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The largest instrumentally recorded regional back-arc earthquake with MW = 7.8, MC = 8.2 occurred on July 17, 2017 on the Bering transform fault (the boundary between the Beringia minor lithospheric plate and the Komandorskii (Commander) block of the Aleutian island arc). This seismic event, called the Near Islands earthquake or Near Islands Aleutian earthquake, caused the ground to shake with intensity I = 5–6 on Bering Island and a small tsunami wave on the Near Islands. The specific aspects of the peculiarities of the pattern of seismicity of the northwestern segment of the Aleutian arc and the tectonic position of the Near Island Aleutian earthquake, the details of its prompt processing, macroseismic manifestations, analysis results of ground motion peak amplitudes, focal mechanisms, and earthquake source models are discussed. The coseismic displacements according to the GNSS data are presented. It is concluded that the source of the Near Islands Aleutian earthquake did not fill the seismic gap near the Commander Islands, and the possibility of the strongest earthquake hitting the northwestern part of the Aleutian arc remains. [ABSTRACT FROM AUTHOR]

A deep-focus magnitude M 8.3 earthquake occurred off the Kamchatka Peninsula on May 24, 2013. This was named the 'Sea-of-Okhotsk' event. The earthquake has attracted special attention because, among other issues, it was felt uncommonly far from the epicenter, to distances of nearly 10000 km. The present paper reports its felt effects for the area around the epicenter and worldwide. We quote peak acceleration values at many stations in Kamchatka and worldwide as derived from instrumental recordings at digital seismograph stations in the Russian Far East and from those due to the Global Seismographic Network (GSN). We discuss features that are present in the instrumental records of the Sea-of-Okhotsk earthquake. [ABSTRACT FROM AUTHOR]