“东亚大陆地球动力学研究”计划申报进展顺利──中美地震专家同意合作开展研究

“东亚大陆地球动力学研究”计划申报进展顺利──中美地震专家同意合作开展研究应国家地震局地球物理研究所邀清，美国南加州地震中心（ＳＣＥＣ）郦永刚（Ｙ．Ｇ．Ｌｉ）博士于１９９６年４月１９－２０日在国家地震局地球物理研究所进行了力期丙天的工作坊同。访同期间...     

震源物理实验室“八五”技术改造

由国家地震局地球物理研究所承担的“ＭＴＳ－１００Ｔ伺服试验机改造”课题,对震源物理实验室进行了实验系统改造。该文简要介绍了该课题所完成的主要工作及其应用情况,包括：ＭＴＳ－１００Ｔ伺服试验机控制系统、１６通道高速数据采集系统、激光散斑图干涉仪。     

大陆地震与减轻地震灾害国际培训班在北京举办

由国际大地测量学与地球物理学联合会（ＩＵＧＧ）和中国地震局（ＣＳＢ）联合举办的“Ｉ－ＵＧＧ／ＣＳＢ大陆地震与减轻地震灾害国际培训班”于１９９８年１０月４～１４日在北京举办。本次国际培训班由中国地震局地球物理研究所承办。培训班得到了国际地震学和地球内部...     

一项全球性的国际合作计划：国际地震观测期计划

一项全球性的国际合作计划──国际地震观测期计划陈培善（国家地震局地球物理研究所）一、概况国际地震观测期（ＩＳＯＰ）是一项全球性的广泛的国际合作计划。即在指定观测期内（１９９４－１９９６），在改善台站观测质量方面和对来自全球地震台网的高质量的观测数据进...     

油气田开发与地球物理技术研讨会在京召开

2009年2月26～27日,中国科学院地质与地球物理研究所与中国石油天然气股份有限公司辽河油田分公司于北京吐哈宾馆召开了“油气田开发与地球物理技术研讨会”,会议由中国科学院地质与地球物理研究所油气综合地球物理重点实验室主持召开．共60余位代表参加了会议．     

地震目录(1994年6-8月)<

地震目录（１９９４年６－８月）陈培善（中国北京１０００８１国家地震局地球物理研究所）本目录中的地震参数来自＂中国地震台临时报告＂（简称＂月报＂），其中国内及邻区给出Ｍ≥４．７的事件，全球给出Ｍ≥６的事件．＂月报＂由国家地震局地球物理研究所九室按月做出...     

延庆—怀来盆地地震预测研究

本文阐述了英国地质调查所与国家地震局地球物理研究所在北京西北延庆－怀来盆地进行地震学合作研究的过程和取得的成果。     

第3届国际地学层析成像学术会议

第３届国际地学层析成像学术会议第３届地学层析成像国际学术讨论会于１９９５年１１月８－１０日在日本东京召开．会议由日本勘探地球物理学会（ＳＥＧＪ）和美国勘探地球物理学会（ＳＥＧ）主办．来自日本、美国、中国、澳大利亚、加拿大、英国、芬兰、法国、印度尼西亚...     

1998年5月份全球M≥5.0地震动态

根据中国地震局地球物理研究所中国数字地震台网数据管理中心（ＣＤＳＮＤＭＣ）从美国地震学合作研究会数据管理中心（ＩＲＩＳＤＭＣ）得到的资料,１９９８年５月份全球范围内共发生Ｍ≥５．０地震９２次（见附表）。其中,Ｍ≥６．０地震１３次,Ｍ≥７．０地震１次,...     

1997年9月份全球M≥5.0地震动态

１９９７年９月份全球Ｍ≥５．０地震动态根据国家地震局地球物理研究所中国数字地震台网数据管理中心（ＣＤＳＮＤＭＣ）从美国地震学合作研究会（ＩＲＩＳ）地震数据管理中心得到的资料,１９９７年９月份全球范围内共发生Ｍ≥５．０地震７５次（见附表）,其中Ｍ≥６．...     

