Peculiarities of the Earth’s Free Oscillations after the Sea of Okhotsk Deep-Focus Earthquake of May 24, 2013
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A description of the initial excitation of spheroidal mode 0S2 initiated by the 2013 Sea of Okhotsk earthquake (Mw = 8.3) is presented. It is based on the newly revealed fact of the origination of a standing P-wave in the epicenter of the Sea of Okhotsk earthquake and excitation of the traveling surface P-waves on the Earth’s surface by this wave. A new interpretation of the nature of the Earth’s free spheroidal oscillations in the case of a strong earthquake (M ≥ 7.5) is proposed. The spheroidal mode 0S2 is interpreted as a combination of standing and traveling P-waves, transferring the energy of Earth’s deformations.
This work is implemented in the framework of the State Contract, project no. 0149-2019-0005, for the Shirshov Institute of Oceanology, Russian Academy of Sciences.
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