First detection of absolute gravity change caused by earthquake

Details First detection of absolute gravity change caused by earthquake First detection of absolute gravity change caused by earthquake

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2979t&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 15, p. 2979-2982

Physics

6

Geodesy And Gravity: Crustal Movements-Intraplate, Geodesy And Gravity: Seismic Deformations, Seismology: Earthquake Dynamics And Mechanics

Scientific paper

Unequivocal coseismic gravity change was detected for the first time by absolute gravimetry. The measurements were done just one day before and only 7 days after a M6.1 earthquake (M6.1). The absolute gravity change was -6 microgal, significantly larger than the observational error of about 1 microgal. Of particular interest is that the observed spatial gravity variations agree remarkably well with those expected from an elastic dislocation model constructed on displacement data alone. The result strongly encourages us to perform a simultaneous inversion of both gravity and displacements to have better insight of earthquakes.

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