Earthquake swarms in the Kamchatka subduction zone and estimation of possible tsunami generation locations |
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| Authors: | G P Avdeiko A A Palueva |
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| Institution: | 1. Institute of Volcanology and Seismology, Far East Branch, Russian Academy of Sciences, bul??var Piipa 9, Petropavlovsk-Kamchatskii, 683006, Russia
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| Abstract: | An analysis of the space-time locations of earthquake swarms in the Kamchatka subduction zone showed that the source zones of these earthquake swarms, as well as of the epicenters of most tsunami-generating earthquakes, are confined to the seamounts in the barrier ridge between Kamchatka and the deep-sea trench. The ??dot clouds?? of hypocenters of practically all earthquake swarms dip toward the trench on seismic sections that are oriented across the subduction zone trend; this fits the auxiliary focal solution of tsunami-generating earthquakes as was first noticed by L.M. Balakina and is in agreement with the model experiment carried out by L.I. Lobkovskii et al. We discuss a likely scenario for the generation of reverse-thrust blocks whose movements are accompanied by earthquake swarms and by tsunami-generating earthquakes. We estimate the locations of the most probable tsunami generation. |
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