Seismic wave attenuation at Valle Medio del Magdalena, Colombia

A study of seismic body wave attenuation was carried out for the Valle Medio del Magdalena (VMM) basin, Colombia. A total of 326 high-quality local earthquakes were used to calculate coda Q (Q c ) values, and 1463 high-quality local earthquakes were used to calculate Q scattering (Q s ), Q intrinsic (Q i ), Q total (Q T ), and other attenuation parameters. The average Q c ranged from 47 for 2.0 Hz to 904 for 12 Hz. The average Q-frequency relation (Q c -f) for the VMM basin was Q c = 50 ± 6.4 f 1.1±0.08. Q i , Q s , and Q T ranged from 4, 6, and 2.4 for 2.0 Hz to 420,483, and 224 for 12 Hz, respectively, depending on the region, epicentral distance and depth. Intrinsic absorption was predominant over scattering in the VMM basin at shallow crustal depths, although scattering was also remarkable. Q c value is similar to Q s for low frequencies ( ≤ 2 Hz). For high frequencies ( ≥ 3 Hz), Q c is much higher than Q i , Q s , and Q T , indicating that at low frequencies Q c is reflecting the scattering process occurring at VMM. In addition, it means that single-scattering approach is valid to measure attenuation at VMM for low frequencies but not for high frequencies, where the attenuation is underestimated by using Q c . The spatial distribution of the average Q i , Q s , and Q T shows that, in general, the VMM region has high attenuation at shallow crustal depths, with higher attenuation to the south and north. This high attenuation is possibly due to the presence of oil and water reservoirs as well as the presence of thick sedimentary deposits compared with the surrounding plutonic rocks. The results of this study will be useful for further seismic source, strong motion and seismic hazard studies in the VMM region. Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Londoño, John Makario [verfasserIn] Velásquez, Laura Vanessa [verfasserIn] Bermúdez, Juan Carlos [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2022

Schlagwörter:	Seismic wave attenuation Valle Medio del Magdalena basin Intrinsic attenuation Scattering attenuation Coda Q

Übergeordnetes Werk:	Enthalten in: Journal of South American earth sciences - Amsterdam [u.a.] : Elsevier Science, 1988, 119
Übergeordnetes Werk:	volume:119

DOI / URN:	10.1016/j.jsames.2022.103987

Katalog-ID:	ELV008597545

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520			\|a A study of seismic body wave attenuation was carried out for the Valle Medio del Magdalena (VMM) basin, Colombia. A total of 326 high-quality local earthquakes were used to calculate coda Q (Q c ) values, and 1463 high-quality local earthquakes were used to calculate Q scattering (Q s ), Q intrinsic (Q i ), Q total (Q T ), and other attenuation parameters. The average Q c ranged from 47 for 2.0 Hz to 904 for 12 Hz. The average Q-frequency relation (Q c -f) for the VMM basin was Q c = 50 ± 6.4 f 1.1±0.08. Q i , Q s , and Q T ranged from 4, 6, and 2.4 for 2.0 Hz to 420,483, and 224 for 12 Hz, respectively, depending on the region, epicentral distance and depth. Intrinsic absorption was predominant over scattering in the VMM basin at shallow crustal depths, although scattering was also remarkable. Q c value is similar to Q s for low frequencies ( ≤ 2 Hz). For high frequencies ( ≥ 3 Hz), Q c is much higher than Q i , Q s , and Q T , indicating that at low frequencies Q c is reflecting the scattering process occurring at VMM. In addition, it means that single-scattering approach is valid to measure attenuation at VMM for low frequencies but not for high frequencies, where the attenuation is underestimated by using Q c . The spatial distribution of the average Q i , Q s , and Q T shows that, in general, the VMM region has high attenuation at shallow crustal depths, with higher attenuation to the south and north. This high attenuation is possibly due to the presence of oil and water reservoirs as well as the presence of thick sedimentary deposits compared with the surrounding plutonic rocks. The results of this study will be useful for further seismic source, strong motion and seismic hazard studies in the VMM region.
