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Contemporary motions of the Earth crust in the North Eurasia and stability of the regional reference framesтезисы доклада
- Автор: Steblov G.M.
- Сборник: Abstracts Book APSG-2015 (24-28 August 2015, Moscow, Russia)
- Тезисы
- Год издания: 2015
- Место издания: INASAN Moscow
- Первая страница: 18
- Аннотация: A number of mobile tectonic belts cross the Northern part of Eurasia that should be accounted in implementation of any regional geodetic reference frames in the vicinity of such belts. The Pacific coast of Eurasia is one of the most seismically active areas where three major lithospheric plates interact: Eurasian, North American and Pacific. Another seismically active area is Caucasus where the crustal motion is determined by the drift of Arabian plate towards Eurasia. Co-seismic crustal surface offsets during strong interplate subduction earthquakes may reach meters in horizontal direction and may affect thousands kilometers away from the source, while rapidly decaying with the distance. Moreover such earthquakes are often accompanied by long lasting post-seismic motions, which significantly change interseismic velocities, observed before the earthquake, thus disturbing reference frame realization. While co-seismic offsets are unpredictable, they do not affect the velocities of the reference sites. To the contrary, the postseismic motions significantly change the interseismic velocities but may be well modeled given the co-seismic shifts are known. Continuous observations in seismically active regions of East Eurasia (Kamchatka, Kurils) confirmed the validity of the existing postseismic motion models for long-term prediction of anomalous velocities of the reference sites.
- Добавил в систему: Стеблов Григорий Михайлович