Imaging a slow bilateral rupture with broadband seismic waves: The September 2, 1992 Nicaraguan tsunami earthquake

Details Imaging a slow bilateral rupture with broadband seismic waves: The September 2, 1992 Nicaraguan tsunami earthquake Imaging a slow bilateral rupture with broadband seismic waves: The September 2, 1992 Nicaraguan tsunami earthquake

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2629v&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 24, p. 2629-2632

Physics

15

Earthquakes, Nicaragua, Rupturing, Seismic Waves, Seismology, Tsunami Waves, Broadband, Green'S Functions, Surface Waves, Wave Propagation

Scientific paper

The spatio-temporal rupture history of the September 2, 1992 Nicaragua tsunami earthquake (M(sub s) = 7.2,; M(sub w) = 7.6 is analyzed using long-period (157-288 s) Rayleigh and Love wave spectral inversions and an empirical Green function analysis of very broadband (10-250 s) body and surface waves. The event has a rupture duration exceeding 110 s with a slow (0.6-2.3 km/s) rupture velocity, and involves shallow dipping (6 deg-10 deg) thrust faulting at a shallow depth (equal to or less than 10 km), with the latter being primarily responsible for the strong tsunami excitation. Two subevents dominate the source radiation, resulting from a slow asymmetric bilateral, 100-160 im long rupture. Long-period surface wave directivity reveals a predominant rupture azimuth of 140 deg +/- 30 deg consistent with asymmetric extension of the bilateral rupture at an azimuth of 125 deg +/- 30 deg resolved by the source time function analysis. An inverse Radon transform of the source time functions confirms the asymmetric bilateral rupture characteristics.

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