| 内,外动力作用与丽江7.0级地震的发生 |
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| 引用本文： | 赵洪声.内,外动力作用与丽江7.0级地震的发生[J].内陆地震,1999,13(2):97-104. |
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| 作者姓名： | 赵洪声 |
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| 作者单位： | 云南省地震局!昆明，650011 |
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| 摘 要： | 为了从动力学角度研究１９９６年２月３日丽江７．０级地震的孕育及发生过程。从分析该地震所处的滇西产大区的构造动力背景入手，揭示了近年来该地区中强、中小地震的异常活动特征和丽江附近形成的空区的孕震意义。尔后通过对多种外力的时空动态跟踪分析，发现震前中期尺度的涝旱剧变、短期尺度的气压突变及临震尺度的引潮力增大是促使孕震介质渐趋定直至破裂发震的重要因素。
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| 关 键 词： | 地震空区 引潮力 失稳破裂 动力作用 孕震 地震 |
INTERNAL,EXTERNAL DYNAMIC PROCESS AND OCCURRENCE OF THE LIJIANG EARTH QUAKE WITH MAGNITUDE 7.0 |
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| Zhao Hongsheng.INTERNAL,EXTERNAL DYNAMIC PROCESS AND OCCURRENCE OF THE LIJIANG EARTH QUAKE WITH MAGNITUDE 7.0[J].Inland Earthquake,1999,13(2):97-104. |
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| Authors: | Zhao Hongsheng |
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| Institution: | Seismological Bureau of Yunnan Province Kunming 650011 |
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| Abstract: | A Ms 7. 0 earthquake occurred in Lijiang on Feb. 3, 1996. In order to study its process ofgenesis and occurrence from the angle of dynamics,the tectonic dynamic background in the1arge region of Northwestern Yunnan where the Lijiang earthquake occurred is analyzed,andthe anomalous characteristics of the moderately, lightly strong.earthquake activity in thisarea and the seismogcnic meaning of thc gap that formed near Lijiang are revealed. Throughtracing and analyzing the time-space changes of many kinds of external forces, it is foundthat violent drought-waterlogging change of medium term, sudden air pressure change ofshort-term and impending-earthquake increase of tide-generating force are the principle fac-tors that cause seismogenic medium gradually to become unstable and earthquake t0 happen. |
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| Keywords: | Seismic gap Tide-generating force Waterlogging-drought-earthquake Air pressure Destabilization rupture |
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