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 data on the seismicity of the Earth in the second half of 2020 at the level of strong earthquakes with magnitudes mb≥6.0 are given according to the data of the Alert Service of the Geophysical Survey RAS. The review also includes information on 54 tangible earthquakes in Russia and five earthquakes in adjacent territories that were felt in the settlements of the Russian Federation. Two of 67 strong earthquakes of the Earth with mb≥6.0 for the period under consideration were registered in the territory of Russia. For 15 strong earthquakes, the Alert Service published Information Messages within one or two days after their occurrence, for 14 earthquakes the information on focal mechanisms is provided. The strongest earthquake of the Earth with MS=7.9 occurred on July, 22 in the region of the Alaska Peninsula. The maximum human casualties and material damage during the study period were the result of the catastrophic intraplate earthquake with MS=6.8, which occurred on October, 30 in the Aegean Sea, near the Samos Island. As a result of the earthquake, 117 people died, 1054 were injured. The strongest earthquake on the territory of Russia was the deep-focus one with mb=6.4, which took place on November, 30 in the Tatar Strait, separating Sakhalin Island from continental Eurasia. The crustal Bystrinsk earthquake on September, 21 with MS=5.2, which occurred in the area of Lake Baikal, was felt with a maximum intensity I=6–7 on the territory of Russia. Comparative analysis of the rate of seismic energy released in the Globe in 2010-2020 showed that its value in the second half of 2020, as well as for 2019-2020 on average, is one of the lowest for the eleven-year period and indicates a seismic calm, which should be replaced by a period of intensification of global seismic and deformation processes
Data on the 2021 first half Earth seismicity at the level of strong earthquakes with magni-tudes mb6.0 according to the Alert Service of the Geophysical Survey RAS are given. The review also includes information on 81 earthquakes in Russia and adjacent territories, felt in the settlements of the Russian Federation. For 14 strong earthquakes, within one or two days after their occurrence, Informational messages were published, and information about the focal mechanisms was giving. The strongest earthquake of the Earth with MS=7.8 (Mw=8.1) occurred on March 4 at the Kermadec Islands, New Zealand. The largest human casualties and material damage during the study period were caused by catastrophic earth-quakes with MS=5.1 (Mw=5.8) and MS=5.9 (Mw=6.3), which occurred on January 14 at the Sulawesi Island, Indonesia. As a result of the earthquakes, 81 people died, 826 were injured. The strongest earthquake in Russia was the March 16 earthquake with MS=6.7 (Mw=6.6) off the eastern coast of Kamchatka. The maximum shaking intensity in Russia (I=6) was manifested by the strong Khuvsgul earthquake with MS=7.2 (Mw=6.8), which took place on January 11 in the Northern Mongolia, near the border with Russia. The position of the main shock and its aftershocks indicate the intensification of the seismic process in the north-western part of the Khuvsgul rift zone. According to the focal mechanisms of the main shock and two strong aftershocks, the stress of the northwest/southeast extension prevails in this zone, and the predominant slip type along the faults of the northeast strike is a nor-mal fault. The global seismic energy released in the 2021 first half remains, as in the previ-ous two years, at a reduced level, relative to the average for the last 11.5 years, which indi-cates a continuing seismic calm.
An analysis of the seismicity of the Earth in the 2021 second half at the level of strong earthquakes with magnitudes mb≥6.0 according to the Alert Service of the Geophysical Survey RAS are given. Alsoadded information about 59 earthquakes in Russia and adjacent territories, felt in the settlements of the Russian Federation. For 26 strong earthquakes within one or two days after their occurrence, Information messages were publishing; information about the focal mechanisms was calculated and presented. During the period under review, there were two strongest earthquakes on the globe with MS=8.0 (Mw=8.2) and with MS=7.8 (Mw=8.3) occurred, respectively, on July 29 off the coast of Alaska and on August 12 in the area of the South Sandwich Islands. The largest loss of life and material damage during the study period was caused by a catastrophic earthquake with MS=7.3 (Mw=7.2) that occurred on August 14 in the southwest of Haiti. As a result of the earthquake, 2248 people were killed, more than 12 thousand people were injured, 329 people were missing. The strongest earthquake in Russia was on September 20 with MS=5.9 (Mw=6.2) east of the Kuril Islands. The highest intensity of shaking in Russia (5 points) was caused by earthquakes with mb=4.9 that occurred on October 20 in the Chechen Republic and on December 15 in the water area of Lake Baikal. The global seismic energy released in the 2021 second half remains, as in the previous two years, at a reduced level, relative to the average for the last 11.5 years, which indicates a continuing seismic calm.
An analysis of the seismicity of the Earth in the 2022 first half at the level of strong earthquakes with magnitudes mb≥6.0 according to the Alert Service of the Geophysical Survey RAS are given. In addition, added information about 59 earthquakes in Russia and adjacent territories, felt in the settlements of the Russian Federation. For 15 strong earthquakes within one or two days after their occurrence, Information messages were publishing; information about the focal mechanisms was calculated and presented. During the period under review, the strongest earthquake on the globe with MS=7.0 (Mw=7.3) occurred on March 16 on the east coast of Honshu Island, Japan. The greatest loss of life and material damage during the study period was caused by a catastrophic earthquake with MS=6.4 (Mw=6.1), which occurred on June 21 on the border of Afghanistan and Pakistan. Because of the earthquake, 1,500 people were killing and more than 2,000 people were injured. On the territory of Russia, the strongest earthquake was on April 24 with MS=5.8 (Mw=6.2) east of the Kuril Islands. With the greatest intensity of concussions (6 points) in the settlements of Russia, an earthquake was felt on June 8 with mb=5.4 (MS=5.2), which occurred in the water area of Lake Baikal. There was a sharp decrease in the seismic energy released in the first half of 2022 on the globe after a surge in the previous six months.
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