Abstract
Two large earthquakes (Q1 and Q2) occurred off the eastern coast of Mindanao along the Philippine Trench on May 1992. During these events, the southeastern coasts of the island experienced one strong ground shaking and suffered from one set of tsunamis waves. To investigate this phenomenon, teleseismic body wave inversions and tsunami waveform analysis were undertaken for the quakes. Correlation of simulation results and field observations show that Q1 was the most probable source of the damaging tsunami wave. Results also imply that the relation between the Q1 and Q2 that may have ruptured the southern and northern portion of the one‐day aftershock area, respectively. Furthermore, closer examination of the Philippine trench indicates the presence of a bend in between the events that could have prevented the Q1 to rupture in just one big event.
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