藏北改则县别若则错活动断裂的发现及其地质意义

由于调查研究资料有限,目前对藏北高原内部近EW向的伸展变形样式和具体调节机制一直存在诸多争议。最新开展的地表调查在藏北高原西部的别若则错新发现了1条长约20km、走向近NNW的走滑断裂。该断裂表现出断塞塘、水系错动及断层崖等典型的走滑断裂变形标志。水系错动及构造地貌显示,别若则错断裂是以右旋走滑运动为主、兼具明显正断分量的张扭性断层,是高原内部近EW向伸展变形的产物。通过与羌塘古大湖进行对比分析,认为该断裂错断的最新地貌体是晚更新世的冲洪积扇,未错断全新世扇体,且断崖坡角已显著变缓,表明其最新活动时间可能为晚更新世。综合分析地表调查和遥感影像的错断位移恢复结果,发现最新一次断裂活动的最大右旋走滑位移约2～3m。晚更新世早—中期冲洪积扇体的累积最大右旋走滑位移约44m,垂直错动约2m,由此推测该断裂晚第四纪以来走滑速率约1mm/a,显示弱走滑变形特征。别若则错断裂近NNW的走向与印度和欧亚板块碰撞的主压应力轴(σ1)的夹角约30°,而已发现的区域性共轭走滑断裂与σ1呈约60°～75°的较大夹角,两者显著不同,表明藏北地区共轭走滑断裂带的组合方式可能存在不同的样式:一种是钝角,可能与拉萨和羌塘地体内的剪切作用或块体挤出有关;另一种是锐角,可能代表着新生破裂特征,推测其可能与高原内部近SN向正断层的N向的延伸有关,其成因机制仍需进一步研究。     

Preliminary Results of Anthropogenic Seismicity Monitoring in the Region of Song Tranh 2 Reservoir,Central Vietnam

Song Tranh 2 hydropower plant and the reservoir containing backed up water are located in the Quang Nam province (Central Vietnam). The region experiences unusual seismic activity related to the reservoir impoundment, with earthquakes of magnitude up to 4.7. In result of cooperation between the Institute of Geophysics, Vietnam Academy of Sciences and Technology and the Institute of Geophysics, Polish Academy of Sciences a seismic network has been built to facilitate seismic monitoring of the Song Tranh 2 area. The network, operating since August 2013, consists of 10 seismic stations. Here we show that the network is sufficient for advanced data processing. The first results of monitoring of the earthquake activity in Song Tranh 2 area in the period between 2012 and 2014, especially the completeness of catalogs, study and comparisons between water level and the seismic activity suggest direct connection between reservoir exploitation and anthropogenic seismicity.     

V6多功能系统及其在CSAMT勘查应用中的效果

地球物理多功能探测系统V6是中国科学院地质与地球物理所2000年底从加拿大凤凰公司引进的新仪器，它具有频点多（62频点系列），抗干扰能力强，发射功率大，A/D转换16位置及发射与接收信号GPS（Globe Position System)时钟同步等特点，能有效地提高纵向分辩率和测量信号的信噪比，为浅层精细勘探提供了保障。V6系统在牛栏山水源八厂标准剖面的试验，山东莱芜业庄矿突水勘查工作等充分证明，V6系统能较准确地确定目标的层深度，结合地质资料，可以提供含水性的判断。     

Long- and middle-term behaviour of the tilt and strain variations in the decade following the 1976 friuli earthquake in NE Italy

Tilt and strainmeter data collected in the Friuli seismic area between 1977 and 1985 have been analyzed to study the stress-strain field and/or the elastic parameter variations in the area after the strong 1976 seismic event.We concentrated on three different frequency bands, respectively linked with the tidal waves, the seasonal effect and the secular one. The results from the first two bands point at an increase of the local rigidity modulus.Relevant stresses induced by the seasonal groundwater level variations have been found, thus supporting the hypothesis that they can act as triggering effects. The secular trend reveals significant tectonic stress modifications. It appears that the post-seismic tectonic stresses faded during 1981–1983, and were followed by a new loading phase.On leave from the Institute of Geodesy and Geophysics of the Chinese Academy of Sciences. Ph. D. student at the Institute of Geodesy and Geophysics, Trieste University.     

