| 重庆石柱M4.5及武隆M5.0地震前视应力异常对比 |
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| 引用本文： | 陈丽娟,龚丽文,董娣,董蕾.重庆石柱M4.5及武隆M5.0地震前视应力异常对比[J].大地测量与地球动力学,2021,41(3):249-253. |
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| 作者姓名： | 陈丽娟 龚丽文 董娣 董蕾 |
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| 作者单位： | 重庆市地震局,重庆市红黄路339号,401147 |
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| 基金项目： | 中国地震局震情跟踪定向工作任务;中国地震局地震科技星火计划;重庆市地震局2020年课题 |
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| 摘 要： | 对重庆石柱和武隆地区的中小地震进行波谱分析得到地震能量、拐角频率、地震矩、视应力等震源谱参数，对比分析石柱M4.5及武隆M5.0地震前震源谱参数的差异。分析结果表明：1）同震级条件下，石柱地区的地震拐角频率及视应力均低于武隆地区，可能与石柱地区距离三峡库区较近有关。2）石柱地区的视应力在石柱M4.5地震前出现震前2 a上升、临震略微下降的变化过程，拐角频率在震前也有所升高。3）武隆地区的视应力在石柱M4.5和武隆M5.0地震前均出现“上升-下降-升高”的异常变化，拐角频率在2次地震前也呈现升高特征。4）研究区内所有地震的视应力在石柱M4.5和武隆M5.0地震前均出现上升变化，震后该区构造应力依然较高。
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| 关 键 词： | 三峡库区 石柱M4.5地震 武隆M5.0地震 视应力 拐角频率 |
Comparison of Apparent Stress Anomalies between Shizhu M4.5 Earthquake and Wulong M5.0 Earthquake in Chongqing |
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| CHEN Lijuan,GONG Liwen,DONG Di,DONG Lei.Comparison of Apparent Stress Anomalies between Shizhu M4.5 Earthquake and Wulong M5.0 Earthquake in Chongqing[J].Journal of Geodesy and Geodynamics,2021,41(3):249-253. |
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| Authors: | CHEN Lijuan GONG Liwen DONG Di DONG Lei |
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| Institution: | (Chongqing Earthquake Agency,Chongqing 401147,China) |
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| Abstract: | We obtain the seismic-source spectral parameters of seismic energy,corner frequency,seismic moment and apparent stress by spectral analysis of small and medium earthquakes in Shizhu and Wulong areas.We comparatively analyze the differences of seismic-source spectrum parameters of the Shizhu M4.5 earthquake and the Wulong M5.0 earthquake.The results show:1)Corner frequency and apparent stress in Shizhu area are lower than that in Wulong area under the same magnitude conditions,which may be related to the closer distance from Shizhu to the Three Gorges Reservoir area.2)The apparent stress in Shizhu area presents two years rising process,decreasing slightly before the main shock,and corner frequency also increasing before the earthquake.3)The apparent stress in Wulong area presents abnormal changes of“rise-descent-rise”before the Shizhu M4.5 and the Wulong M5.0 earthquakes,and corner frequency also increases before the two earthquakes.4)The apparent stress of the whole study area has undergone an ascending change process before the Shizhu M4.5 and the Wulong M5.0 earthquakes,and the stress in this area remains high after the earthquakes. |
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| Keywords: | Three Gorges Reservoir area Shizhu M4 5 earthquake Wulong M5 0 earthquake apparent stress corner frequency |
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