共查询到20条相似文献,搜索用时 15 毫秒
1.
By systematically analyzing the data of gravity reiteration in the Hexi region and taking a dynamic viewpoint.we have studied the evolution characters of gravity field during the preparation-occurrence of the Jingtai Ms5.9 earthquake of June 6,2000,The patterns of dynamic change of the gravity field clearly reflected how the gravity field evolved from the quasi-homogeneous state to non-homogeneous state for earthquake preparation and then the earthquake occurred.Besides,we have also studied the relation between the characteristic gravity change and strong earthquake activity. 相似文献
2.
GouLiang ZengQingquan LiuDongqing YangGaoyin 《应用地球物理》2003,6(1):92-96
The Qiangtang basin is one of the large-scale basins in China, which is located in the high-altitude and cold area. In 1994 the preliminary gravity, magnetic and electric prospecting work was undertaken in this area. Over three years the gravity, magnetic and electric reconnaissance work had been completed. The integrated interpretation of complex gravity, magnetic and electric data had identified the boundary of the basin. The relationship between the basin and mountains is a south-north ramp structure. The basin structure consisted of one uplift and two sags, five depressions and two arches. The complex evaluation showed that the regions of Baitanhu and Youyiquan in the Qiangtang basin were considered to be the most perspective ones in sense of oil-gas bearing. 相似文献
3.
Geological structure of the yellow sea area from regional gravity and magnetic interpretation 总被引:7,自引:0,他引:7
Regional gravity and aeromagnetic data covering the area of 32°- 38° N, 118°-127° E at the scale of 1:1,000,000 are coordinated and integrated in a synthetic study of the South China Yellow Sea and adjacent areas. Depth to magnetic crystalline basement and its structure are determined by magnetic anomaly inversion. Depth to and thickness of the Paleozoic rock are also revealed by gravity anomaly inversion with constrains of the basement and known seismic information from several profiles. Structure units, main faults, basin boundaries, and sub-suppressions are outlined on the basis of gravity data interpretation. 相似文献
4.
Introduction During and before the construction of the Three Gorges Project, the annual observation was continuously undertaken by the Three Gorges gravity observation network established around the head area of the reservoir (the section between Sandouping and Badong). This network has pro-vided substantial high precise data related to seismic activity. However, the annual gravity survey together monitoring of the existed observation stations can hardly effective monitor some potential sei… 相似文献
5.
Zhu Yiqing 《中国地震研究》2005,19(4):346-353
INTRODUCTIONThe study of earthquakeforecast based on gravity measurement has been carried out for almost30yearsin China,and remarkable progress has been made(Jia Minyu,et al.,2000;Zhu Yiqing,etal.,2001).However,constrained byobservationtechniques and moni… 相似文献
6.
Inversion of gravity and topography data for the crust thickness of China and its adjacent region 总被引:1,自引:0,他引:1
Introduction Since the middle of the century, gravitational isostasy has been a fundamental hypothesis for inverting the gravity data to find the crust thickness. Geophysicists have done a lot of researches on using gravity data to investigate the depth of Moho discontinuity. Since 1980, the International Lithosphere Program emphasized the importance of investigating the Moho depth variation. Thereafter a lot of results have been published in the world (Braitenberg et al, 2000; Kaban et al,… 相似文献
8.
9.
HaoHongjian WangCaifu LiuYunxiang WeiYan LinCunguo 《应用地球物理》2003,6(1):87-91
Experience gained in many years proved that oil explorations were very difficult to complete with seismic methods only in seismic-unfeasible areas. The expected results in these places could only be obtained with the integrated geophysical surveys, the combination of gravity, electric, magnetic,geochemistry and seismic methods. The high-precision gravity,magnetic and electric techniques used in seismic-unfeasible areas in Qaidam Basin had achieved many astonishing results,which demonstrated a feasible way for oil exploration in Qaidam Basin and offered a basis for data interpretation in complex areas where seismic data was not able to acquire. 相似文献
10.
