IMAGING COSEISMIC RUPTURE IN FAR FIELD BY SLIP PATCHES

Abstract

Since the end of the 1970s, teleseismic waves are used routinely to infer the first-order characteristics of the event (location, depth, duration, focal mechanism), but finding the second-order kinematic parameters (spatial distribution of slip, rupture velocity and more basically the discrimination between the fault plane and the other nodal plane) of distant events remains a difficult task. Classically, these events are studied by two different methods; either they are seen as a succession of subevents, each of which is considered as a point source, or like in near field, as extended sources where the kinematic parameters are retrieved on a grid. The first approach is not physically satisfactory and can lead to erroneous interpretations.