Lapse time and frequency-dependent coda wave attenuation for Delhi and its surrounding regions
Attenuation of seismic wave energy of Delhi and its surrounding regions has been estimated using coda of local earthquakes. Estimated quality factor (Q c ) values are strongly dependent on frequency and lapse time. Frequency dependence of Q c has been estimated from the relationship Q c (f) = Q 0 f...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Das, Rabin [verfasserIn] |
|---|
| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2018transfer abstract |
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| Umfang: |
13 |
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| Übergeordnetes Werk: |
Enthalten in: Pediatric Adrenal Insufficiency - Quality Improvement from Clinic to Community - Borri, Maria ELSEVIER, 2020, international journal of geotectonics and the geology and physics of the interior of the earth, Amsterdam [u.a.] |
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| Übergeordnetes Werk: |
volume:738 ; year:2018 ; day:25 ; month:07 ; pages:51-63 ; extent:13 |
| Links: |
|---|
| DOI / URN: |
10.1016/j.tecto.2018.05.007 |
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ELV043236634 |
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| 245 | 1 | 0 | |a Lapse time and frequency-dependent coda wave attenuation for Delhi and its surrounding regions |
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| 520 | |a Attenuation of seismic wave energy of Delhi and its surrounding regions has been estimated using coda of local earthquakes. Estimated quality factor (Q c ) values are strongly dependent on frequency and lapse time. Frequency dependence of Q c has been estimated from the relationship Q c (f) = Q 0 f n for different lapse time window lengths. Q 0 and n values vary from 73 to 453 and 0.97 to 0.63 for lapse time window lengths of 15 s to 90 s respectively. Average estimated frequency dependent relation is, Q c (f) = 135 ± 8f 0.96±0.02 for the entire region for a window length of 30 s, where the average Q c value varies from 200 at 1.5 Hz to 1962 at 16 Hz. These values show that the region is seismically active and highly heterogeneous. The entire study region is divided into two sub-regions according to the geology of the area to investigate if there is a spatial variation in attenuation characteristics in this region. It is observed that at smaller lapse time both regions have similar Qc values. However, at larger lapse times the rate of increase of Qc with frequency is larger for Region 2 compared to Region 1. This is understandable, as it is closer to the tectonically more active Himalayan ranges and seismically more active compared to Region 1. The difference in variation of Qc with frequencies for the two regions is such that at larger lapse time and higher frequencies Region 2 shows higher Qc compared to Region 1. For lower frequencies the opposite situation is true. This indicates that there is a systematic variation in attenuation characteristics from the south (Region 1) to the north (Region 2) in the deeper part of the study area. This variation can be explained in terms of an increase in heat flow and a decrease in the age of the rocks from south to north. | ||
| 520 | |a Attenuation of seismic wave energy of Delhi and its surrounding regions has been estimated using coda of local earthquakes. Estimated quality factor (Q c ) values are strongly dependent on frequency and lapse time. Frequency dependence of Q c has been estimated from the relationship Q c (f) = Q 0 f n for different lapse time window lengths. Q 0 and n values vary from 73 to 453 and 0.97 to 0.63 for lapse time window lengths of 15 s to 90 s respectively. Average estimated frequency dependent relation is, Q c (f) = 135 ± 8f 0.96±0.02 for the entire region for a window length of 30 s, where the average Q c value varies from 200 at 1.5 Hz to 1962 at 16 Hz. These values show that the region is seismically active and highly heterogeneous. The entire study region is divided into two sub-regions according to the geology of the area to investigate if there is a spatial variation in attenuation characteristics in this region. It is observed that at smaller lapse time both regions have similar Qc values. However, at larger lapse times the rate of increase of Qc with frequency is larger for Region 2 compared to Region 1. This is understandable, as it is closer to the tectonically more active Himalayan ranges and seismically more active compared to Region 1. The difference in variation of Qc with frequencies for the two regions is such that at larger lapse time and higher frequencies Region 2 shows higher Qc compared to Region 1. For lower frequencies the opposite situation is true. This indicates that there is a systematic variation in attenuation characteristics from the south (Region 1) to the north (Region 2) in the deeper part of the study area. This variation can be explained in terms of an increase in heat flow and a decrease in the age of the rocks from south to north. | ||
