Seismic characteristics near the epicenter of the 1303 Hongtong M=8 earthquake, Shanxi Province and its implication     

王健  吴宣  张晓东  汪素云 《地震学报(英文版)》2004,17(4)

Introduction A great earthquake occurred on Sept. 25 of 1303 (Seventh of Dade, Yuan Dynasty) around Zhaocheng and Hongtong in Shanxi Province. The great earthquake is a very famous one, which is affirmed as the first earthquake with magnitude 8 in Chinese history. The catastrophes took place; meanwhile, huge archives of the disaster were recorded. According to these disaster recordings, the first isoseismal map in China was delineated, which provide us with abundant information of intensi…  相似文献   

山阳县银厂沟铜银矿地质特征及成因初探     

白胜利  赵选政  李志高 《陕西地质》2004,22(2):18-24,34

银厂沟铜银矿位于“山柞旬”贵、有色金属成矿区的东北部。区内异常展布与泥盆系下统西岔河组相一致。矿体主要赋存于西岔河组下段砾(砂)屑硅质岩中。矿体的形成经历了同生热水沉积及后期构造改造两个阶段，矿床类型应为沉积一改造型。  相似文献   

吉林南部晚寒武世凤山期三叶虫化石群落与沉积环境分析     

丁旋 《吉林大学学报(地球科学版)》1997,(3)

吉林南部晚寒武世凤山期地层出露良好，三叶虫化石丰富，是进行化石群落古生态研究的理想地区。通过埋藏学分析、化石形态功能分析、围岩沉积学研究，在本区建立了六个底栖三叶虫化石群落，自下而上为Ｐｔｙｃｈａｓｐｉｓ－Ｔｓｉｎａｎｉａ群落，Ｑｕａｄｒａｔｉｃｅｐｈａｌｕｓ群落，Ｃｈａｎｇｉａ群落，Ｃａｌｖｉｎｅｌａ群落，Ｍｉｃｔｏｓａｕｋｉａ群落，Ｒｉｃｈａｒｄｓｏｎｅｌａ群落，结合化石群落及其赋存岩性特征，分析本区凤山期沉积环境由前滨－近滨相带渐变为浅海陆棚相带，海水逐渐加深。  相似文献   

WinASEAN for remote sensing data analysis     

Nguyen Dinh Duong  Shoji Takeuchi 《ISPRS Journal of Photogrammetry and Remote Sensing》1997,52(6):253-260

The image analysis system ASEAN (Advanced System for Environmental ANalysis with Remote Sensing Data) was designed and programmed by a software development group, ImaSOFr, Department of Remote Sensing Technology and GIS, Institute for Geography, National Centre for Natural Science and Technology of Vietnam under technical cooperation with the Remote Sensing Technology Centre of Japan and financial support from the National Space Development Agency of Japan. ASEAN has been in continuous development since 1989, with different versions ranging from the simplest one for MS-DOS with standard VGA 320×200×256 colours, through versions supporting SpeedStar 1.0 and SpeedStar PRO 2.0 true colour graphics cards, up to the latest version named WinASEAN, which is designed for the Windows 3.1 operating system. The most remarkable feature of WinASEAN is the use of algorithms that speed up the image analysis process, even on PC platforms. Today WinASEAN is continuously improved in cooperation with NASDA (National Space Development Agency of Japan), RESTEC (Remote Sensing Technology Center of Japan) and released as public domain software for training, research and education through the Regional Remote Sensing Seminar on Tropical Eco-system Management which is organised by NASDA and ESCAR In this paper, the authors describe the functionality of WinASEAN, some of the relevant analysis algorithms, and discuss its possibilities of computer-assisted teaching and training of remote sensing.  相似文献   

Scoping analyses of the coupled thermal-hydrological-mechanical behaviour of the rock mass around a nuclear fuel waste repository     

A.P.S. Selvadurai  T.S. Nguyen 《Engineering Geology》1997,47(4):2317-400

Scoping calculations were performed in order to assess the influence of radiogenic heat on the performance of the rock mass around a nuclear fuel waste repository. The full coupling between the thermal, mechanical and hydrological processes involved was considered by using the finite element code, FRACON, developed through an extension of Biot's classical theory of soil consolidation. By considering the full T---H---M coupling, several important safety features, which would otherwise be omitted in uncoupled analyses, were detected in the present study. In particular, it was shown that the heat-induced pore pressure increase around the repository has the potential to significantly increase the rate of groundwater flow, and affect the structural integrity of the rock mass.  相似文献   

