叠加速度成图在CPS3绘图系统中的实现   总被引：1，自引：0，他引：1  

王磊  林建东 《煤田地质与勘探》2000,28(5):59-60

基于CPS3绘图系统的工作原理和常规时深转换,针对目的层埋藏深,速度横向变化大,钻孔资料少的三维勘探区,摸索出了一套由叠加速度出发进行时深转换的方法。此方法成功地应用于华北煤田TSK勘探区的三维资料解释中,弥补了传统时深转换方法的不足,收到了很好的效果,所绘制的构造图深度同巷道资料吻合。   相似文献   

沉积盆地地区地壳结构估计——预测反褶积方法消除接收函数多次波混响   总被引：3，自引：0，他引：3       下载免费PDF全文

朱洪翔  田有  刘财  冯晅 《地球物理学报》2018,61(9):3664-3675

接收函数方法被广泛地应用于地壳上地幔结构的研究中,H-κ叠加方法是其中最常用的方法之一.对于布设在基岩区台站计算的接收函数,H-κ叠加方法可以准确地估计台站下方地壳厚度和平均波速比,但是对于沉积盆地地区计算的接收函数,由于低速沉积层内会产生多次波混响,干扰甚至覆盖接收函数中莫霍面的转换波和多次波震相,从而影响H-κ叠加结果的准确性.为准确估计沉积盆地地区地壳结构,本文提出使用预测反褶积方法去除接收函数中低速沉积层内多次波混响,其中预测步长由接收函数归一化自相关函数获得,物理意义为沉积层内S波双程走时.合成接收函数和实测接收函数试验表明,本文提出的预测反褶积方法可以有效地去除沉积层多次波混响,并结合改进的H-κ叠加方法可以准确地估计沉积层下覆地壳厚度和平均波速比.相比于其他去除接收函数多次波混响的方法,本文提出的预测反褶积方法具有参数设定简单、运算量小、震相幅值较大等特点,适用于大批量数据处理.  相似文献   

青藏高原东北缘甘东南地区地壳各向异性特征及构造意义          下载免费PDF全文

邵若潼  沈旭章  张元生 《地球物理学报》2019,62(9):3340-3353

本文利用径向和切向接收函数确定地壳各向异性的方法,处理了布设在青藏高原东北缘甘东南地区、横跨西秦岭北缘等断裂的24个密集宽频带流动台站远震资料,得到了研究区地壳各向异性特征.结果显示,平均快波方向呈现NW-SE、NWW-SEE及NNW-SSE,平均分裂时间0.56 s.甘东南中部及北部地区快波方向与GPS速度方向、前人利用XKS波分裂获取的快波方向及该地区断层展布方向基本一致,说明该地区壳幔运动可能是耦合的.同时研究区南部少数台站快波方向呈现NNW-SSE,与断裂方向及GPS速度方向有一定夹角,表明台站下方壳幔运动可能是解耦的.全区快波方向自北向南由近E-W逐渐转变为NW-SE,最后变为NNW-SSE.据此推测地壳在该区的变形挤压有顺时针方向旋转的趋势,这与该区块体挤压应力方向一致.  相似文献   

陆态网络共模误差的提取研究     

胡良晨  周义炎  王伟 《测绘科学》2019,44(5):37-42,60

针对"中国大陆构造环境监测网络"中的共模误差问题,该文提出了一种新的提取共模误差的方法,该方法在区域叠加滤波中引入坐标时间序列相关系数作为权重因子。基于陆态网络中时间跨度大于4年的154个基准站坐标时间序列,利用相关系数加权叠加滤波方法提取其中的共模误差并分析其特征。结果显示,滤波后测站残差坐标时间序列之间的相关性明显减小,N、E、U 3个分量的相关系数分别平均减少30.33%、19.86%、23.24%。所有测站残差坐标时间序列滤波后的RM_S在N、E、U3个分量分别平均减少9.5%、9.1%、26.1%,与区域叠加滤波结果相比分别提高了2.1%、1.2%、4.5%。结果表明,相关系数加权叠加滤波方法比区域叠加滤波方法提取共模误差更有效。  相似文献   

强流脉冲电子束辐照诱发金属纯镍中的空位簇缺陷     

邹慧  荆洪阳  王志平  关庆丰 《海洋学报》2010,32(9):6384-6389

利用强流脉冲电子束(high-current pulsed electron beam,HCPEB)技术对多晶纯Ni进行了辐照处理,采用透射电子显微镜详细分析了辐照诱发的缺陷结构.HCPEB辐照后,纯镍表层积聚了幅值极大的残余应力,沿{111}晶面形成了稠密的位错墙及孪晶结构,另外还形成了大量的包括位错圈、堆垛层错四面体(SFT)及孔洞在内的空位簇缺陷.SFT缺陷的数量远高于其他空位簇缺陷,其周围区域位错密度很低.孔洞缺陷主要出现在SFT密集区域.HCPEB瞬间的加热和冷却诱发的幅值极大的应力和极高的应变  相似文献   

大空间GPS网共模误差剔除研究     

王健  周晓慧  朱兆涵  梁林林 《大地测量与地球动力学》2018,38(1):78-82

利用叠加滤波、PCA、KLE 3种方法对欧洲区域平均基线长度为2 000 km的大空间GPS网12个IGS站9 a（2006-01~2014-12）的观测数据进行处理,分析对比3种方法剔除共模误差的效果。结果显示,3种方法剔除百分比分别为25.87%、41.48%、35.72%,滤波后坐标精度明显提高;对于较大的GPS观测网,相对于叠加滤波,PCA和KLE法效果更好,可以显示不同站点的空间特征。  相似文献   

