Techniques and Results of Moment Tensor Inversions using Strong Motion Waveforms of Taiwan TSMIP Data, 1993-2009
Date Issued
2011
Date
2011
Author(s)
Chang, Kai-Wen
Abstract
Deriving earthquake source parameters is important for the purpose of seismic hazard mitigation. Moment tensors are among the most important earthquake source parameters for seismologists, and are now routinely derived using modern broadband seismic networks around the world. However, it is advantageous to apply similar waveform inversion techniques to other available waveforms, including accelograms recorded by strong motion stations. We inverted the source mechanisms of the Taiwan earthquake sequence between 1993 and 2009 by applying the regional moment tensor inversion method using data from the Taiwan Strong Motion Instrumentation Program (TSMIP) accelerograph stations. Through testing different velocity models and filter passbands, we were able to successfully derive moment tensor solutions for 107 MW>= 4.8 earthquakes. The solutions agree well with other available high quality moment tensor catalogs derived with local and global networks. However, for MW= 5.0 or smaller events, we consistently over estimate the moment magnitudes by 0.5 to 1.0. We have tested accelograms, and velocity waveforms integrated from accelograms, for the inversions, and found the results are similar. We use part of the catalogs to study seismogenic structures of Meishan, Taiwan region, and found that it is dominated by complex right-lateral strike-slip fault system. The procedure developed from this study may be applied to other strong motion datasets to compliment or fill the gaps in catalogs from regional broadband networks and teleseismic networks.
Subjects
moment tensor
strong motion
seismogenic structures
Meishan
focal mechanism
Type
thesis
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