650		4	\|a Seismic wave attenuation
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650		4	\|a Intrinsic attenuation
650		4	\|a Scattering attenuation
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700	1		\|a Velásquez, Laura Vanessa \|e verfasserin \|4 aut
700	1		\|a Bermúdez, Juan Carlos \|e verfasserin \|4 aut
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allfields	10.1016/j.jsames.2022.103987 doi (DE-627)ELV008597545 (ELSEVIER)S0895-9811(22)00274-7 DE-627 ger DE-627 rda eng 550 DE-600 38.00 bkl 38.70 bkl 38.55 bkl Londoño, John Makario verfasserin aut Seismic wave attenuation at Valle Medio del Magdalena, Colombia 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier A study of seismic body wave attenuation was carried out for the Valle Medio del Magdalena (VMM) basin, Colombia. A total of 326 high-quality local earthquakes were used to calculate coda Q (Q c ) values, and 1463 high-quality local earthquakes were used to calculate Q scattering (Q s ), Q intrinsic (Q i ), Q total (Q T ), and other attenuation parameters. The average Q c ranged from 47 for 2.0 Hz to 904 for 12 Hz. The average Q-frequency relation (Q c -f) for the VMM basin was Q c = 50 ± 6.4 f 1.1±0.08. Q i , Q s , and Q T ranged from 4, 6, and 2.4 for 2.0 Hz to 420,483, and 224 for 12 Hz, respectively, depending on the region, epicentral distance and depth. Intrinsic absorption was predominant over scattering in the VMM basin at shallow crustal depths, although scattering was also remarkable. Q c value is similar to Q s for low frequencies ( ≤ 2 Hz). For high frequencies ( ≥ 3 Hz), Q c is much higher than Q i , Q s , and Q T , indicating that at low frequencies Q c is reflecting the scattering process occurring at VMM. In addition, it means that single-scattering approach is valid to measure attenuation at VMM for low frequencies but not for high frequencies, where the attenuation is underestimated by using Q c . The spatial distribution of the average Q i , Q s , and Q T shows that, in general, the VMM region has high attenuation at shallow crustal depths, with higher attenuation to the south and north. This high attenuation is possibly due to the presence of oil and water reservoirs as well as the presence of thick sedimentary deposits compared with the surrounding plutonic rocks. The results of this study will be useful for further seismic source, strong motion and seismic hazard studies in the VMM region. Seismic wave attenuation Valle Medio del Magdalena basin Intrinsic attenuation Scattering attenuation Coda Q Velásquez, Laura Vanessa verfasserin aut Bermúdez, Juan Carlos verfasserin aut Enthalten in Journal of South American earth sciences Amsterdam [u.a.] : Elsevier Science, 1988 119 Online-Ressource (DE-627)303393106 (DE-600)1494875-8 (DE-576)09680646X 0895-9811 nnns volume:119 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OPC-GGO SSG-OPC-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_2004 GBV_ILN_2005 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2034 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2064 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2113 GBV_ILN_2143 GBV_ILN_2153 GBV_ILN_2336 GBV_ILN_4037 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4313 GBV_ILN_4326 GBV_ILN_4334 GBV_ILN_4338 38.00 Geowissenschaften: Allgemeines 38.70 Geophysik: Allgemeines 38.55 Regionale Geologie AR 119
spelling	10.1016/j.jsames.2022.103987 doi (DE-627)ELV008597545 (ELSEVIER)S0895-9811(22)00274-7 DE-627 ger DE-627 rda eng 550 DE-600 38.00 bkl 38.70 bkl 38.55 bkl Londoño, John Makario verfasserin aut Seismic wave attenuation at Valle Medio del Magdalena, Colombia 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier A study of seismic body wave attenuation was carried out for the Valle Medio del Magdalena (VMM) basin, Colombia. A total of 326 high-quality local earthquakes were used to calculate coda Q (Q c ) values, and 1463 high-quality local earthquakes were used to calculate Q scattering (Q s ), Q intrinsic (Q i ), Q total (Q T ), and other attenuation parameters. The average Q c ranged from 47 for 2.0 Hz to 904 for 12 Hz. The average Q-frequency relation (Q c -f) for the VMM basin was Q c = 50 ± 6.4 f 1.1±0.08. Q i , Q s , and Q T ranged from 4, 6, and 2.4 for 2.0 Hz to 420,483, and 224 for 12 Hz, respectively, depending on the region, epicentral distance and depth. Intrinsic absorption was predominant over scattering in the VMM basin at shallow crustal depths, although scattering was also remarkable. Q c value is similar to Q s for low frequencies ( ≤ 2 Hz). For high frequencies ( ≥ 3 Hz), Q c is much higher than Q i , Q s , and Q T , indicating that at low frequencies Q c is reflecting the scattering process occurring at VMM. In addition, it means that single-scattering approach is valid to measure attenuation at VMM for low frequencies but not for high frequencies, where the attenuation is underestimated by using Q c . The spatial distribution of the average Q i , Q s , and Q T shows that, in general, the VMM region has high attenuation at shallow crustal depths, with higher attenuation to the south and north. This high attenuation is possibly due to the presence of oil and water reservoirs as well as the presence of thick sedimentary deposits compared with the surrounding plutonic rocks. The results of this study will be useful for further seismic source, strong motion and seismic hazard studies in the VMM region. Seismic wave attenuation Valle Medio del Magdalena basin Intrinsic attenuation Scattering attenuation Coda Q Velásquez, Laura Vanessa verfasserin aut Bermúdez, Juan Carlos verfasserin aut Enthalten in Journal of South American earth sciences Amsterdam [u.a.] : Elsevier Science, 1988 119 Online-Ressource (DE-627)303393106 (DE-600)1494875-8 (DE-576)09680646X 0895-9811 nnns volume:119 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OPC-GGO SSG-OPC-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_2004 GBV_ILN_2005 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2034 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2064 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2113 GBV_ILN_2143 GBV_ILN_2153 GBV_ILN_2336 GBV_ILN_4037 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4313 GBV_ILN_4326 GBV_ILN_4334 GBV_ILN_4338 38.00 Geowissenschaften: Allgemeines 38.70 Geophysik: Allgemeines 38.55 Regionale Geologie AR 119
allfields_unstemmed	10.1016/j.jsames.2022.103987 doi (DE-627)ELV008597545 (ELSEVIER)S0895-9811(22)00274-7 DE-627 ger DE-627 rda eng 550 DE-600 38.00 bkl 38.70 bkl 38.55 bkl Londoño, John Makario verfasserin aut Seismic wave attenuation at Valle Medio del Magdalena, Colombia 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier A study of seismic body wave attenuation was carried out for the Valle Medio del Magdalena (VMM) basin, Colombia. A total of 326 high-quality local earthquakes were used to calculate coda Q (Q c ) values, and 1463 high-quality local earthquakes were used to calculate Q scattering (Q s ), Q intrinsic (Q i ), Q total (Q T ), and other attenuation parameters. The average Q c ranged from 47 for 2.0 Hz to 904 for 12 Hz. The average Q-frequency relation (Q c -f) for the VMM basin was Q c = 50 ± 6.4 f 1.1±0.08. Q i , Q s , and Q T ranged from 4, 6, and 2.4 for 2.0 Hz to 420,483, and 224 for 12 Hz, respectively, depending on the region, epicentral distance and depth. Intrinsic absorption was predominant over scattering in the VMM basin at shallow crustal depths, although scattering was also remarkable. Q c value is similar to Q s for low frequencies ( ≤ 2 Hz). For high frequencies ( ≥ 3 Hz), Q c is much higher than Q i , Q s , and Q T , indicating that at low frequencies Q c is reflecting the scattering process occurring at VMM. In addition, it means that single-scattering approach is valid to measure attenuation at VMM for low frequencies but not for high frequencies, where the attenuation is underestimated by using Q c . The spatial distribution of the average Q i , Q s , and Q T shows that, in general, the VMM region has high attenuation at shallow crustal depths, with higher attenuation to the south and north. This high attenuation is possibly due to the presence of oil and water reservoirs as well as the presence of thick sedimentary deposits compared with the surrounding plutonic rocks. The results of this study will be useful for further seismic source, strong motion and seismic hazard studies in the VMM region. Seismic wave attenuation Valle Medio del Magdalena basin Intrinsic attenuation Scattering attenuation Coda Q Velásquez, Laura Vanessa verfasserin aut Bermúdez, Juan Carlos verfasserin aut Enthalten in Journal of South American earth sciences Amsterdam [u.a.] : Elsevier Science, 1988 119 Online-Ressource (DE-627)303393106 (DE-600)1494875-8 (DE-576)09680646X 0895-9811 nnns volume:119 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OPC-GGO SSG-OPC-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_2004 GBV_ILN_2005 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2034 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2064 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2113 GBV_ILN_2143 GBV_ILN_2153 GBV_ILN_2336 GBV_ILN_4037 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4313 GBV_ILN_4326 GBV_ILN_4334 GBV_ILN_4338 38.00 Geowissenschaften: Allgemeines 38.70 Geophysik: Allgemeines 38.55 Regionale Geologie AR 119
allfieldsGer	10.1016/j.jsames.2022.103987 doi (DE-627)ELV008597545 (ELSEVIER)S0895-9811(22)00274-7 DE-627 ger DE-627 rda eng 550 DE-600 38.00 bkl 38.70 bkl 38.55 bkl Londoño, John Makario verfasserin aut Seismic wave attenuation at Valle Medio del Magdalena, Colombia 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier A study of seismic body wave attenuation was carried out for the Valle Medio del Magdalena (VMM) basin, Colombia. A total of 326 high-quality local earthquakes were used to calculate coda Q (Q c ) values, and 1463 high-quality local earthquakes were used to calculate Q scattering (Q s ), Q intrinsic (Q i ), Q total (Q T ), and other attenuation parameters. The average Q c ranged from 47 for 2.0 Hz to 904 for 12 Hz. The average Q-frequency relation (Q c -f) for the VMM basin was Q c = 50 ± 6.4 f 1.1±0.08. Q i , Q s , and Q T ranged from 4, 6, and 2.4 for 2.0 Hz to 420,483, and 224 for 12 Hz, respectively, depending on the region, epicentral distance and depth. Intrinsic absorption was predominant over scattering in the VMM basin at shallow crustal depths, although scattering was also remarkable. Q c value is similar to Q s for low frequencies ( ≤ 2 Hz). For high frequencies ( ≥ 3 Hz), Q c is much higher than Q i , Q s , and Q T , indicating that at low frequencies Q c is reflecting the scattering process occurring at VMM. In addition, it means that single-scattering approach is valid to measure attenuation at VMM for low frequencies but not for high frequencies, where the attenuation is underestimated by using Q c . The spatial distribution of the average Q i , Q s , and Q T shows that, in general, the VMM region has high attenuation at shallow crustal depths, with higher attenuation to the south and north. This high attenuation is possibly due to the presence of oil and water reservoirs as well as the presence of thick sedimentary deposits compared with the surrounding plutonic rocks. The results of this study will be useful for further seismic source, strong motion and seismic hazard studies in the VMM region. Seismic wave attenuation Valle Medio del Magdalena basin Intrinsic attenuation Scattering attenuation Coda Q Velásquez, Laura Vanessa verfasserin aut Bermúdez, Juan Carlos verfasserin aut Enthalten in Journal of South American earth sciences Amsterdam [u.a.] : Elsevier Science, 1988 119 Online-Ressource (DE-627)303393106 (DE-600)1494875-8 (DE-576)09680646X 0895-9811 nnns volume:119 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OPC-GGO SSG-OPC-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_2004 GBV_ILN_2005 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2034 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2064 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2113 GBV_ILN_2143 GBV_ILN_2153 GBV_ILN_2336 GBV_ILN_4037 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4313 GBV_ILN_4326 GBV_ILN_4334 GBV_ILN_4338 38.00 Geowissenschaften: Allgemeines 38.70 Geophysik: Allgemeines 38.55 Regionale Geologie AR 119