塔里木盆地西部地区中奥陶统一间房组沉积演化及其控制因素     

郭川  陈代钊  付勇  宋亚芳  汪远征 《地质学报》2022,96(11):3924-3942

塔里木盆地中奥陶统一间房组沉积演化和沉积层序的发育特征及其控制因素目前还存在争议。选择塔里木盆地西部良里塔格山地区一间房组为研究对象,基于沉积相和高频米级沉积旋回类型的识别及其垂向叠置样式的分析,明确一间房组的沉积演化和沉积层序的发育特征及其控制因素。研究表明：(1)一间房组沉积时期,良里塔格山地区整体为一个碳酸盐岩缓坡沉积体系,主要发育10种岩相类型和2个沉积相带(潮缘—局限潮下带和开阔潮下带);(2)一间房组发育两种高频米级沉积旋回,分别为潮缘—局限潮下沉积旋回和开阔潮下沉积旋回;(3)识别出2个半三级层序,层序界面主要为岩性转换面,其中一个完整的三级层序包括海侵体系域和海退体系域两部分;(4)沉积演化与层序发育的主要控制因素包括古地理格局、沉积微地貌及不同级次的相对海平面变化。其中古地理格局控制着整体的沉积相带分布,沉积微地貌决定着特定岩相(如瓶筐石礁)发育的优势部位,不同级次相对海平面变化则制约着沉积相的时空演化。  相似文献   

Crustal thickness in southeast Tibet based on the SWChinaCVM-1.0 model          下载免费PDF全文

Liyi Chen  Weilai Wang  Long Zhang 《地震科学（英文版）》2021,34(3):246-260

Extensive geophysical research has been carried out in southeast Tibet due to the complex geological structure and high seismicity. The study of the Moho interface can provide useful information for the geophysical research. SWChinaCVM-1.0 is the first version of a regional community velocity model for the Sichuan-Yunnan region and aims to provide a reference for seismological research in the region. Based on this model, a high-precision community Moho interface model can be obtained using common conversion point (CCP) stacking, to further expand the applicability of SWChinaCVM-1.0. Before CCP stacking, it is necessary to check the fit of the practical and theoretical travel times of the Ps phase and its multiples under the constraints of the model. Using this method, referred to as Hκ0 stacking, we determined the Moho interface. However, the multiples were poorly fitted with the theoretical travel times at many stations, and the crustal thickness obtained was inconsistent with previous findings. Therefore, we speculate that the SWChinaCVM-1.0 model has some limitations that render it incompatible with the CCP stacking method. To further verify this hypothesis, we performed H-κ stacking using the vP-vS model, vP model, vS model, and the regional average velocity vP0 and compared the results with those of Hκ0 stacking. The results of the comparison indicate that the SWChinaCVM-1.0 model requires improvements. In addition, by analyzing the SWChinaCVM-1.0 inversion process, we found that the vS model was more reliable than the vP model. Finally, we adopted the crustal thickness obtained using H-κ stacking based on the vS model as the initial version of a community Moho interface model for the Sichuan-Yunnan region (SWChinaCVM-MOHO-1.0).  相似文献   

Land 3D-Seismic Data: Preprocessing Quality Control Utilizing Survey Design Specifications, Noise Properties, Normal Moveout, First Breaks, and Offset     

Abdelmoneam Raef 《中国地质大学学报(英文版)》2009,20(3)

The recent proliferation of the 3D reflection seismic method into the near-surface area of geophysical applications, especially in response to the emergence of the need to comprehensively characterize and monitor near-surface carbon dioxide sequestration in shallow saline aquifers around the world, Justifies the emphasis on cost-effective and robust quality control and assurance (QC/QA) workflow of 3D seismic data preprocessing that is suitable for near-surface applications. The main purpose of our seismic data preprocessing QC is to enable the use of appropriate header information, data that are free of noise-dominated traces, and/or flawed vertical stacking in subsequent processing steps. In this article, I provide an account of utilizing survey design specifications, noise properties, first breaks, and normal moveout for rapid and thorough graphical QC/QA diagnostics, which are easy to apply and efficient in the diagnosis of inconsistencies. A correlated vibroseis time-lapse 3D-seismic data set from n CO2-flood monitoring survey is used for demonstrating QC dlagnostles. An Important by-product of the QC workflow is establishing the number of layers for n refraction statics model in a data-driven graphical manner that capitalizes on the spatial coverage of the 3D seismic data.  相似文献   

Kinematics of crustal stacking and dispersion in the south-eastern Bohemian Massif     

H. Fritz  Franz Neubauer 《International Journal of Earth Sciences》1993,82(3):556-565

The south-eastern Bohemian Massif consolidated during the Late Variscan orogeny by the oblique collision of two continental crustal blocks after closure of an oceanic realm. One microcontinent comprises portions which are now distributed among Moravian and Moldanubian units and which are characterized by Late Proterozoic tectonothermal events, especially by granitoid intrusions. The other microcontinent includes the Gföhl gneiss and granulites (Gföhl nappe) of probable Early Palaeozoic protolith ages. Both continental blocks are separated by an ophiolite-like assemblage, which is preserved in portions of the Raabs unit.Oblique crustal stacking is accompanied by north-eastward propagation of nappes in a dextral transpressive regime. Exhumation of previously thickened crust is achieved by equally oriented bulk extension but partitioned in distinct displacement paths. Coeval stacking and extension at different crustal levels is suggested.Correspondence to: H. Fritz  相似文献