基于接收函数的华南及邻区地壳结构研究     

查小惠  吕坚  江春亮  汤兰荣  董非非  鲍志诚  童琼 《大地测量与地球动力学》2021,41(1):67-73

利用华南地块及邻区2007～2012年609个地震台站记录的约900个5.7级以上远震事件,获得各台站的接收函数,通过分析接收函数的形态变化了解各台站下方的地壳结构特征,然后再利用H-κ叠加搜索技术获得各台站下方的地壳厚度和波速比.结果显示,研究区的地壳结构表现为从沿海向内陆逐渐复杂的变化,地壳厚度也表现出由沿海向内陆...  相似文献   

Azimuthal anisotropy in the upper mantle from observations ofP-to-S converted phases: application to southeast Australia     

Nicole Girardin  & Véronique Farra 《Geophysical Journal International》1998,133(3):615-629

  相似文献   

Facies and stacking patterns of shelf-deltas within the Palaeogene Battfjellet Formation, Nordenskiöld Land, Svalbard: implications for subsurface reservoir prediction     

WILLIAM HELLAND-HANSEN  Associate Editor: Mariano Marzo 《Sedimentology》2010,57(1):190-208

Textural and mineralogical properties of the sediment, facies characteristics (both derived from well data), stacking patterns (derived from well and seismic data) and plan‐view shapes (derived from seismic data) are all essential components when reconstructing reservoir geometries from subsurface data sets. Without the availability of all these sources of information, reservoir predictions can potentially deviate significantly from the true geometries. In particular, inferences about internal sandbody geometry from plan‐view considerations (isopach maps and seismic attribute maps) may lead to erroneous conclusions without knowledge of facies and textural properties of the sediment. Analysis of well‐exposed sedimentary systems has the potential to establish links between internal facies characteristics and large‐scale geometry and to improve models coupling information at these variable scales. The Palaeogene Battfjellet Formation, Svalbard, has been studied with the aim to unravel internal characteristics and external form by investigating sediment properties, facies and stacking patterns. The formation shows a combination of texturally and mineralogically very immature sediments, a predominance of wave‐generated or wave‐induced sedimentary structures and a stacking pattern of highly variable numbers of parasequences at localities few kilometres apart that best can be explained in terms of small shifting deltaic lobes that produced a complex pattern of overlapping sandbodies. The strong evidence of wave action in the receiving basin could in itself indicate strike‐extensive sandstone bodies; however, the complex sandbody arrangement and the immaturity of the sediments preclude such an interpretation. Traditional facies models coupling plan‐view geometries with internal facies characteristics (such as the coupling of strike extensive barrier systems with wave‐dominated sedimentary structures or the coupling of elongated fluvial‐dominated deltas with offshore‐directed current‐generated structures) are much too simple and may lead to erroneous interpretations if the complexity revealed by all sources of data is not appreciated.  相似文献   

在建设和谐社会过程中提高党的执政能力     

汪树民 《广东海洋大学学报》2006,26(5):20-23

促进社会和谐既是我国发展的重要目标和必要条件,又是我党执政能力的具体体现。当前我国社会诸多不和谐因素的存在,对于执政的中国共产党来说既是挑战也是机遇。和谐社会的创建,客观上要求提高中国共产党的执政能力,而提高党的执政能力又是实现我国社会和谐的重要条件和根本政治保障。执政能力的高低要靠执政实践来检验。所以,能否建成和谐社会,直接关系到中国共产党执政的成败。和谐社会的建设不是一蹴而就的,这将是一个长期的过程,中国共产党执政能力和执政水平的提高也将是一个渐进的过程。  相似文献   

Receiver function imaging in strongly laterally heterogeneous crust:Synthetic modeling of BOLIVAR data     

