Investigation of rupture process of the 1999 M =5.4 Xiuyan, Liaoning, earthquake sequence

Conclusions The sequence of the November 29, 1999 Xiuyan, Liaoning, earthquake withM _S=5.4 is relocated, and its rupture process is analyzed. Results are as follows: The rupture extended mainly before the January 12, 2000,M _S=5.1 earthquake. There are two phases of rupture extending: The first phase was before the November 29, 1999,M _S=5.4 earthquake, epicenters were situated within a small region with a dimension of about 5 km, and the focal depth increased. It shows that the rupture mainly extended from shallow part to deep in the vertical direction. The second phase was between theM _S=5.4 earthquake and theM _S=5.1 earthquake, earthquakes migrated along southeast, the focal depth decreased. It indicates that the rupture extended along southeast and from deep to shallow part. Foundation item: The Project of “Mechanism and Prediction of the Strong Continental Earthquake” (95-13-05-04). Contribution No. 01FE2017, Institute of Geophysics, China Seismological Bureau.     

Anisotropy of the apparent resistivity variation rate near the epicentral region for strong earthquakes

IntroductionThe geo-electrical anisotropy before earthquake is of special significance for the prediction of earthquake location and for the research on crustal stress status near the epicentral region. The anisotropy has been studied from various aspects (CHEN, et al, 1983; QIAN, et al, 1985, 1996; LU, et al, 1990a; MAO, et al, 1995; RUAN, et al, 1999). But the anisotropic phenomena presented by geo-electrical data are not practically satisfactory and not clear as compared with the res…     

Soil Loss by Wind Erosion for Three Different Textured Soils Treated with Polyacrylamide and Crude Oil, Iraq

ＩＮＴＲＯＤＵＣＴＩＯＮＬａｒｇｅａｒｅａｓｏｆａｒｉｄａｎｄｓｅｍｉａｒｉｄｒｅｇｉｏｎｓｏｆｔｈｅｗｏｒｌｄａｒｅａｆ ｆｅｃｔｅｄｂｙｗｉｎｄｅｒｏｓｉｏｎ .Ａｐｐｒｏｘｉｍａｔｅｌｙ 2 8.4%ｏｆｔｈｉｓａｒｅａａｒｅａｆｆｅｃｔｅｄｂｙｓｅｖｅｒｅａｎｄｖｅｒｙｓｅｖｅｒｅｗｉｎｄｅｒｏｓｉｏｎ (Ｋａｔｅｓｅｔａｌ.,1977) .ＩｎＩｒａｑ ,ｔｈｅａｒｉｄａｎｄｓｅｍｉａｒｉｄｒｅｇｉｏｎｓｒｅｐｒｅｓｅｎｔｎｅａｒｌｙ 75%ｏｆｔｈｅｔｏｔａｌｌａｎｄ .5 0 %ｏｆｔｈｉｓｌａｎｄｉｓｓｕｂｊｅｃ…     

长白山天池火山地震类型与地震分布

根据１９８５￣１９９５年天池火山地震观测，对天池火山地震类型及地震分布进行了讨论，并对天池火山地震的波形特征作了分析，最后，对天池火山地震与监测提出了３点建议。     

珠江三角洲工业地域分工研究

本文从专业化部门的数量和发展水平以及专业化部门地区分布和组合两方面揭示珠江三角洲工业地域分工的基本特点。指出新形势下虽然不少县市存在专业化部门多而不精，工业结构趋同的问题，但珠江三角洲地域分工格局已开始形成。文章还讨论了形成工业地域分工特点的原因并提出了完善地域分工的措施。     

工业区位因素变化与工业地理学研究的新动向

工业生产在国家和地区社会经济发展中的作用表现为阶段性变化,并在工业区位因素和工业空间特征的变化上表现出来。80年代以来,这种变化突出表现为技术因素和社会文化因素对工业生产和工业区位的影响日盆增强以及工业生产组织的国际合作的扩展,这种变化导致了工业地理学研究方法和研究领域的革新拓展。     

锤击法在桩基质量检测中的应用及实测曲线分析

锤击法在桩基质量检测中是一种行之有效的手段。本文结合工程实例对桩的常见缺陷及其反射波特征作了浅析,对锤击法实测曲线判读和解释进行了归纳总结。     

经济学和地理学对区位论发展轨迹的影响

本文从学科发展史的角度,论述了区位论的发展轨迹,区位论与经济学和地理学在研究内容和方法上的异同,以及相互之间的促进关系。     

重庆地区重复地震识别及在数字地震台网定位评价中的应用

利用重庆数字地震台网2010年1月至2017年12月的地震波形资料和观测报告,选出5个研究区1 251个M_L≥1.5地震进行波形互相关计算,识别出358对同时被2个地震台站记录且各台波形互相关系数(cc)不小于0.8的重复地震对,涉及342个地震事件,约占地震总数的27%。将筛选出的重复地震对用于定量判断地震目录中震相拾取误差及评估台网定位精度,结果显示:重庆数字地震台网的垂直定位误差约为3 km,水平定位误差约为5 km,Pg、Sg震相拾取误差分别为0.5 s和0.7 s;其中武隆区地震定位和震相拾取精度最高,綦江区最低。     

基于多源监测数据的雷电预警方法

以浙江省气象台已经业务运行多年的基于雷达数据的雷电预警产品(预警时效为60min,分辨率为1km×1km,4个预警等级)为基础,融合闪电定位系统数据和大气电场数据,提出一种基于多源监测数据的雷电预警方法。使用2018年的观测数据进行预警效果检验,结果表明:雷电预警的漏报率为31.89%,空报率为30.54%,临界成功指数为60.53%,比使用单一监测数据的雷电预警效果有所提高。由此可见,该雷电预警方法对浙江省雷电天气的预警具有参考价值和指示意义。