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广西平果“6?16”震群震源参数特征
Hypocentral Parameter Characteristics of The Earthquake Swarm Occurring in Pingguo of Guangxi Zhuang Autonomous Region in 2013
- DOI:
- 作者:
- 陆丽娟 史水平 周 斌*
Lu lijuan, Shi shuiping, Zhoubin
- 作者单位:
- 中国南宁530022广西壮族自治区地震局
Earthquake Administration of Guangxi Zhuang Autonomous Region，Nanning 530022，China
- 关键词:
- Brune模型；震源参数；定标关系
Brune model；Hypocentral parameter；Scaling relation
- 摘要:
- 利用广西数字地震台网记录的2013年6月—7月广西平果ML1.0—3.0震群162次地震波形资料，采用Brune(1970)模型，通过几何扩散校正、介质衰减校正、仪器校正等将速度记录谱归算为震源位移谱，使用遗传算法计算拐角频率及零频极限，然后计算地震矩、应力降等小震震源参数，系统分析各种参数之间的关系。研究表明：近震震级、地震矩、震源破裂半径、拐角频率、应力降等之间可以拟合为对数或半对数的线性关系；地震应力降、视应力与震源破裂半径没有明显的依赖关系，但与地震矩成正相关关系；与其他地区的同类研究结果基本一致，获得各参数的定标关系相近，尤其是通过最小二乘法拟合应力降与地震矩之间的关系后，与浙江珊溪水库地区的应力降与地震矩之间的关系有很强的一致性；与其他地区的应力降及视应力降相比较，本研究区属于低应力释放地区，
Using the Brune model(1970) and the digital seismic wave data of the earthquake swarm occurring in Pingguo of Guangxi Zhuang Autonomous Region in 2013，which was recorded by Guangxi seismic network，we transferred the recorded velocity spectrum into hypocenter displacement spectrum by geometry diffusion correction，dielectric attenuation correction and instrumental correction．The corner frequency and zero frequency were calculated by using genetic algorithm，further，the hypocentral parameters including hypocentral radius and seismic moment were calculated and the relationships among them were analyzed systematically．The Research results show that the relations between seismic moment，body-wave magnitude，rupture radius and corner frequency are near log-linear or semi-log—linear．Seismic stress drop and apparent stress show little obvious correlation with hypocenter radius，but display positive correlation with seismic moment．Consistent with the results of similar studies in other regions, similar to the parameters obtained scaling relations, especially fitting relationship between stress drop and seismic moment by the least squares method, the Zhejiang region of Shanxi reservoir stress drop and seismic moment there is a strong relationship between consistency; Compared with the stress drop and apparent stress drop in other regions, the study area belongs to the region of low stress release, but due to seismic events shorter time span of the study, and the c
