冰川下火山监测与光纤传感:Grímsvötn,冰岛

IF 2.5 Q2 Earth and Planetary Sciences
Sara Klaasen, Solvi Thrastarson, Yeşim Çubuk-Sabuncu, Kristín Jónsdóttir, Lars Gebraad, P. Paitz, Andreas Fichtner
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引用次数: 1

摘要

我们提出了一个分布式声传感(DAS)实验在Grímsvötn,冰岛。这是为了专门研究Grímsvötn的火山微震活动,并评估DAS作为冰下火山监测工具的适用性。2021年春天,我们在火山口周围和火山口内部的冰盖上挖了一条12公里长的光纤电缆,随后进行了近一个月的连续记录。利用DAS数据的空间相干性的图像处理算法平均每天检测到约100个事件,几乎比区域地震目录多2个数量级。非线性贝叶斯反演揭示了明显的地震活动集群的存在,其中包含震级在- 3.4到1.7之间的事件。它们与地表火山特征的接近表明它们是地热起源。除了绘制Grímsvötn地震活动的精细图像外,这项工作还证实了DAS在冰下火山监测中的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Subglacial volcano monitoring with fibre-optic sensing: Grímsvötn, Iceland
We present a distributed acoustic sensing (DAS) experiment at Grímsvötn, Iceland. This is intended to investigate volcano-microseismicity at Grímsvötn specifically, and to assess the suitability of DAS as a subglacial volcano monitoring tool in general. In spring 2021, we trenched a 12 km long fiber-optic cable into the ice sheet around and within the caldera, followed by nearly one month of continuous recording. An image processing algorithm that exploits spatial coherence in DAS data detects on average ~100 events per day, almost 2 orders of magnitude more than in the regional earthquake catalog. A nonlinear Bayesian inversion reveals the presence of pronounced seismicity clusters, containing events with magnitudes between −3.4 and 1.7. Their close proximity to surface volcanic features suggests a geothermal origin. In addition to painting a fine-scale picture of seismic activity at Grímsvötn, this work confirms the potential of DAS in subglacial volcano monitoring.
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来源期刊
Volcanica
Volcanica Earth and Planetary Sciences-Geology
CiteScore
4.40
自引率
0.00%
发文量
21
审稿时长
21 weeks
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