Results of Rupture Process for January 26, 2001 Western India Earthquake (Ms 7.9) (Revised on March 9, 2001)


The seismic moment Mo = 2.8 x 10**20 Nm (Mw 7.6);
The source duration T = 20 s;
Fault mechanism: (Strike, Dip, Slip)=(78, 58, 81) :(Fix) ;
Hypocenter: (lat.= 23.4N, lon.= 70.32E, depth= 18 km).

The source process is characterized by a unilateral rupture propagation. The rupture mainly propagated 40 km to the west. The maximum dislocation is about 7.5 m.

(Yagi and Kikuchi, 2001)

Distribution of fault-slip

Fig. : (upper left) Focal mechanism; (upper middle) Total moment-rate function; (lower) Distribution of coseismic slip. Star indicates the location of the initial break.

Snapshot of fault-slip

Fig. : Snapshots of the interval dislocation.

Map View

Fig. : Map view of slip distribution. Hypocenter of the main-shock determined by USGS. Blue lines represent the extent of the fault plane used in our inversion.

Waveform comparison

Fig. : Comparison of the observed waveform (Black) with the calculated waveform (Red). The numbers below the station code indicate maximum amplitude in microns. The start time of the traces is lined-up at 10 (s) before the P- arrival.

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Last Updated: March 9, 2001