Source parameters of the Bhuj earthquake, India of January 26, 2001 from height and gravity changes

Details Source parameters of the Bhuj earthquake, India of January 26, 2001 from height and gravity changes Source parameters of the Bhuj earthquake, India of January 26, 2001 from height and gravity changes

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3119608c&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 19, CiteID L19608

Physics

Geophysics

6

Exploration Geophysics: Gravity Methods, Geodesy And Gravity: Crustal Movements-Intraplate (8110), Geodesy And Gravity: Control Surveys, Geodesy And Gravity: Seismic Deformations (7205), Information Related To Geographic Region: Asia

Scientific paper

Height and gravity measurements observed along a profile across the epicentral area before and after the January 26, 2001, Mw 7.6 Bhuj earthquake show a maximum uplift of 1.57 +/- 0.5 m and a corresponding gravity change of -393 +/- 18 μGal. A best-fit, single-dislocation model inverted from the height-changes using non-linear optimization methods indicates that the high-slip rupture was well contained in the aftershock zone and likely did not break to depths shallower than ~10 km. Source parameters arrived in the present study agree well with those provided by seismic inversions and the distribution of aftershocks. Gravity data over the epicentral area are well modeled by the preferred model; however, a strong influence of shallow hydrological processes is inferred for three sites, two located on the Banni plains, whose mean gravity change ~280 μGal suggests a total mass redistribution of as much as 2.9 Mt.

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