收集了粤桂琼地区4个台站的连续重力观测资料和雷琼地区的流动重力观测资料,研究了广西北流—广东化州5.2级地震前粤桂琼地区重力变化特征。其中连续重力观测资料的分析从重力扰动和重力M2波潮汐因子变化两个方面进行;流动重力观测资料的分析从重力场差分动态和累积动态变化两个方面进行。连续重力观测资料的研究表明震前粤桂琼地区连续重力观测资料无异常现象;雷琼地区流动重力观测资料的研究结果表明,广西北流—广东化州5.2级地震前,震中附近地区存在重力场变化异常,异常持续时间约2年,异常范围约100 km,异常量级约50x10~(-8)m·s~(-2),地震发生于重力场变化的高梯度带上。 相似文献
11.
重力测井是一种常规的地球物理方法,具有较大探测深度,对以生物礁及溶孔溶洞为储层的密度异常体的探测具有重要的意义。本文论述了重力测井的研究进展,分析了重力测井的基本原理以及面临的问题和急需解决的科学问题,讨论了今后需要研究的方向及基本课题.认为重力测井在解决复杂储层勘探难题和油气藏动态监测方面具有其它常规测井所不具有的优势,重力测井技术在理论和实践两方面都是可行的,具有广阔的发展前景. 相似文献
12.
对实测的西藏高原布格重力异常和自由空间异常的分析发现,青藏高原四周为重力异常梯级带、地壳厚度陡变带和一系列深大断裂带,从而推断青藏高原可能为一断块高原;现代欧亚板块和印度板块碰撞挤压带不是雅鲁藏布江断裂带,而是在喜马拉雅山和雅鲁藏布江的中间地带。对重力复测资料分析的结果表明,西藏地区重力场变化之敏感点在雅鲁藏布江与其稍偏南一带以及该区北东向的深大断裂带上。西藏地区的地壳运动尤其是新生代以来的地壳活动也集中表现在深大断裂带及其附近。 相似文献
13.
14.
区域重力调查是一项基础地球物理调查工作。它的成果可用于研究地质构造、资源勘探、环境调查,地震灾害、地球形状、地球物理理论等方面。它象征着一个国家科学技术发展水平,特别是地学方面的水平。地矿部研究了国内外重力勘查情况,于1978年提出并组织、实施了全国范围的区域重力调查。通过十多年的工作,取得了丰硕成果。本文就地矿部区域重力调查成果与展望,予以论述。 相似文献
15.
16.
17.
采用引潮势和海潮潮族作为输入函数,对北京实测的重力潮汐进行了响应分析,将频率相同的引潮力产生的重力天文(引力)潮和海洋潮汐负荷效应产生的重力负荷潮分离开.再对重力天文潮和负荷潮进行调和分析,得到北京重力天文潮和负荷潮的平均变幅分别为121.5和7.5微伽.海洋潮汐的负荷影响为北京重力天文潮的6.2%. 相似文献
18.
本文通过分析陆地实测空间重力异常数据、海洋船载测量空间重力异常数据、卫星测高重力异常,布格重力异常数据、EGM2008地球重力模型数据等多种来源数据的性质和精度,并对相关数据进行对比,研究了编制1:500万中国海陆空间重力异常图的数据使用方案和技术方法.在地形较为平坦、实测数据分布均匀的陆区,使用实测数据,在地形复杂,实测数据稀少以及没有实测数据的陆区或岛屿,利用布格重力异常反推空间异常的方法合成平均空间重力数据,西藏地区的数据对比实验证明合成平均空间重力异常数据是一种有效的数据补充.利用三观测列方差分解法在南海地区对船载测量空间重力数据和美国SS系列及丹麦DNSC08GRA卫星重力数据进行了方差分解计算,结果表明不同来源的卫星测高重力数据具有很大的一致性,数据精度较以往有了很大的提高.海区空间重力数据使用原则是在船载重力测量数据校准下,全面使用卫星测高重力数据进行编图.海陆过渡区的异常处理应以EGM2008地球重力模型重力场为基准参考场,实现海陆异常平缓过渡,无缝连接.对中国海陆空间重力异常场进行了小波变换处理,对空间重力异常场进行了解读,勾画出三横四竖的一级重力梯级带及其所围限的8个一级重力异常区,并划分了二级重力异常区和梯级带,为块体构造学体系中大地构造格架的建立提供了地球物理证据. 相似文献
20.