Crustal structure of northeastern Tibet inferred from receiver function analysis

Sponsored by National Science & Technology Committee, the cooperation between China Academy of Geoscience and Institute of Geophysics and Tectonics, University Joseph, France conducted a lithospherical experiment using 40 Minititan 3-component and 13 CEIS 1-component seismometers along the road from Gonghe to Yushu in Qinghai Province during 5 months after June, 1998. The interested area is on the north of Bangong- Nujiang fault, the east of Qaidam basin, the south of Center Qilian fault and the west of Longmenshan fault. And the profile across most tectonic parts of Eastern Tibet such as Southern Qilian, Eastern Kunlun fault, Bayan Har terrane, Jinshajiang suture (Figure 1), which is the first seismological profile across Eastern Tibet (Qinghai-Tibet) and will be beneficial on the comparison with the results of its center parts, especially on the understanding of the effect of the thousands-kilometer-faraway collision between Eurasia Plate and Indian Plate on the uplifting of south and north part of Eastern Kunlun fault, and on the thickening of crust and the feature of deep structure of Qilian mountain on the north of Tibet Plateau.     

Analysis of the tidal gravity observations in Three Gorges reservoir area

The comparative observations of the tidal gravity in Three Gorges reservoir area, recorded with the LCR-ET20 gravimeter from Institute of Geodesy and Geophysics, Chinese Academy of Sciences and the DZW-9 gravimeter from Institute of Seismology, China Earthquake Administration, are introduced. High-accuracy tidal gravity pa-rameters in this area are obtained, and the scale factor of the DZW-9 gravimeter is also estimated at a value of ?(756.06±0.05)×10?8 m?s?2V?1. The observed residuals of the corresponding instruments are investigated. Nu-merical results indicate that the long-term drift of the DZW-9 gravimeter appears a linear characteristic, and the observed accuracy is of the same order comparing with that of the LCR-ET20 gravimeter. The results given in the paper can provide with an effective reference model of the tidal gravity correction to the ground based and space geodesy.     

Maximum likelihood estimation of Gutenberg-Richterb parameter for uncertain magnitude values

The maximum likelihood estimation of theb parameter in the Gutenberg-Richter relation is extended to the case of uncertain magnitude. An interval which contains the real unknown magnitude is used rather than the uncertain magnitude itself. The proposed approach is very flexible, it allows for the combination of the parts of a catalog of different quality into a single minimally biased set of recurrence parameters.On leave from the Institute of Geophysics, Polish Academy of Sciences, 00-973 Warsaw, Pasteura 3, Poland     

The fault plane of the 1991, Datong-Yanggao, Shanxi, China, M S = 5.8 earthquake

Contribution 94A0008 of Institute of Geophysics, SSB, China.     

Comparisons, processing and interpretation of the surveyed data by GMS-06 and other magnetotelluric sounding systems

In recent years, the data collecting and processing of magnetotelluric sounding （MT） have progressed greatly. How to improve the quality of field surveyed data and obtain the high quality parameters such as apparent resistivity and phase is the most important link during the overall flow. It is closely related to the signal-to-noise ratio of magnetic sensors, the resolution of data collecting units and relevant processing methods as well. Produced by Germany Metronix Measurement Instruments and Electronics Ltd., the new type multi-channel geophysical measurement system GMS-06 was already adopted and used by domeslic units such as Institute of Geology and Geophysics of Chinese Academy of Sciences and Tongji University. Based on the brief introduction of GMS-06, this paper will give the comparisons and analyses of the synchronous surveyed MT data by GMS-06, MMS-03 MT system which was also produced by Metronix and V5-2000 MT system produced by Canada Phoenix Geophysics Ltd.. Then the preliminary processing and interpretation results of the long period MT data observed by GMS-06 in the area of Shanghai and Zhejiang are also discussed in the paper.     

回首邢台地震现场的日日夜夜

记述了1966年3月8日河北邢台地震前中国科学院地球物理研究所地震预报研究工作的进展情况,以及地震发生后地震科技人员在地震现场工作的实践活动,总结了现场工作中提出的一些行之有效的方法,指出了邢台地震现场工作的历史意义。