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Institute of Earth Sciences, Academia Sinica

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

1. Department of GEological Sciences, Northwestern University, Evanstion, IL 60201, USA
2. Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA
a. Corresponding author address: Dr. Po-Fei Chen, National Centeral University, Taiwan
Chen, P.F., G. Ekstrom., and E. Okal (2004) TAO, Vol.15, No.1, p61-73.
DOI: 10.3319/TAO.2004.15.1.61(T)


We use analog seismograms to invert seventeen new centroid moment tensor solutions for shallow earthquakes in the vicinity of Taiwan during the period 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 Harvard catalog, and if the 1999 Chi-Chi earthquake and its aftershocks are discarded. Significant deviations in geometryare found between some of our solutions and focal mechanisms previously obstained 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.

(key words: Harvard CMT catalog, Taiwan earthquakes, WWSSN)


Map of Taiwan and neighboring areas showing the CMT solutions derived in this study. Events are identified by number and date (MM/DD/YY). The dots symbols represent the inverted centroids, linked by dashes to the reference epicenters (open triangles). Solid triangles are published epicenters for those events with constrained locations.


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