原子吸收分光光度法测定矿石中高含量的银和锌     

信文瑞  郭炫  杨飞 《铀矿地质》1993,(6)

本文介绍了用转角和降低喷雾量,在强盐酸介质中,火焰原子吸收直接测定矿石中高含量的银和锌。本法测得的结果稳定,未发现干扰,灵敏度、精密度、准确度及工作曲线均满足于许多矿石中高含量银和锌的测定。  相似文献   

小像幅航空摄影中若干技术要求的研究   总被引：1，自引：0，他引：1  

宣家斌  李相华  孙和利 《武汉大学学报(信息科学版)》1994,(2)

本文系统研究了小像幅航摄资料用于小面积大比例尺地形图测绘的可能性以及实施中的技术要求，并用调制传递函数测定了小像幅航摄资料的分解力。  相似文献   

Emission and flux of DMS from the Australian Antarctic and Subantarctic Oceans during the 1988/89 summer     

A. R. McTaggart  H. R. Burton  B. C. Nguyen 《Journal of Atmospheric Chemistry》1995,20(1):59-69

DMS emissions and fluxes from the Australasian sector of the Antarctic and Subantarctic Oceans, bound by 46–68° S and 65.5–142.6° E, were determined from a limited number of samples (n=32) collected during three summer resupply voyages to Australian Antarctic continental research bases between November 1988 and January 1989 (a 92 day period). The maximum DMS emission from this sector of the Antarctic Ocean was in an area near the Antarctic Divergence (60–63° S) and the minimum DMS emission was from the Antarctic coastal and offshelf waters. The greatest emission of DMS from this sector of the Southern Ocean was from the Subantarctic waters. DMS flux from the Australasian Antarctic Ocean was 64.3×10⁶ (±115) mol d^–1 or 5.9 (±10.6)×10⁹ mol based on an emission of 10.9 (±19.5) µmol m^–2 d^–1 (n=26). The flux of DMS from the Australasian sector of the Subantarctic Ocean was probably twice the flux of DMS from the adjacent Antarctic Ocean.  相似文献   

减少大地对地震信号吸收问题的有效方法     

LI An-bang LIU Cai WANG Shi-yu FENG Xuan LIU Yang College of GeoExploration Science  Technology  Jilin University  Changchun  China 《吉林大学学报(地球科学版)》2006,(Z2)

为了解决大地对地震信号(尤其是高频信号)吸收衰减严重的问题,采用介质内测点的方法进行表层结构调查。通过井深和药量的大量试验,最后采用了小药量组合激发的方法;保证高频地震信号能量充分向下传播,从而达到提高地震资料分辨率的目的。实际应用表明,利用该方法收到了较好的效果。  相似文献   

西天山石炭纪火山岩岩石学及Sr-Nd同位素地球化学研究   总被引：18，自引：34，他引：18  

朱永峰  周晶郭璇 《岩石学报》2006,22(5):1341-1350

西天山石炭纪火山岩连续从玄武岩、粗面质玄武安山岩、粗面安山岩、粗面岩一直演化到流纹岩。不同地区火山岩的同位素组成差别很大。出露在拉尔敦达坂一带的晚石炭世粗面安山岩-粗面岩具有较高的εNd（t）值（＋2、68～＋4．29）和较高的初始^87Sr／^86Sr值（0、7015～0．7051）。新源城南的早石炭世粗面安山岩．流纹岩具有相对较低的εNd（t）值（-0．22～＋0．87）和变化较大的初始^87Sr／^86Sr值（0．7045～0．7068）。早石炭世玄武岩的初始^87Sr／^86Sr值较低且变化范围较小（0．7045～0．7058），εNd（t）值高且变化范围大（＋0．89～＋3．04）。本文的同位素地球化学资料以及前期的年代学研究表明，西天山晚泥盆-早石炭世岛弧自西向东逐渐消亡，取而代之的是晚石炭世碰撞后富钾岩浆的喷发。  相似文献