长谷岩腔的上层地盖在长谷岩腔上
Ettore Biondi1, Weiqiang Zhu1, Jiaxuan Li1
1California Institute of Technology, Seismological Laboratory, Pasadena, CA, USA.
Science advances
|October 18, 2023
概括
地理学成像显示了长谷火山的岩室在12公里深处. 这项研究澄清了,来自岩的流体排泄,而不是岩入侵,驱动着火山的动荡和升起.
科学领域:
- 地质物理学 地质物理学
- 火山学 火山学是一门学科.
- 地震学 地震学
背景情况:
- 卡尔德拉动荡,以升起和地震性为特征,是一个关键的危险.
- 长谷火山火山的动荡的驱动机制仍在争论中,其中包括流体释放或岩入侵等假设.
研究的目的:
- 为了在地质上描述长谷火山的地下结构.
- 确定长谷火山中的动荡源,包括升起和地震性.
主要方法:
- 利用来自100公里的光纤电缆的分布式声学传感 (DAS) 数据.
- 使用DAS数据对火山口的地下结构进行了成像.
主要成果:
- 确定了浅水热系统和岩室之间的明显分离.
- 在大约12公里深处定位了岩腔.
- 提供了通过第二次沸液体溶解的证据,作为动荡的原因.
结论:
- 通过第二次沸,从岩腔中的液体排泄是长谷火山口观测到的升起和地震性的主要驱动因素.
- 区分水热系统和深层岩室在火山口动态中的作用.
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