Open Access

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

Earth, Planets and Space200860:BF03353118

Received: 20 July 2007

Accepted: 31 December 2007

Published: 4 July 2008


We have taken the seismic moment (Mo) 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. MoG and MoB are used to denote the Mo values published in the Global CMT and regional BATS catalogues, respectively. Our results show that MoB linearly correlates with MoG and that MoB is, on average, approximately equal to 0.37MoG. This difference may be caused by the use of shorter period seismic waves in BATS for estimating MoB. The moment magnitude evaluated from regional BATS seismograms is about 0.3 less than that estimated from global data.

Key words

Seismic moment moment magnitude Taiwan’s earthquakes BATS