地应力测量结果的校验和震前观测事实

广东省琼中和甘肃省永靖两地应力站的观测资料,在经过统计分析处理和力学校验后表明,1982年1月25日广东省崖县4.1级地震和1984年1月6日甘肃省武威5.5级两次地震前,相对稳定的区域应力场在孕震后期可能分别受到扰动。测区附加应力状态变化的共同特征是:(1)最大水平主应力曲线呈现非线性变化;(2)主应力方向发生系统偏转;(3)应力的变化趋势在震后迅速恢复稳定,但附加应力水平有所下降。      

Numerical simulation of spatial-temporal evolution characteristics of subsurface fluid based on strong body seismogenic model

Using finite element technique of the plane-strain problem in solid-liquid two-phase medium, we studied the characteristics of "field precursors" and "focus precursors" of subsurface fluid and their spatial-temporal evolution in case of dip-slip earthquake. The results show that: ① the change of ground fluid is slow and the anomaly is not prominent in the early period which is of elastic accumulation and non-linear; ②dilatancy emerges and anomaly focus mainly in the source region in the moderate period which is hardening and of local dilatancy. In the period the focus precursors emerge earlier than the field precursors; ③anomalies spread continuously in the source area and new regions with big anomaly emerge out of the source region in the middle-short period which is of large-scale dilatancy.     

Compressional elastic wave velocities of serpentinized pyroxenite at high pressures and high temperatures and its geological significance

Elastic wave velocity measurement in rocks at high pressures and high temperatures plays a key role in researching the state, properties and movement of the earth interior materials. Nowadays dehydration is believed to be as one of the most important reasons responsible for the abnormality of seismic velocity (Kern, 1982; Ito, 1990; Christensen, 1989; Popp, Kern, 1993; SONG, et al, 1996; ZHOU, 1998; ZHAO, et al, 1996). Geophysical, geochemical and mineralogical data have revealed that on…     

高速扩频微波组网技术在防震减灾中的应用

扩频微波技术是近几年发展起来的高新技术,是目前发展宽带网络技术的主要手段之一。采用扩频微波方式组网在地震系统还尚属首次。“京区扩频微波高速链路建设”是采用2－3Mbp/s速率扩频微波技术将中国地震局京区主要直属单位及北京市地震局的计算机网络互联起来,构成中国地震局北京城区计算机网络互联的计算机广域网扩频微波网络平台及中国地震局北京城区计算机网络信道骨干网。同时利用扩频微波建立了与中国科技网相连的信道,将京区各单位和全国各省（市）地震局的计算机网络接入因特网。     

ORACLE数据库系统在中国数字化地震台网的应用

中国数字化地震台网是全球数字化地震台网的一部分。设在国家地震局地球物理研究所ＣＤＳＮ的数据管理中心及其所属的北京、海拉尔、西安等１１个野外台站的地震信息管理系统的均采用ＯＲＡＣＬＥ数据。本文介绍了ＯＲＡＣＬＥ数据库在ＣＤＳＮ应用的情况。     

天山地震活动区地下水中碳同位素的初步研究

介绍了中国新疆维吾尔自治区地震局和乌兹别克斯坦共和国科学院地震研究所近 1 0年来地震科技合作在地下水碳同位素方面的基本研究成果。结合天山主要地震活动区 2 0 0余个水点的碳同位素观测资料 (其中乌鲁木齐地下水中碳同位素资料是第一次公布 ) ,分析了水中碳同位素的区域分布规律、来源及影响因素 ,探讨了碳同位素地震前兆异常的某些特征。     

中国地震科技文献数据库(英文版)

本文全面地描述了中国地震科技文献数据库(英文版)。该库在VAX 11/750小型计算机上,使用VAX数据检索、VAX公共数据字典软件进行设计。是一个联机检索系统。文献库收集五十余种中国编辑出版的科技期刊中,有关地震预报研究的论文。参考国內外文献著录准则,使文献记录格式标准化,通用化。一条记录长1898字节,其中文摘长1020字节。每年文献量约800余条。文献库磁带和软盘拷贝在国内外交换与出售。     

基于IP的安徽省地震视频会议系统研究

在中国地震局与各省地震局进行视频会议连通的基础上,安徽省地震局建设了基于IP的视频会议系统,实现了安徽省地震系统内部省局与地市局及台站的异地会商和协同工作,改变了安徽省地震局传统、低效的地震会商、会议、学术交流以及联动方式,具有一定的现实意义。     

2004年12月11日兰州陨石坠落的地震台网记录分析

利用甘肃省地震局在兰州市区及附近布设的数字地震台网的记录资料,对2004 年12 月11日兰州陨石坠落的过程进行了初步反演和分析。结果表明,23时36分23秒陨石进入兰州地区26km的上空,经历过一次较小的爆炸,然后向东北方向坠落,于23 时36 分42 秒在13 km高空发生最终爆炸解体,没有较大陨石体坠落地面。     

Analysis on the master event method and precise location of 1997 Jiashi strong earthquake swarm in western China

