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Geophysical Monograph Series

 

Keywords

  • Bhuj earthquake
  • GPS
  • triggered seismicity
  • crustal deformation
  • InSAR
  • viscoelastic process

Index Terms

  • 1734 History of Geophysics: Seismology
  • 1209 Geodesy and Gravity: Tectonic deformation
  • 7209 Seismology: Earthquake dynamics
  • 1240 Geodesy and Gravity: Satellite geodesy: results

Article

GEOPHYSICAL MONOGRAPH SERIES, VOL. 196, PP. 63-73, 2012

Stress Pulse Migration by Viscoelastic Process for Long-Distance Delayed Triggering of Shocks in Gujarat, India, After the 2001 Mw 7.7 Bhuj Earthquake

B. K. Rastogi, P. Choudhury, R. Dumka, K. M. Sreejith, and T. J. Majumdar

About 200 km × 300 km Kachchh region of Gujarat in western India is seismically one of the most active intraplate regions of the world. It has six major E-W trending faults of the failed Mesozoic rift that are being reactivated by thrusting. Kachchh had earlier experienced earthquakes of M7.8 in 1819, M6.3 in 1845, and M6 in 1956 and a small number of M < 6 earthquakes. After the M7.7 earthquake in 2001, besides the continuing high seismicity in the rupture zone of 20 km radius, several other faults within distances of 60 km from the rupture zone and even after 5–8 years of the Bhuj earthquake are activated with earthquakes of M4–5.7 and associated sequences. Moreover, the seismicity to the M3–5 level is triggered along small faults at 20 locations up to 200 km south in the Saurashtra region. The unusually high seismicity along several faults is inferred to be triggered because of a stress pulse migration by viscoelastic processes after a 20 MPa stress drop due to the 2001 Bhuj earthquake.

Citation: Rastogi, B. K., P. Choudhury, R. Dumka, K. M. Sreejith, and T. J. Majumdar (2012), Stress pulse migration by viscoelastic process for long-distance delayed triggering of shocks in Gujarat, India, after the 2001 M w 7.7 Bhuj earthquake, in Extreme Events and Natural Hazards: The Complexity Perspective, Geophys. Monogr. Ser., vol. 196, edited by A. S. Sharma et al. 63–73, AGU, Washington, D. C., doi:10.1029/2011GM001061.

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