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Velocity structure in the South Yellow Sea basin based on first-arrival tomography of wide-angle seismic data and its geological implications

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Acta Oceanologica Sinica 2023年第2期42卷 104-119页

作者： Weina Zhao Zhiqiang Wu Fanghui Hou Xunhua Zhang Tianyao Hao Hanjoon Kim Yanpeng Zheng Shanshan Chen Huigang Wang Qingdao Research Institute Northwestern Polytechnical UniversityXi’an710072China Hubei Key Laboratory of Marine Geological Resources China University of GeosciencesWuhan430074China Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources Institute of GeologyChinese Academy of Geological SciencesBeijing100037China Qingdao Institute of Marine Geology China Geological SurveyQingdao266071China Institute of Geology and Geophysics Chinese Academy of SciencesBeijing100029China Marine Active Fault Research Group Korea Institute of Ocean Science and TechnologyBusan49111Republic of Korea Key Laboratory of Marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdao266061China School of Marine Science and Technology Northwestern Polytechnical UniversityXi’an710072China

The South Yellow Sea basin is filled with Mesozoic-Cenozoic continental sediments overlying pre-Palaeozoic and Mesozoic-Palaeozoic marine *** multi-channel seismic data cannot describe the velocity structure of the marine residual basin in detail,leading to the lack of a deeper understanding of the distribution and lithology owing to strong energy shielding on the top interface of marine *** this study,we present seismic tomography data from ocean bottom seismographs that describe the NEE-trending velocity distributions of the *** results indicate that strong velocity variations occur at shallow crustal *** velocity bodies show good correlation with surface geological features,and multi-layer features exist in the vertical velocity framework(depth:0–10 km).The analyses of the velocity model,gravity data,magnetic data,multichannel seismic profiles,and drilling data showed that high-velocity anomalies(>6.5 km/s)of small(thickness:1–2 km)and large(thickness:>5 km)scales were caused by igneous complexes in the multi-layer structure,which were active during the *** locations of good Mesozoic and Palaeozoic marine strata are limited to the Central Uplift and the western part of the Northern Depression along the wide-angle ocean bottom seismograph *** the Indosinian movement,a strong compression existed in the Northern Depression during the extensional phase that caused the formation of folds in the middle of the survey *** study is useful for reconstructing the regional tectonic evolution and delineating the distribution of the marine residual basin in the South Yellow Sea basin.

关键词： ocean bottom seismograph South Yellow Sea basin strata velocity structure wide-angle seismic data CSDP-2

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Crustal structure and contact relationship revealed from deep seismic sounding data in South China

Crustal structure and contact relationship revealed from dee...

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中国科学院地质与地球物理研究所2007学术年会

作者：张忠杰 Chinese Academy of Sciences State Key Laboratory of Lithosphere EvolutionInstitute of Geology and Geophysics

A 400km-long wide-angle seismic profile in the South China crosses three tectonic domains:southeast continental margin of Yangtze block,northwest continental margin of Cathaysia block,and South China Suture Zone separating these two *** crustal velocity model constructed from traveltime fitting shows that the crust thickness thins from the northwest to the southeast along the *** also reveals the crustal contact relationship between the Yangtze and Cathaysia blocks,where the Wuchuan-Sihui fault is the boundary between *** this profile with two more profiles in the continental South China and three profiles in the northern margin of South China Sea,constructs a continent-ocean transition *** cross-section reveals that the Moho depth shallows gradually along the cross-section from the Yangtze block to the Cathaysia block and the northern margin of South China Sea,but shallows abruptly in the continent-ocean transition to the South China Sea.

关键词： Crustal structure wide-angle seismic data Continent-ocean transition Yangtze block Cathyasia block South China

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Systematic variations in seismic velocity and reflection in the crust of Cathaysia:New constraints on intraplate orogeny in the South China continent

Systematic variations in seismic velocity and reflection in ...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Zhongjie Zhang Tao Xu Bing Zhao José Badal State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Physics of the Earth Sciences BUniversity of Zaragoza

The South China continent has a Mesozoic intraplate orogeny in its interior and an oceanward younging in postorogenic magmatic *** order to determine the constraints afforded by deep structure on the formation of these characteristics,we reevaluate the distribution of crustal velocities and wide-angle seismic reflections in a 400 km-long wide-angle seismic profile between Lianxian,near Hunan Province,and Gangkou Island,near Guangzhou City,South *** results demonstrate that to the east of the Chenzhou-Linwu Fault(CLF)(the southern segment of the Jiangshan-Shaoxing Fault),the thickness and average P-wave velocity both of the sedimentary layer and the crystalline basement display abrupt lateral variations,in contrast to layering to the west of the fault,This suggests that the deformation is well developed in the whole of the crust beneath the Cathaysia block,in agreement with seismic evidence on the eastwards migration of the orogeny and the development of a vast magmatic province,Further evidence of this phenomenon is provided in the systematic increases in seismic reflection strength from the Moho eastwards away from the boundary of the CLF,as revealed by multi-filtered(with band-pass frequency range of 1-4,1-8,1-12 and 1-16Hz) wide-angle seismic images through pre-stack migration in the depth domain,and in the P-wave velocity model obtained by travel time fitting,The CLF itself penetrates with a dip angle of about 22°to the bottom of the middle part of the crust,and then penetrates with a dip angle of less than 17°in the lower crust. The systematic variation in seismic velocity,reflection strength and discrepancy of extensional factors between the crust and the lithosphere,are interpreted to be the seismic signature of the magmatic activity in the interest area,most likely caused by the intrusion of magma into the deep crust by lithospheric extension or mantle extrusion.

