Abstract
Based on the analysis of different seismological data on the Sea of Okhotsk, two of the fullest catalogs of shallow-focus earthquakes are made for the historical (1735–2010; M ≥ 5.0) and instrumental (1962–2010; M ≥ 4.0) periods. The peculiarities of the lateral and depth distributions of seismicity are considered, and earthquake recurrence on three shelf zones of the Sea of Okhotsk is estimated. Maps of earthquake hypocenters are compared with the Moho depth scheme. With the data of seismic continuous profiling (SCP) and common depth point studies (CDP) taken into account, the probable relationship between the tectonic nature of seismicity in the Sea of Okhotsk and the mobility and allochthonous occurrence of the crust (divergent glide on the Okhotsk Swell, regional thrusts along the island arc margins, subsidence of the Kuril Basin’s bottom) is examined.
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