河套地震带的震源机制类型时空分布特征

doi:10.13278/j.cnki.jjuese.201502301

摘要/Abstract

摘要：

基于地质构造背景分析,收集2000年以来发生在河套地震带的M_L≥2.8级地震作为研究对象,综合运用基于P波初动的振幅比方法(APAS)和基于波形拟合的CAP反演方法求出256次地震事件的震源机制解。以断层节面滑动角作为判定指标,分区域给出了河套地震带的震源机制类型空间和时间分布图像,从断层滑动角度呈现河套地震带应力场时空变化过程。结果显示:临河盆地断层节面滑动角主要在水平±20°方向存在优势分布,走滑型特征显著;具体来讲,狼山-色尔腾山山前断裂带、临河断裂、乌拉山山前断裂等主要以纯走滑型地震为主,巴彦乌拉山断裂与磴口-本井断裂之间的区域多分布正走滑型地震。呼包盆地断层节面解虽然也呈现出走滑型为主的特征,但滑动角分布较为离散,优势分布方向不明显;呼包盆地西侧的包头至西山咀凸起一带表现出以走滑为主的小范围震源应力场特征,呼包盆地内部及东侧由于显著的区域垂直差异运动,正断层和逆冲型地震所占比例较大,震源机制类型整体呈现出与构造相依的分布特点。分析认为,2000年以来,河套地震带的应力场存在一定的时空非均匀性变化,研究结果更多表现了河套地震带的震源应力场变化过程,而研究资料时间不够长和震级不够大是引起这种应力场非均匀性暂态特征的主要因素。

关键词: 河套地震带, 震源机制类型, 矩张量反演, 振幅比, 滑动角

Abstract:

Based on the analysis of the geological structure background, and the collected earthquake (M_L≥2.8) data in Hetao seismic zone since 2000,the focal mechanism of 256 is calculated by using P wave first motion amplitude ratio method(APAS) and CAP retrieval method. Taken the fault plane slide angle as the indicater, we made the space and time distribution chart of the focal mechanism types in different zones, which depicts the space and time variation of the stress field in Hetao seismic zone. The results show that the fault plane slide angle in Linhe basin appeared dominant in horizontal ±20°, a significant feature of strike slip type. This type of earthquakes are distributed mainly in Langshan Seertengshan fault zone, Linhe fault and Wulashan fault zone. The normal-strike-slip type of earthquakes are distributed mainly between Bayanwulashan fault zone and Benjin fault. Hubao basin faults are mainly strike-slip type, but the slide rangles are dispersed with on clear direction and space correlation West side of Hubao basinand Baotou-Xishanzui rise show a small-scale slip focal stress field characteristics; thrust and normal earthquakes take a great proportion in the inside and east side of Hubao basin resulted from the vertical differential movement,and the focal mechanism is structure-dependent. According to the analysis in the study area and in the period,the gravitational field in the seismic belt varies non-uniformly in space and time. The non-uniformty is mainly result by the limitation of the time span and the magnitude

Key words: Hetao seismic belt, focal mechanism type, moment tensor inversion, amplitude ratio, rake

中图分类号:

P631.4

韩晓明, 刘芳, 胡博, 张帆. 河套地震带的震源机制类型时空分布特征[J]. 吉林大学学报(地球科学版), 2015, 45(2): 592-601.

Han Xiaoming, Liu Fang, Hu Bo, Zhang Fan. Space-Time Distribution Characteristics of the Focal Mechanism Type in Hetao Seismic Belt[J]. Journal of Jilin University(Earth Science Edition), 2015, 45(2): 592-601.

参考文献

[1] 胡幸平, 俞春泉, 陶开, 等. 利用P波初动资料求解汶川地震及其强余震震源机制解[J].地球物理学报, 2008, 51(6):1711-1718. Hu Xingping, Yu Chunquan, Tao Kai, et a1.Focal Mechanism Solutions of Wenchuan Earthquake and Its Strong Aftershocks Obtained from Initial P Wave Polarity Analysis[J].Chinese Journal of Geophysics, 2008, 51(6):1711-1718.

[2] 郭祥云, 陈学忠, 李艳娥.2008年5月12日四川汶川8.0级地震与部分余震的震源机制解[J].地震, 2010, 30(1):50-60. Guo Xiangyun, Chen Xuezhong, Li Yan'e. Focal Mechanism Solutions for the 2008 M_S8.0 Wenchuan Earthquake and Part of Its Aftershocks[J]. Earthquake, 2010, 30(1):50-60.

[3] 吕坚, 郑秀芬, 肖健, 等.2012年9月7日云南彝良M_S5.7、M_S5.6地震震源破裂特征与发震构造研究[J].地球物理学报, 2013, 56(8):2645-2654. Lü Jian, Zheng Xiufen, Xiao Jian, et al. Rupture Characteristics and Seismogenic Structure of the M_S5.7 and M_S 5.6 Yiliang Earthquakes of Sep 7, 2012[J]. Chinese Journal of Geophysics, 2013, 56(8):2645-2654.

