Abstract
The data on the seismicity of the Earth in the first half of 2020 at the level of strong earthquakes with mb6 are presented according to the Earthquake Early Alert Service (EEAS) of the Geo-physical Survey RAS. The review also includes information on weaker but destructive earth-quakes in the world and tangible earthquakes in Russia. In total, 64 earthquakes with mb6 were registered in the first half of the year, including four events in Russia. For 18 strong earthquakes, the EEAS published Informational messages within one or two days after their occurrence, for 16 of them the information on focal mechanisms was given. A comparative analysis of the seismic energy released in the territory of the Globe showed that in the first half of 2020 its amount corresponds to the average values for the last three years. The strongest earthquakes with MS=7.7 occurred on January 28 in the Caribbean Sea and on June 23 in Mexico, accompanied by fore- and aftershocks. The largest human casualties and material damage during the study period were caused by the catastrophic earthquake with MS=6.6 that occurred on January 24 in Turkey. As a result of the earthquake, 41 people died, 1607 were injured. On the territory of Russia, the strongest earthquake with MS=7.5 occurred on March 25 east of the Kuril Islands and was felt in Severo-Kurilsk with an intensity Ii=5–6. A total of 47 tangible earthquakes with mb=3.6–7.2 were recorded in Russia.
Highlights
Параметры механизмов очагов сильных землетрясений Земли за I полугодие 2020 г. по данным Службой срочных донесений (ССД) ФИЦ ЕГС РАН [Информационные сообщения ...]
The data on the seismicity of the Earth in the first half 2020 at the level of strong earthquakes with mb≥6 are presented according to the Earthquake Early Alert Service (EEAS) of the Geophysical Survey RAS
64 earthquakes with mb≥6 were registered in the first half of the year, including four events in Russia
Summary
Исходная информация для анализа сейсмичности получена из БД «Землетрясения» [База данных ...], открытый доступ к которой организован в локальной сети Центрального отделения (ЦО) ФИЦ ЕГС РАН, частичный доступ – на сайте [Информация Службы ...], а также из Информационных сообщений ССД о сильнейших и разрушительных землетрясениях Земли [Информационные сообщения ...]. Соотношение между этими магнитудами по данным БД «Землетрясения» [База данных ...] за 2010–2019 гг. 1, соотношение (1) близко к рекомендованной в [Кондорская и др., 1993] зависимости (2) между магнитудами MLH (аналог MS) и MPVA (аналог m ): b. Поскольку короткопериодная магнитуда по объёмной волне m испытывает насыщение (тенb денцию занижать магнитуду) при mb>6.5, для оценки величины сильных коровых землетрясений желательно использовать магнитуду MS. Для расчёта MSР землетрясений с h≤70 км, при отсутствии инструментального определения MS, использовалась формула (1). Поэтому для землетрясений с h>70 км при расчёте MSР к инструментально определённой MS добавлялась поправка за глубину (dMS=0.556⋅lgh–0.5) [Petrova, Gabsatarova, 2020], а при отсутствии надёжно определённой MS (широкий диапазон эпицентральных расстояний, регистрация не менее чем тремя сейсмическими станциями) использовалась формула (1).
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