我国地理信息系统建设及进展(3)   总被引：5，自引：0，他引：5  

黄杏元 《现代测绘》2004,27(4):3-7

介绍了GIS产业发展和基础软件研制的历程和现状，提出目前地理信息科学发展的阶段性成果、技术体系、目前学术研究和发展的趋势，以实现地理空间信息在自动化、时效性、可靠性方面满足社会的需要。  相似文献   

强振幅地震属性分析技术在车排子地区油气检测中的应用   总被引：3，自引：1，他引：3  

王离迟  洪太元  江洪 《新疆地质》2006,24(3):310-313

准噶尔盆地西缘车排子地区是目前中石化的有利探区,P2井的突破,加速了该区油气勘探的步伐.为了提高勘探的经济效益,用地震特殊处理手段对有利目标进行预测就显得非常重要和迫切.本文运用强振幅属性分析技术有效地预测了该区的有利目标区,并经实钻证实.强振幅属性分析技术是目前车排子地区油气检测的有效手段.  相似文献   

Relocations of Earthquakes (1899–1917) in South-Central Alaska     

Diane I. Doser 《Pure and Applied Geophysics》2006,163(8):1461-1476

I have relocated 18 earthquakes occurring in the south-central Alaska region between 1899 and 1917 using a bootstrap relocation technique. Locations of events within the Yakutat region suggest that the 1899 sequence began on 4 September with a M_S = 7.9 event within the area of the Pamplona fault zone/western Transition fault zone, rupturing the western portion of the North American/Pacific plate interface. A M_S = 7.4 event on 10 September appears to have ruptured the offshore portion of the plate interface to the east of the 4 September event. This was followed by a M_S = 8.0 event that likely ruptured the onshore and down-dip portion of the plate interface. A M_S = 7.0 event in 1908 may have ruptured a small portion of the plate interface between the 4 September and 10 September events. Events occurring between 1911 and 1916 in the Prince William Sound region appear to be slab events occurring in similar locations to more recent seismicity. Within the Kodiak region the 1900 earthquake of M_S = 7.7 has a location consistent with the rupture of the Kodiak asperity which also ruptured during the 1964 great Alaska earthquake. Other large magnitude Kodiak events appear to be associated with regions of recent seismicity, including the Karluk Lake area of southwestern Kodiak Island and the Albatross Basin located offshore southeast of Kodiak Island. Space-time seismicity patterns since 1899 indicate that magnitude 6 to7 events have occurred with regularity in the Kodiak Island region; that there has been a lack of magnitude ≥ 6 events in the Prince William Sound region since 1964, and that the Yakutat region has remained notably quiescent at the magnitude ≥ 6 level.  相似文献   

单索面混凝土矮塔斜拉桥的动力特性     

蔺鹏臻  刘凤奎  张元海 《世界地震工程》2006,22(3):111-115

以厦门银湖矮塔斜拉桥为例,通过引入拉索自振频率影响度的概念,分析了拉索的存在对矮塔斜拉桥自振特性的影响,探讨了矮塔斜拉桥的自振特性与相应连续梁桥(或刚构桥)的区别;在分析矮塔斜拉桥地震反应的基础上,通过引入振型贡献率的概念,分析了高阶振型对矮塔斜拉桥动力性能的影响;分析了矮塔斜拉桥的振型耦联效应。最后首次较全面地总结了单索面混凝土矮塔斜拉桥的动力特性,对进一步认识矮塔斜拉桥的动力性能有一定的参考意义。  相似文献   

测定一块岩石成岩压力的可能性          下载免费PDF全文

徐嘉谟  陈月娥 《地质科学》1998,33(4):494-501

用一种超低弹性模量(约为0.01MPa)且具有光弹性的软材料铸模的自重卸荷实验证明了固体材料对它的固化压力具有“记忆”的属性。根据成岩地质体在开挖条件下实测位移场特征和用具有“记忆”性能的相似材料所做的开挖模拟实验结果分析,岩石很可能也具有这种属性。这就为测定岩石成岩压力的可能性提供了重要的理论依据。  相似文献   

New seismic data support Cenozoic rifting in George VI Sound, Antarctic Peninsula   总被引：1，自引：0，他引：1  

A. C. Bell  & E. C. King 《Geophysical Journal International》1998,134(3):889-902

New multifold seismic-reflection and wide-angle reflection/refraction data across George VI Sound, Antarctic Peninsula, show the presence of graben and horst structures indicating an extensional origin. The data suggest that rocks of an accretionary complex and fore-arc basin underlie the Sound and are in faulted contact along its eastern boundary with volcanic and plutonic rocks of the associated Mesozoic arc of western Palmer Land. A cover of possible syn- and postglacial Cenozoic deposits drapes the structures. The combination of new seismic, synthetic-aperture radar and previously acquired data suggests subduction-related rifting in the Sound was segmented, with opening in the south predominately by normal extension whilst in the north, dextral transtension predominated.  相似文献   

声纳测深结合DGPS方法建立海底地形模型     

王鸿龙 《地球科学与环境学报》1998,20(2):28

介绍了声纳测深在海洋探测中的应用原理与方法,分析影响测深精度的因素及处理方法;并提出用差分ＧＰＳ配合声纳测深进行动态连续定位,从而建立海底地形模型的设想。  相似文献   

水平分量磁变仪的定向与定向检查     

朱兆才 《东北地震研究》1996,12(4):50-55

水平分量磁变仪定向与定向检查是保证记录质量的一项重要工作。本文研究表明，失磁下影响的的一般条件下，定向与定向检查均可用”扭头带动镜面法进行，日常可根据定向记录位置ｎ。监 状态。已有精确定向结果的标度线圈用于定向检查与校正操作简便，如果度盘进一步改进，检查精度也可以达到较高水平。  相似文献   

杨斜断裂以南元古代古侵入体的厘定及其地质意义   总被引：2，自引：0，他引：2  

李万生 《陕西地质》1996,(2)

陕西商州杨斜断裂以南，天井湾断裂（商丹断裂带分枝断裂）以北地区发育的一套片麻杂岩体是中带（户县—兰田地区）秦岭岩群中解体出的最古老的变质侵入体，而秦岭岩群变质地层仅部分残留其中。依据侵入体产状、成分特点可进一步划分为4个岩石单元。岩石化学特征表明，该变质侵入体为典型的Ⅰ型花岗岩类，形成于洋壳向陆壳俯冲的构造环境，推断其形成时代为早晋宁期。  相似文献   

BOREAS中北部针叶林的短波辐射传输测量结果及建模(英文)     

Ｊ．Ｌ．Ｒｏｕｊｅａｎ 《遥感学报》1997,(Z1)

通过ＢＯＲＥＡＳ实验，我们研究了北部森林植物群落对气候变化所起的作用。对针叶林地带太阳辐射通量的测量表明在辐射场中有重要的方向效应。这些效应主要与树林的分布及树冠结构有关。一个简单的方向传输模型可以解释在观测结果中的一个重要的角度特征。  相似文献