[4] 曾祥方, 罗艳, 韩立波, 等.2013年4月20日四川芦山7.0地震:一个高角度逆冲地震[J].地球物理学报, 2013, 56(4):1418-1424. Zeng Xiangfang, Luo Yan, Han Libo, et al. The Lushan M_S 7.0 Earthquake on 20 April 2013:A High-Angle Thrust Event[J]. Chinese Journal of Geophysics, 2013, 56(4):1418-1424.

[5] 陈伟涛, 甘卫军, 万永革, 等.青藏高原东北缘4个强震重点监视区库仑破裂应力的近百年变化和危险性分析[J].吉林大学学报:地球科学版, 2013, 43(2):494-505. Chen Weitao, Gan Weijun, Wan Yongge, et al. Coulomb Failure Stress and Earthquake Risk Analysis of Several Four Earthquake Concerned Zone on Northeastern Tibetan Plateau in Nearly Hundred Year[J].Journal of Jilin University: Earth Science Edition, 2013, 43(2):494-505.

[6] 戴黎明, 李三忠, 楼达, 等.亚洲大陆主要活动块体的现今构造应力数值模拟[J].吉林大学学报:地球科学版, 2013, 43(2):469-483. Dai Liming, Li Sanzhong, Lou Da, et al. Numerical Modeling of Present-Day Structural Stress of Major Active Blocks in the Asian Continent[J]. Journal of Jilin University: Earth Science Edition, 2013, 43(2):469-483.

[7] 粱尚鸿, 李幼铭, 束沛镒, 等.利用区域地震台网波振幅比资料测定小震震源参数[J].地球物理学报, 1984, 27 (3):249-257. Liang Shanghong, Li Youming, Shu Peiyi, et al. On the Determining of Source Parameters of Small Earthquakes by Using Amplitude Rations of P and S from Regional Network Observations[J]. Chinese Journal of Geophysics, 1984, 27 (3):249-257.

[8] 刁桂苓, 于利明, 李钦祖.震源机制解的系统聚类分析:以海城地震序列为例[J].中国地震, 1992, 8(3):86-92. Diao Guiling, Yu Liming, Li Qinzu. Hierarchical Clustering Analysis of the Focal Mechanism Solution: Taking the Haicheng Earthquake Sequences for Example[J]. Earthquake Research in China, 1992, 8(3):86-92.

[9] 刁桂苓, 于利明, 宁杰远, 等.1989年大同震群的破裂特征[J].地球物理学报, 1993, 36(3):360-368. Diao Guiling, Yu Liming, Ning Jieyuan, et al. The Body Breaking Characteristic of Datong Earthquakes Warm at 1989[J]. Chinese Journal of Geophysics, 1993, 36(3):360-368.

[10] 陈天长, 崛内茂术, 郑斯华.利用P波初动和短周期P、S波振幅测定川滇地区地震震源机制解和应力场[J].地震学报, 2001, 23(4):436-440. Chen Tianchang, Shigeki Horiuch, Zheng Sihua. Earthquake Focal Mechanisms and Stress Field in Sichuan-Yunnan Area Determined Using P Wave Polarity and Short Period P and S Wave from Data[J]. Acta Seismologica Sinica, 2001, 23(4):436-440.

[11] 钟继茂, 程万正.由多个地震震源机制解求川滇地区平均应力场[J].地震学报, 2006, 28(4):337-346. Zhong Jimao, Cheng Wanzheng. Determination of Directions of the Mean Stress Field in Sichuan-Yunnan Region from a Number of Focal Mechanism Solutions[J]. Acta Seismologica Sinica, 2006, 28(4):337-346.

[12] 程万正, 阮祥, 张永久.川滇次级地块震源机制解类型及一致性参数[J].地震学报, 2006, 28(6):561-573. Cheng Wanzheng, Ruan Xiang, Zhang Yongjiu. Types of Focal Mechanism Solutions and Parameter Consistency of the Sub-Blocks in Sichuan and Yunnan Provinces[J]. Acta Seismologica Sinica, 2006, 28(6):561-573.

[13] 梅世蓉.中国的地震活动性[J].地球物理学报, 1960, 9(1):1-19. Mei Shirong.The Seismic Activity of China[J]. Chinese Journal of Geophysics, 1960, 9(1):1-19.

[14] 陈运泰, 顾浩鼎.震源理论基础:上册[M]. 北京:地震出版社, 2008. Chen Yuntai, Gu Haoding. Basis of Focal Theory:Volume One[M]. Beijing:Seismological Press, 2008.

[15] Zhu Lupei, Helmberger D V. Advancement in Source Estimation Techniques Using Broadband Regional Seismograms[J]. Bulletin of the Seismological Society of America, 1996, 86(5):1634-1641.

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