Low‐Magnitude Earthquakes at the Eastern Ultraslow‐Spreading Gakkel Ridge, Arctic Ocean

Morozov, A.N.; Vaganova, N.V.; Antonovskaya, G.N.; Asming, V.E.; Gabsatarova, I.P.; Dyagilev, R.A.; Shakhova, E.V.; Evtyugina, Z.A.

Авторы: Morozov A.N., Vaganova N.V., Antonovskaya G.N., Asming V.E., Gabsatarova I.P., Dyagilev R.A., Shakhova E.V., Evtyugina Z.A.
Журнал: Seismological Research Letters
Том: 92
Номер: 4
Год издания: 2021
Издательство: Seismological Society of America
Местоположение издательства: United States
Первая страница: 2221
Последняя страница: 2233
DOI: 10.1785/0220200308
Аннотация: Thanks to the new permanent seismic stations installed in the Franz Joseph Land and Severnaya Zemlya arctic archipelagoes, it has become possible at present to record earthquakes occurring in the eastern Gakkel Ridge with a much lower detection threshold than that provided by the global network. At present, the lowest recorded magnitude is ML 2.4 and the magnitude of completeness is 3.4. We examined the results of seismic monitoring conducted from December 2016 through January 2020 to show that the earthquake epicenters are not uniformly distributed both in space and over time within the eastern part of the ridge. There were periods of quiescence and seismic activity. Most of the epicenters are confined to the area between 86°E and 95.0°E. Relative location techniques were used to locate the single major swarm of earthquakes recorded so far. Most earthquakes were recorded by two or three stations only so that relative location techniques have been able to yield reliable data for an analysis of the swarm. We showed that there have been actually two swarms that contained different numbers of events. The earthquakes in the larger swarm were occurring nonuniformly over time and clustered at certain depths. The ML scale was calibrated for the Eurasian Arctic based on records of the seismic stations installed in the Svalbard Archipelago, Franz Joseph Land, and on Severnaya Zemlya: -logA_0 (R)=1.5*log R/100+1.0*〖10〗^(-4) (R-100)+3.0. The results will help expand our knowledge of the tectonic and magmatic processes occurring within the ultraslow Gakkel Ridge, which are reflected in the local seismicity.
Добавил в систему: Морозов Алексей Николаевич

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№	Имя	Описание	Имя файла	Размер	Добавлен
1.	Полный текст	Статья	srl-2020308.1.pdf	10,7 МБ	17 февраля 2022 [ArhMAN]
2.	Экспертное заключение		Ekspertnoe_zaklyuchenie_2.pdf	654,7 КБ	14 февраля 2022 [ArhMAN]

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Low‐Magnitude Earthquakes at the Eastern Ultraslow‐Spreading Gakkel Ridge, Arctic Oceanстатья

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