A.Levander 《地震学报(英文版)》2011,(1):45-54

We resolve a large (～20 km) discrepancy in Moho depth determined from PdS receiver functions (RFs) and from active source seismic profiling in the complex Caribbean-South American plate boundary zone in eastern Venezuela.As part of the BOLIVAR experiment 20 broadband stations were deployed along an active source profile to record teleseisms.Using the extremely heterogeneous crustal model obtained from active source data,we generated 2D finite-difference elastic wave synthetics and from them calculated recei...  相似文献   

PCA空间滤波在高频GPS定位中的应用研究   总被引：2，自引：0，他引：2  

殷海涛  甘卫军  熊永良  肖根如 《武汉大学学报(信息科学版)》2011,(7):825-829

利用主成分分析法(PCA)对高频GPS时间序列进行空间滤波,并结合Karhunen-Loeve展开法(KLE)对其结果进行判定,可有效地提取共模误差,提高单历元定位精度。通过对四川GPS连续观测网的计算分析表明,PCA方法可较好地减弱区域共模误差,并能准确地反映共模误差的空间分布,且精度优于传统的堆栈法,这对高频GPS技术的应用和发展具有重要意义。  相似文献   

利用时间序列干涉图叠加法监测江苏盐城地区地面沉降     

何敏  何秀凤 《武汉大学学报(信息科学版)》2011,36(12):1461-1465

针对永久散射体技术和短基线集法所需SAR数据较多的问题,采用时间序列干涉图叠加法监测区域地表沉降,提出利用结构函数作为判断因子提取出受大气扰动较小的干涉图用于叠加分析,以确保大气延迟误差对地表沉降监测结果影响的最小化。利用13景ASAR数据,研究了江苏省盐城市在2003-12～2009-05期间的地面沉降趋势。  相似文献   

Nappe stacking and first evidence of Late Variscan extension in the Belledonne Massif (External Crystalline Massifs,French Alps)     

Stéphane Guillot  René-Pierre Ménot  Jean-Michel Caron 《Geodinamica Acta》2013,26(2):97-111

Abstract

In the southwestern part of the Belledonne Massif (External Crystalline Massifs, French Alps), superimposition of three distinct crustal units has been interpreted as the consequence of Late Devonian-Early Carboniferous thrusting toward the ENE under typical collisional metamorphic conditions (9–7 kbar, 600–650 °C). Structural relationships between the different units and the kinematic analysis of microstructures suggest that ductile extensional tectonics with a sinistral component towards the southwest is responsible for the late structure of this domain. Extensional tectonics are responsible for the exhumation of the deep level of the nappe pile (Allemont unit) that recorded an earlier HP-LT tectonometamorphic evolution (10 ± 1 kbar, 550 ± 50 °C) and for the syn-kinematic adiabatic decompression path recorded in the two lowest units (Livet and Allemont). Such isothermal decompression may have been related to rapid thinning (~ 3mm y^?1) and led to local decompressional melting at the base of the nappe pile. The thinning is best explained by extensional tectonics processes affecting the previously thickened Variscan crust during the Upper Carboniferous prior to its restoration to normal thickness. © Elsevier, Paris  相似文献   

����α��������ĵ�������ϳɶ��������
�����о�     

刘伟平  郝金明  李瑛 《大地测量与地球动力学》2014,34(2):128-131

???????÷??????????????????????????????????GPS?????????????????????????Ч?????????????????????????????????????????紦α????????????????Ч??????????????  相似文献   

基于时序SAR影像的城市地面沉降速率获取研究     

张诗玉  谭继强  史红岭 《测绘与空间地理信息》2014,(12)

利用天津地区的2003年10月至2006年2月14幅ENVISAT/ASAR影像进行二轨差分干涉测量实验,选取相干性好、高程模糊度较大的9幅干涉图以叠加方法进行了时间序列分析,获取了地表年沉降速率,得出的地面沉降趋势与实地水准测量结果较为一致,两者较差绝对值小于6 mm,较差的标准偏差为±3.0 mm.  相似文献