有关科里奥利力效应与昆仑山口西8.1级地震余震活动趋势的讨论s   总被引：3，自引：0，他引：3       下载免费PDF全文

吕坚  高建华  刘吉夫  胡翠娥  黄双凤 《地震学报》2003,25(4):432-440

根据物理学中的科里奥利力定义和计算原理，在对中国大陆20次7.5级以上特大地震余震强度与科里奥利力效应关系的统计研究基础上，重点对2001年11月14日昆仑山口西8.1级地震时所受到的科里奥利力情况进行了研究，并以此来讨论该地震后期的余震活动趋势．结果表明: ① 利用科里奥利力效应预测中国大陆特大地震的余震强度是一个有效的方法．对于左旋走滑断层和上盘错动方向通过震源子午面右侧（向北看）的逆断层，其科里奥利力效应是使断层两盘相互拉离，它降低了断层错动时断层面上的摩擦阻力，地震能量主要在主震时充分释放，故余震强度小；对于右旋走滑断层，其科里奥利力效应是使断层两盘相互挤压，它增加了断层错动时断层面上的摩擦阻力，不利于主震能量的充分释放，所以余震强度大；② 2001年11月14日昆仑山口西8.1级地震的发震断层错动以左旋走滑为主，受到的科里奥利力使断层两盘相互拉离，大小约为0.06 MPa．经过类比分析后认为，该地震后期的余震活动水平不会太高，整个序列的最大余震震级估计为6级左右．   相似文献   

中国大陆现今地壳运动的动力学机制   总被引：6，自引：4，他引：6       下载免费PDF全文

叶正仁  王建 《地球物理学报》2004,47(3):456-461

用有限元方法对中国大陆及邻区地壳与岩石圈运动进行动力学模拟. 以一个黏性薄板（牛顿黏滞、非牛顿黏滞）比拟中国大陆岩石圈，通过解力平衡方程得到中国大陆地壳相对于欧亚板块的运动速度分布，并与最新观测的GPS测量资料比较. 结果表明，造成中国大陆及邻区现今地壳运动及形变的主要动力来源为印度-欧亚板块碰撞及中国西部地区，特别是青藏高原的巨大重力位能. 相对而言，前者的贡献大于后者. 同时，构成中国大陆岩石圈的介质具有较强的非均匀流变特性，呈现出分块特征.  相似文献   

An overview on shallow strong earthquake activity and earthquake live losses of Chinese mainland in the centenary from 1901 to 2001     

傅征祥  刘桂萍  邵辉成  丁香 《地震学报(英文版)》2005,18(4):392-401

Introduction It is well known that China locates in the southeastern part of Eurasian Plate, which subjects to the action of westward subducting of Pacific Plate and Philippine Sea Plate, and northward col- lision of Indian Plate. So China is a country with strong seismicity. There are two kinds of earth-quake activities in China. In the Chinese mainland most of the earthquakes belong to the intraplate ones, and in Taiwan of China belong to interplate ones. According to the statistics 9…  相似文献   

A Simplified Approach to Earthquake Risk in Mainland China     

Qi-fu Chen  Hongliang MI  Jing Huang 《Pure and Applied Geophysics》2005,162(6-7):1255-1269

There are limitations in conventional earthquake loss procedures if attempts are made to apply these to assess the social and economic impacts of recent disastrous earthquakes. This paper addresses the need to develop an applicable model for estimating the significant increases of earthquake loss in mainland China. The casualties of earthquakes were studied first. The casualties of earthquakes are strongly related to earthquake strength, occurrence time (day or night) and the distribution of population in the affected area. Using data on earthquake casualties in mainland China from 1980 to 2000, we suggest a relationship between average losses of life and the magnitude of earthquakes. Combined with information on population density and earthquake occurrence times, we use these data to give a further relationship between the loss of life and factors like population density, intensity and occurrence time of the earthquake. Earthquakes that occurred from 2001 to 2003 were tested for the given relationships. This paper also explores the possibility of using a macroeconomic indicator, here GDP (Gross Domestic Product), to roughly estimate earthquake exposure in situations where no detailed insurance or similar inventories exist, thus bypassing some problems of the conventional method.  相似文献   

