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Locating microseismic sources based upon L-shaped single-component geophone array: A synthetic study

基于L 形单分量检波器组合台站的微地震震源精定位方法

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Abstract

We have developed a type of L-shaped single-component geophone array as a single station (L-array station) for surface microseismic monitoring. The L-array station consists of two orthogonal sensor arrays, each being a linear array of single-component sensors. L-array stations can be used to accurately estimate the polarization of first arrivals without amplitude picking. In a synthetic example, we first use segmentally iterative ray tracing (SIRT) method and forward model to calculate the travel time and polarization of first arrivals at a set of L-array stations. Then, for each L-array station, the relative delay times of first arrivals along sensor arrays are used to estimate the polarization vector. The small errors in estimated polarization vectors show the reliability and robustness of polarization estimation based on L-array stations. We then use reverse-time ray-tracing (RTRT) method to locate the source position based on estimated polarizations at a set of L-array stations. Very small errors in inverted source location and origin time indicate the great potential of L-array stations for source localization applications in surface microseismic monitoring.

摘要

本文研究了基于L 形单分量检波器组合作为单个地震观测台时的微地震震源定位方法。首先, 介绍方法的实施过程, 包括利用两条相互正交的单分量检波器线性排列组合作为单个台站采集连续地 震资料, 利用速度扫描方法分析两正交检波器排列中直达P 波视速度, 根据近地表速度进一步求解直 达P 波的出射矢量及利用逆时射线追踪震源定位方法求解微地震震源位置。然后, 基于数值模拟研究 L 型检波器台站观测下微地震震源精定位方法的准确性及精度高, 结果表明可准确获取各台站直达P 波射线矢量并精准确定震源位置。最后, 分析了噪声对定位结果的影响, 结果表明, 噪声下仍可有效 获取检波器排列的直达P 波射线矢量, 对定位结果影响小。

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Authors and Affiliations

  1. School of Earth Sciences and Engineering, Hohai University, Nanjing, 211100, China

    Liang Ding  (丁亮) & Wei Qian  (钱卫)

  2. Department of Physics, University of Toronto, Toronto, ON, M5S 1A7, Canada

    Liang Ding  (丁亮) & Qin-ya Liu  (刘沁雅)

  3. Department of Earth Sciences, University of Toronto, Toronto, ON, M5S 3B1, Canada

    Qin-ya Liu  (刘沁雅)

  4. School of Civil Engineering, Anhui Jianzhu University, Hefei, China

    Er-gen Gao  (高尔根)

  5. School of Earth Sciences, Institute of Disaster Prevention, Beijing, 101601, China

    Shou-cai Sun  (孙守才)

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  1. Liang Ding  (丁亮)
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Correspondence to Liang Ding  (丁亮).

Additional information

Foundation item

Project(KYCX17_0500) supported by the Postgraduate Research & Practice Innovation Program of Jiangsu Province, China; Projects(2013/B17020664X, 2014B17614) supported by the Fundamental Research Funds for the Central Universities, China; Project(41174043) supported by the National Natural Science Foundation of China; Project supported by the Funds from China Scholarship Council (CSC); Project(487237) supported by the NSERC Discovery Grant for LIU Qin-ya

Contributors

DING Liang conducted the study and edited the draft of manuscript. LIU Qin-ya helped to revise the draft of manuscript. GAO Er-gen provided suggestions on source localization. SUN Shou-cai presented the idea of the velocity scanning. QIAN Wei helped to conduct the numerical test.

Conflict of interest

DING Liang, LIU Qin-ya, GAO Er-gen, QIAN Wei and SUN Shou-cai declare that they have no conflict of interest.

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Ding, L., Liu, Qy., Gao, Eg. et al. Locating microseismic sources based upon L-shaped single-component geophone array: A synthetic study. J. Cent. South Univ. 27, 2711–2725 (2020). https://doi.org/10.1007/s11771-020-4493-9

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