豫北地区视应力时空变化特征
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摘要
利用2008年以来豫北地区49次M_L 2.5以上地震资料,通过Brune模型,结合遗传算法,反演计算得到豫北地区地震视应力范围为0.029 9 MPa—0.642 MPa,平均视应力为0.174 8 MPa,分析该区视应力时空变化特征,讨论震级和能量的关系,结果表明,豫北地区目前处于应力积累阶段,应力高值集中在聊兰断裂濮阳—鄄城段范县地区。
Using the seismic data over 49 times M_L 2.5 in the north of Henan Province since 2008,the seismic visual stress range of the north of Henan area is (0.0299—0.642) MPa, and the average apparent stress is 0.174 8 MPa. The spatial and temporal variation characteristics of the apparent stress in this area are analyzed by Brune model and genetic algorithm inversion.The relationship between the magnitude and the energy is discussed. The results indicates that the north of Henan area is currently in the stage of stress accumulation, and the high value of stress is concentrated in the Fanxian area of the Xiangyang-Juancheng section of Liaolan fault.
Using the seismic data over 49 times M_L 2.5 in the north of Henan Province since 2008,the seismic visual stress range of the north of Henan area is (0.0299—0.642) MPa, and the average apparent stress is 0.174 8 MPa. The spatial and temporal variation characteristics of the apparent stress in this area are analyzed by Brune model and genetic algorithm inversion.The relationship between the magnitude and the energy is discussed. The results indicates that the north of Henan area is currently in the stage of stress accumulation, and the high value of stress is concentrated in the Fanxian area of the Xiangyang-Juancheng section of Liaolan fault.
引文
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程万正,陈学忠,乔慧珍.四川地震辐射能量和视应力的研究[J].地球物理学进展,2006,21(3):692-699.
吴忠良,黄静,林碧苍.中国西部地震视应力的空间分布[J].地震学报,2002,24(3):293-301.
谢富仁,张世民,窦素芹,等.青藏高原北、东边缘第四纪构造应力场演化特征[J].地震学报,1999,21(5):502-512.
谢玉玲,李建平,黎彤.华北地台的地层和岩浆岩分布特征[J].现代地质,1996,10(1):60-65.
张丽晓,闫俊岗,李艳娥,等.晋冀鲁豫交界地区中小地震视应力特征研究[J].地震,2018,38(1):117-127.
赵建涛,崔效锋,谢富仁.唐山地震震源区构造应力场强度的初步分析[J].地震学报,2002,24(3):268-276.
中国地震局监测预报司.地震参数--数字地震学在地震预测中的应用[M].北京:地震出版社,2003.
周翠英,侯海峰,华爱军,等.山东及其近海区地震序列类型地理分布特征[J].华北地震科学,2001,19(3):15-27.
Choy G L,Boatwright J L.Global patterns of radiated seismic energy and apparent stress[J].J Geophys Res Solid Earth,1995,100(B9):18 205-18 228.
Wyss M,Brune J N.Seismic moment,stress,and Source dimensions for earthquakes in the California-Nevada Region[J].J Geophys Res,1968,73(14):4 681-4 694.