Groundwater level changes in a deep well in response to a magma intrusion event on Kilauea Volcano, Hawai'i
Groundwater level changes in a deep well in response to a magma intrusion event on Kilauea Volcano, Hawai'i
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夏威夷基拉韦厄火山岩浆入侵事件导致深井地下水位变化
DOI：
10.1029/2003gl018676
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发表时间：
2003
影响因子：
5.2
通讯作者：
M. Johnston
中科院分区：
文献类型：
--
作者：
S. Hurwitz;M. Johnston
2001年5月21日，基拉韦厄火山山顶突然膨胀，导致压缩应变迅速而大幅增加，钻孔扩张仪记录到的最大压缩应变为2μ。水位(气压)同时下降了6厘米。这种水位变化(下降)模式与孔弹性理论中对压缩应变的预期模式相反，因此提出，侵入所施加的应力导致裂缝或交汇处裂隙的打开，从而将水排出井外。当膨胀计记录的应力松弛后，水位以类似的速度恢复。所提出的模型对地表变形的分析和触发云雾岩浆喷发的机制具有重要意义。
On May 21, 2001, an abrupt inflation of Kilauea Volcano's summit induced a rapid and large increase in compressional strain, with a maximum of 2 μstrain recorded by a borehole dilatometer. Water level (pressure) simultaneously dropped by 6 cm. This mode of water level change (drop) is in contrast to that expected for compressional strain from poroelastic theory, and therefore it is proposed that the stress applied by the intrusion has caused opening of fractures or interflows that drained water out of the well. Upon relaxation of the stress recorded by the dilatometer, water levels have recovered at a similar rate. The proposed model has implications for the analysis of ground surface deformation and for mechanisms that trigger phreatomagmatic eruptions.