| 700 | 1 | |a Mukhopadhyay, Sagarika |4 oth | |
| 700 | 1 | |a Singh, Ravi Kant |4 oth | |
| 700 | 1 | |a Baidya, Pushap R. |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n Elsevier |a Borri, Maria ELSEVIER |t Pediatric Adrenal Insufficiency - Quality Improvement from Clinic to Community |d 2020 |d international journal of geotectonics and the geology and physics of the interior of the earth |g Amsterdam [u.a.] |w (DE-627)ELV00416637X |
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10.1016/j.tecto.2018.05.007 doi GBV00000000000245A.pica (DE-627)ELV043236634 (ELSEVIER)S0040-1951(18)30177-X DE-627 ger DE-627 rakwb eng 550 550 DE-600 610 VZ 44.63 bkl Das, Rabin verfasserin aut Lapse time and frequency-dependent coda wave attenuation for Delhi and its surrounding regions 2018transfer abstract 13 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Attenuation of seismic wave energy of Delhi and its surrounding regions has been estimated using coda of local earthquakes. Estimated quality factor (Q c ) values are strongly dependent on frequency and lapse time. Frequency dependence of Q c has been estimated from the relationship Q c (f) = Q 0 f n for different lapse time window lengths. Q 0 and n values vary from 73 to 453 and 0.97 to 0.63 for lapse time window lengths of 15 s to 90 s respectively. Average estimated frequency dependent relation is, Q c (f) = 135 ± 8f 0.96±0.02 for the entire region for a window length of 30 s, where the average Q c value varies from 200 at 1.5 Hz to 1962 at 16 Hz. These values show that the region is seismically active and highly heterogeneous. The entire study region is divided into two sub-regions according to the geology of the area to investigate if there is a spatial variation in attenuation characteristics in this region. It is observed that at smaller lapse time both regions have similar Qc values. However, at larger lapse times the rate of increase of Qc with frequency is larger for Region 2 compared to Region 1. This is understandable, as it is closer to the tectonically more active Himalayan ranges and seismically more active compared to Region 1. The difference in variation of Qc with frequencies for the two regions is such that at larger lapse time and higher frequencies Region 2 shows higher Qc compared to Region 1. For lower frequencies the opposite situation is true. This indicates that there is a systematic variation in attenuation characteristics from the south (Region 1) to the north (Region 2) in the deeper part of the study area. This variation can be explained in terms of an increase in heat flow and a decrease in the age of the rocks from south to north. Attenuation of seismic wave energy of Delhi and its surrounding regions has been estimated using coda of local earthquakes. Estimated quality factor (Q c ) values are strongly dependent on frequency and lapse time. Frequency dependence of Q c has been estimated from the relationship Q c (f) = Q 0 f n for different lapse time window lengths. Q 0 and n values vary from 73 to 453 and 0.97 to 0.63 for lapse time window lengths of 15 s to 90 s respectively. Average estimated frequency dependent relation is, Q c (f) = 135 ± 8f 0.96±0.02 for the entire region for a window length of 30 s, where the average Q c value varies from 200 at 1.5 Hz to 1962 at 16 Hz. These values show that the region is seismically active and highly heterogeneous. The entire study region is divided into two sub-regions according to the geology of the area to investigate if there is a spatial variation in attenuation characteristics in this region. It is observed that at smaller lapse time both regions have similar Qc values. However, at larger lapse times the rate of increase of Qc with frequency is larger for Region 2 compared to Region 1. This is understandable, as it is closer to the tectonically more active Himalayan ranges and seismically more active compared to Region 1. The difference in variation of Qc with frequencies for the two regions is such that at larger lapse time and higher frequencies Region 2 shows higher Qc compared to Region 1. For lower frequencies the opposite situation is true. This indicates that there is a systematic variation in attenuation characteristics from the south (Region 1) to the north (Region 2) in the deeper part of the study area. This variation can be explained in terms of an increase in heat flow and a decrease in the age of the rocks from south to north. Mukhopadhyay, Sagarika oth Singh, Ravi Kant oth Baidya, Pushap R. oth Enthalten in Elsevier Borri, Maria ELSEVIER Pediatric Adrenal Insufficiency - Quality Improvement from Clinic to Community 2020 international journal of geotectonics and the geology and physics of the interior of the earth Amsterdam [u.a.] (DE-627)ELV00416637X volume:738 year:2018 day:25 month:07 pages:51-63 extent:13 https://doi.org/10.1016/j.tecto.2018.05.007 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.63 Krankenpflege VZ AR 738 2018 25 0725 51-63 13 045F 550 |
