The 14 November 1986 Taiwan earthquake - an event with isotropic component

  • Zheng T
  • Yao Z
  • Liu P
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Investigating the possibility that some earthquakes may significantly differ from the double-couple mechanism is always a subject of concern to seismologists. In this paper we give a detailed study of the 14 November 1986 Taiwan earthquake (Ms= 7.8) using the long-period body-wave waveform inversion. A hybrid global inversion method was used to derive the best-fitting solution and estimate the extreme models of non-double-couple components. The regional P-waveforms provide high resolution to the isotropic component. The inversion result shows that the Taiwan earthquake is an event composed of the reverse dip-slip dislocation source and an isotropic component. A notable source parameter in the result is the relative intensity of the isotropic component, which is defined as SP= (σ1+ σ2+ σ3) 3M0, where σ1, σ2and σ3are the eigenvalues of the seismic moment tensor with σ1> σ2> σ3and M0= (σ1- σ3) 2. The best-fitting solution of SPis -0.33, and the extreme values of SPare -0.48 and -0.13, respectively. This result suggests the existence of an obvious compressional isotropic component at the source process of this event. © 1995.

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