The Role of Tectonic Stress in Triggering Large Silicic Caldera Eruptions
The Role of Tectonic Stress in Triggering Large Silicic Caldera Eruptions
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DOI：
10.1029/2018gl077393
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发表时间：
2018-05-16
影响因子：
5.2
通讯作者：
Grosfils, Eric B.
中科院分区：
文献类型：
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作者：
Cabaniss, Haley E.;Gregg, Patricia M.;Grosfils, Eric B.
我们利用3-D温度相关粘弹性有限元模型来研究支撑大破火山口大小的岩浆储层（体积> 10（2）km（3））的寄主岩石对局部构造应力的力学响应。寄主岩石的机械稳定性被用来确定最大的预测休止期和岩浆流量率，系统可能会经历连续喷发被触发之前。数值结果表明，区域性伸展降低了岩浆库上覆顶板岩石的稳定性，从而促进了早期爆发的破火山口坍塌。或者，适度的压缩（
We utilize 3-D temperature-dependent viscoelastic finite element models to investigate the mechanical response of the host rock supporting large caldera-size magma reservoirs (volumes > 10(2) km(3)) to local tectonic stresses. The mechanical stability of the host rock is used to determine the maximum predicted repose intervals and magma flux rates that systems may experience before successive eruption is triggered. Numerical results indicate that regional extension decreases the stability of the roof rock overlying a magma reservoir, thereby promoting early-onset caldera collapse. Alternatively, moderate amounts of compression (