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10.1016/j.tecto.2018.05.007 doi GBV00000000000245A.pica (DE-627)ELV043236634 (ELSEVIER)S0040-1951(18)30177-X DE-627 ger DE-627 rakwb eng 550 550 DE-600 610 VZ 44.63 bkl Das, Rabin verfasserin aut Lapse time and frequency-dependent coda wave attenuation for Delhi and its surrounding regions 2018transfer abstract 13 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Attenuation of seismic wave energy of Delhi and its surrounding regions has been estimated using coda of local earthquakes. Estimated quality factor (Q c ) values are strongly dependent on frequency and lapse time. Frequency dependence of Q c has been estimated from the relationship Q c (f) = Q 0 f n for different lapse time window lengths. Q 0 and n values vary from 73 to 453 and 0.97 to 0.63 for lapse time window lengths of 15 s to 90 s respectively. Average estimated frequency dependent relation is, Q c (f) = 135 ± 8f 0.96±0.02 for the entire region for a window length of 30 s, where the average Q c value varies from 200 at 1.5 Hz to 1962 at 16 Hz. These values show that the region is seismically active and highly heterogeneous. The entire study region is divided into two sub-regions according to the geology of the area to investigate if there is a spatial variation in attenuation characteristics in this region. It is observed that at smaller lapse time both regions have similar Qc values. However, at larger lapse times the rate of increase of Qc with frequency is larger for Region 2 compared to Region 1. This is understandable, as it is closer to the tectonically more active Himalayan ranges and seismically more active compared to Region 1. The difference in variation of Qc with frequencies for the two regions is such that at larger lapse time and higher frequencies Region 2 shows higher Qc compared to Region 1. For lower frequencies the opposite situation is true. This indicates that there is a systematic variation in attenuation characteristics from the south (Region 1) to the north (Region 2) in the deeper part of the study area. This variation can be explained in terms of an increase in heat flow and a decrease in the age of the rocks from south to north. Attenuation of seismic wave energy of Delhi and its surrounding regions has been estimated using coda of local earthquakes. Estimated quality factor (Q c ) values are strongly dependent on frequency and lapse time. Frequency dependence of Q c has been estimated from the relationship Q c (f) = Q 0 f n for different lapse time window lengths. Q 0 and n values vary from 73 to 453 and 0.97 to 0.63 for lapse time window lengths of 15 s to 90 s respectively. Average estimated frequency dependent relation is, Q c (f) = 135 ± 8f 0.96±0.02 for the entire region for a window length of 30 s, where the average Q c value varies from 200 at 1.5 Hz to 1962 at 16 Hz. These values show that the region is seismically active and highly heterogeneous. The entire study region is divided into two sub-regions according to the geology of the area to investigate if there is a spatial variation in attenuation characteristics in this region. It is observed that at smaller lapse time both regions have similar Qc values. However, at larger lapse times the rate of increase of Qc with frequency is larger for Region 2 compared to Region 1. This is understandable, as it is closer to the tectonically more active Himalayan ranges and seismically more active compared to Region 1. The difference in variation of Qc with frequencies for the two regions is such that at larger lapse time and higher frequencies Region 2 shows higher Qc compared to Region 1. For lower frequencies the opposite situation is true. This indicates that there is a systematic variation in attenuation characteristics from the south (Region 1) to the north (Region 2) in the deeper part of the study area. This variation can be explained in terms of an increase in heat flow and a decrease in the age of the rocks from south to north. Mukhopadhyay, Sagarika oth Singh, Ravi Kant oth Baidya, Pushap R. oth Enthalten in Elsevier Borri, Maria ELSEVIER Pediatric Adrenal Insufficiency - Quality Improvement from Clinic to Community 2020 international journal of geotectonics and the geology and physics of the interior of the earth Amsterdam [u.a.] (DE-627)ELV00416637X volume:738 year:2018 day:25 month:07 pages:51-63 extent:13 https://doi.org/10.1016/j.tecto.2018.05.007 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.63 Krankenpflege VZ AR 738 2018 25 0725 51-63 13 045F 550 |
