孕震过程中次声波的产生机理
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摘要
提出了一个临震次声波产生的机理模型,认为孕震末期地质结构动力行为引起的地表变形与空气耦合运动导致可观测次声波．并以日本地震板块为研究对象,建立其数值模型,采用二维瞬态有限元分析方法,分层考虑不同深度地质参数,模拟了日本东北部地区地表的运动,计算了地表位移及次声波压力变化曲线,模拟出了临震次声波,次声信号波形特征、频率范围与实际观测基本一致,结果表明孕震一次声机理模型是合理的．
A mechanism model of infrasound producing in earthquake incubating was proposed, in which interaction between atmosphere and deformation of Earth surface generated by dynamic behavior of geologic bodies in the final stage of earthquake incubation causes the observable infrasound. As an example to verify the model of geological behavior an earthquake in the Northeast area of Japan was modeled numerically and analyzed by two dimensional finite element method (FEM). A layer geological model and effect of the Pacific subducting plate were included in the numerical model. Based on the dynamic coupling theory between structures and fluids, infrasound was obtained by numerical simulations. Good agreement between the observed and the simulated suggests that the proposed model is reasonable.
A mechanism model of infrasound producing in earthquake incubating was proposed, in which interaction between atmosphere and deformation of Earth surface generated by dynamic behavior of geologic bodies in the final stage of earthquake incubation causes the observable infrasound. As an example to verify the model of geological behavior an earthquake in the Northeast area of Japan was modeled numerically and analyzed by two dimensional finite element method (FEM). A layer geological model and effect of the Pacific subducting plate were included in the numerical model. Based on the dynamic coupling theory between structures and fluids, infrasound was obtained by numerical simulations. Good agreement between the observed and the simulated suggests that the proposed model is reasonable.
引文
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[7]高祥林,罗焕炎,平原和朗．日本俯冲带应力产生与传播的数值模拟[J]．地震地质,1994,16(2):97-108． GAO Xiang-lin, LUO Huan-yan, KAZURO Hirahara. Numerical modeling of stress generation and transfer caused by the Japanese subduction zone[J]. Seismology and geology, 1994, 16(2): 97-108. (in Chinese)
[8]徐纪人,赵志新,河野方辉,等．日本南海海槽地震区域应力场及其板块构造力学特征[J]．地球物理学报,2003,46 (4):488-494． XU Ji-ren, ZHAO Zhi-xin, KONO Yoshiteru, et al. Regional characteristics of stress field and its dynamics in and around the nanhai trough, Japan[J]. Chinese Journal of Sinica, 2003, 46(4): 488-494. (in Chinese)
[9] KAZURO H. Interplate earthquake fault slip during periodic earthquake cycles in a viscoelastic medium at a subduction zone[J]. Pure Appl Geophys, 2002, 159: 2201-2220.
[10] SATO K. Stress and displacement fields in the northeastern Japan Island arc as evaluated with three-dimensional finite element method and their tectonic interpretations[J]. Tohoku Geophys Journal, 1988, 31: 51-99.
[11]梅世蓉,梁北援,朱岳清．唐山地震前兆机制的数值模拟[J]．中国地震,1989,5(2):27-34． MEI Shi-rong, LIANG Bei-yuan, ZHU Yue-qing. Digital simulation on precursory mechanism of the 1976 Tangshan earth quake[J]. Earthquake Research in China, 1989, 5(2): 27-34. (in Chinese)
[12] LI Jun-zhi, BAI Zhi-qiang, CHEN Wei-sheng, et al. Strong earthquakes can be predicted: a multidisciplinary method for strong earthquake prediction[J]. Natural Hazards and Earth System Sciences, 2003, 3: 703-712.
[2] GARCESM. Infrasonic signals generated by volcanic eruptions[J]. IEEE 2000 International, 2000, 3(7): 24-28.
[3] JOHNSON J B. Generation and propagation of infrasonic airwaves from volcanic explosions[J]. Journal of Volcanology and Geothermal Research, 2003, 121: 1-14.
[4]谢金来,谢照华．1993年7月12日日本北海道地震次声波[J]．声学学报,1996,21(1):55-61． XIE Jin-lai, XIE Zhao-hua. Infrasound waves caused by earthquake on 12 July 1993 in Japan[J]. Acta Acustica, 1996, 21 (1): 55-61. (in Chinese)
[5]夏稚琴,胡争杰,郑菲．震前次声波信号特征研究[J]．北京工业大学学报,2005,31(5):461-470． XIA Ya-qin, HU Zheng-jie, ZHENG Fei. Prediction of transportation demand for Olympic spectator[J]. Journal of Beijing University of Technology, 2005, 31(5): 461-470. (in Chinese)
[6] DOYLE JF. Wave propagation in structure[M]. UK: Springer, 1997.
[7]高祥林,罗焕炎,平原和朗．日本俯冲带应力产生与传播的数值模拟[J]．地震地质,1994,16(2):97-108． GAO Xiang-lin, LUO Huan-yan, KAZURO Hirahara. Numerical modeling of stress generation and transfer caused by the Japanese subduction zone[J]. Seismology and geology, 1994, 16(2): 97-108. (in Chinese)
[8]徐纪人,赵志新,河野方辉,等．日本南海海槽地震区域应力场及其板块构造力学特征[J]．地球物理学报,2003,46 (4):488-494． XU Ji-ren, ZHAO Zhi-xin, KONO Yoshiteru, et al. Regional characteristics of stress field and its dynamics in and around the nanhai trough, Japan[J]. Chinese Journal of Sinica, 2003, 46(4): 488-494. (in Chinese)
[9] KAZURO H. Interplate earthquake fault slip during periodic earthquake cycles in a viscoelastic medium at a subduction zone[J]. Pure Appl Geophys, 2002, 159: 2201-2220.
[10] SATO K. Stress and displacement fields in the northeastern Japan Island arc as evaluated with three-dimensional finite element method and their tectonic interpretations[J]. Tohoku Geophys Journal, 1988, 31: 51-99.
[11]梅世蓉,梁北援,朱岳清．唐山地震前兆机制的数值模拟[J]．中国地震,1989,5(2):27-34． MEI Shi-rong, LIANG Bei-yuan, ZHU Yue-qing. Digital simulation on precursory mechanism of the 1976 Tangshan earth quake[J]. Earthquake Research in China, 1989, 5(2): 27-34. (in Chinese)
[12] LI Jun-zhi, BAI Zhi-qiang, CHEN Wei-sheng, et al. Strong earthquakes can be predicted: a multidisciplinary method for strong earthquake prediction[J]. Natural Hazards and Earth System Sciences, 2003, 3: 703-712.
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