Relocation of aftershocks of the 2001 Bhuj earthquake: A new insight into seismotectonics of the Kachchh seismic zone, Gujarat, India

Mandal, Prantik; Pandey, O.P.

doi:10.1016/j.jog.2010.01.005

Cited by 61 publications

(24 citation statements)

References 41 publications

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“…2c). This change in seismogenic change could be attributed to the lateral variation in maficness across the main rupture zone (Mandal and Pandey 2010).…”

Section: Location Delineation and Characterization Of The Causative mentioning

confidence: 99%

Evidence for non-self-similarity in the M w 7.7 2001 Bhuj earthquake sequence

et al. 2014

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Scaled energy, apparent stress, seismic moments, stress drops and corner frequencies are measured through the Levenberg-Marquardt nonlinear inversion modeling of S-wave displacement spectra for 489 selected earthquakes (M w 2.05-5.52) from the 2001 M w 7.7 Bhuj earthquake sequence. The iterative inversion scheme is formulated based on the x-square source spectral model, which enabled us to estimate stable source parameters. The estimated seismic moment (M o ) and source radius (r) vary from 1.5 9 10 12 to 2.4 9 10 17 to N m and 139.1-933.9 m, respectively, while estimated stress drops (Dr) and the multiplicative factor (E mo ) values range from 0.1 to 14.4 MPa and 1.0-4.1, respectively. The corner frequencies (f c ) are found to be ranging from 1.4 to 9.3 Hz. The mean standard deviation for f c , r and Dr are estimated to be 0.7 Hz, 91.4 m and 2.9 MPa, respectively. The radiated seismic energy and apparent stresses range from 2.1 9 10 5 to 4.1 9 10 13 Joule and 0.005-8.0 MPa, respectively. Our estimated corner frequencies and seismic moments satisfy the relation M o ? f c -(3?e) , where e (measure for a deviation from self-similarity) is found to be 1.33 for the larger earthquakes (M o C 2 9 10 15 N m), while the parameter e is estimated to be 6.74 for smaller earthquakes (M o \ 2 9 10 15 N m). We feel that the larger value of e may require to satisfy the increasing trend of scaled energy with moment for smaller earthquakes. We also notice that stress drops increase with seismic moment, approximately as Mo 3 (DrµM o 3 ) for smaller events (M o \ 10 15.3 N m), while for larger earthquakes (M o C 2 9 10 15 N m) stress drop increases approximately with M o 1 (DrµM o 1 ). Adding credence to this non-self-similar theory, our estimated seismic moments and source radii (r) also reveal a break in the linear self-similar source scaling at M o = 2 9 10 15 N m and r = 300 m, which is attributed to constant source radius for smaller earthquakes. Further, a comparative study between apparent stresses and static stress drops suggests a probable frictional overshoot mechanism for larger earthquakes, while smaller shocks are showing both partial stress drop and frictional overshoot Electronic supplementary material The online version of this article (mechanisms. We hypothesize that larger events are probably subject to the regional stateof-stress and fluid flow in the fault zone, whereas smaller earthquakes are sensitive to the local state-of-stress associated with material heterogeneities and fluid flows within the fault zone. We also propose that the relations developed in this study could be useful for accessing proper seismic hazard in the region.

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“…2c). This change in seismogenic change could be attributed to the lateral variation in maficness across the main rupture zone (Mandal and Pandey 2010).…”

Section: Location Delineation and Characterization Of The Causative mentioning

confidence: 99%

Evidence for non-self-similarity in the M w 7.7 2001 Bhuj earthquake sequence

et al. 2014

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“…Articles authored by Adger et al (2009);Barenstein and Iyengar (2010);de Sherbinin et al (2011);Dixit (1994); Lasgorceix and Kothari (2009a); P Mandal and Horton (2007); Prantik Mandal and Pandey (2010); Mascarenhas and Jayakumar (2008) discussed technical aspects of post-disaster approaches and didn't comment on the changes that took place between livelihoods, social networks and settlements of affected people-before and after resettlement process (Ahmed & McEvoy, 2014).…”

Section: Appendix 7 : Literature Review On Disaster and Climate-impacmentioning

confidence: 99%

Risk-related resettlement and relocation in urban areas: A Diagnostic for India

Jain¹,

Amir²,

Rohit³

et al. 2016

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“…Mandal and Pandey (2010) made an attempt to prepare a strength envelope for the Kachchh region using GNStress software version 2.16 (Robinson, 2005). This model had used a two-layered thin (34 km) crust with high heat flow (60 mW/m 2 ) and weak upper mantle, and reported brittle-ductile transitions at 4 and 34 km depths, but another such transition beyond 20 km depth shown in the strength envelope was not reported (Mandal and Pandey, 2010). Another feature of the strength envelope prepared by Mandal and Pandey (2010) is of a very low differential stress value (maximum 150 MPa).…”

Section: Proposed Model For the Seismicity Of The Kachchh Basinmentioning

confidence: 99%