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

Inversion was made using teleseismic data (provided by IRIS-DMC)

We retrieved teleseismic body waves (P-waves and S-waves) data recorded at IRIS-dmc stations via Internet. 18 stations were used in the waveform inversion. We examined two fault models :(strike, dip, rake) = (78, 58, 81), (276, 33, 105) which is inferred from Teleseismic body wave analysis (EIC Seismological Note)

Result(new)

We re-examined the depth of hypocenter, and found that 18 km is better.

Fault model 1 (strike, dip, rake) = (78, 58, 81)

Variance = (obs-cal)**2/obs**2 = 0.12690

Fault model 2 (strike, dip, rake) = (276, 33, 105)

Variance = (obs-cal)**2/obs**2 = 0.12653

Result

Fault model 1 (strike, dip, rake) = (78, 58, 81)

Variance = (obs-cal)**2/obs**2 = 0.12919

Fault model 2 (strike, dip, rake) = (276, 33, 105)

Variance = (obs-cal)**2/obs**2 = 0.12738

The difference of variances for two fault models is too small to judge which is an actual fault plane. We need near-field data.

If you have questions, please send to yuji@eri.u-tokyo.ac.jp or kikuchi@eri.u-tokyo.ac.jp.

Last Updated: March 9, 2001