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10.1016/j.tecto.2018.05.007 doi GBV00000000000245A.pica (DE-627)ELV043236634 (ELSEVIER)S0040-1951(18)30177-X DE-627 ger DE-627 rakwb eng 550 550 DE-600 610 VZ 44.63 bkl Das, Rabin verfasserin aut Lapse time and frequency-dependent coda wave attenuation for Delhi and its surrounding regions 2018transfer abstract 13 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Attenuation of seismic wave energy of Delhi and its surrounding regions has been estimated using coda of local earthquakes. Estimated quality factor (Q c ) values are strongly dependent on frequency and lapse time. Frequency dependence of Q c has been estimated from the relationship Q c (f) = Q 0 f n for different lapse time window lengths. Q 0 and n values vary from 73 to 453 and 0.97 to 0.63 for lapse time window lengths of 15 s to 90 s respectively. Average estimated frequency dependent relation is, Q c (f) = 135 ± 8f 0.96±0.02 for the entire region for a window length of 30 s, where the average Q c value varies from 200 at 1.5 Hz to 1962 at 16 Hz. These values show that the region is seismically active and highly heterogeneous. The entire study region is divided into two sub-regions according to the geology of the area to investigate if there is a spatial variation in attenuation characteristics in this region. It is observed that at smaller lapse time both regions have similar Qc values. However, at larger lapse times the rate of increase of Qc with frequency is larger for Region 2 compared to Region 1. This is understandable, as it is closer to the tectonically more active Himalayan ranges and seismically more active compared to Region 1. The difference in variation of Qc with frequencies for the two regions is such that at larger lapse time and higher frequencies Region 2 shows higher Qc compared to Region 1. For lower frequencies the opposite situation is true. This indicates that there is a systematic variation in attenuation characteristics from the south (Region 1) to the north (Region 2) in the deeper part of the study area. This variation can be explained in terms of an increase in heat flow and a decrease in the age of the rocks from south to north. Attenuation of seismic wave energy of Delhi and its surrounding regions has been estimated using coda of local earthquakes. Estimated quality factor (Q c ) values are strongly dependent on frequency and lapse time. Frequency dependence of Q c has been estimated from the relationship Q c (f) = Q 0 f n for different lapse time window lengths. Q 0 and n values vary from 73 to 453 and 0.97 to 0.63 for lapse time window lengths of 15 s to 90 s respectively. Average estimated frequency dependent relation is, Q c (f) = 135 ± 8f 0.96±0.02 for the entire region for a window length of 30 s, where the average Q c value varies from 200 at 1.5 Hz to 1962 at 16 Hz. These values show that the region is seismically active and highly heterogeneous. The entire study region is divided into two sub-regions according to the geology of the area to investigate if there is a spatial variation in attenuation characteristics in this region. It is observed that at smaller lapse time both regions have similar Qc values. However, at larger lapse times the rate of increase of Qc with frequency is larger for Region 2 compared to Region 1. This is understandable, as it is closer to the tectonically more active Himalayan ranges and seismically more active compared to Region 1. The difference in variation of Qc with frequencies for the two regions is such that at larger lapse time and higher frequencies Region 2 shows higher Qc compared to Region 1. For lower frequencies the opposite situation is true. This indicates that there is a systematic variation in attenuation characteristics from the south (Region 1) to the north (Region 2) in the deeper part of the study area. This variation can be explained in terms of an increase in heat flow and a decrease in the age of the rocks from south to north. Mukhopadhyay, Sagarika oth Singh, Ravi Kant oth Baidya, Pushap R. oth Enthalten in Elsevier Borri, Maria ELSEVIER Pediatric Adrenal Insufficiency - Quality Improvement from Clinic to Community 2020 international journal of geotectonics and the geology and physics of the interior of the earth Amsterdam [u.a.] (DE-627)ELV00416637X volume:738 year:2018 day:25 month:07 pages:51-63 extent:13 https://doi.org/10.1016/j.tecto.2018.05.007 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.63 Krankenpflege VZ AR 738 2018 25 0725 51-63 13 045F 550 |
| allfieldsGer |