allfieldsSound	10.1016/j.jsames.2022.103987 doi (DE-627)ELV008597545 (ELSEVIER)S0895-9811(22)00274-7 DE-627 ger DE-627 rda eng 550 DE-600 38.00 bkl 38.70 bkl 38.55 bkl Londoño, John Makario verfasserin aut Seismic wave attenuation at Valle Medio del Magdalena, Colombia 2022 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier A study of seismic body wave attenuation was carried out for the Valle Medio del Magdalena (VMM) basin, Colombia. A total of 326 high-quality local earthquakes were used to calculate coda Q (Q c ) values, and 1463 high-quality local earthquakes were used to calculate Q scattering (Q s ), Q intrinsic (Q i ), Q total (Q T ), and other attenuation parameters. The average Q c ranged from 47 for 2.0 Hz to 904 for 12 Hz. The average Q-frequency relation (Q c -f) for the VMM basin was Q c = 50 ± 6.4 f 1.1±0.08. Q i , Q s , and Q T ranged from 4, 6, and 2.4 for 2.0 Hz to 420,483, and 224 for 12 Hz, respectively, depending on the region, epicentral distance and depth. Intrinsic absorption was predominant over scattering in the VMM basin at shallow crustal depths, although scattering was also remarkable. Q c value is similar to Q s for low frequencies ( ≤ 2 Hz). For high frequencies ( ≥ 3 Hz), Q c is much higher than Q i , Q s , and Q T , indicating that at low frequencies Q c is reflecting the scattering process occurring at VMM. In addition, it means that single-scattering approach is valid to measure attenuation at VMM for low frequencies but not for high frequencies, where the attenuation is underestimated by using Q c . The spatial distribution of the average Q i , Q s , and Q T shows that, in general, the VMM region has high attenuation at shallow crustal depths, with higher attenuation to the south and north. This high attenuation is possibly due to the presence of oil and water reservoirs as well as the presence of thick sedimentary deposits compared with the surrounding plutonic rocks. The results of this study will be useful for further seismic source, strong motion and seismic hazard studies in the VMM region. Seismic wave attenuation Valle Medio del Magdalena basin Intrinsic attenuation Scattering attenuation Coda Q Velásquez, Laura Vanessa verfasserin aut Bermúdez, Juan Carlos verfasserin aut Enthalten in Journal of South American earth sciences Amsterdam [u.a.] : Elsevier Science, 1988 119 Online-Ressource (DE-627)303393106 (DE-600)1494875-8 (DE-576)09680646X 0895-9811 nnns volume:119 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OPC-GGO SSG-OPC-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_2004 GBV_ILN_2005 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2034 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2064 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2113 GBV_ILN_2143 GBV_ILN_2153 GBV_ILN_2336 GBV_ILN_4037 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4313 GBV_ILN_4326 GBV_ILN_4334 GBV_ILN_4338 38.00 Geowissenschaften: Allgemeines 38.70 Geophysik: Allgemeines 38.55 Regionale Geologie AR 119
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author	Londoño, John Makario
spellingShingle	Londoño, John Makario ddc 550 bkl 38.00 bkl 38.70 bkl 38.55 misc Seismic wave attenuation misc Valle Medio del Magdalena basin misc Intrinsic attenuation misc Scattering attenuation misc Coda Q Seismic wave attenuation at Valle Medio del Magdalena, Colombia
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topic_title	550 DE-600 38.00 bkl 38.70 bkl 38.55 bkl Seismic wave attenuation at Valle Medio del Magdalena, Colombia Seismic wave attenuation Valle Medio del Magdalena basin Intrinsic attenuation Scattering attenuation Coda Q
