摘要
2013年6月16日至7月底广西平果县果化镇附近发生密集、震感明显的震群活动。结合震中区地震地质背景、震群序列及震群深度等方面特征,利用广西数字地震台网的波形记录,计算并分析ML2.0级以上地震的拐角频率、应力降。研究表明:平果震群是一组由天然地震、水库地震、塌陷地震等多种类型地震交叉叠加的震群活动,其频度高、震源浅、震感明显;在震级相同情况下,其拐角频率和应力降均比本区域构造地震的拐角频率和应力降小,其中应力降小约1个量级;附近的排泥库随着排入泥浆增加,加之库区地质条件复杂,岩溶裂隙发育,应注意"水库诱发型"地震的发生。
From June 16 th, 2013 to the e nd of July, near the Guohua town in Pingguo country of Guangxi,dense earthquake swarm activity is obviously felt. Combined with the geological background of the epicentral region, the earthquake swarm sequence and swarm depth characteristics, the waveforms recorded by Guangxi digital seismic network, the paper calculated and analyzed the corner frequency, stress drop of ML2.0earthquakes. The results show that： Pingguo earthquake swarm with high frequency, light source, obviously feel is a group of natural earthquakes, reservoirs earthquakes, the collapse earthquakes and other types earthquakes of seismic cross superposition of the earthquake swarm activity; under the same magnitude, the corner frequency and stress drop are lower than that of regional tectonic earthquakes, the stress drop is about 1 order lower; with the increase of mud in the mud pool, and coupled with the complex geological conditions of reservoir, karst fractured, ＂reservoir induced earthquake＂ should be pay attention to.
出处
《华南地震》
2015年第2期89-95,共7页
South China Journal of Seismology
基金
广西地震局三结合项目(GXJ2011002)
中国地震局测震台网青年骨干培养专项(20140318
20142018)共同资助
关键词
震群
震相特征
震源参数
拐角频度
应力降
Earthquake swarm
Characteristics of seismic phase
Source parameters
Corner frequency
Stress drop
