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石嘴山市活断层数据库是石嘴山市活断层一期探测与断层活动性初步鉴定项目中形成的重要成果之一,该数据库按照活动构造数据库模版建成。数据库包含6个专题数据库和一个专业数据库,记录了活断层探测与活动性鉴定过程中所获得的全部资料和成果,包括活断层地球物理勘探、地层样品年龄测试、钻孔联合地质剖面探测、槽探、断层活动性鉴定、地震地质调查以及地质填图等方面的内容;对石嘴山市活断层数据库建库规范、数据库内容及数据库的建库技术路线、数据符号化制图等方面作了简要介绍,可供城市活断层数据库建设和管理参考借鉴。 相似文献
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1936年广西灵山M6? 地震是华南沿海地震带内陆地区有地震记载以来发生的最大地震,由于当时仪器记录缺乏、时代相隔较长且未进行详细的现场调查,对该地震的基本参数尚存争议。本文在概述该地震地表破裂带基本特征的基础上,利用地震地表破裂带长度和最大同震位移等数据重新讨论了该地震的基本参数和发震构造。研究结果表明1936年灵山M6? 地震的宏观震中位于灵山断裂北段与友僚—蕉根坪断裂交会处一带,震级为M6.8左右,震中烈度达Ⅸ度强,罗阳山西北麓的灵山断裂为该地震的发震构造。 相似文献
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全球震中光盘数据库３．０版,向科研单位及所有用户提供地震震中资料。包括地震震中的地理位置,震级大小及震源深度,和发震时间都存贮在光盘地震数据库。通过人机对话方式进行地震数据的存取。 相似文献
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20世纪90年代我国对地壳上地幔结构的人工地震探测研究 总被引：2，自引：0，他引：2
介绍了20世纪90年代我国人工地震探测在研究大震区和潜在震源区深部细结构，发震构造的深部特征、介质物性，地壳和上地幔结构与地球动力学过程，火山深部结构，油气生成的深部构造环境等方面取得的成果，以及人工地震资料解释中P波和S波的联合应用，浅层地震反射法在地壳浅层细结构、深浅构造关系研究方面取得的进展。 相似文献
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汶川MS8.0地震科学考察数据库存储了大量的野外调查数据,主要包括野外地质观测点、地表破裂带、震区第四纪断层的展布及其活动性地质观测点、古地震探槽、断错地貌测量等数据,以及搜集来的地层数据、汶川地震及其余震、重新定位余震、历史强震等数据。文中利用ArcGis将这些野外数据进行了录入、编辑、分析和制图输出,初步构建了一个包含基础地震地质信息的汶川地震科学考察数据库,实现了数据的空间位置和属性特征的综合管理,可根据需要对相关专题的数据进行查询、分析和处理,并绘制了汶川地震构造图及地表破裂分布图,为灾后重建避让带的确定提供了依据,为进一步构建汶川地震地理信息系统奠定了数据基础 相似文献
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1 四川大地震概况 2008年5月12日西藏高原和四川盆地交界处发生大地震,从中国中部到西部的广阔地区遭到严重灾害.据中国政府发表的信息,到7月1日为止,已有69 195人死亡,18 404人下落不明,374 177人受伤,受灾总数达4 600万人.这次中国内陆发生的四川大地震,因震源在汶川而被正式命名为汶川地震. 相似文献
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山区滑坡的稳定性一直是倍受关注的一个重要安全问题。本文讨论了滑坡位移传统监测方法的缺陷和新型的基于GPS的自动监测技术所具有的独特优势,介绍了适用于山区公路滑坡位移监测的高精度的GPS技术。实践表明,采用GPS技术进行山区滑坡的稳定性监测,具有可操作性更强、精度更高、不受气候条件约束以及高度自动化等优点,能够为预测边坡可能出现失稳破坏的部位和变形破坏时间提供更可靠的监测资料,因而GPS监测技术值得在山区滑坡的变形监测领域中推广使用。 相似文献
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通常情况下花岗岩岩性稳定、岩石完整,是隧道工程的理想围岩.我国沿海地区花岗岩覆盖普遍,但因气候炎热,秋夏两季多台风暴雨,降雨量丰富,化学风化作用剧烈,使得花岗岩差异风化严重.风化作用不仅仅发生在近地表,而且深切入地下达数百米,常穿过隧道洞身.本文以新建厦门至深圳高速铁路(简称厦深高铁)某隧道工程勘察为例,采用探测深度大、工作方便的天然场源高频大地电磁测深法(HMT),探测花岗岩差异风化情况.四条相邻测线综合探测结果表明:根据HMT法二维反演剖面图中电阻率的差异,成功解释了已开挖段的施工塌陷范围,并预测了将要开挖段的强风化弱地质结构分布范围;通过垂向相对低阻异常特征定量推断了岩体风化带向下延伸情况,为隧道安全施工提供了科学指导. 相似文献
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Nonlinearity in the response of soils in the 1995 Kobe earthquake in vertical components of records 总被引：4，自引：0，他引：4
Strong motion records provided by seismic vertical arrays allow estimation of stress–strain relations in soils at depths from the surface to the location of the deepest device. As an example, time-dependent nonlinear soil behavior was estimated in vertical components of records obtained in the epicentral area of the 1995 Kobe earthquake. Degradation of the rigidity of soils in the strong motion was observed. The constructed nonlinear models of the soil behavior were used for estimating the nonlinear parts in the ground response by the nonlinear system identification technique. Nonlinear parts in the ground response were found to be as high as 50% at 2 km from the fault and 10% at 6–15 km from the fault plane. Odd types of nonlinearity, such as cubic, the fifth, seventh, etc. order, were found to be typical for soils, whereas, nonlinearities of even types are usually weak, but increase in liquefied soils. 相似文献
