Estimate of the tsunami source of the 1992 Nicaraguan earthquake from tsunami data

Details Estimate of the tsunami source of the 1992 Nicaraguan earthquake from tsunami data Estimate of the tsunami source of the 1992 Nicaraguan earthquake from tsunami data

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1515i&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 14, p. 1515-1518.

Physics

21

Earthquakes, Seismic Waves, Tsunami Waves, Coasts, Nicaragua, Seismic Energy

Scientific paper

The Nicaraguan earthquake of September 2, 1992 excited large tsunamis which caused significant damage along the Nicaraguan coasts. Some of the inhabitants felt only minimal shock before the tsunami arrived, indicating that excitation of short-period seismic waves was very small. Numerical simulation with the initial tsunami source estimated by the seismic data is carried out to study the characteristics of the tsunami source by comparing the calculated data with the measured data along the Nicaraguan coast. Finding of the comparison shows that the dislocation of the fault estimated from the measured data is 5.6 to 10.0 times larger than that from seismic data. The tsunami source area, which is 200 km in length x l00 km in width, is used to explain the distribution of measured tsunami heights along the coast and the wave period as shown in the tide record at Corinto. The effect of rise time on tsunami excitation indicates a slow process, which corresponds with the seismic waves. This event falls under the tsunami earthquake category to produce anomalously large tsunamis relative to earthquake magnitude.

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