[1]杨 选,马晓静.2023年2月5日三水ML4.0级矿山地震震相特征与发震构造[J].华南地震,2023,(04):107-118.[doi:10.13512/j.hndz.2023.04.14]
 YANG Xuan,MA Xiaojing.Seismic Phase Characteristics and Seismogenic Structure of the Sanshui ML4.0 Mining-induced Earthquake on February 5th,2023[J].,2023,(04):107-118.[doi:10.13512/j.hndz.2023.04.14]
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2023年2月5日三水ML4.0级矿山地震震相特征与发震构造()
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华南地震[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2023年04期
页码:
107-118
栏目:
三水3.2级地震、河源4.3级地震专栏
出版日期:
2023-12-30

文章信息/Info

Title:
Seismic Phase Characteristics and Seismogenic Structure of the Sanshui ML4.0 Mining-induced Earthquake on February 5th,2023
文章编号:
1001-8662(2023)04-0107-12
作者:
杨 选马晓静
广东省地震局,广州 510070
Author(s):
YANG XuanMA Xiaojing
Guangdong Earthquake Agency,Guangzhou 510070,China
关键词:
三水地区矿山地震震相特征震源定位发震断裂
Keywords:
Sanshui region Mining-induced earthquake Seismic phase characteristics Source locationSeismogenic fault
分类号:
P315.7
DOI:
10.13512/j.hndz.2023.04.14
文献标志码:
A
摘要:
2023年2月5日广东三水发生了ML4.0级地震,佛山、广州、深圳等地区有感,有感范围广泛,且震中位于盐矿开采区,因此特别引人关注。通过收集震中800km范围内质量较高的342个测震记录和410个强震记录,经过人工仔细分析,识别出了967个震相,统计分析发现:所有台站记录都在Sg波之前有丰富的高频成份,有75个台站记录中在Sg波之后出现了周期变化(周期在1.1~1.5s之间)、毛刺少、振动规则的短周期面波,其持续时间大致在5~20s之间;面波振幅整体随震中距增大而减小,但在部份台站存在突然增大数倍的现象,最大峰值的视速度约为2.85km/s,在垂直向比较明显,符合Rg面波的特征;用深度震相sPn测定的震源深度约为3.8±0.39km,重新修订的震中位置为:经度112.9583°N,纬度23.2716°E;初动呈四象限分布,确定的发震构造为走向334.90°,倾角54.04°,滑动角-18.84°,错动类型以左旋走滑为主,兼少量正断。综合分析认为,这是由长期的抽取卤水采盐活动引起的。采空区的应力变化导致矿体的应力分布发生调整,沿F7断层的应力超过了其承载能力,在区域应力主控制下使上盘发生破裂和滑动,从而引发了与采矿活动密切相关的矿山地震。
Abstract:
On February 5th,2023,an ML4.0 earthquake occurred in Sanshui,Guangdong,which was felt in Foshan,Guangzhou,Shenzhen and other areas. The feeling range is wide,and the epicenter is located in the salt mining area,so it attracts significant attention.This article collected and carefully analyzed 342 high-quality seismic records and 410 strong-motion records within a 800 km of the epicenter. Through manual analysis,a total of 967 seismic phases were identified. The statistical analysis reveals that:All station records exhibits substantial high-fre‐quency components before the arrival of the Sg wave. After the Sg wave,there are 75 stations recorded short-period surface waves with periodic changes(period between 1.1-1.5 s),less burrs and regular vibration,and their dura‐tion is about 5-20 s. Overall amplitude of surface waves decreases with the increase of the epicenter distance,but there is a sudden increase of several times at some stations. The apparent velocity of the maximum peak is about 2.85 km/s,which is more obvious in the vertical direction,and consistent with the characteristics of Rg surface wave. The focal depth determined by the depth phase sPn is about 3.8±0.39 km,and the revised epicentral location is:112.958 3°N,23.271 6°E. The initial motion is distributed in four quadrants,and the determined seismogenic structure is:strike 334.90°,dip angle 54.04°,and a slip angle-18.84°. The dislocation type is mainly left-later‐al strike-slip,with a small amount of normal fault. Through comprehensive analysis,it is believed that this earth‐quake is induced by long-term brine extraction and salt mining activities. The stress variations within the mined-out area leads to the adjustments in the stress distribution of the ore body. The stress along the F7 fault exceeded its load-bearing capacity,resulting in rupture and sliding of the hanging wall under the predominant control of region‐al stress,which leads to the mining-induced earthquake closely related to the mining activity.

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备注/Memo

备注/Memo:
收稿日期:2023-04-29
基金项目:广东省省级科技计划协同创新与平台环境建设重点项目(2019B020208014)
作者简介:杨选(1978-),男,高级工程师,主要从事地震观测及数字地震资料应用研究。
E-mail:27960687@qq.com
更新日期/Last Update: 2023-12-30