Spacio-temporal history of the deep Colombia earthquake of 1970

Details Spacio-temporal history of the deep Colombia earthquake of 1970 Spacio-temporal history of the deep Colombia earthquake of 1970

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977pepi...15....1f&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 15, Issue 1, p. 1-12.

Physics

3

Scientific paper

The deep Colombia earthquake of July 31, 1970, showed a very high multiple-shock activity. The hypocentres of the seven events forming the multiple shock were determined by a relative location method. They cluster on a plane which coincides fairly well with the westerly-dipping nodal plane and show a southwards and upwards migration with time. The hypocentre distribution suggests that the earthquake occurred in the form of shear faulting. The primary P waveforms are computed from the long-period P-wave signals by eliminating the responses of the instrument, crust and mantle. The fault process is inferred from the spacio-temporal relation of the seven events and from the primary P waveforms: the rupture initiated in the lower part of the source region and spread out southwards and upwards. The whole process was almost finished when the intense multiple-shock activity terminated (about 50 s). The mechanism change of this earthquake can be described mainly by the change of the orientation of the fault plane rather than by lip svector change. The strike of the fault plane rotated clockwise about 10° during the events which occurred in the lower part of the source region. The further rotation of about 10° occurred at the subsequent stage. The rupture spread out with a jerk over a curved surface. The difference between the rupture processes in shallow and deep large earthquakes is discussed.

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