The 2001 Bhuj earthquake: Tomographic evidence for fluids at the hypocenter and its implications for rupture nucleation

Details The 2001 Bhuj earthquake: Tomographic evidence for fluids at the hypocenter and its implications for rupture nucleation The 2001 Bhuj earthquake: Tomographic evidence for fluids at the hypocenter and its implications for rupture nucleation

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29x...5k&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 24, pp. 5-1, CiteID 2152, DOI 10.1029/2002GL015177

Astronomy and Astrophysics

Astrophysics

8

Seismology: Earthquake Dynamics And Mechanics, Seismology: Continental Crust (1242), Seismology: Seismic Hazard Assessment And Prediction, Seismology: Seismicity And Seismotectonics, Radio Science: Tomography And Imaging

Scientific paper

The January 26, 2001 Bhuj earthquake (Mw 7.6) is one of the most catastrophic Indian earthquakes. We have investigated the 3-D seismic velocity and Poisson's ratio structures of the Bhuj source area to understand the probable cause of triggering the earthquake. We used 1948 P and 1865 S-wave high-quality arrival times from 331 aftershocks recorded at a temporary seismic network. Significant variations up to 5% in velocity and 10% in Poisson's ratio are revealed in the aftershock area. The mainshock is located in a distinctive zone characterized by high-Vp, low-Vs and high Poisson's ratio (σ) in the depth range of 20 to 30 km and extending 15 to 30 km laterally. This feature is very similar to that of the 1995 Kobe earthquake [Zhao et al., 1996]. The anomaly may be due to a fluid-filled, fractured rock matrix, which might have contributed to the initiation of the Bhuj earthquake.

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