关键词： wide-angle seismic data Crustal velocity Frequency filtering Migration and stacking Lithospheric extension Yangtze block Cathaysia block

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Crustal P-wave velocity structure in Lower Yangtze region:Reinterpretation of Fuliji-Fengxian deep seismic sounding profile

Crustal P-wave velocity structure in Lower Yangtze region:Re...

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中国科学院地质与地球物理研究所2006学术年会

作者： BAI Zhiming~1 & WANG Chunyong~2 1.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China 2.Institute of Geophysics,China Earthquake Administration,Beijing 100081,China

The finite-difference inversion method and Rayinvr technique had been employed to interpret the wide-angle seismic reflection/refraction data of the Fuliji-Fengxian deep seismic sounding(DSS) profile in Lower Yangtze region,hence the velocity structure was acquired and conclusions were summarized as follows:(1) The velocity model along this profile can be divided into three large layers vertically(upper,middle and lower crusts) and six blocks laterally,and this velocity distribution agrees with the feature of stable platform.(2) The depth of Moho discontinuity is 30-36 *** thickness of the upper crust is 10.5-13.0km,where the lateral velocity varies strongly,and the velocity increases to 6.2 kms at ***,the velocity distributions in the bottom layer of middle crust and lower crust have an apparent *** velocity in upper layer of middle crust,lower layer of middle crust,lower crust and uppermost mantle is 5.9-6.2,6.3-6.4,6.6-7.0 and 8.06-8.29 kms,respectively.(3) On two sides of the Tanlu fault belt(TFB),the mid-crustal velocity structure is quite different, nevertheless no apparent discrimination in velocity distribution and boundary topography exhibits in lower crust,hence it is inferred that the Jiashan segment of TFB had probably cut through whole crust in the Mesozoic,and the fault behaviour in lower crust had disappeared due to the low viscosity produced by the orogenic extension or crustal balance,while the fault features in the rigid middle-upper crust have been preserved up to the present.(4) The moderate earthquakes with Ms>5.0 nearby Zhenjiang are related to the deep faults extending into the lower crust,and the earthquakes were probably induced by the energy been transferred from mantle lithosphere to upper-mid crust along the deep faults,and aggregated at some preferable tectonic positions.

关键词： eastern China Fuliji -Fengxian DSS profile wide-angle seismic data velocity structure Tanlu fault belt earthquake

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Shear velocity and Vp/Vs ratio structure of the crust beneath the southern margin of South China continent

Shear velocity and Vp/Vs ratio structure of the crust beneat...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Bing Zhao Zhi Zhang Zhiming Bai José Badal Zhongjie Zhang State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Key Laboratory of Geological Engineering of Guangxi Province Resource and Environment EngineeringGuilin Technology College Physics of the Earth Sciences BUniversity of Zaragoza

We here present the results of the inverse modeling of crustal S-phases recorded from a 400-km-long seismic profile,with azimuth nearly N30W,from Lianxian,near Hunan Province,to Gangkou Island,near Guangzhou City,Guangdong Province,in the southern margin of South China *** finding in this case is that many shot gathers provided by this wide-angle seismic experiment show relatively strong reflected and refracted S phases,in particular some crustal refractions(Sg waves)and Moho reflections(SmS waves or simply Sm waves).The P-wave velocity structure of the crust and uppermost mantle was already obtained through the interpretation of vertical-component shot ***,with constraints introduced by the P-wave velocity architecture and after picking up S-wave traveltime data on the seismograms,we have obtained the S-velocity model of the crust by adjusting these traveltimes but keeping the geometry of the crustal *** results demonstrate:(1)the average crustal Svelocity is about 3.64 kmis to the northwest of the Wuchuan-Sihui fault,and 3.62 kmis to the southeast of this fault;(2)relatively constant S-velocity of about 3.42 kmis for the upper crust,3.55 kmis for the middle crust and laterally varying shear velocity around 3.82 kmis for the lower crust;(3)correspondingly, VpiVs ratio is 1.73 for the upper crust,1.71 for the middle crust and 1.74 for the lower *** shear velocities and Vp]Vs ratio correlate well with the major active faults that break the study area,and show significant changes especially in the upper *** Poisson’s ratio(1.8)is observed at shallow depth beneath the Minzhong depression to the southeast of the Wuchuan-Sihui fault and the Huiyuan depression in the southern margin of South China *** contrast,a very low V/V ratio(1.6g) is observed between g and 14 km depth beneath *** deeper depth,a high Vp/Vs ratio(1.76)is observed in the lower crust beneath the Minzhong depression.

关键词： wide-angle seismic data Reflection/refraction patterns S-wave velocity in the crust Vp/Vs ratio Yangtze and Cathaysia blocks South China

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