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| 云南地区中小地震静力学和动力学参数定标关系 | |
| 引用本文： | 刘丽芳,杨晶琼,华卫,苏有锦,刘杰.云南地区中小地震静力学和动力学参数定标关系[J].中国地震研究,2012,26(3):399-409. |
| 作者姓名： | 刘丽芳 杨晶琼 华卫 苏有锦 刘杰 |
| 作者单位： | 1) 云南省地震局，昆明市北辰大道842号 650224;1) 云南省地震局，昆明市北辰大道842号 650224;2) 中国地震局地震预测研究所，北京市复兴路63号 100036;1) 云南省地震局，昆明市北辰大道842号 650224;3) 中国地震台网中心, 北京市三里河南横街5号 100045 |
| 基金项目： | The research was funded jointly by the Key Applied and Fundamental Research Project of Yunnan Province (2010CC006)，the Key Project of Yunnan Province ( JCYB-20080601-4)，and the Joint Earthquake Science Foundation of China (C08065)． |
| 摘 要： | Source spectra for moderate and small earthquakes are obtained after removing the path effect, site effect, and instrument response, etc. in the observed S-wave spectra. Based on the Brune source model... |
| 关 键 词： | 中小地震 云南地区 静态 缩放 仪器响应 场地效应 遗传算法 有限带宽 |
Static and Dynamic Scaling Relationships for Moderate and Small Earthquakes in the Yunnan Region |
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| Liu Lifang,Yang Jinqiong,Hua Wei,Su Youjin and Liu Jie.Static and Dynamic Scaling Relationships for Moderate and Small Earthquakes in the Yunnan Region[J].Earthquake Research in China,2012,26(3):399-409. | |
| Authors: | Liu Lifang Yang Jinqiong Hua Wei Su Youjin and Liu Jie |
| Institution: | 1. Earthquake Administration of Yunnan Province, Kunming 650224, China 2. Institute of Earthquake Science, CEA, Beijing 100036, China 3. China Earthquake Networks Center, Beijing 100045, China |
| Abstract: | Source spectra for moderate and small earthquakes are obtained after removing the path effect,site effect,and instrument response,etc. in the observed S-wave spectra. Based on the Brune source model and by means of genetic algorithm, the source parameters including seismic moment, stress drop, source dimension, etc. are determined, the radiated seismic energy for small-to-moderate earthquakes is measured with consideration of underestimation and compensation brought forth by limited bandwidth of the instrument,and the scaling relationships of static and dynamic parameters for earthquakes with ML 2. 0 ～ 5. 3 in the Yunnan region are analyzed. The results show that the seismic moment is between 2. 1 × 1012 N·m and 1. 2 × 1016 N·m,and there is a linear relation of lgM0 = 1. 01ML + 10. 59 between the seismic moment and local magnitude. The source dimension varies from 86. 9m to 1220. 4m. The seismic moment and rupture radius remain a linear correlation of lgM0 = 0. 003a + 12. 90. The stress drop is in the range of 0. 03 ～ 57. 55MPa,and increases with seismic moment for M0 < 4 × 1014 N·m,but it doesn’t vary with seismic moment for M0 > 4 × 1014 N·m. The seismic moment shows dependency of corner frequency. Assuming a constant stress drop,we can obtain the relationship of lgfc = - 1/3 lgM0 + 5. 32 between the seismic moment and corner frequency using least squares fitting. The theoretical radiated seismic energy is between 3. 01 × 106 J and 2. 06 × 1012 J. The linear relationship between the radiated seismic energy and local magnitude is lgER = 1. 18ML + 5. 69. The scaled energy increases with seismic moment for M0 < 4 × 1014 N·m,however it doesn’t seem to vary with seismic moment for M0 > 4 × 1014 N·m. The apparent stress is in the range of 0. 02 ～ 31. 4 MPa,and also seems independent of seismic depth. |
| Keywords: | Source parameter Scaling relation Moderate and small earthquakes Genetic algorithm |
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