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首页> 外文期刊>Pure and Applied Geophysics >Intrusive Mechanisms at Mt. Etna Forerunning the July-August 2001 Eruption from Seismic and Ground Deformation Data
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Intrusive Mechanisms at Mt. Etna Forerunning the July-August 2001 Eruption from Seismic and Ground Deformation Data

机译:山的侵入机制。埃特纳火山利用地震和地面变形数据预测2001年7月至8月的喷发

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摘要

In this work we present seismological and ground deformation evidence for the phase preparing the July 18 to August 9, 2001 flank eruption at Etna. The analysis performed, through data from the permanent seismic and ground deformation networks, highlighted a strong relationship between seismic strain release at depth and surface deformation. This joint analysis provided strong constraints on the magma rising mechanisms. We show that in the last ten years, after the 1991–1993 eruption, an overall accumulation of tension has affected the volcano. Then we investigate the months preceding the 2001 eruption. In particular, we analyse the strong seismic swarm on April 20–24, 2001, comprising more than 200 events (Mmax = 3.6) with prevalent dextral shear fault mechanisms in the western flank. The swarm showed a ca. NE-SW earthquake alignment which, in agreement with previous cases, can be interpreted as the response of the medium to an intrusive process along the approximately NNW-SSE volcano-genetic trend. These mechanisms, leading to the July 18 to August 9, 2001 flank eruption, are analogous to ones observed some months before the 1991–1993 flank eruption and, more recently, in January 1998 before the February-November 1999 summit eruption.
机译:在这项工作中,我们提供了准备在2001年7月18日至8月9日在埃特纳火山侧面爆发的阶段的地震学和地面变形证据。通过来自永久地震和地面变形网络的数据进行的分析强调了深度处的地震应变释放与地表变形之间的密切关系。这项联合分析对岩浆上升机制提供了强大的约束。我们显示,在1991-1993年喷发之后的最近十年中,紧张局势的总体积累已影响到火山。然后我们调查2001年喷发前的几个月。特别是,我们分析了2001年4月20日至24日的强地震群,其中包括200多个事件(Mmax = 3.6),这些事件具有西侧普遍的右旋剪切断裂机制。蜂群显示出一个约。与以前的案例一致,NE-SW地震定线可以解释为介质对沿着大约NNW-SSE火山成因趋势的侵入过程的响应。这些机制导致2001年7月18日至8月9日的侧翼爆发,类似于在1991-1993年侧翼爆发前几个月,以及最近的1998年1月在1999年2月至11月首脑会议爆发之前观察到的机制。

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