Coda Q in the Kachchh Basin, Western India Using Aftershocks of the Bhuj Earthquake of January 26, 2001

Gupta, S. C.; Kumar, Ashwani; Shukla, Archana; Suresh, G.; Baidya, P. R.

doi:10.1007/s00024-006-0086-2

Cited by 23 publications

(17 citation statements)

References 16 publications

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“…The Q estimates obtained in the present analysis for the Saurashtra region (Q c = 170f 0.97 for Junagarh; Q c = 224f 0.98 for Jamnagar; lapse time: 30 s) are found to be higher as compared to that of estimated for the Kachchh region (Q c = 102f 0.98 by MANDAL et al, 2004; Q c = 106f 1.11 by GUPTA et al, 2006 and Q c = 148f 1.01 by BABITA et al, 2008). This shows that there is a low level of heterogeneity for the Saurashtra region as compared to that of the adjacent Kachchh region.…”

Section: Resultsmentioning

confidence: 72%

“…The coda-Q estimates of the nearby Kachchh region in the north of the Saurashtra region are available (MANDAL et al, 2004;GUPTA et al, 2006 andBABITA et al, 2008). The Q estimates obtained in the present analysis for the Saurashtra region (Q c = 170f 0.97 for Junagarh; Q c = 224f 0.98 for Jamnagar; lapse time: 30 s) are found to be higher as compared to that of estimated for the Kachchh region (Q c = 102f 0.98 by MANDAL et al, 2004; Q c = 106f 1.11 by GUPTA et al, 2006 and Q c = 148f 1.01 by BABITA et al, 2008).…”

Section: Resultsmentioning

confidence: 99%

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Attenuation of Coda Waves in the Saurashtra Region, Gujarat (India)

Sharma

Kumar

Teotia

et al. 2011

Pure Appl. Geophys.

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The attenuation characteristics based on coda waves of two areas-Jamnagar and Junagarh of Saurashtra, Gujarat (India)-have been investigated in the present study. The frequency dependent relationships have been developed for both the areas using single back scattering model. The broadband waveforms of the vertical components of 33 earthquakes (Mw 1.5-3.5) recorded at six stations of the Jamnagar area, and broadband waveforms of 68 earthquakes (Mw 1.6-5) recorded at five stations of the Junagarh area have been used for the analysis. The estimated relations for the Junagarh area are: Q c = (158 ± 5)f (0.99±0.04) (lapse time : 20 s), Q c = (170 ± 4.4)f (0.97±0.02) (lapse time : 30 s) and Q c = (229 ± 6.6)f (0.94±0.03) (lapse time : 40 s) and for the Jamnagar area are: Q c = (178 ± 3)f (0.95±0.05) (lapse time : 20 s), Q c = (224 ± 6)f (0.98±0.06) (lapse time : 30 s) and Q c = (282 ± 7)f (0.91±0.03) (lapse time : 40 s). These are the first estimates for the areas under consideration.The Junagarh area appears to be more attenuative as compared to the Jamnagar area. The increase in Q c values with lapse time found here for both the areas show the depth dependence of Q c as longer lapse time windows will sample larger area. The rate of decay of attenuation (Q -1 ) with frequency for the relations obtained here is found to be comparable with those of other regions of the world though the absolute values differ. A comparison of the coda-Q estimated for the Saurashtra region with those of the nearby Kachchh region shows that the Saurashtra region is less heterogeneous. The obtained relations are expected to be useful for the estimation of source parameters of the earthquakes in the Saurashtra region of Gujarat where no such relations were available earlier. These relations are also important for the simulation of earthquake strong ground motions in the region.

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Section: Resultsmentioning

confidence: 72%

Section: Resultsmentioning

confidence: 99%

Attenuation of Coda Waves in the Saurashtra Region, Gujarat (India)

Sharma

Kumar

Teotia

et al. 2011

Pure Appl. Geophys.

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“…12). The relation obtained from the present study shows the attenuation characteristics close to the NW Himalayan region (KUMAR et al, 2005) and Kachchh Basin (GUPTA et al, 2006), which are seismically active regions. A further comparison of the present study is made with those estimated for some parts of the world (Fig.…”

Section: Figurementioning

confidence: 93%

“…Workers like AKI (1969), HERRMANN (1980) and MITCHELL (1995) have used different approaches to quantify the attenuation relationship by applying different parts of the seismograms. A significant contribution has been made from seismic wave attenuation studies in India and other parts of the world by different authors using the coda waves from local earthquakes and employing the single backscattering model (HERRMANN, 1980;ROECKER et al, 1982;ROVELLI, 1982;PULLI, 1984;REHA, 1984;HAVSKOV et al, 1989;IBANEZ et al, 1990;PUJADES et al, 1991;WOODGOLD, 1994;AKINCI et al, 1994;HELLWEG et al, 1995;GUPTA et al, 1995GUPTA et al, , 1998GUPTA et al, and 2006AKINCI and EYIDOGAN, 1996;MANDAL and RASTOGI, 1998;SINGH et al, 2001;CASTRO et al, 2002;PAUL et al, 2003;GUPTA and KUMAR, 2002;KUMAR et al, 2005;SHARMA et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Estimation of Coda Wave Attenuation for the National Capital Region, Delhi, India Using Local Earthquakes

Mohanty

Prakash

Suresh

et al. 2009

Pure appl. geophys.

