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Depth distribution of moho and tectonic framework in eastern Asian continent and its adjacent ocean areas

Science China Earth Sciences 2003年第5期46卷 428-446页

作者：滕吉文曾融生闫雅芬张慧 InstituteofGeologyandGeophysics ChineseAcademyofSciences InstituteofGeophysics ChineseSeismologicalBureau

With the results of interpretation of seismic sounding profiles acquired in the past 30 years in the continent of China and its adjacent countries and ocean regions, such as Russia, Ka-zakhstan, Japan, India, Pakistan, Philippine ocean basin, Pacific and Indian Ocean, we compiled a 2D moho distribution map for the continent and its adjacent areas of eastern Asia. From the fea-tures of depth distribution and undulation of moho, it is suggested that the eastern Asian region can be divided into 18 gradient belts with different sizes, 18 crustal blocks, 20 sediment basins and depression zones. The depth of moho varies smoothly in each block, while the boundary (separat-ing different blocks) delineates the abrupt variation of moho depth. Then, some subjects,such as oregen and sediment basin, fault system and rift, plate boundary, ocean-continent coupling and tectonic framework, are discussed based on the distribution gradient belts and block partition fea-tures of moho depth in the eastern Asia and its adjacent regions.

关键词： moho, block partition, sediment basin, boundary field effect, eastern Asian continent.

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East-west crustal structure and “down-bowing” moho under the northern Tibet revealed by wide-angle seismic profile

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Science China Earth Sciences 2002年第6期45卷 550-558页

作者：张中杰李英康王光杰滕吉文 S.Klemperer 李敬卫范进义陈赟 Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100101 China

We recognized 6 sets of reflecting P- and S-wave events from moho and other interfaces within the crust, respectively, with the wide-angle seismic data acquired from 510 km-long Selincuo-Ya'anduo profile in the northern Tibet, fitted the observed events with forward modeling, and interpreted crustal structure of P- and S-wave velocities and Poisson's ratio under the profile. The results demonstrate that the crustal structure between Yarlungzangbo and Bangong-Nujiang sutures changes abruptly, and the crust is the thickest at the middle part of the profile with thickness of 80 km or more. The 'down-bowing' moho is the striking feature for the crustal variation along the west-east direction. The moho uplifts with steps, and the uplifting rate westward is greater than that eastward. The heterogeneity of P- and S-wave velocities exists both vertically and horizontally, and one lower velocity layer (LVL) exists with the depth range of 27-34 km and the thickness range of 5-7 km. For the upper crust, Poisson's ratio is the lowest at the middle part of the profile; for the lower crust, the Poisson's ratio at the east segment is lower than that at west segment, which means that the crustal rigidity for the upper crust is different from the lower crust, and the lower crust under the east segment of the profile is more ductile. We infer that the substance in the lower crust endured eastward flow along with the collision between Eurasian and Indian plates, and the 'down-bowing' moho is attributable to the multi-phase E-W tectonic processes.

关键词： northern Tibet, wide-angle seismic profile, P- and S-wave velocity, Poisson's ratio, 'down-bowing' moho, eastward flow of materials.

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