Adaptive traveltime tomography of densely sampled seismic data   总被引：1，自引：0，他引：1  

Immo Trinks  Satish C. Singh  Chris H. Chapman  Penny J. Barton  Miguel Bosch  Adam Cherrett 《Geophysical Journal International》2005,160(3):925-938

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Integrated seismic interpretation of the Carlsberg Fault zone, Copenhagen, Denmark   总被引：1，自引：0，他引：1  

Lars Nielsen  Hans Thybo  Mette I. Jørgensen 《Geophysical Journal International》2005,162(2):461-478

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Geological constraints on the evolution of the Angolan margin based on reflection and refraction seismic data (ZaïAngo project)     

Maryline Moulin  Daniel Aslanian  Jean-Louis Olivet  Isabelle Contrucci  Luis Matias  Louis Géli  Frauke Klingelhoefer  Hervé Nouzé  Jean-Pierre Réhault  Patrick Unternehr 《Geophysical Journal International》2005,162(3):793-810

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Crustal-scale seismic profiles across Taiwan and the western Philippine Sea   总被引：13，自引：2，他引：13  

Kirk McIntosh  Yosio Nakamura  T.-K. Wang  R.-C. Shih  Allen Chen  C.-S. Liu 《Tectonophysics》2005,401(1-2):23-54

We have used combined onshore and offshore wide-angle seismic data sets to model the velocity structure of the Taiwan arc–continent collision along three cross-island transects. Although Taiwan is well known as a collisional orogen, relatively few data have been collected that reveal the deeper structure resulting from this lithospheric-scale process. Our southern transect crosses the Hengchun Peninsula of southernmost Taiwan and demonstrates characteristics of incipient collision. Here, 11-km-thick, transitional crust of the Eurasian plate (EUP) subducts beneath a large, rapidly growing accretionary prism. This prism also overrides the N. Luzon forearc to the east as it grows. Just west of the arc axis there is an abrupt discontinuity in the forearc velocity structure. Because this break is accompanied by intense seismicity, we interpret that the forearc block is being detached from the N. Luzon arc and Philippine Sea plate (PSP) at this point. Our middle transect illustrates the structure of the developing collision. Steep and overturned velocity contours indicate probable large-scale thrust boundaries across the orogen. The leading edge of the coherent PSP appears to extend to beneath the east coast of Taiwan. Deformation of the PSP is largely limited to the remnant N. Luzon arc with no evidence of crustal thickening to the east in the Huatung basin. Our northern transect illustrates slab–continent collision—the continuing collision of the PSP and EUP as the PSP subducts. The collisional contact is below 20 km depths along this transect NE of Hualien. This transect shows elements of the transition from arc–continent collision to Ryukyu arc subduction. Both of our models across the Central Range suggest that the Paleozoic to Mesozoic basement rocks there may have been emplaced as thick, coherent thrust sheets. This suggests a process of partial continental subduction followed by intra-crustal detachment and buoyancy-aided exhumation. Although our models provide previously unknown structural information about the Taiwan orogen, our data do not define the deepest orogenic structure nor the structure of western Taiwan. Additional seismic (active and passive), geologic, and geodynamic modeling work must be done to fully define the structure, the active deformation zones, and the key geodynamic process of the Taiwan arc–continent collision.  相似文献   

Underestimation of scale lengths in stochastic fields and their seismic response: a quantification exercise     

Stefan Carpentier  Kabir Roy-Chowdhury 《Geophysical Journal International》2007,169(2):547-562

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青藏高原东北缘盆山结合部位深反射资料处理方法与初步地质认识   总被引：3，自引：0，他引：3  

王海燕高 锐马永生朱 铉李秋生李鹏武匡朝阳  卢占武 《中国地质》2007,34(1):142-148

盆山结合带地质条件复杂、地形起伏大,深地震反射资料具有信噪比低、各种干扰波严重以及速度横向变化大等特点。针对盆山结合部位深反射资料的特点,主要利用ProMAX处理系统对横跨若尔盖盆地和西秦岭造山带结合部位的二维深地震反射资料(简称SP04-2剖面)进行折射静校正、叠前去噪、地表一致性处理、人机交互速度分析、剩余静校正循环迭代处理、地表基准动校正叠加和叠后去噪处理等方法试验研究,形成一套适应盆山结合部位深地震反射资料的处理方法和流程,最终得到SP04-2叠加剖面。该剖面首次揭示出若尔盖盆地—西秦岭造山带盆山结合部位的岩石圈结构,为研究盆山深部接触关系提供了可靠的地震学依据。  相似文献   

变形监测中基于信号反射预计的GPS多路径误差减弱方法   总被引：1，自引：0，他引：1  

车伟  熊永良 《四川测绘》2007,30(1):7-10

多路径是高精度GPS变形监测的主要误差来源。本文在推导信号反射预计公式的基础上,提出了一种削弱GPS多路径误差影响的附加参数法。试验表明该方法能有效减弱GPS相位多路径误差的影响。  相似文献   

城市活断层探测中的反射地震数据采集和处理技术     

柴铭涛  高景华 《物探与化探》2007,31(4):365-369

随着国民经济的快速发展，对市区活断层的勘查正在各大中城市中逐步开展。作为一种主要手段，地震勘查能够查明基岩埋深，根据基岩断层向第四系地层内部的延伸可研究断层的活动性。在城市中进行地震勘查，无论是随机干扰，还是规则干扰，都十分强烈，通过对各种干扰进行分析，从中找出相应的对策；通过采用适合的数据采集方法和更有效的数据处理方法，能够有效地压制干扰，提高地震记录的信噪比。  相似文献   

声波探测技术在山东近海活断层探测中的应用   总被引：1，自引：0，他引：1  

杜宪宋  邓起东  王志才  晁洪太 《国际地震动态》2007,(11):1-10

利用声波探测技术在山东近海开展活断层探测表明,声波探测对海底最新沉积单元分层、地层变形和断裂活动均具有很高的分辨率,是适用于该海域活断层探测的理想探测技术。  相似文献   

Deep water bottom current deposition in the northern South China Sea   总被引：8，自引：0，他引：8  

SHAO Lei  LI XueJie  GENG JianHua  PANG Xiong  LEI YongChang  QIAO PeiJun  WANG LiaoLiang & WANG HongBin State Key Laboratory of Marine Geology  Tongji University  Shanghai  China  Guangzhou Marine Geological Survey  Ministry of Land  Resources  Guangzhou  China  CNOOC Ltd. Shenzhen  Shenzhen  China 《中国科学D辑(英文版)》2007,50(7):1060-1066

There are some active bottom currents on the northern continental slope of the South China Sea (SCS). Reflection seismic profiles show that the bottom current channels occur in the water depth range of 1000 to 2700 m,extending from the NE to the SW,leading to accumulation of discontinuous drifts with higher sedimentation rates on the eastern side of the channel. The stacking pattern of the layers sug-gests that these drifts propagated southwestward,following the direction of the bottom currents. One sedimentary drift to the southeast of the Dongsha Islands has the highest sedimentation rate of 97cm/ka in the last 12 ka. The sedimentary characteristics of the sediment layers indicate that these bottom currents are most likley caused by the water movement of a branch of the West Pacific Ocean Current,which enters the northern SCS via the Bashi Strait. Once formed,the bottom currents trans-port sediments along the northern slope of SCS southwestward and finally disappear into the central basin of the SCS. Due to the bottom current activity,the deep-sea sedimentary process in the northern SCS is complex.  相似文献