Resumen del producto

The great tsunami generated by the Tohoku (East Japan) earthquake of 11 March 2011 (M_w 9.0) caused catastrophic damage and loss of life in Japan and was recorded throughout the Pacific Ocean. This tsunami was recorded along the entire Mexican Pacific coast by tide gauges and offshore DART (Deep-ocean Assessment and Reporting of Tsunamis) stations. Statistical and spectral analyses of these records enabled us to estimate the principal parameters of the waves along the coast and to compare statistical features of the tsunami with other tsunamis recorded on this coast. Based on these analyses, we identified coastal “hot spots”, corresponding to sites having maximum tsunami risk, where wave heights exceeded 1.5-2 m and tsunami-induced currents were strong enough to close port operations. Based on joint spectral analyses of the tsunamis and background noise, we reconstructed the spectra of tsunami waves in the deep ocean and found that they were in close agreement with the “true” tsunami spectra evaluated from DART records. The energy of the Tohoku tsunami derived from the total open-ocean tsunami energy and frequency content of the individual events was compared with the corresponding results from the Chilean tsunami of 2010.

Palabras clave: Tohoku tsunami; sea level; spectral analysis; Mexican coast

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