IntroductionEarthquakelocationisoneoftheoldestinverseproblemsinseismology.Preciseearthquakelocationisthebasisoftheseismicresearch.Theprecisionoftheearthquakelocationdependsonmanyfactors,suchasthequalityofthestationnetwork,theprecisionoftheseismicwavearrivaltimemeasured,andtheknowledgeaboutthecrustalvelocitystructureandsoon.AccordingtotheresearchmadebyZhao(1983),thehorizontallocationerroroftheeanhquakelocatedbythetraditionalabsolutemethodinthecentralareaofNorthChinaisabouttZkin,intheedgeregio…     

兰州数字遥测台网面波震级的对比研究

对比了兰州数字遥测地震台网所测定的速度震级与仿真位移震级、中国地震局平均震级之间的差异,分析了它们之间的相关程度、一致性、差异性。初步结果表明,兰州数字遥测台网测定的震级比中国地震局平均震级略高0．05,这种偏差在测量误差允许范围之内,并且数字台网资料直接测定的速度震级与位移震级的一致性较好,震级测定的连续性要求基本可以保证。     

中国地震系统电子政务初探

电子政务是传统行政管理方式的一场深刻变革，从管理的角度探讨了地震系统电子政务的应用，提出了中国地震系统进一步发展电子政务的建议：a)切实加强领导；b)注意应用环境；c)建立健全信息维护机制；d)切实做好网络安全保密工作。     

Seismo-tectonic divisions of strong earthquakes with M S≥7.0 and their tectonic geomorphology along Xianshuihe-Xiaojiang fault zone

Seismo-tectonic areas of historical strong earthquakes with M _S≥7 along Xianshuihe-Xiaojiang fault zone are divided, and their individual fault-pattern and tectonic geomorphology are analyzed. Those strong-earthquake areas are located in some special parts of the fault zone, where the major branch-faults of the fault zone form left stepping, parallel, and fork-like patterns. In the strong-earthquake areas structurally complicated basins are developed, such as pull-apart basins in fork-like area, in double stepping area, and in stepping and fork-like areas. Foundation item: Chinese Joint Seismological Science Foundation (9507424). Contribution No. 2001A003, Institute of Crustal Dynamics, China Seismological Bureau.     

Preliminary research to determine stress districts from focal mechanism solutions in Southwest China and its adjacent area

The method of sliding direction fitting is used to determine stress districts, taking the shear stress directions and ratios of shear stress to stress on fault planes given by focal mechanism solutions as the criteria to select focal mechanism solutions of one region and sorting out the earthquakes controlled by different tectonic stress fields, and then determining the stress districts from epicenter distribution of earthquakes. We call this method as step by step convergence method. By inversion analyzing of 297 focal mechanism solutions, we consider that Southwest China and its adjacent area can be divided into 5 stress districts, and we worked out directions of the three principal stresses and values of shape factor φin 5 stress districts.     

14C测定地质年代数据(六)及14C年代数据库

本文公布14C年代数据151个,存入国家地震局地质研究所14C年代数据库内。该数据库已验收通过。现录入数据资料1500条,对各地区、各层位的宏观年代分布及对避免野外重复性工作有着参考价值     

Rupture process of November 6, 1988, Lancang-Gengma, Yunnan, China, earthquake of M s=7.6 using empirical Green’s function deconvolution method

The empirical Green’s function deconvolution technique is applied to the November 6, 1998,M _s=7.6, Yunnan, China earthquake to study the rupture process of this event. An aftershock ofM _s=6.3 is taken as the empirical Green’s function. Recordings of these two events at six stations of China Digital Seismographic Network (CDSN) are employed. Deconvolution results show that this event is a relatively simple event. Directivity analysis indicates that the rupture was initiated at hypocenter and propagated bilaterally and early symmetrically towards the northwest and southeast directions with a total length of 70 km and a time duration of 19 s. The rupture velocity is estimated to be about 2.0 km/s. Contribution No. 98A01004, Institute of Geophysics, State Seismological Bureau, China. This study is supported by the Chinese Joint Seismological Science Foundation(95-07-411).     

On the relation of moderate-short term anomaly of earth resistivity to earthquake

IntroductionMany anomalies due to earthquake have been recorded in observation of earth-resistivity for30 years and over, which showed that there objectively existed the anomalies of each-resistivity.The crustal strUcture and medium conditions are quite complex, so the complexity of the temporal,spatial and intensive development of the anomalies is inevitable. Both of time and amplitUde ofanomalies among some stations near an epicenter are different (even among different observational directi…     

中国地震代表团访问埃及

２０００年８月７～１６日,以中国地震局副局长何永年为团长的中国地震代表团一行６人访问了埃及。这是中国地震局地震代表团首次访问埃及,也是乎次访问非洲国家。文章较详细地介绍了埃及的地震监测、地震科学研究、研究机构及其职能等方面的情况。     

Study of characteristics of long-period ground motion response spectra by using broad-band records of the Chinese digital Seismograph Network

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北京市防震减灾工作的进展

北京市既是全国政治文化的中心,也是国家地震重点监视区之一。市政府非常重视北京市的防震减灾工作,于１９９６年１０月成立的由国家地震局和北京市政府双重管理的北京市地震局负责北京市防震减灾的管理工作。１年来,北京市已健全了各级防震减灾机构,防震减灾工作取得了较大的进展。该文综合介绍了北京市防震减灾工作的进展,包括：健全和完善组织机构;法规建设;北京市的抗震设防;北京市的地震监测预报;防震减灾的宣传教育及筹建北京市防震减灾中心等。