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The analysis of hydrogeological problems arising in bog watering by methods enabling the depth to groundwater table to be controlled was used to develop a method for estimating the efficiency of such control when data for directly solving groundwater flow problems are lacking. The effect of nonmonotone dependence of the rate of groundwater level rise on the hydraulic conductivity of peat underlain by high-permeability sand rocks is described. This effect is shown to be significant in assessing the potentialities of the operational control of groundwater level in bog massifs with this type of geological structure. 相似文献
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The possibility of forming of higher diatomic biomasses in winter in the waters of the Sea of Okhotsk water and Aniva Bay is considered. Data of field observations, satellite information, and a mathematical model describing the transformations of compounds of biogenic elements (C, Si, N, and P) are used for this purpose. Field observations confirmed that active microalgae reproduction takes place in the ice of the Sea of Okhotsk. Determinations of their species composition were carried out. The active development of diatoms in winter was confirmed by the analysis of satellite observations during the examination of chlorophyll “a” dynamics on the sea surface. Mathematical modeling yielded quantitative data to characterize the development of diatoms in winter and within the year and interrelated variations in nutrient concentrations and the biomass of planktonic community in Aniva Bay. This is the first analysis of this type for the Sea of Okhotsk. 相似文献
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Formation of deep basins in continental crust is usually explained by stretching. Intense stretching produces typical deformations in sedimentary cover. These deformations are observed in rift valleys. Deformations produced by stretching can in principle be revealed in presentsedimentary basins. There are also simple ways to reveal such deformations in fold belts, where the remmants of numerous deep basins in the continental crust were found. The sedimentary cover structure was analyzed in the Urals, Appalachians, Scandinavian Caledonides, North-American Cordilleras and in the Alpine, Verkhoyansk and Franklinian fold belts, but no deformations that are typical for significant stretching of continental lithosphere have been found there in most of the deep basins in the continental crust. These basins were commonly formed in cool cratonic areas by very rapid subsidence of the duration of a few million years. Such subsidence cannot be explained by thermal relaxation. Thrust loading as a cause of subsidence can also be excluded in most cases. The authors suggest a gabbro to eclogite transformation with the destruction of the basaltic layer as a possible cause of rapid subsidence. This occurs under upwelling of wet asthenosphere of not too high temperature to the base of the crust. Crustal attenuation from destruction of the basaltic layer permits an intense subsequent crustal shortening. This may explain why continental crust was intensely compressed only in those regions, where rapid subsidence of large magnitude took place. 相似文献