Dispersive tsunami of the 2010 Chile earthquake recorded by the high-sampling-rate ocean-bottom pressure gauges

Details Dispersive tsunami of the 2010 Chile earthquake recorded by the high-sampling-rate ocean-bottom pressure gauges Dispersive tsunami of the 2010 Chile earthquake recorded by the high-sampling-rate ocean-bottom pressure gauges

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3723303s&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 23, CiteID L23303

Physics

1

Oceanography: Physical: Tsunamis And Storm Surges, Seismology: Earthquake Dynamics (1242), Seismology: Seismic Instruments And Networks (0935, 3025)

Scientific paper

Cabled ocean-bottom pressure gauges deployed offshore Japan recorded the pressure change associated with the 2010 Chile earthquake tsunami over a wider frequency range than that of coastal tide gauges or hydrophones. Although it was difficult to recognize the dispersive features in the original records, the spectrograms clearly showed wave dispersion. A low-frequency tsunami (˜1 mHz) arrived after an elapsed time of 24 hr from the earthquake origin time, while a high-frequency tsunami (˜9 mHz) arrived after an elapsed time of 48 hr. The arrival times can be explained by assuming a constant water depth of 4 km. However, the calculated waveform does not correctly reproduce the number of wave packets appearing in the observations. Cabled ocean-bottom pressure gauges deployed offshore can record broadband tsunami signals reflecting the wide-wavenumber-range spatial spectrum for sea-bottom deformation caused by the earthquake.

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