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Rupture mechanics of complex earthquakes in southern Mexico



Rupture mechanics of complex earthquakes in southern Mexico



Tectonophysics 154(1-2): 25-40



Long-period P waveforms of the three most important events of the sequence of earthquakes which occurred near the coast of Chiapas, Mexico, commencing on April 29, 1970, were analyzed using synthetic seismograms. Some perturbations in the wave forms are shown to be caused by near-source structure, while others are produced by complexities in the earthquake source time functions. The results show that the aftershock of April 30, 1970, at 0833 GMT (M (sub s) = 6.4) is a simple earthquake and consequently can be modelled by a single point source with a seismic moment of 6.6 X 10 (super 25) dyn cm. The foreshock of April 29 at 1122 GMT (M (sub s) = 6.3) consisted of two simple events having approximately the same seismic moment of 4.1 X 10 (super 25) dyn cm. Four events were identified within a 15 second interval prior to the main rupture (M (sub s) = 7.3) for which the seismic moment was 9.9 X 10 (super 26) dyn cm. Rather small fault areas and low rupture velocities seem to be characteristic of these earthquakes.--Modified journal abstract.

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Accession: 018358124

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DOI: 10.1016/0040-1951(88)90226-0


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