Seismic moments of Taiwan's earthquakes evaluated from a regional broadband array

摘要

We have taken the seismic moment (M-o) values of 79 earthquakes occurring in the Taiwan region that have been published in the Global centroid-moment tensor (CMT) and regional Broadband Array in Taiwan for Seismology (BATS) catalogues for the period 1996-2005 and compared the values determined from the global and regional networks, respectively. M-oG and M-oB are used to denote the M-o values published in the Global CMT and regional BATS catalogues, respectively. Our results show that M-oB linearly correlates with M-oG and that M-oB is, on average, approximately equal to 0.37M(oG). This difference may be caused by the use of shorter period seismic waves in BATS for estimating M-oB. The moment magnitude evaluated from regional BATS seismogramis is about 0.3 less than that estimated from global data.