Centroid Moment Tensor Solutions for Taiwan Earthquakes of the WWSSN Era (1963-1975)

Abstract

We use analog seismograms to invert seventeen new centroid moment tensor solutins for shallow earthquakes in the vicinity of Taiwan during the perion 1963-1975, with the exact same algorithm used to produce the Harvard catalog for modern events recorded on digital seismographs. The average rate of moment release featured by the 17 events is double that of the modern seismicity of the study area, as expressed in the Havard catalog, and if the 1999 Chi-chi earthquake and its aftershocks are discarded. Significant deviation in geometry are found between some of our solutions and focal mechanisms previously obtained for the same events by a variety of authors. Our study provides a more complete dataset of focal solutions in Taiwan for future analysis of the regional tectonic strain release.

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