Geolocalization of Large-Scale DAS Channels Using a GPS-Tracked Moving Vehicle
Geolocalization of Large-Scale DAS Channels Using a GPS-Tracked Moving Vehicle
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DOI：
10.1785/0220220169
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发表时间：
2023-01-01
影响因子：
3.3
通讯作者：
Zhan, Zhongwen
中科院分区：
文献类型：
--
作者：
Biondi, Ettore;Wang, Xin;Zhan, Zhongwen
分布式声学传感(DAS)阵列通道的地理定位是该技术在现场部署时的关键一步。通常，地理定位是使用在记录光纤附近进行的称为分接测试的逐点有源源实验来执行的。然而，这些受控源实验非常耗时，并极大地降低了迅速部署此类系统的能力，尤其是对于大规模的DAS实验。我们提出了一种依赖于地理跟踪车辆产生的地震信号的DAS仪器的地理定位方法。我们通过对两个DAS系统的通道进行地理定位，在加州东部长谷火山口地区绵延约100公里的暗光纤上记录数据，证明了我们工作流程的有效性。我们的程序允许迅速校准DAS通道位置，用于与地震相关的应用，如地震危险性评估、城市噪声监测、波速反演和地震工程。我们分享了开发的代码集以及指导用户完成整个地图过程的教程。
Geolocalization of distributed acoustic sensing (DAS) array channels represents a crucial step whenever the technology is deployed in the field. Commonly, the geolocalization is performed using point-wise active-source experiments, known as tap tests, conducted in the vicinity of the recording fiber. However, these controlled-source experiments are time consuming and greatly diminish the ability to promptly deploy such systems, especially for large-scale DAS experiments. We present a geolocalization methodology for DAS instrumentation that relies on seismic signals generated by a geotracked vehicle. We demonstrate the efficacy of our workflow by geolocating the channels of two DAS sys-tems recording data on dark fibers stretching approximately 100 km within the Long Valley caldera area in eastern California. Our procedure permits the prompt calibration of DAS channel locations for seismic-related applications such as seismic hazard assess-ment, urban-noise monitoring, wavespeed inversion, and earthquake engineering. We share the developed set of codes along with a tutorial guiding users through the entire mapping process.