Distribution of empirical recurrence intervals for segment-rupturing earthquakes on active faults of the Chinese mainland   总被引：2，自引：0，他引：2  

闻学泽 《地震学报(英文版)》1999,12(6):667-675

IntroductionInassessingtheprobabilitiesoftime-dependentandlong-termseismichazardsforsegmentsofactivefaults,itisnecessarytohavetheprobabilitydensity,f(O,fordescribingtherecurrenceintervaldistributionforsegment-rupturingearthquakes.Fromf(nandthefollowingequation,theconditionalprobability,pc,whichincreaseswiththetime,Te,elapsedsincethelatestearthquake,isabletobecalculated(Nishenko,Buland,1987,WorkingGrouponCaliforniaEarthquakeProbabilities,1995;Wen,1995,1998)fwhereATisthetimeintervalforthefor…  相似文献   

中国大陆现今地壳垂直运动概貌及其地球动力学的某些特征   总被引：9，自引：0，他引：9  

杨国华  巩曰沐 《测绘学报》1994,23(3):184-189

本文根据均衡理论，编绘了我国大陆地区现今地壳垂直运动速率图（不包括台湾、海南等岛屿）。结果显示，我国大陆地区的运动特征为“南和或北降”、“东弱西强”；且明显地受印度板块和太平洋板块所控制，以印度板块的作用为最强烈。  相似文献   

中国大陆西部及邻区各地震活动区地震活动关系研究          下载免费PDF全文

李英  赵卫明  盛菊琴 《地震工程学报》2004,26(2):154-161

利用相关函数分析方法对1900年以来缅甸转换构造区、滇西南旋转构造域和兴都库什中深源地震区的7．0级以上地震与中国大陆西部及邻区的其它各地震活动区7．0级以上地震的相互关系进行研究。结果表明：缅甸转换构造区、滇西南旋转构造域和兴都库什中深源地震区的地震活动与其它各地震活动区的地震活动在时间和空间上存在一定的对应关系。这一结果对中国大陆西部及邻区强震的预报有一定的意义。  相似文献   

A preliminary research establishing the present-time intraplate blocks movement model on the Chinese mainland based on GPS data   总被引：4，自引：0，他引：4  

Shuo-Yu Zhou  Yue-Gang Zhang  Guo-Yu Ding  Yun Wu  Xiao-Jun Qin  Shun-Ying Shi  Qi Wang  Xin-Zhao You  Xue-Jun Qiao  Ping Shuai  Gan-Jin Deng 《地震学报(英文版)》1998,11(4):403-412

The Chinese mainland is regarded as the best area for studying the continental crustal movement and dynamics. In the past, based on the ground surface observation, it was very difficult to study the movement of the intraplate blocks within a range of larger space and a time scale of several years quantitatively. In this paper, a method of calculating the Euler vectors of present-time motion among blocks by using Cardan angles has been given completely based on two periods of GPS repetition measurement data of the National Ascending Plan of China (NAPC) — the study and application of current crustal movement and geodynamics in 1994 and 1996. A present-time blocks movement model on the Chinese mainland (PBMC-1), which describes the motion of seven blocks—Tibet, Chuan-Dian, Gan-Qing, Xinjiang, South China, North China and Heilongjiang block, is established preliminarily. The velocity field of the relative motion among the intraplate blocks and boundary motion in the Chinese mainland are firstly given within several years time scale. It is shown by the results calculated with the model that the velocity-rate of each block is reduced gradually from the south to north and from the west to east, and the motion direction changes gradually from NNE to E, even SEE or SE. The collision of Indian plate plays a leading role in the movement of the intraplate blocks in the Chinese mainland, while the motion manner and velocity-rate of block boundary zone (fracture zone) depend on the motion of every block again. The present-time motion of a time scale of several years computed with the model is not only largely consistent with the average motion of a time scale of several million years derived from geology, but also very coincident with the results of geophysical and astronomic observation. It is shown preliminarily that the observed results of space geodesy techniques such as GPS etc. are capable of discovering the crustal movement at present. This study is supported by the National Natural Science Foundation of China (NNSFC), National Ascending Plan of China (NAPC) and Chinese Joint Seismological Science Foundation (CJSSF).  相似文献   

中国大陆地震活跃期和全球部分地震带强震活动的相关性研究   总被引：4，自引：0，他引：4  

李献智  吕梅梅 《中国地震》1996,12(2):155-162

对全球部分地震带强震活动的研究表明，中国大陆地震活跃期与全球某些地震带强震活动呈一定程度的正相关或负相关，且有些地震带的强度震超前于中国大陆活动或平静，因此，可以利用相关地震带的强震活动和某些地震带的超前性，预测中国大陆的地震活动趋势及判定中国大陆的地震活跃期。  相似文献   