10.1016/j.tecto.2018.05.007 doi GBV00000000000245A.pica (DE-627)ELV043236634 (ELSEVIER)S0040-1951(18)30177-X DE-627 ger DE-627 rakwb eng 550 550 DE-600 610 VZ 44.63 bkl Das, Rabin verfasserin aut Lapse time and frequency-dependent coda wave attenuation for Delhi and its surrounding regions 2018transfer abstract 13 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Attenuation of seismic wave energy of Delhi and its surrounding regions has been estimated using coda of local earthquakes. Estimated quality factor (Q c ) values are strongly dependent on frequency and lapse time. Frequency dependence of Q c has been estimated from the relationship Q c (f) = Q 0 f n for different lapse time window lengths. Q 0 and n values vary from 73 to 453 and 0.97 to 0.63 for lapse time window lengths of 15 s to 90 s respectively. Average estimated frequency dependent relation is, Q c (f) = 135 ± 8f 0.96±0.02 for the entire region for a window length of 30 s, where the average Q c value varies from 200 at 1.5 Hz to 1962 at 16 Hz. These values show that the region is seismically active and highly heterogeneous. The entire study region is divided into two sub-regions according to the geology of the area to investigate if there is a spatial variation in attenuation characteristics in this region. It is observed that at smaller lapse time both regions have similar Qc values. However, at larger lapse times the rate of increase of Qc with frequency is larger for Region 2 compared to Region 1. This is understandable, as it is closer to the tectonically more active Himalayan ranges and seismically more active compared to Region 1. The difference in variation of Qc with frequencies for the two regions is such that at larger lapse time and higher frequencies Region 2 shows higher Qc compared to Region 1. For lower frequencies the opposite situation is true. This indicates that there is a systematic variation in attenuation characteristics from the south (Region 1) to the north (Region 2) in the deeper part of the study area. This variation can be explained in terms of an increase in heat flow and a decrease in the age of the rocks from south to north. Attenuation of seismic wave energy of Delhi and its surrounding regions has been estimated using coda of local earthquakes. Estimated quality factor (Q c ) values are strongly dependent on frequency and lapse time. Frequency dependence of Q c has been estimated from the relationship Q c (f) = Q 0 f n for different lapse time window lengths. Q 0 and n values vary from 73 to 453 and 0.97 to 0.63 for lapse time window lengths of 15 s to 90 s respectively. Average estimated frequency dependent relation is, Q c (f) = 135 ± 8f 0.96±0.02 for the entire region for a window length of 30 s, where the average Q c value varies from 200 at 1.5 Hz to 1962 at 16 Hz. These values show that the region is seismically active and highly heterogeneous. The entire study region is divided into two sub-regions according to the geology of the area to investigate if there is a spatial variation in attenuation characteristics in this region. It is observed that at smaller lapse time both regions have similar Qc values. However, at larger lapse times the rate of increase of Qc with frequency is larger for Region 2 compared to Region 1. This is understandable, as it is closer to the tectonically more active Himalayan ranges and seismically more active compared to Region 1. The difference in variation of Qc with frequencies for the two regions is such that at larger lapse time and higher frequencies Region 2 shows higher Qc compared to Region 1. For lower frequencies the opposite situation is true. This indicates that there is a systematic variation in attenuation characteristics from the south (Region 1) to the north (Region 2) in the deeper part of the study area. This variation can be explained in terms of an increase in heat flow and a decrease in the age of the rocks from south to north. Mukhopadhyay, Sagarika oth Singh, Ravi Kant oth Baidya, Pushap R. oth Enthalten in Elsevier Borri, Maria ELSEVIER Pediatric Adrenal Insufficiency - Quality Improvement from Clinic to Community 2020 international journal of geotectonics and the geology and physics of the interior of the earth Amsterdam [u.a.] (DE-627)ELV00416637X volume:738 year:2018 day:25 month:07 pages:51-63 extent:13 https://doi.org/10.1016/j.tecto.2018.05.007 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.63 Krankenpflege VZ AR 738 2018 25 0725 51-63 13 045F 550 |
