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Moderate-magnitude seismicity remotely triggered in the Taiwan region by large earthquakes around the Philippine Sea plate

Institute of Earth Sciences Academia Sinica, P.O. Box 1-55, Nankang Taipei,, Taiwan 11529 R.O.C.
Department of Earth Sciences Carleton University, 304 Tory Building, 1125 Colonel By Drive, Ottawa, K1S 5B6 Canada

Abstract

Seismicity in the Taiwan region was studied before and after the 12 largest seismic events with body-wave magnitudes exceeding 6.5, occurring around the Philippine Sea plate in the 1973 to 1994 period. The total local seismicity rate involving events with magnitudes as small as 2.0 was not affected by remote large events. However, the number of local earthquakes with magnitude M_L 4.5 in the 15 days following a large event exceeded the number before it in 9 out of 12 cases studied. When earthquakes with M_L 4.0 were considered, then 10 cases showed an increase in seismic activity after the big event. This suggests a 75 to 83% probability of remote triggering.

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