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Stress Change Pattern and their Relation with Orientation of Fault
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 78th EAGE Conference and Exhibition 2016, May 2016, Volume 2016, p.1 - 3
Abstract
Focal mechanism data for earthquakes shows a large variation in the orientation of fault, we examine how the azimuth of fault result in different stress accumulation also, the contrast in coulomb stress after the event and yearly change have been calculated. Depending on the change in stress values we could comment on the likelihood of the events in the near future. We first consider components of strain tensor values calculated from strain meter then, by using the stress- strain relationship for the isotropic medium we calculated stress using two Lame parameter values which are in turn computed using P-velocity, S-velocity, and density of the medium. The stress calculated is resolved onto the fault of particular orientation; coulomb stress has been calculated for different orientation of fault and its variation in seen. Change of coulomb stress after the event is found to be large as compared to yearly change, in a broad sense future events on the faults having azimuth between 20 to 120 degrees are advanced due to large change in coulomb stress, similarly, faults which have been sober in past and having azimuth between 60 to 120 degrees have small probability for occurrence of event