基于深度学习的微地震探测与定位揭示溪洛渡储层地震特征及成因

IF 2.6 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Ziyi Li, Lianqing Zhou, Mengqiao Duan, Cuiping Zhao
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引用次数: 0

摘要

溪洛渡水库是金沙江下游开发的第三座水库,是世界上发电量第四大的水库。它位于历史上地震强度高的地区。2013年水库蓄水后,库区发生了大量地震活动,但地震发生机制尚不清楚。本研究收集了溪洛渡库区2020年7月至2022年10月的连续地震记录,基于深度学习地震检测定位工作流LOC-FLOW建立了该地区高精度微地震目录,最终获得4924次地震的高精度定位(比常规目录多5倍)。我们根据目录中地震的时空分布,勾勒出主要的发震构造。根据水位周期性变化与地震活动性的关系,库区地震活动性在水位达到最高点后开始下降的阶段较为活跃。特别是,水位变化率的突然变化很容易引发地震活动。结合各区域地震活动的时空分布特征和前人的数值模拟结果,认为库头区和马诺断裂带附近的地震活动可能是由于水库蓄水引起的正应力和孔压扩散增大引起的,而发生在莲峰断裂带和中村断裂带交汇处的ML 4.6地震可能是发生在隐伏断裂带上的构造活动。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Deep Learning-Based Microseismic Detection and Location Reveal the Seismic Characteristics and Causes in the Xiluodu Reservoir, China
ABSTRACT The Xiluodu reservoir, as the third reservoir developed in the lower Jinsha River, is the fourth largest reservoir in the world in terms of power generation. It is located in an area of historically high seismic intensity. A large amount of seismic activity has occurred in the reservoir area because the reservoir was impounded in 2013, but the mechanism of seismogenesis is still not clear. In this study, we collected continuous seismic records from July 2020 to October 2022 in the Xiluodu reservoir area, built a high-precision microseismic catalog for this region based on a deep learning seismic detection and location workflow called LOC-FLOW, and eventually obtained high-precision locations of 4924 earthquakes (five times more than the routine catalog). We sketched the main seismogenic structures based on the spatial and temporal distribution of the earthquakes in the catalog. According to the relationship between periodic variation of water level and seismic activity, seismicity in the reservoir area is active at the stage when the water level is filling to the highest point and starts to draw down. Especially, the sudden change in the rate of water level variation can easily trigger seismic activity. Combined with the spatiotemporal distribution of seismicity in each region and the previous results of numerical simulation, we concluded that the seismic activity in the reservoir head area and around the Manao fault is likely induced by the increase of normal stress and pore pressure diffusion caused by reservoir impoundment, whereas the ML 4.6 earthquake that occurred at the intersection of the Lianfeng fault and the Zhongcun fault was likely tectonic activity occurring on a concealed fault.
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来源期刊
Bulletin of the Seismological Society of America
Bulletin of the Seismological Society of America 地学-地球化学与地球物理
CiteScore
5.80
自引率
13.30%
发文量
140
审稿时长
3 months
期刊介绍: The Bulletin of the Seismological Society of America, commonly referred to as BSSA, (ISSN 0037-1106) is the premier journal of advanced research in earthquake seismology and related disciplines. It first appeared in 1911 and became a bimonthly in 1963. Each issue is composed of scientific papers on the various aspects of seismology, including investigation of specific earthquakes, theoretical and observational studies of seismic waves, inverse methods for determining the structure of the Earth or the dynamics of the earthquake source, seismometry, earthquake hazard and risk estimation, seismotectonics, and earthquake engineering. Special issues focus on important earthquakes or rapidly changing topics in seismology. BSSA is published by the Seismological Society of America.
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