| 研究地震破裂过程的一种新的方法及其应用 |
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| 引用本文： | 张之立,方兴.研究地震破裂过程的一种新的方法及其应用[J].地震学报,1988,10(1):1-10. |
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| 作者姓名： | 张之立 方兴 |
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| 作者单位： | 国家地震局地球物理研究所 |
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| 摘 要： | 本文研究了1981年1月23日发生在四川道孚的Ms=6.8级地震和1983年2月13日发生在新疆乌恰的Ms=6.2级地震以及与它们相连系的有关地震的破裂扩展过程。本文除用体波资料研究外,主要是从断裂扩展和终止的角度,用单断裂和断裂系的力学模式从理论和试验方面分别模拟了这些地震破裂扩展的全过程,并研究了这些地震序列本身以及它们和周围地震的空间分布关系。因此提出了能更可靠地确定地震破裂面的几何尺度,确定地震断层的活动段和闭锁段的位置和长度的一种新方法,简称为扩展过程的拐折点方法。该方法还能解释和判断在不同断层部位发生的那些地震所具有的震源力学特征。并初步将该方法应用于鲜水河断裂带的地震趋势分析。
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| 关 键 词： | 地震破裂过程 扩展分支 拐折点方法 活动段和闭锁段 连通区 |
A NEW METHOD TO STUDY EARTHQUAKE FRACTURE PROCESS AND ITS APPLICATIONS |
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| Affiliation: | Institute of Geophysics, State Seismological Bureau |
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| Abstract: | In this paper, the fracture propagation processes of the Daofu, Sichuan earthquake (Ms -6.8) which occurred on Jan. 23 of 1981 and the Wuqia, Xinjiang earthquake (Ms = 6.2) which occurred on Feb. 13 of 1983 as well as their relevant fore and after-shocks are analysed by using body wave data. Based on the view point that the earthquake fracture processes are relative to the propagation and stop mechanism of faults, so the mechanical models of a single fault and a series of faults are presented to simulate the propagation and stop processes of earthquake faults and to study the space distribution relations among events of the earthquake sequence themselves as well as among an earthquake and its surrounding earthquakes. Upon the basis of theoretical and practical analysis, a more reasonable method to determine the fra-cure length of an earthquake fault and to determine the location and lengths of the active segments and locked segments of a pre-existing fault is presented in this paper. With this method the mechanical characteristics of earthquake sources occurring at different portions of the faults can also be explained and determined. Its application is preliminarily to the tendency of earthquake occurrence of the Xianshuihe fault in this paper. |
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