The 2007 caldera collapse of Piton de la Fournaise volcano: Source process from very-long-period seismic signals
The 2007 caldera collapse of Piton de la Fournaise volcano: Source process from very-long-period seismic signals
复制标题
2007 年 Piton de la Fournaise 火山的火山口崩塌：来自超长周期地震信号的震源过程
DOI：
10.31223/osf.io/p29s5
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发表时间：
2019
影响因子：
5.3
通讯作者：
L. Rivera
中科院分区：
文献类型：
--
作者：
Z. Duputel;L. Rivera
2007年4月，Piton de la Fournaise火山经历了至少300年以来最大的火山口崩塌。该事件由一系列48个下沉增量组成，其特征为相当于mw4.4至5.4的极长周期（VLP）地震信号。VLP事件的震源分析表明其具有类似活塞的机制，裂缝源的崩塌对应于岩浆库的收缩，而单一的力则代表上述岩柱的崩塌。研究表明，崩塌动力学主要受岩浆从储层中撤出的控制，在事件发生时，储层可能处于气泡状态。与2018年的基拉韦厄崩塌类似，我们观察到连续沉降增量之间的时间间隔缩短，这是由于岩浆撤离的加速和序列开始时建筑物的逐渐弱化造成的。
Abstract In April 2007, Piton de la Fournaise volcano experienced its largest caldera collapse in at least 300 yr. This event consisted of a series of 48 subsidence increments characterized by very-long-period (VLP) seismic signals equivalent to M w 4.4 to 5.4. Source analysis of VLP events suggests a piston-like mechanism with a collapsing crack source corresponding to the contraction of the magma reservoir and a single force representing the collapse of the above rock column. We show that the collapse dynamics is primarily controlled by magma withdrawal from the reservoir, which was likely in a bubbly state at the time of the event. Similar to the 2018 Kilauea collapse, we observe a reduction of the time-interval between successive subsidence increments, which results from the acceleration of magma withdrawal and a progressive weakening of the edifice at the beginning of the sequence.
影响因子：
2.8
作者：
Zo¨e K. Mildon;Gji Seismology;Zo¨e K. Mildon;D. Pugh;J. Tarasewicz;R. White;Brynd´ıs Brandsd´ottir
通讯作者：
Zo¨e K. Mildon;Gji Seismology;Zo¨e K. Mildon;D. Pugh;J. Tarasewicz;R. White;Brynd´ıs Brandsd´ottir