Abstract

Satellite gravity (GRACE Satellite) have helped infer near surface fluid exchanges and budgets on a global scale. However, isolating weak gravity signatures due to major earthquakes from satellite gravity is a difficult task as other time-varying fluid exchange signals mask them. Our differential data analysis (Spherical harmonics) attended by spectral filtering has successfully isolated weak gravity signals for three major earthquakes. For illustration purpose we include Sumatra earthquake. Our isolated gravity signals could easily identify the rupture zone in the source region. Both prediction of earthquake occurrence and seismological and gravity modeling of satellite gravity derived gravity signals are underway. These efforts if successful could be a huge step in predicting earthquakes.