave (Q s ), coda wave (Q c ), intrinsic (Q i ) and scattering (Q sc ) attenuation parameters. The coda normalization method is used to calculate Q s . Additionally, the variation of Q c with frequency and coda window length is studied using the single back-scattering method. The separation of Q i and Q sc is achieved using the Wennerberg’s method. Results show a strong frequency dependence of Q c and Q s . At 1 Hz, the values of Q c are 136, 137, 137 and 146 for coda window length of 30, 40, 50 and 60 s respectively, with the corresponding frequency-dependent coefficient (n) of 0.82, 0.83, 0.85 and 0.82. At 1 Hz the observed Q i values show a close proximity to Q c values, which indicates a strong dominance of intrinsic attenuation. Also, it is observed that Q 0i shows low value and remains almost the same between 115 and 132 km depth, with a slight increase in between 132 − 140 km. The observed results imply high intrinsic attenuation, possibly due to partial melting or fluid-filled rocks at these depths. Whereas Q 0sc shows a different trend. It gradually increases up to a depth of 132 km, with a slight decrease beyond that. This indicates a decrease in heterogeneity up to 132 km and a slight increase in the same below that. Further, the estimates of pressure (P) and temperature (T) conditions of the subducting slab with depth show an increase in temperature from 996° to 1015°C and an increase in pressure from 33.8 to 41.2 kbar, as the depth increases from 115 to 140 km. The phase relationship for the basaltic rocks with 5 − 6 wt% bound H 2 O in eclogite facies reveals that the P − T condition observed in this study lies above the solidus temperature. This promotes the formation of interstitial liquid (5 − 10%) at these depths, probably causing high intrinsic attenuation. |
| abstract_unstemmed |
This study evaluates the depth-dependent seismic wave attenuation characteristics in the Andaman region which is a part of the Andaman-Nicobar Subduction zone (ANSZ), and possible causes. We have analyzed seismic waveforms of 1402 earthquakes recorded at seven broadband seismic stations located over the Andaman Island, to estimate the direct S-wave (Q s ), coda wave (Q c ), intrinsic (Q i ) and scattering (Q sc ) attenuation parameters. The coda normalization method is used to calculate Q s . Additionally, the variation of Q c with frequency and coda window length is studied using the single back-scattering method. The separation of Q i and Q sc is achieved using the Wennerberg’s method. Results show a strong frequency dependence of Q c and Q s . At 1 Hz, the values of Q c are 136, 137, 137 and 146 for coda window length of 30, 40, 50 and 60 s respectively, with the corresponding frequency-dependent coefficient (n) of 0.82, 0.83, 0.85 and 0.82. At 1 Hz the observed Q i values show a close proximity to Q c values, which indicates a strong dominance of intrinsic attenuation. Also, it is observed that Q 0i shows low value and remains almost the same between 115 and 132 km depth, with a slight increase in between 132 − 140 km. The observed results imply high intrinsic attenuation, possibly due to partial melting or fluid-filled rocks at these depths. Whereas Q 0sc shows a different trend. It gradually increases up to a depth of 132 km, with a slight decrease beyond that. This indicates a decrease in heterogeneity up to 132 km and a slight increase in the same below that. Further, the estimates of pressure (P) and temperature (T) conditions of the subducting slab with depth show an increase in temperature from 996° to 1015°C and an increase in pressure from 33.8 to 41.2 kbar, as the depth increases from 115 to 140 km. The phase relationship for the basaltic rocks with 5 − 6 wt% bound H 2 O in eclogite facies reveals that the P − T condition observed in this study lies above the solidus temperature. This promotes the formation of interstitial liquid (5 − 10%) at these depths, probably causing high intrinsic attenuation. |
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We have analyzed seismic waveforms of 1402 earthquakes recorded at seven broadband seismic stations located over the Andaman Island, to estimate the direct S-wave (Q s ), coda wave (Q c ), intrinsic (Q i ) and scattering (Q sc ) attenuation parameters. The coda normalization method is used to calculate Q s . Additionally, the variation of Q c with frequency and coda window length is studied using the single back-scattering method. The separation of Q i and Q sc is achieved using the Wennerberg’s method. Results show a strong frequency dependence of Q c and Q s . At 1 Hz, the values of Q c are 136, 137, 137 and 146 for coda window length of 30, 40, 50 and 60 s respectively, with the corresponding frequency-dependent coefficient (n) of 0.82, 0.83, 0.85 and 0.82. At 1 Hz the observed Q i values show a close proximity to Q c values, which indicates a strong dominance of intrinsic attenuation. Also, it is observed that Q 0i shows low value and remains almost the same between 115 and 132 km depth, with a slight increase in between 132 − 140 km. The observed results imply high intrinsic attenuation, possibly due to partial melting or fluid-filled rocks at these depths. Whereas Q 0sc shows a different trend. It gradually increases up to a depth of 132 km, with a slight decrease beyond that. This indicates a decrease in heterogeneity up to 132 km and a slight increase in the same below that. Further, the estimates of pressure (P) and temperature (T) conditions of the subducting slab with depth show an increase in temperature from 996° to 1015°C and an increase in pressure from 33.8 to 41.2 kbar, as the depth increases from 115 to 140 km. The phase relationship for the basaltic rocks with 5 − 6 wt% bound H 2 O in eclogite facies reveals that the P − T condition observed in this study lies above the solidus temperature. This promotes the formation of interstitial liquid (5 − 10%) at these depths, probably causing high intrinsic attenuation.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Coda wave</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Seismic attenuation</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Andaman Islands</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Andaman-Nicobar subduction zone</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Intrinsic and scattering attenuation</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Biswas, Rahul</subfield><subfield code="0">(orcid)0000-0001-8177-526X</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Singh, Chandrani</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Kumar, M. 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