中国大陆构造应力应变场现今年变化特征的数值模拟     

陈连旺  杨树新  谢富仁  陆远忠  郭若眉 《中国地震》2005,21(3):341-349

根据中国大陆活动地块构造、全新世活动断裂、分辨率为1°×1°的中国大陆地壳波速结构等,建立了中国大陆构造应力应变场的二维有限元模型。利用GPS实测资料,导出现今中国大陆构造应力场年平均变化的有限元模型位移速率边界条件,进而通过数值模拟研究了中国大陆现今构造应力应变场的年变化图像的基本特征。研究结果表明:(1)中国大陆现今构造变形的总体特征受控于与周边板块的相互作用,其中印度板块起着主要控制作用。中国大陆西部具有向NNE方向的位移速率,其值在碰撞边界最大,由南至北、由西到东,向北的位移分量逐步减小而向东的位移分量逐步增大;东部地区存在着整体的向东运动,且具有一定的向南运动分量。(2)中国大陆现今地壳应力场近年来处于增强的进程中,且呈现了以青藏高原为中心向东辐射的基本形态。总体特征与中国大陆背景应力场相似,表明了中国大陆现今构造运动的继承性。(3)最大主应变具有明显的西高东低特征,西部构造活动强烈,而东部相对较弱。活动断裂带均为最大主应变的高值区,而它们所围限的活动地块内部的应变相对较小。(4)川滇地区的应力应变场具有特殊性,并非由单纯的板块边界碰撞所控制,周围活动地块的运动、下地壳或上地幔的物质流动以及特殊的边界构造形态(如喜马拉雅东构造结)的作用,均可能成为其区域构造应力应变场的控制因素。  相似文献   

The structure features of stick-slip mechanism of the strike-slip earthquake generating structure in the interior of the Chinese mainland     

WEN LIN HUAN XIAO DONG ZHANG ZHAO YI SONGInstitute of Geophysics  State Seismological Bureau  Beijing  China 《地震学报(英文版)》1997,10(3):287-297

ＴｈｅｓｔｒｕｃｔｕｒｅｆｅａｔｕｒｅｓｏｆｓｔｉｃｋｓｌｉｐｍｅｃｈａｎｉｓｍｏｆｔｈｅｓｔｒｉｋｅｓｌｉｐｅａｒｔｈｑｕａｋｅｇｅｎｅｒａｔｉｎｇｓｔｒｕｃｔｕｒｅｉｎｔｈｅｉｎｔｅｒｉｏｒｏｆｔｈｅＣｈｉｎｅｓｅｍａｉｎｌａｎｄＷＥＮＬ...  相似文献   

中国震例数据库及其应用系统设计     

严蔼芬  张肇诚 《中国地震》1995,11(3):293-298

本文简单介绍了中国震例数据库及其应用系统的软件设计。该系统是用网状数据库管理系统ＶＡＸＤＢＭＳ的实现的，目前数据库内存入１９９６年后我国大陆５级以上地震６０个震例报告的详细资料，系统具有快速检索、统计计算及图形绘制等功能，是震例分析及有关研究的有关手段，该系统于１９９１年１２月通过专家鉴定。  相似文献   

The depth of Moho in the mainland of China   总被引：1，自引：0，他引：1  

曾融生  孙为国  毛桐恩  林中洋  胡鸿翔  陈光英 《地震学报(英文版)》1995,8(3):399-404

ＴｈｅｄｅｐｔｈｏｆＭｏｈｏｉｎｔｈｅｍａｉｎｌａｎｄｏｆＣｈｉｎａＲｏｎｇ－ＳｈｅｎｇＺＥＮＧ；（曾融生）Ｗｅｉ－ＧｕｏＳＵＮ；（孙为国）Ｔｏｎｇ－ＥｎＭＡＯ（毛桐恩）ＺｈｏｎｇＹａｎｇＬＩＮ；（林中洋）Ｈｏｎｇ－ＸｉａｎｇＨＵ；（胡鸿翔）ａｎｄＧ...  相似文献   

Lg coda Q0 value and its relation with the tectonics in Chinese mainland and adjacent regions     

苏伟吴建平  明跃红王椿镛 《地震学报(英文版)》2006,19(2):136-144

We have collected 432 vertical component records from 45 stations of new CENC （China Earthquake Network Center） in Chinese mainland and adjacent regions. These records were used to calculate Q0 （Q at 1Hz） and η values of Lg coda from each station by the stack spectral ratio （SSR） method. Then the tomography method was applied to obtaining lateral variation of Q0 and η values in Chinese mainland and adjacent regions. The result indicates that Q0 value varies between 150 and 600 in the studied areas. Yunnan, southwest Sichuan, and northwest Myanmar show the lowest Q0 value （Q0〈240） and the crust of these regions is characterized by complicated crack and strong hydrothermal activity. The highest Q0 value （Qo〉510） exists in the border of southern Mongolia, Alxa and Ordos block. The η value varies between 0.45 and 0.75 in Chinese mainland and its adjacent regions.  相似文献   

Study on the regional deviation of the macroscopic epicenters from relevant epicenters by rapid determination in Chinese mainland     

刘吉夫  王晓青  陈颙  黄辅琼 《地震学报(英文版)》2006,19(1):39-43

Introduction The current earthquake damage and losses assessment is based on the parameters obtained from rapid determination of earthquake location. It has been proved that there exist uncertainties of the rapidly determined parameters. For example, the deviation of fast determined magnitude from the magnitude determined by the international common technique obeys the normal distribu-tion, and such deviation is decreasing year after year with improvement of networks performance (MENG, 1994;…  相似文献