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title	Seismic wave attenuation at Valle Medio del Magdalena, Colombia
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title_full	Seismic wave attenuation at Valle Medio del Magdalena, Colombia
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title_sort	seismic wave attenuation at valle medio del magdalena, colombia
title_auth	Seismic wave attenuation at Valle Medio del Magdalena, Colombia
abstract	A study of seismic body wave attenuation was carried out for the Valle Medio del Magdalena (VMM) basin, Colombia. A total of 326 high-quality local earthquakes were used to calculate coda Q (Q c ) values, and 1463 high-quality local earthquakes were used to calculate Q scattering (Q s ), Q intrinsic (Q i ), Q total (Q T ), and other attenuation parameters. The average Q c ranged from 47 for 2.0 Hz to 904 for 12 Hz. The average Q-frequency relation (Q c -f) for the VMM basin was Q c = 50 ± 6.4 f 1.1±0.08. Q i , Q s , and Q T ranged from 4, 6, and 2.4 for 2.0 Hz to 420,483, and 224 for 12 Hz, respectively, depending on the region, epicentral distance and depth. Intrinsic absorption was predominant over scattering in the VMM basin at shallow crustal depths, although scattering was also remarkable. Q c value is similar to Q s for low frequencies ( ≤ 2 Hz). For high frequencies ( ≥ 3 Hz), Q c is much higher than Q i , Q s , and Q T , indicating that at low frequencies Q c is reflecting the scattering process occurring at VMM. In addition, it means that single-scattering approach is valid to measure attenuation at VMM for low frequencies but not for high frequencies, where the attenuation is underestimated by using Q c . The spatial distribution of the average Q i , Q s , and Q T shows that, in general, the VMM region has high attenuation at shallow crustal depths, with higher attenuation to the south and north. This high attenuation is possibly due to the presence of oil and water reservoirs as well as the presence of thick sedimentary deposits compared with the surrounding plutonic rocks. The results of this study will be useful for further seismic source, strong motion and seismic hazard studies in the VMM region.
abstractGer	A study of seismic body wave attenuation was carried out for the Valle Medio del Magdalena (VMM) basin, Colombia. A total of 326 high-quality local earthquakes were used to calculate coda Q (Q c ) values, and 1463 high-quality local earthquakes were used to calculate Q scattering (Q s ), Q intrinsic (Q i ), Q total (Q T ), and other attenuation parameters. The average Q c ranged from 47 for 2.0 Hz to 904 for 12 Hz. The average Q-frequency relation (Q c -f) for the VMM basin was Q c = 50 ± 6.4 f 1.1±0.08. Q i , Q s , and Q T ranged from 4, 6, and 2.4 for 2.0 Hz to 420,483, and 224 for 12 Hz, respectively, depending on the region, epicentral distance and depth. Intrinsic absorption was predominant over scattering in the VMM basin at shallow crustal depths, although scattering was also remarkable. Q c value is similar to Q s for low frequencies ( ≤ 2 Hz). For high frequencies ( ≥ 3 Hz), Q c is much higher than Q i , Q s , and Q T , indicating that at low frequencies Q c is reflecting the scattering process occurring at VMM. In addition, it means that single-scattering approach is valid to measure attenuation at VMM for low frequencies but not for high frequencies, where the attenuation is underestimated by using Q c . The spatial distribution of the average Q i , Q s , and Q T shows that, in general, the VMM region has high attenuation at shallow crustal depths, with higher attenuation to the south and north. This high attenuation is possibly due to the presence of oil and water reservoirs as well as the presence of thick sedimentary deposits compared with the surrounding plutonic rocks. The results of this study will be useful for further seismic source, strong motion and seismic hazard studies in the VMM region.
