Earthquake source-parameter estimation using regional waveforms: Implications for tsunami alerting in the Caribbean

Details Earthquake source-parameter estimation using regional waveforms: Implications for tsunami alerting in the Caribbean Earthquake source-parameter estimation using regional waveforms: Implications for tsunami alerting in the Caribbean

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3224314m&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 24, CiteID L24314

Physics

Geophysics

1

Mathematical Geophysics: Time Series Analysis (1872, 4277, 4475), Oceanography: Physical: Tsunamis And Storm Surges, Seismology: Earthquake Source Observations (1240)

Scientific paper

Three-component seismic waveforms recorded at the single broadband station SJG have been examined for four MW >= 6 Caribbean earthquakes using a regional moment-tensor (RMT) inversion procedure that uses a general crustal velocity model to generate synthetic Green's functions at a fixed depth. Comparisons of the computed source parameters with solutions reported by international agencies indicate that the RMT procedure provides a rapid estimate of the earthquake magnitude using a single station. Focal mechanisms are not as well resolved and may require a more complete azimuthal coverage. The inversion procedure thus provides a timely estimate of the earthquake magnitude that would be useful for tsunami alerting. Warning intervals for the Caribbean region would vary from about 12 minutes for a tsunami generated at a distance of 200 km to more than 60 minutes for a tsunami originating at a distance of 800 km from the recording site.

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