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10.1016/j.tecto.2018.05.007 doi GBV00000000000245A.pica (DE-627)ELV043236634 (ELSEVIER)S0040-1951(18)30177-X DE-627 ger DE-627 rakwb eng 550 550 DE-600 610 VZ 44.63 bkl Das, Rabin verfasserin aut Lapse time and frequency-dependent coda wave attenuation for Delhi and its surrounding regions 2018transfer abstract 13 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Attenuation of seismic wave energy of Delhi and its surrounding regions has been estimated using coda of local earthquakes. Estimated quality factor (Q c ) values are strongly dependent on frequency and lapse time. Frequency dependence of Q c has been estimated from the relationship Q c (f) = Q 0 f n for different lapse time window lengths. Q 0 and n values vary from 73 to 453 and 0.97 to 0.63 for lapse time window lengths of 15 s to 90 s respectively. Average estimated frequency dependent relation is, Q c (f) = 135 ± 8f 0.96±0.02 for the entire region for a window length of 30 s, where the average Q c value varies from 200 at 1.5 Hz to 1962 at 16 Hz. These values show that the region is seismically active and highly heterogeneous. The entire study region is divided into two sub-regions according to the geology of the area to investigate if there is a spatial variation in attenuation characteristics in this region. It is observed that at smaller lapse time both regions have similar Qc values. However, at larger lapse times the rate of increase of Qc with frequency is larger for Region 2 compared to Region 1. This is understandable, as it is closer to the tectonically more active Himalayan ranges and seismically more active compared to Region 1. The difference in variation of Qc with frequencies for the two regions is such that at larger lapse time and higher frequencies Region 2 shows higher Qc compared to Region 1. For lower frequencies the opposite situation is true. This indicates that there is a systematic variation in attenuation characteristics from the south (Region 1) to the north (Region 2) in the deeper part of the study area. This variation can be explained in terms of an increase in heat flow and a decrease in the age of the rocks from south to north. Attenuation of seismic wave energy of Delhi and its surrounding regions has been estimated using coda of local earthquakes. Estimated quality factor (Q c ) values are strongly dependent on frequency and lapse time. Frequency dependence of Q c has been estimated from the relationship Q c (f) = Q 0 f n for different lapse time window lengths. Q 0 and n values vary from 73 to 453 and 0.97 to 0.63 for lapse time window lengths of 15 s to 90 s respectively. Average estimated frequency dependent relation is, Q c (f) = 135 ± 8f 0.96±0.02 for the entire region for a window length of 30 s, where the average Q c value varies from 200 at 1.5 Hz to 1962 at 16 Hz. These values show that the region is seismically active and highly heterogeneous. The entire study region is divided into two sub-regions according to the geology of the area to investigate if there is a spatial variation in attenuation characteristics in this region. It is observed that at smaller lapse time both regions have similar Qc values. However, at larger lapse times the rate of increase of Qc with frequency is larger for Region 2 compared to Region 1. This is understandable, as it is closer to the tectonically more active Himalayan ranges and seismically more active compared to Region 1. The difference in variation of Qc with frequencies for the two regions is such that at larger lapse time and higher frequencies Region 2 shows higher Qc compared to Region 1. For lower frequencies the opposite situation is true. This indicates that there is a systematic variation in attenuation characteristics from the south (Region 1) to the north (Region 2) in the deeper part of the study area. This variation can be explained in terms of an increase in heat flow and a decrease in the age of the rocks from south to north. Mukhopadhyay, Sagarika oth Singh, Ravi Kant oth Baidya, Pushap R. oth Enthalten in Elsevier Borri, Maria ELSEVIER Pediatric Adrenal Insufficiency - Quality Improvement from Clinic to Community 2020 international journal of geotectonics and the geology and physics of the interior of the earth Amsterdam [u.a.] (DE-627)ELV00416637X volume:738 year:2018 day:25 month:07 pages:51-63 extent:13 https://doi.org/10.1016/j.tecto.2018.05.007 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.63 Krankenpflege VZ AR 738 2018 25 0725 51-63 13 045F 550 |
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Lapse time and frequency-dependent coda wave attenuation for Delhi and its surrounding regions |