abstract_unstemmed	A study of seismic body wave attenuation was carried out for the Valle Medio del Magdalena (VMM) basin, Colombia. A total of 326 high-quality local earthquakes were used to calculate coda Q (Q c ) values, and 1463 high-quality local earthquakes were used to calculate Q scattering (Q s ), Q intrinsic (Q i ), Q total (Q T ), and other attenuation parameters. The average Q c ranged from 47 for 2.0 Hz to 904 for 12 Hz. The average Q-frequency relation (Q c -f) for the VMM basin was Q c = 50 ± 6.4 f 1.1±0.08. Q i , Q s , and Q T ranged from 4, 6, and 2.4 for 2.0 Hz to 420,483, and 224 for 12 Hz, respectively, depending on the region, epicentral distance and depth. Intrinsic absorption was predominant over scattering in the VMM basin at shallow crustal depths, although scattering was also remarkable. Q c value is similar to Q s for low frequencies ( ≤ 2 Hz). For high frequencies ( ≥ 3 Hz), Q c is much higher than Q i , Q s , and Q T , indicating that at low frequencies Q c is reflecting the scattering process occurring at VMM. In addition, it means that single-scattering approach is valid to measure attenuation at VMM for low frequencies but not for high frequencies, where the attenuation is underestimated by using Q c . The spatial distribution of the average Q i , Q s , and Q T shows that, in general, the VMM region has high attenuation at shallow crustal depths, with higher attenuation to the south and north. This high attenuation is possibly due to the presence of oil and water reservoirs as well as the presence of thick sedimentary deposits compared with the surrounding plutonic rocks. The results of this study will be useful for further seismic source, strong motion and seismic hazard studies in the VMM region.
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title_short	Seismic wave attenuation at Valle Medio del Magdalena, Colombia
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author2	Velásquez, Laura Vanessa Bermúdez, Juan Carlos
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A total of 326 high-quality local earthquakes were used to calculate coda Q (Q c ) values, and 1463 high-quality local earthquakes were used to calculate Q scattering (Q s ), Q intrinsic (Q i ), Q total (Q T ), and other attenuation parameters. The average Q c ranged from 47 for 2.0 Hz to 904 for 12 Hz. The average Q-frequency relation (Q c -f) for the VMM basin was Q c = 50 ± 6.4 f 1.1±0.08. Q i , Q s , and Q T ranged from 4, 6, and 2.4 for 2.0 Hz to 420,483, and 224 for 12 Hz, respectively, depending on the region, epicentral distance and depth. Intrinsic absorption was predominant over scattering in the VMM basin at shallow crustal depths, although scattering was also remarkable. Q c value is similar to Q s for low frequencies ( ≤ 2 Hz). For high frequencies ( ≥ 3 Hz), Q c is much higher than Q i , Q s , and Q T , indicating that at low frequencies Q c is reflecting the scattering process occurring at VMM. In addition, it means that single-scattering approach is valid to measure attenuation at VMM for low frequencies but not for high frequencies, where the attenuation is underestimated by using Q c . The spatial distribution of the average Q i , Q s , and Q T shows that, in general, the VMM region has high attenuation at shallow crustal depths, with higher attenuation to the south and north. This high attenuation is possibly due to the presence of oil and water reservoirs as well as the presence of thick sedimentary deposits compared with the surrounding plutonic rocks. The results of this study will be useful for further seismic source, strong motion and seismic hazard studies in the VMM region.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Seismic wave attenuation</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Valle Medio del Magdalena basin</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Intrinsic attenuation</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Scattering attenuation</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Coda Q</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Velásquez, Laura Vanessa</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Bermúdez, Juan Carlos</subfield><subfield code="e">verfasserin</subfield><subfield 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Seismic wave attenuation at Valle Medio del Magdalena, Colombia

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