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Attenuation of seismic waves is very essential for the study of earthquake source parameters and also for ground-motion simulations, and this is important for the seismic hazard estimation of a region. The digital data acquired by 16 short-period seismic stations of the Delhi Telemetric Network for 55 earthquakes of magnitude 1.5 to 4.2, which occurred within an epicentral distance of 100 km in an area around Delhi, have been used to estimate the coda attenuation Q c . Using the Single Backscattering Model, the seismograms have been analyzed at 10 central frequencies. The frequency dependence average attenuation relationship Q c = 142f 1.04 has been attained. Four Lapse-Time windows from 20 to 50 seconds duration with a difference of 10 seconds have been analyzed to study the lapse time dependence of Q c . The Q c values show that frequency dependence (exponent n) remains similar at all the lapse time window lengths. While the change in Q 0 values is significant, change in Q 0 with larger lapsetime reflects the rate of homogeneity at the depth. The variation of Q c indicates a definitive trend from west to east in accordance with the geology of the region.

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“…Vol. 169, (2012) Estimation of Coda Wave Attenuation in the East Anatolia Fault Zone 1199 (AKI and CHOUET, 1975;ROECKER et al, 1982;HAVSKOV et al, 1989;IBANEZ et al, 1990;WOODGOLD, 1994;MITCHELL, 1995;GUPTA et al, 1998GUPTA et al, , 2006GIAMPICCOLA et al, 2002;KUMAR et al, 2005;SAHIN, 2008;MITCHELL et al, 2008;SHARMA et al, 2011). MORSY et al (2011 analyzed earthquakes data at different focal depths in the Gulf of Suez, Egypt.…”

Section: Frequency Dependence Of Q Cmentioning

confidence: 99%

Estimation of Coda Wave Attenuation in the East Anatolia Fault Zone, Turkey

Sertçelik

2011

Pure Appl. Geophys.

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In this study, the attenuation of coda waves Q c (f) has been estimated for different lapse times and frequencies in the East Anatolia Fault Zone (EAFZ) in Turkey using a single back-scattering model of S-coda envelopes. The data include 255 earthquakes recorded by ten stations. The frequency-dependent Q c values are estimated at central frequencies of 1.5, 3, 6, 8, 12, and 18 Hz using 20-30-40 s lapse time windows. Along this fault zone, the frequency-dependent Q c obtained for all data and lapse time is Q c = 57.5f 0.82 . The entire study area is divided into six subregions according to the magnitude of the earthquakes and the location of the fault segments. The estimated average frequency-dependent relation for all lapse times are; Q c I ð Þ ¼ 34:3f 0:93 for Bingöl-KarliovaErzincan triple junction; Q c II ð Þ ¼ 56:3f 0:71 for Bingol-Lake Hazar segment; Q c III ð Þ ¼ 68:5f 0:75 for Lake Hazar-Sincik segment; Q c IV ð Þ ¼ 72:5f 0:78 Hazar-Sincik and Ç elikhan-Gölbaşı faults; Q c V ð Þ ¼ 59:7f 0:87 for Kahramanmaras triple junction and Q c VI ð Þ ¼ 67:4f 0:94 for Amanos Range and Karasu Basin. The lowest Q c is determined between Bingol and Malatya. The highest Q c value is along Amanos Range. In addition, Q c values are calculated for each regions at different lapse times. The average Q c value of the study region varies from 53 ± 11 at 1.5 Hz to 498 ± 41 at 18 Hz for 20 s lapse time window, as its variation is from 116 ± 11 at 1.5 Hz to 749 ± 75 at 18 Hz of central frequency for 40 s lapse time window. The increase of Q c with lapse times changes from one subregion to another along the fault zone. The rate of increment is significantly higher in Bingöl-Karliova-Erzincan triple junction than in the other subregions. This rapid increase of low Q c values in the junction reaches the general attenuation characteristics of the fault at 40 s lapse time. Finally, the low Q 0 and high n values can be attributed to the energy loss as a result of the heterogeneity and activity along the fault zone. The increase of Q c with frequency, lapse time may be related to heterogeneity decreases with depth. The rapid increase of Q c with depth in Bingöl-Karliova-Erzincan triple junction may be interpreted that the effect of the Northern Anatolian Fault Zone is effective in the upper crust is not so deep compared to EAFZ.

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Coda Q in the Kachchh Basin, Western India Using Aftershocks of the Bhuj Earthquake of January 26, 2001

Cited by 23 publications

References 16 publications

Attenuation of Coda Waves in the Saurashtra Region, Gujarat (India)

Attenuation of Coda Waves in the Saurashtra Region, Gujarat (India)

Estimation of Coda Wave Attenuation for the National Capital Region, Delhi, India Using Local Earthquakes

Estimation of Coda Wave Attenuation in the East Anatolia Fault Zone, Turkey

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