Locating microseismic sources based upon L-shaped single-component geophone array: A synthetic study
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Locating microseismic sources based upon L-shaped single-component geophone array: A synthetic study DING Liang(丁亮)1, 2, LIU Qin-ya(刘沁雅)2, 3, GAO Er-gen(高尔根)4, QIAN Wei(钱卫)1, SUN Shou-cai(孙守才)5 1. School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China; 2. Department of Physics, University of Toronto, Toronto ON M5S 1A7, Canada; 3. Department of Earth Sciences, University of Toronto, Toronto ON M5S 3B1, Canada; 4. School of Civil Engineering, Anhui Jianzhu University, Hefei, China; 5. School of Earth Sciences, Institute of Disaster Prevention, Beijing 101601 China © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 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. Key words: geophone array; polarization; source location; seismic monitoring Cite this article as: DING Liang, LIU Qin-ya, GAO Er-gen, QIAN Wei, SUN Shou-cai. Locating microseismic sources based upon L-shaped single-component geophone array: A synthetic study [J]. Journal of Central South University, 2020, 27(9): 2711−2725. DOI: https://doi.org/10.1007/s11771-020-4493-9.
1 Introduction Polarization is an important attribute of seismic wave, for it provides the propagating direction of seismic wave and can be used in real-time source position determination [1−6]. Polarization can be estimated by using the amplitude of multi-component seismic data
recorded by single station or station array on free surface, which is called the particle motion direction [7−10]. PARK et al [11] pointed out that as the first-arrival particle motion recorded on free surface is the superposition of incident P waves, the reflected P waves and reflected SV waves, the polarization direction of the incident waves is not the same as the surface particle motion direction (also known as apparent polarization direction), and
Foundation item: Project(KYCX17_0500) supported by the Postgraduate Resea
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