Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pepi...18..167k&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 18, Issue 3, p. 167-175.
Physics
12
Scientific paper
Anomalous earthquakes such as creep events, tsunami earthquakes and silent earthquakes have been reported in the recent literature. In this paper we discuss an anomalous ``slow earthquake'' that occurred on June 6, 1960 in southern Chile. Although the surface-wave magnitude of this event is only 6.9, it excited anomalously large long-period multiple surface waves with a seismic moment of 5.6 . 1027 dyn cm. The Benioff long-period seismogram of this earthquake recorded at Pasadena shows an extremely long, about 1.5-2 h coda of Rayleigh waves, with a period of 10-25 s. The coda length for other events with a comparable magnitude which occurred in the same region is about 10 min. This observation suggests that the long coda length is due to a long source rupture process which lasted at least 1 h. Although at least 15 distinct events can be identified in the coda, no short-period body waves were recorded corresponding to these, except for the first one. These results suggest that a relatively small (Ms ≅ 6.9) earthquake triggered a series of slow events; the duration of the whole sequence being longer than 1 h. This event probably occurred on a transform fault on the extension of the Chile Rise and provides important information regarding the nature of the transform fault.
Kanamori Hiroo
Stewart Gordon S.
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