河西地区重力动态变化的二维离散小波多尺度分解   总被引：7，自引：5，他引：2  

朱桂芝  祝意青  唐文  程宏宾 《大地测量与地球动力学》2004,24(1):46-49

采用二维离散小波的多尺度分解技术，对1994～1995年和2002～2003年的河西地区重力动态变化进行分解，提取该地区不同层次的重力动态变化异常，结果反映了不同深度在一定尺度意义上的介质密度的动态变化分布。  相似文献   

Late glacial fans in the eastern Skagerrak; depositional environment interpreted from swath bathymetry and seismostratigraphy     

Oddvar Longva  Heidi A. Olsen  David J.W. Piper  Leif Rise  Terje Thorsnes 《Marine Geology》2008,251(1-2):110-123

The origin of acoustically transparent fan deposits overlying glacial till and ice-proximal sediments on the southern margin of the Norwegian Channel has been studied using high-resolution seismic-reflection profiles and multibeam bathymetry. The first deposits overlying glacigenic sediments are a series of stacked, acoustically transparent submarine fans. The lack of glaciomarine sediments below and between individual fans indicates that deposition was rapid and immediately followed the break up of the Late Weichselian ice cover. The fans are overlain by stratified glaciomarine sediments and Holocene mud. Because of the uniformity of this drape, the upper surface of the fan deposits is mimicked at the present seafloor, and the bathymetric images clearly show the spatial relationship of the fans to bedrock ridges and the presence of braided channel-levee systems on the surface of the youngest fans. The acoustically transparent character of the fan deposits indicates that they comprise silt and clay, and their lobate form and lack of internal stratification indicates that they were deposited by debris flows. The channel-levee morphology indicates deposition from more watery hyperconcentrated fluid flows. The fan sediments were either derived from 1) erosion of Mid Weichselian lake deposits in southern Skagerrak or 2) from Late glacial ice-margin lake deposits, ponded against the Norwegian Channel ice stream, which collapsed catastrophically when the lateral support was removed as the ice disintegrated. Fans composed almost exclusively of fine-grained sediment need not, therefore, rule out an origin in a deglacial setting relatively close to the former margins of glaciers and ice sheets.  相似文献   

湖北随州 ML4.7地震序列基础资料分析     

李峰  李垠  薛军蓉  陈俊华 《大地测量与地球动力学》2007,27(Z1):56-61,88

依据随州三里岗ML4.7地震序列的地震监测和宏观调查所获得的基础资料,对此次地震序列的时空强特征及地震成因机理进行了分析。为使地震资料准确可靠,对混淆在序列中的爆破波形与地震波形进行了鉴别和剔除。结合这些基础资料和震源机制解结果。分析认为随州地震序列在成因上与该地区存在的北东和北西向两组断裂构造有关,但主发震构造是北西向断裂。  相似文献   

Late quaternary seismic stratigraphy and active faults of the Gulf of İzmit (NE Marmara Sea)     

Mahmut Okyar  Ali Pinar  Devrim Tezcan  Züheyr Kamaci 《Marine Geophysical Researches》2008,29(2):89-107

The Upper Quaternary seismic stratigraphy and active faults of the Gulf of İzmit were investigated by means of high-resolution shallow seismic profiling data in the source region of 1999 İzmit earthquake. High-resolution seismic reflection data correlated with borehole data indicate that the stratigraphy of İzmit Bay consists of three distinct depositional sequences formed in response to middle Pleistocene-Holocene sea-level changes. Reflector R, separating the pre-Holocene sequences (1 and 2) from the Holocene sequence (3), represents an erosional unconformity produced by the subaerial fluvial erosion of the continental shelves at the time of the last glacial maximum. Occasional, anomalous reflections (acoustic turbidity) observed within the Holocene sequence are interpreted as gas accumulations. The maximum thickness of the Holocene sediments is found to be about 25 m. The isopach map of Holocene sediment implies that the thickness of the Holocene decreases from the east towards the central and western basins of İzmit Bay. Two distinct fault systems are interpreted in İzmit Bay. The main fault system extending roughly in an E-W direction along the Gulf of İzmit is an active right lateral strike slip fault with a normal component. The secondary faults are normal faults striking in different directions and these are identified as being both active and inactive. In addition, prominent compressive features are identified in the seismic cross-sections of some profiles acquired to the east of Hersek Peninsula where the focal mechanisms of the aftershocks of the 1999 İzmit earthquake also reveal predominantly reverse faulting mechanisms, as identified by a local dense seismic network.  相似文献   

省级气象业务宽带信息网络构建策略     

任晓炜 《成都信息工程学院学报》2005,20(4):447-450

根据目前省级气象部门业务发展需求,结合当地电信行业的发展状况,提出一种可持续发展的宽带网络构建方案.  相似文献   

常德1631年大震事件的多场点群发式构造模型     

甘家思  刘锁旺  申重阳 《大地测量与地球动力学》1993,(4)

根据对常德1631年地震事件的史料鉴别,尤其是江陵为典型七度震害这一事实,运用震声传播方向和地光物理场以及地震烈度衰减关系,拟合推断此地震事件的序列主要由安乡北6 3/4级地震、常德北太阳山7级地震、澧县6级地震、大庸6级地震和澧县—安乡6 1/2级地震组成,相应的地震地质背景是江汉—洞庭地区晚更新世以来的剩余形变呈四象限分布。若考虑地震-构造相关分布为“Z”字型,则该地震事件的主控构造——太阳山断裂带东断裂具左旋走滑的力学机制。根据区域地震—构造相关发展过程,常德大震事件可视为1668年郯城8 1/2级地震的前震序列组成部分。  相似文献   

Deep seismic reflectivity patterns in specific tectonic units of Western and Central Europe   总被引：2，自引：0，他引：2  

Petra Sadowiak  Thomas Wever  Rolf Meissner 《Geophysical Journal International》1991,105(1):45-54

  相似文献   

Q along the FENNOLORA profile     

J. Havskov  J. Medhus 《Geophysical Journal International》1991,106(3):531-536

  相似文献   

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李红  陈连旺  李玉江 《大地测量与地球动力学》2008,28(2):39-44

?????????????????????????????????????GPS????????????????????????????????????????4?????????????????????????????????????????????????????????????????????????壻??????????????????????????????????????????壻?齭???????????????????????????????????塣???????????????????????ζ?????????????????????????????????????????????κ??齭???????????????????????????????????????????????  相似文献   

综合多信息进行地震约束储层随机建模——以准噶尔盆地庄1井区J1S2^2砂组为例   总被引：1，自引：0，他引：1  

程立华  吴胜和  贾爱林  杨海长  宋春刚 《海洋地质与第四纪地质》2008,28(3)

针对地震约束储层随机建模中地震反演波阻抗数据体与岩相概率关系差的问题,提出综合多信息、逐级约束、多级建模的思路方法。首先以地震反演数据体约束建立地球物理特征曲线随机参数场,再以每一个地球物理特征曲线参数场为约束建立相模型,最后以优选的相模型和地球物理特征曲线参数场为约束进行储层参数建模。该方法在井距较大的开发前期评价阶段具有较好的应用效果。  相似文献