Tomographic Images of Magma Chambers Beneath the Avacha and Koryaksky Volcanoes in Kamchatka


статья в журнале
Авторы: Bushenkova N.   (ИНГГ СО РАН)   Koulakov I.   (ИНГГ СО РАН)   Senyukov S.     Gordeev E.I.     Huang H.H.     El Khrepy S.     Al Arifi N.    
дата публикации: 2019
реферат:
A new tomographic model (Vp, Vs, and Vp/Vs ratio) was built for two neighboring active volcanoes, Avacha and Koryaksky, which represent a serious hazard to the population and infrastructure of Petropavlovsk-Kamchatsky, the main city of Kamchatka, Russia. Arrival times of seismic P and S waves from almost 5,000 local events, recorded by a permanent network of seismic stations during 2009-2018, were used for tomography. The resolution of the derived models was carefully tested by a series of synthetic simulations. Prominent anomalies with extremely high Vp/Vs ratios (up to 2.4) were retrieved directly beneath both volcanoes and interpreted as magma reservoirs containing high degrees of partial melt and/or fluids. Beneath Avacha, the upper limit of the anomaly is located at the depth of ~2 km below the surface. The reservoir appears to be connected to the surface by a neck-shaped anomaly of high Vp/Vs ratio associated with active seismicity, which is interpreted as a magma and fluid conduit. Beneath Koryaksky, the magma related anomaly is deeper: Its upper limit is located at a depth of ~7 km below the surface. This anomaly is connected with the volcanic cone and is associated with a vertical seismicity cluster, which possibly marks the pathway of fluid ascent and degassing. Between the volcanoes, a 2- to 3-km thick layer of very low Vp and Vs is interpreted as deposits of volcanoclastic sediments. Generally low Vp/Vs ratios in the area between the volcanoes show that the magma reservoirs in the upper crust are not interconnected.
первоисточник: Journal of Geophysical Research: Solid Earth
том: 9
страницы: 9694-9713
ISBN:
ISSN:
внешние ссылки:
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полный текст статьи

jgr-2019-124-9-9694-9713