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河北文安MS5.1地震前首都圈及邻近地区震源动力学参数时空变化特征
陈学忠,李艳娥,郭祥云
Author NameAffiliation
Chen Xuezhong Institute of Geophysics, CEA, Beijing 100081 , China 
Li Yan'e Institute of Geophysics, CEA, Beijing 100081 , China 
Guo Xiangyun Institute of Geophysics, CEA, Beijing 100081 , China 
摘要:
本文根据在近震源条件下,利用Brune模式,由北京数字遥测地震台网观测到的波形资料,得到了2002年1月至2006年6月期间首都圈及邻近地区989次ML≥2.0地震的震源谱,测定了它们的拐角频率和零频幅值。通过相关计算公式,得到了破裂半径、地震矩、地震能量、应力降、视应力等震源动力学参数。分析了这些动力学参数的标度关系以及在2006年7月4日河北文安MS5.1地震前的时空变化特征。结果表明,文安MS5.1地震前,视应力、应力降、地震能量与破裂半径比等出现了相对高值集中区,这些高值集中区主要分布在华北平原带上;从其时间变化曲线可以看出,文安MS5.1地震前华北平原带上视应力、应力降、地震能量与破裂半径比等参数都表现出了明显的升高变化过程,而拐角频率则显示出趋势性下降变化特征。这可能与文安MS5.1地震前华北平原带上应力的增强过程有关。
关键词:  文安地震 首都圈 震源动力学参数 时空变化
DOI:
分类号:
基金项目:
Temporal-spatial Variations of Dynamic Source Parameters in the Capital Circle Region and Its Surrounding Areas before the 2006 MS5. 1 Wen'an Earthquake in Hebei Province
Chen Xuezhong,Li Yan'e,Guo Xiangyun
Abstract:
Source spectra, corner frequency and zero frequency amplitudes in near-source conditions were measured using waveform data from 989 earthquakes with magnitudes larger than ML2.0 observed by the Beijing Digital Telemetry Seismic Network in the Capital Circle Region of China and its surrounding areas from January 2002 to June 2006 by the Brune model. Relevant formulas that were used for the calculation of dynamic source parameters include rupture radius, seismic moment, seismic energy, stress drop, and apparent stress. Scaling relations and characteristics of temporal-spatial variations of these dynamic parameters before the MS5. 1 Wen'an earthquake in Hebei Province that occurred on July 20, 2006 were analyzed. Results show that apparent stress, stress drop, and the ratio of seismic energy to the rupture radius had relatively high values in some areas before the Wen'an earthquake. These high-value concentration areas were mainly distributed in the North China Plain seismic zone. As is seen from the time curves, parameters, such as apparent stress, stress drop, and ratio of seismic energy to rupture radius underwent significant ascending processes before the Wen'an earthquake, but the variation in the corner frequency showed a descending trend. This result might be related to the enhancement of stress in the North China Plain seismic zone before the earthquake.
Key words:  Dynamic source parameter  Temporal-spatial variation  Wen'an earthquake  The Capital Circle Region