The information on the Earth seismicity in 2013 at the level of strong earthquakes with M≥6 is provided according to the Seismological Bulletin of the Geophysical Survey of RAS (GS RAS). The initial Seismo-logical Bulletin for 2013 contains parameters of 4212 earthquakes in the world, versus 4845 in 2012. This article analyzes parameters of 160 strong earthquakes of the Earth in 2013 with M≥6, including 24 strongest earthquakes with M≥7 and the maximum earthquake of the Earth with Mw8.3 occurred in Okhotsk Sea, as well as four earthquakes with M6.0–6.8, which resulted in significant sacrifices and destructions. The location of earthquake epicenters and seismic stations, whose data were used to deter-mine the main parameters of earthquake foci, are shown, as well as a comparative analysis of the number of earthquakes and seismic energy released within the Earth's seismic regions is given. The information on focal mechanisms and consequences of 28 strongest earthquakes, including macroseismic effect, number of victims, landslides, tsunamis, etc. is given. The epicenters of most of them are confined to the boundaries of the largest tectonic plates of the Earth, and their focal mechanisms correspond to the basic laws of plate movement. The hypocenters of most of the strongest earthquakes are located within the Earth's crust, with the exception of earthquakes in Colombia, the Kuril Islands and south of the Fiji Is-lands, which had intermediate depths (h=98–171 km), and the strongest in 2013 Okhotsk earthquake, the source of which lay in the upper mantle at the depth of h=617 km. The movement in the source of the Okhotsk earthquake corresponds to the subduction process of the Pacific plate under the continent and indicates that the subducted plate is at the depth of 617 km.
The information on global seismicity in 2014 at the level of strong earthquakes with M≥6 according to the Seismological Bulletin of the Geophysical Survey of RAS (GS RAS) is provided. The original Seismological Bulletin for 2014 contains parameters of 3268 earthquakes in the world, versus 4212 in 2013. This article analyzes 165 earthquakes with M≥6, including 16 strongest earthquakes with M≥7, and five earthquakes with M6.0–6.7, which resulted in significant casualties and destruction. The information on focal mechanisms, macroseismic effect, the number of victims, tsunamis, etc. is given. A comparative analysis of the number of earthquakes and released seismic energy in different seismically active regions of the Earth showed that, as before, the Pacific region was the most seismically active. More than 96 % of common seismic energy was re-leased in the Pacific region, compared to 1.8 % in Eurasia, 1.3 % in Atlantic Ocean and 0.2 % in the Indian Ocean. The Earth’s maximum earthquake in 2014 occurred on April 1 with Mw=8.1 off shore of Chile. It was accompanied by numerous foreshocks and aftershocks. The maximum casualties and material damage in 2014 were caused by the catastrophic Ludian earthquake that occurred on August 3 with MS=6.2 in the Chinese province of Yunnan.
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