Source characteristics of the Kunashiri strait earthquake of December 6, 1978 as deduced from strain seismograms

Details Source characteristics of the Kunashiri strait earthquake of December 6, 1978 as deduced from strain seismograms Source characteristics of the Kunashiri strait earthquake of December 6, 1978 as deduced from strain seismograms

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...37..124k&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 37, Issue 2-3, p. 124-134.

Physics

6

Scientific paper

A great intermediate-depth earthquake (MJMA = 7.7) occurred on December 6, 1978 beneath the Kunashiri strait in the southern part of the Kurile arc. Strain seismograms recorded by the three components of a fused-quartz extensometer at the Erimo Geophysical Observatory are used to study the source process of this earthquake. The seismograms show a notable sequence of pulses with a short-period of several seconds. The sequence follows the first P-wave arrival and lasts for ~ 60 s after the first S-wave arrival. Furthermore, a long-period (~ 60 s) wave arriving at the first P time appears on each seismogram. From the short-period pulse sequence, at least 18 distinct events which have a total seismic moment of 2.5 × 1027 dyne . cm can be identified during ~ 60 s by comparing the synthetic seismograms to the observed ones. However, the amplitude of the observed long-period wave cannot be explained enough by the sequence of short-period events. From this fact it may be concluded that this earthquake contains, in addition to short-period events, a main long-period event with a source process time (rupture time) of ~ 60 s and a seismic moment of 4.5 × 1027 dyne . cm. The observed strain steps, in both magnitude and shape, are also explained well by the complex multiple shock sequence.

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