台湾费丛峡谷对强地面运动的影响研究──利用单台资料及2．5维SH混合方法          下载免费PDF全文

温联星  姚振兴 《地球物理学报》1995,(1)

本文通过格林函数反褶积方法，由台湾峡谷附近的记录资料预测峡谷区的强地面运动的时程曲线．峡谷区的理论格林函数应用２．５维ＳＨ混合方法求解．通过格林函数反褶积方法得到的峡谷区费丛１及费丛２台的位移、速度、加速度和实际资料对比，取得了满意结果．计算结果表明，峡谷底部的峰值加速度相对峡谷边缘为最小；在靠近震中的一侧，峡谷的加速度的最大振幅相对比另一侧大．还给出了其余３个台的预测结果，研究了它们的加速度傅里叶谱和反应谱．  相似文献   

辽河东部凹陷火成岩测井岩性识别方法与应用     

王红菲  江玉龙  陆哲昆  王祝文 《世界地质》2016,35(2):510-525

采用基于K-means聚类算法的RBF神经网络法对辽河盆地东部凹陷火成岩岩性进行识别。综合利用自然伽马、补偿中子、声波时差、密度与电阻率的实际测井资料,建立火成岩岩性识别的基础RBF神经网络。选取有岩芯和岩屑记录的若干井次试验验证,该方法清楚地识别出了玄武岩、粗面岩等6种火成岩,识别准确率平均可达70%以上。  相似文献   

大兴安岭小莫尔可地区碱长花岗岩的锆石U-Pb年龄、地球化学特征及其地质意义     

赵世峰  汪长生  孙景贵  祝浚泉  古阿雷  王忠禹  赵克强  明珠 《世界地质》2016,35(2):324-347

笔者研究了小莫尔可地区碱长花岗岩的锆石LA-ICP-MS U-Pb测年结果及地球化学特征,并对其成因及构造意义进行了探讨。样品中的锆石多呈半自形晶,具有振荡生长环带和较高的Th/U比值(0.38~0.68),揭示其为岩浆成因。测年结果显示,该区碱长花岗岩形成于早石炭世((348.9±2.1)Ma)。岩石地球化学分析表明,岩体主量元素具有高硅(SiO_2=75.78%~77.01%)、富钾(K_2O=4.58%~4.76%)、贫铝(Al2O3=11.80%~12.37%)、贫钙(CaO=0.28%~0.31%)、低镁(MgO=0.05%~0.09%)的特征;微量元素具有亏损Ba、Sr、P、Ti等元素,富集Rb、Th、U、K等大离子亲石元素的特征;稀土元素呈现Eu负异常明显、轻稀土元素轻度富集的"海鸥"式分配,具有典型的A型花岗岩特征。通过Eby的构造环境判别图解,进一步判别其为A2型花岗岩,代表其形成于碰撞伸展的转换过程之中。结合区域研究资料,认为其与兴安地块与松嫩地块的碰撞拼合体系有关。  相似文献   

黄河大堤根石探测的地震SH横波方法研究     

李文勇  牛向东  介伟 《地球物理学进展》2003,18(3):420-425

黄河大堤根石探测科技攻关是水利部黄河水利委员会非常关注的课题。应用地震SH横波方法进行根石探测尝试还是第一次，并取得了较好的探测效果。本文阐述了应用地震sH横波方法进行根石探测的理论基础、地震地质条件、试验参数、数据处理关键措施以及地质效果等，为黄河大堤根石全面探测及其它类似工程地质难题的解决提供了一种有价值的科学方法。  相似文献   

MOVEMENT OF THE RIDGE LINE OF SUMMER WEST PACIFIC SUBTROPICAL HIGH AND ITS POSSIBLE MECHANISM^*          下载免费PDF全文

WEN Min  HE Jinhai  TAN Yanke 《Acta Meteorologica Sinica》2003,17(1):37-51

The analysis of the 40-year averaged daily data in this paper suggests that the vertical structure and movement of subtropical high (SH) ridge in summer evidently differ in different areas,which is close related with spatially nonuniform heating.The SH ridge over the West Pacific tilts northwards with height,while one over the Central Pacific tilts southwards.The northward movements of the Central/West Pacific SH ridges both show distinct low frequency oscillations of 10-20 days,and the movement over the East Asian monsoon area shows obvious oscillations of quasi-40-days as well.The analysis shows that the solar radiation drives the seasonal meridional movement of SH,while the spatially nonuniform heating modifies its movement speed and intensity,thus resulting in its anomalous motion.  相似文献   