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Attenuation of seismic wave energy of Delhi and its surrounding regions has been estimated using coda of local earthquakes. Estimated quality factor (Q c ) values are strongly dependent on frequency and lapse time. Frequency dependence of Q c has been estimated from the relationship Q c (f) = Q 0 f n for different lapse time window lengths. Q 0 and n values vary from 73 to 453 and 0.97 to 0.63 for lapse time window lengths of 15 s to 90 s respectively. Average estimated frequency dependent relation is, Q c (f) = 135 ± 8f 0.96±0.02 for the entire region for a window length of 30 s, where the average Q c value varies from 200 at 1.5 Hz to 1962 at 16 Hz. These values show that the region is seismically active and highly heterogeneous. The entire study region is divided into two sub-regions according to the geology of the area to investigate if there is a spatial variation in attenuation characteristics in this region. It is observed that at smaller lapse time both regions have similar Qc values. However, at larger lapse times the rate of increase of Qc with frequency is larger for Region 2 compared to Region 1. This is understandable, as it is closer to the tectonically more active Himalayan ranges and seismically more active compared to Region 1. The difference in variation of Qc with frequencies for the two regions is such that at larger lapse time and higher frequencies Region 2 shows higher Qc compared to Region 1. For lower frequencies the opposite situation is true. This indicates that there is a systematic variation in attenuation characteristics from the south (Region 1) to the north (Region 2) in the deeper part of the study area. This variation can be explained in terms of an increase in heat flow and a decrease in the age of the rocks from south to north. |
| abstractGer |
Attenuation of seismic wave energy of Delhi and its surrounding regions has been estimated using coda of local earthquakes. Estimated quality factor (Q c ) values are strongly dependent on frequency and lapse time. Frequency dependence of Q c has been estimated from the relationship Q c (f) = Q 0 f n for different lapse time window lengths. Q 0 and n values vary from 73 to 453 and 0.97 to 0.63 for lapse time window lengths of 15 s to 90 s respectively. Average estimated frequency dependent relation is, Q c (f) = 135 ± 8f 0.96±0.02 for the entire region for a window length of 30 s, where the average Q c value varies from 200 at 1.5 Hz to 1962 at 16 Hz. These values show that the region is seismically active and highly heterogeneous. The entire study region is divided into two sub-regions according to the geology of the area to investigate if there is a spatial variation in attenuation characteristics in this region. It is observed that at smaller lapse time both regions have similar Qc values. However, at larger lapse times the rate of increase of Qc with frequency is larger for Region 2 compared to Region 1. This is understandable, as it is closer to the tectonically more active Himalayan ranges and seismically more active compared to Region 1. The difference in variation of Qc with frequencies for the two regions is such that at larger lapse time and higher frequencies Region 2 shows higher Qc compared to Region 1. For lower frequencies the opposite situation is true. This indicates that there is a systematic variation in attenuation characteristics from the south (Region 1) to the north (Region 2) in the deeper part of the study area. This variation can be explained in terms of an increase in heat flow and a decrease in the age of the rocks from south to north. |
| abstract_unstemmed |
Attenuation of seismic wave energy of Delhi and its surrounding regions has been estimated using coda of local earthquakes. Estimated quality factor (Q c ) values are strongly dependent on frequency and lapse time. Frequency dependence of Q c has been estimated from the relationship Q c (f) = Q 0 f n for different lapse time window lengths. Q 0 and n values vary from 73 to 453 and 0.97 to 0.63 for lapse time window lengths of 15 s to 90 s respectively. Average estimated frequency dependent relation is, Q c (f) = 135 ± 8f 0.96±0.02 for the entire region for a window length of 30 s, where the average Q c value varies from 200 at 1.5 Hz to 1962 at 16 Hz. These values show that the region is seismically active and highly heterogeneous. The entire study region is divided into two sub-regions according to the geology of the area to investigate if there is a spatial variation in attenuation characteristics in this region. It is observed that at smaller lapse time both regions have similar Qc values. However, at larger lapse times the rate of increase of Qc with frequency is larger for Region 2 compared to Region 1. This is understandable, as it is closer to the tectonically more active Himalayan ranges and seismically more active compared to Region 1. The difference in variation of Qc with frequencies for the two regions is such that at larger lapse time and higher frequencies Region 2 shows higher Qc compared to Region 1. For lower frequencies the opposite situation is true. This indicates that there is a systematic variation in attenuation characteristics from the south (Region 1) to the north (Region 2) in the deeper part of the study area. This variation can be explained in terms of an increase in heat flow and a decrease in the age of the rocks from south to north. |
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