The Potential of DAS in Teleseismic Studies: Insights From the Goldstone Experiment
The Potential of DAS in Teleseismic Studies: Insights From the Goldstone Experiment
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DOI：
10.1029/2018gl081195
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发表时间：
2019-02
影响因子：
5.2
通讯作者：
Chunquan Yu;Z. Zhan;N. Lindsey;J. Ajo-Franklin;M. Robertson
中科院分区：
文献类型：
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作者：
Chunquan Yu;Z. Zhan;N. Lindsey;J. Ajo-Franklin;M. Robertson
分布式声学传感（DAS）是最近发展起来的技术，已证明其在石油和天然气工业中的实用性。在这里，我们展示了DAS在地震研究中的潜力，使用戈德斯通光纤地震实验在加州。通过分析2018年1月10日洪都拉斯7.5级地震记录在约5，000个DAS通道和附近宽带站GSC上的地震波波形，我们首先使用垂直分量GSC速度作为入射源子波的近似值来计算DAS通道的接收器函数。在DAS接收器功能上可以清楚地看到Moho P‐to‐s转换。然后，我们推导出米级的到达时间测量沿着整个20公里长的阵列。我们还能够测量路径平均瑞利波群速度和局部瑞利波相速度。然而，后者具有很大的不确定性。我们的研究表明，DAS可能会在不久的将来在被动地震学的许多领域发挥重要作用。
Distributed acoustic sensing (DAS) is a recently developed technique that has demonstrated its utility in the oil and gas industry. Here we demonstrate the potential of DAS in teleseismic studies using the Goldstone OpticaL Fiber Seismic experiment in Goldstone, California. By analyzing teleseismic waveforms from the 10 January 2018 M7.5 Honduras earthquake recorded on ~5,000 DAS channels and the nearby broadband station GSC, we first compute receiver functions for DAS channels using the vertical‐component GSC velocity as an approximation for the incident source wavelet. The Moho P‐to‐s conversions are clearly visible on DAS receiver functions. We then derive meter‐scale arrival time measurements along the entire 20‐km‐long array. We are also able to measure path‐averaged Rayleigh wave group velocity and local Rayleigh wave phase velocity. The latter, however, has large uncertainties. Our study suggests that DAS will likely play an important role in many fields of passive seismology in the near future.