Abstract
Abstract 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 seismograms is about 0.3 less than that estimated from global data.
Highlights
The double couple force system, which is a combination of two perpendicular force couples, is conventionally considered to describe the earthquake source
The seismic moment has been considered to be a new parameter that specifies the size of an earthquake
1999 Chi-Chi earthquake (Ma et al, 1999), whose epicenter is denoted by a solid star in Fig. 1, cannot be determined by Broadband Array in Taiwan for Seismology (BATS) due to complex regional waveforms caused by complicated source rupture process (Lee et al, 2006)
Summary
The double couple force system, which is a combination of two perpendicular force couples, is conventionally considered to describe the earthquake source. Kao et al (1998) first determined the CMT solutions for larger earthquakes in the Taiwan region from seismograms in the frequency range of 0.02–0.1 Hz (or the period range of 10–50 s) recorded by BATS under the point-source assumption. We have taken the values of Mo listed in both the Global CMT and BATS catalogues and compared these with the aim of assessing the difference between seismic moments determined by global and regional networks, respectively. The results will help us to construct a reliable value of Mo for earthquakes occurring in the Taiwan region (regional Mo) They can be used to evaluate the moment magnitude, Mw. In addition, we compared regional Mw with global Mw. 2. 1999 Chi-Chi earthquake (Ma et al, 1999), whose epicenter is denoted by a solid star in Fig. 1, cannot be determined by BATS due to complex regional waveforms caused by complicated source rupture process (Lee et al, 2006)
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