Scattering of plane SH waves by a circular- arc hill with a circular tunnel   总被引：1，自引：0，他引：1  

梁建文  罗昊  Vincent W.Lee 《地震学报(英文版)》2004,17(5):549-563

IntroductionEarthquakedamageinvestigationsandtheoreticalanalysesshowthatahillamplifiesincidentwavestremendouslyduetomulti-reflectionofthewaveswithinthehill;notabledynamicstressconcentrationisobservedonwallofatunnel(Pao,Mow,1973;Lee,Trifunac,1979).Therefore,itmaybeassumedthattheexistenceofatunnelinahillmighthavegreateramplificationeffectonthegroundmotionnearby,andthedynamicstressconcentrationofthetunnelinthehillmightbemorenotable.Itiscommonthattherailwaysorhighwaysarethroughahilloramountainwi…  相似文献   

移动平台全张量重力梯度数据的噪声抑制     

陈曦  吴燕冈  袁园  常畅  余青露 《世界地质》2015,34(2):491-496

全张量重力梯度仪器测量数据中包含了大量的白噪声和有色噪声。传统的数字滤波器只能滤除某一频段外的噪声,对于混叠在重力梯度有用信号频段范围内的有色噪声不能很好的对其进行分离。为了同时滤除白噪声和有色噪声,笔者利用卡尔曼滤波器采用增广矩阵法将全张量重力梯度数据中的有色噪声进行估计,在抑制白噪声的同时将有用信号和有色噪声分离,并利用数字滤波器与卡尔曼滤波器的优点,将其结合生了更好的滤波效果,得到了更高质量的梯度信号。通过模型试验验证了本方法对噪声的滤波能力,并满足高精度重力梯度数据处理要求。  相似文献   

斜入射平面SH波在层状半空间中沉积谷地周围的三维散射     

梁建文  梅雄一  巴振宁 《中国地震》2012,28(4):370-380

采用直接刚度法计算自由场动力响应,以层状半空间中移动斜线均布荷载动力格林函数模拟散射波场,采用间接边界元方法求解了层状半空间中沉积谷地对斜入射平面SH波的三维散射问题.由于文中采用的层状场地三维动力刚度矩阵是精确的,且用于模拟散射波场的均布移动斜线荷载可以直接施加在沉积交界面处而不存在奇异性,所以本文方法具有很高精度.文中以均匀半空间和基岩上单一土层中沉积谷地对入射SH波的散射为例进行了数值计算,研究表明,沉积谷地对地震波的三维散射与二维散射之间存在本质差别;层状半空间中沉积谷地与均匀半空间中沉积谷地附近地表位移存在显著差异.  相似文献   

Anti-plane （SH） waves diffraction by cavity： analytical an underground semi-circular solution   总被引：1，自引：1，他引：0  

Luo Hao  Vincent W. Lee  Liang Jianwen 《地震工程与工程振动(英文版)》2010,9(3):385-396

Diffraction of a two-dimensional (2D) semi-circular cavity in a half-space under incident SH-waves is studied using the classic wave function expansion method with a new de-coupling technique. This so-called “improved cosine halfrange expansion” algorithm exhibits an excellent performance in reducing displacement residual errors at two rim points of concern. The governing equations are developed in a manner that minimizes the residues of the boundary conditions. Detailed derivation and analysis procedures as well as truncation of infinite linear governing equations are presented. The semi-circular cavity model presented in this paper, due to its simple profile, is expected to be used in seismic wave propagation studies as a benchmark for examining the accuracies of various analytical or numerical methods for mixed-boundary wave propagation problems.  相似文献   

Surface motion of a semi-elliptical hill for incident plane SH waves          下载免费PDF全文

Jianwen Liang  Jia Fu 《地震科学（英文版）》2011,24(5):447-462

A closed-form analytical solution of surface motion of a semi-elliptical cylindrical hill for incident plane SH waves is presented. Although some previous analytical work had already dealt with hill topography of semi-circular and shallow circular, our work aims at calculating surface motion of very prolate hill for high incident frequency, and explaining the special vibrating properties of very prolate hill. Accuracy of the solution is checked by boundary conditions, numerical results for surface motion of oblate and prolate hills are calculated, and some conclusions are obtained.  相似文献