| 浙江珊溪水库地震震源参数特征研究 |
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| 引用本文： | 马起杨,朱新运.浙江珊溪水库地震震源参数特征研究[J].地震学报,2016,38(6):835-846. |
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| 作者姓名： | 马起杨 朱新运 |
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| 作者单位： | 中国杭州 310013 浙江省地震局 |
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| 基金项目： | 中国地震局星火计划攻关项目XH12023中国地震局星火计划攻关项目(XH12023)和公益技术研究社会发展项目(2014C33050)共同资助公益技术研究社会发展项目2014C33050 |
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| 摘 要： | 利用2014年1月-2015年12月浙江省区域数字地震台网记录的1 360次珊溪水库ML0.5-4.4地震资料，采用Brune模式，将台站获取的速度记录进行几何扩散校正、介质衰减校正及仪器校正后得到速度谱，对速度谱在频率域进行傅里叶积分得到震源位移谱，之后使用遗传算法计算得到拐角频率和震源位移谱零频极限值，进而计算出该区的地震矩为1010-1014 N·m，震源破裂半径为33-550 m，拐角频率为2.4-39.7 Hz，地震应力降为0.04-6.74 MPa，视应力为0-2.75 MPa.在此基础上，对各参数特征及其关系进行系统性分析，结果表明:各震源参数之间表现出一定的对数线性或半对数线性关系；空间上，应力降和拐角频率在库区西北段较高，东南段较低；应力降与地震矩在空间上呈反向关系，拐角频率与破裂半径在空间上呈负相关.
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| 关 键 词： | 水库地震 震源参数 拐角频率 时空分布 |
| 收稿时间： | 2016-02-29 |
Characteristics of source parameters of the Shanxi Reservoir earthquakes in Zhejiang region |
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| Affiliation: | Earthquake Administration of Zhejiang Province, Hangzhou 310013, China |
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| Abstract: | According to the seismic data of 1 360 earthquakes with ML0.5-4.4 occurred in Shanxi Reservoir from January of 2014 to December of 2015, which were recorded by the Regional Digital Seismic Network of Zhejiang Province, this paper obtains the source displacement spectra by using Fourier integration of velocity spectrum in the frequency field based on the Brune's model, after the geometrical diffusion correction, medium attenuation correction and instrument correction of the velocity records from the stations, and then the corner frequency and the source displacement spectra at the zero frequency are acquired with the genetic algorithm. And then the radius of the epicenter, the seismic moments and other small local earthquake source parameters are calculated. Furthermore, this paper systematically analyzes the characteristics of the source parameters and the relationship among the parameters. The results show that: seismic moment ranges 1010-1014 N·m, the range of source radius is 33-550 m, the corner frequency ranges 2.4-39.7 Hz, seismic stress drop is in the range of 0.04-6.74 MPa, and apparent stress is in the range of 0-2.75 MPa. The result also show that there is some log-linear or semi-logarithmic linear relationships among the seismic moment, corner frequency, Richter magnitude, moment magnitude and other source parameters. In the space domain, the stress drop and the corner frequency are higher at northwest section of Shanxi Reservoir area and lower at southeast section. In addition, there is opposite relationship between the stress drop and the seismic moment in space, meanwhile the corner frequency is negatively correlated to the source radius in space. |
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