Physics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..863i&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 9, p. 863-866.
Physics
21
Earthquakes, Shock Waves, Surface Waves, Tsunami Waves, Crustal Fractures, Seismographs, Waveforms
Scientific paper
The source mechanisms of the Nicaraguan tsunami earthquake of September 2, 1992 is studied via waveforms of body waves and surface waves recorded on global broadband seismographs. The possibility of a single force is ruled out from radiation patterns and the amplitude ratio of Rayleigh and Love waves. The main shock is interpreted as low-angle thrust fault with strike of 302 deg, dip of 16 deg, and slip of 87 deg, the Cocos plate underthrusting beneath the Caribbean plate. The seismic moment from surface wave analysis is 3.0 x 10 exp 20 Nm. The source dimension is estimated to be 200 x 100 km from the aftershock area. The inversion results of body waves suggest bilateral rupture with rupture velocity as low as 1.5 km/s and duration time of about 100 s. The source process time is unusually long, from which it is inferred that the associated crustal deformation has a long time constant.
Abe Katsuyuki
Ide Satoshi
Imamura Fumihiko
Yoshida Yasuhiro
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