用地球位模型和GPS/水准数据确定我国大陆似大地水准面   总被引：27，自引：0，他引：27  

魏子卿  王刚 《测绘学报》2003,32(1):1-5

用地球位模型和GPS/水准数据确定了我国大陆地区的似大地水准面。采取的方法是,对于每一个GPS/水准点,用地球位模型计算其高程异常值,并与其GPS/水准实测高程异常值比较,得到计算值的改正数,以此改正附近15′×15′格网点上用地球位模型计算的高程异常。方法的实质是将地球位模型计算的似大地水准面拟合于GPS/水准实测的似大地水准面。计算共使用了遍布大陆的950多个GPS/水准点,点间距大约100km。得到的15′×15′似大地水准面的精度,就全国而言,平均好于±0.5m,105°E以东地区接近±0.3m,以西地区接近±0.6m,青藏地区接近±0.5m。  相似文献   

中国大陆Pn波速度结构与强震孕育的深部背景   总被引：5，自引：2，他引：5       下载免费PDF全文

汪素云  许忠淮  裴顺平 《地球物理学报》2003,46(6):779-785

在作者以往工作的基础上，增加了中国地震年报（1997～1998年）、朝鲜以及我国各区域地震台网的数据，使Pn到时数据增加到近14万条，从中选取符合反演条件的8043次地震在581个地震台站上记录到的Pn射线99440条,重新作了中国大陆Pn波速层析成像,空间分辨率达到3°×3°. 文中将Pn波速度横向变化与活动地块的划分进行了对比,结果表明: Pn波速度横向变化与Ⅰ级活动地块区之间关系密切，大致以105°E为界，西部地区速度以正异常为主，其中西域地块区速度正异常最大，其次是青藏地块区，而滇缅地块区为负异常区；东部地区速度以负异常为主，华北地块区速度负异常最大，其次是东北亚地块区. 西部的地块区上地幔顶部Pn波速度各向异性的平均快波速度方向大体为NWW—SEE向;东部的地块区大体为NNW—SSE向，大致与相应的张应力优势方向一致. Pn波速度横向变化与强震活动间的关系也较明显，所有MS≥7.0的强震大部分发生在上地幔顶部Pn波速度的低速异常区上面的地壳内，少数发生在高、低速区域的过渡地带或两个高速区之间的相对低速部分.  相似文献   

A discussion on Corioli force effect and aftershock activity tendency of the M=8.1 Kunlun Mountain Pass earthquake on Nov. 14, 2001     

吕坚  高建华  刘吉夫  胡翠娥  黄双凤 《地震学报(英文版)》2003,16(4)

Introduction An M=8.1 earthquake occurred to the west of the Kunlun Mountain Pass on November 14, 2001 (Kunlun Mountain earthquake for short). It is the largest earthquake during the latest 50 years in Chinese mainland since the 1951 Dangxiong, Tibet M=8.0 earthquake, and it broke the status that there had not occurred any M7.0 earthquake during the subsequent 4 years since the 1997 Mani, Tibet M=7.5 earthquake. Hereafter, the preparation and evolution process of large earthquakes, the v…  相似文献   

Current horizontal strain field in Chinese mainland derived from GPS data   总被引：3，自引：0，他引：3  

杨国华  李延兴  韩月萍  胡新康  巩曰沐 《地震学报(英文版)》2002,15(4):351-362

Introduction In the years when the reliable data could not be obtained and in the analysis of strain property and magnitude in history, the intensity, property and activity pattern of strain field were mainly inferred on the bases of geometric characters of surface traces and behaviors (especially the faults) as well as the characteristics of petrology (XIE, et al, 1993; Molnar, Tapponnier, 1975, 1977; Tapponnier, Molnar, 1977; FU, et al, 2000). However, they are the averaged results accumu…  相似文献   

2001年新疆-青海交界8.1级特大地震的特殊性、发震背景及对未来地震形势估计   总被引：2，自引：0，他引：2  

孙加林 《国际地震动态》2002,(9):11-13

2001年11月14日新疆－青海8．1级特大地震，是1951年当雄8．0级特大地震后，整整50年大陆上首发8级特大地震，它的发生虽然没有造成较大经济损失和人员伤亡，但它的科学意义和学术价值超过过去几十年来任何一次强震，它打破了我们对地震活跃期的划分和许多传统认识，同时对如何判断未来地震大形势提出了重大课题。  相似文献