Moment tensor inversion for the focal mechanism of the Dongfang (Hainan) earthquake swarm

Moment tensor inversion for the focal mechanism of the 12 earthquakes of the Dongfang (Hainan) earthquakeswarm occurred from June to August 1992 with near-source broadband data recorded by a temporal small-aperturenetwork consisting of DCS-302 digital three-component accelerographs. The results inverted indicate that thepredominant components of sources of all these 12 earthqualles were shear dislocations. The principal pressureaxis and the principal tension axis are in NW-SE direction and in NE-SW direction, respectively, and their dips arealmost horizontal. It could infer that these earthquakes occurred within the same ambient stress field.