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High-resolution moho depth and V_(p)/V_(s) ratio distributions in northeast China from joint inversion of receiver functions and gravity data and their geological implications

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Science China Earth Sciences 2023年第7期66卷 1569-1582页

作者： Aowei HAO Haijiang ZHANG Shoucheng HAN Wenliang XU School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China Anhui Mengcheng National Geophysical Observatory Mengcheng 233527China Xi’an Mineral Resources Survey Center of China Geology Survey Xi’an 710100China College of Earth Sciences Jilin UniversityChangchun 130061China

In this study,high-resolution moho depth and average crustal V_(p)/V_(s) ratio distributions in northeast China were obtained through joint inversion of receiver functions and gravity *** new joint inversion method comprehensively considers the complementary imaging strengths of the receiver functions in the vertical direction and the gravity data in the lateral *** a certain extent,it can reduce the adverse effects of the receiver function data caused by the sedimentary layers of the basin,the inclination of the moho,and the structure heterogeneity below the *** preprocessing the receiver function data,a regularized virtual station network was constructed using the teleseismic receiver function waveform reconstruction method to improve the overall spatial *** filter the gravity data,the velocity structure-guided gravity filtering method and gravity upward continuation were used for the shallower region above the moho and the deeper region below the lithosphere,*** newly obtained model shows that the moho depths of the Hailar Basin,Erlian Basin,Sanjiang Basin,and Bohai Bay Basin are slightly shallower than those of the surrounding areas,while the moho depths of the Greater Xing’an Range,Lesser Xing’an Range,and Zhangguangcai Range are slightly *** with previous results,the refined moho depth distribution obtained in this study has a better correspondence with topographic relief and basin boundaries,and the contrast is more evident across the north-south gravity gradient lineament(NSGL).In the eastern part of the Songliao Basin,the moho is relatively shallow,and there is a high V_(p)/V_(s) ratio,which may have been caused by the intrusion of hot mantle materials into the crust induced by lateral extension of the Songliao *** high V_(p)/V_(s) ratio of the crust below the Changbaishan volcanic area implies the existence of partial melting in the crust caused by upwelling hot mantle materials.

关键词： Receiver functions Gravity moho depth Vp/Vs ratio Northeast China

Three-dimensional constrained gravity inversion of moho depth and crustal structural characteristics at Mozambique continental margin

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Acta Oceanologica Sinica 2024年第2期43卷 120-129页

作者： Shihao Yang Zhaocai Wu Yinxia Fang Mingju Xu Jialing Zhang Fanlin Yang College of Geodesy and Geomatics Shandong University of Science and TechnologyQingdao 266590China Key Laboratory of Submarine Geoscience Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China School of Geomatics and Municipal Engineering Zhejiang University of Water Resources and Electric PowerHangzhou 310018China Ocean College Zhejiang UniversityZhoushan 316021China

Mozambique's continental margin in East Africa was formed during the break-off stage of the east and west Gondwana lands. Studying the geological structure and division of continent-ocean boundary(COB) in Mozambique's continental margin is considered of great significance to rebuild Gondwana land and understand its movement mode. Along these lines, in this work, the initial moho was fit using the known moho depth from reflection seismic profiles, and a 3D multi-point constrained gravity inversion was carried out. Thus, highaccuracy moho depth and crustal thickness in the study area were acquired. According to the crustal structure distribution based on the inversion results, the continental crust at the narrowest position of the Mozambique Channel was detected. According to the analysis of the crustal thickness, the Mozambique ridge is generally oceanic crust and the COB of the whole Mozambique continental margin is divided.

关键词： 3D constrained gravity inversion continent-ocean boundary Mozambique continental margin moho depth

Lateral variation in moho depth around the southern Tanlu fault zone and its adjacent area

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Earthquake Science 2021年第1期34卷 77-87页

作者： Dequan Hong Xianliang Huang Yun Yang Ziwen Bao Xiaoli Wang Xueying Wang Anhui Earthquake Agency Hefei 230031China Mengcheng National Geophysical Observatory Mengcheng 233500China Jiangsu Earthquake Agency Nanjing 210014China

We estimated moho depth beneath the southern Tanlu fault zone and its adjacent area using common-conversion-point(CCP)stacking of receiver functions,which were computed from teleseismic records of the *** estimated moho depth matches well with 2-D profiles derived from active-source deep seismic reflection surveys,suggesting that the calculated the moho depth map is likely accurate beyond the 2-D ***,the estimated moho depth map showed a high spatial correlation with tectonic provinces,i.e.,moho topographic boundaries are in good agreement with geological *** the Dabie orogenic belt and the mountainous areas in southern Anhui Province,the moho lies relatively deep,and there is an obvious difference in moho depth between the two sides of this segment of the Tanlu *** further selected four depth profiles with dense instrumentation to show moho depth changes across different tectonic blocks in the study *** saw two step-like changes in moho depth beneath the Xiangfan-Guangji and Gushi-Feizhong,which run parallel along the WNW-ESE direction and delineate the southern and northern bounds of the northern Dabie orogenic belt,which is likely the suture zone between the North China Block and South China *** beneath the northeast corner of the study area is significantly thinner than other areas,which is consistent with the crustal detachment model proposed for suturing between the North and South China blocks in the region east to the Tanlu fault.

关键词： CCP stacking moho depth Tanlu fault zone FuncLab

depth determination of the moho interface beneath the Tibetan plateau and other areas of China

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Earthquake Science 2012年第5期25卷 415-431页

作者： Youshun Sun Diming Yu M Nafi Toksz F Dale Morgan Xiyu Wang Jinrong Su Jun Liu State Key Laboratory of Geodesy and Earth's Dynamics Institute of Geodesy and GeophysicsChinese Academy of Sciences Department of Earth Atmospheric and Planetary SciencesMassachusetts Institute of Technology Earthquake Administration of Sichuan Province School of Civil Engineering and Architecture Wuhan University of Technology

We apply the adaptive moving window method of Sun et al. to the most recent catalog data and the data recorded by portable stations to construct the velocity structure of the crust and upper mantle, and to determine the depth of the moho interface beneath the Tibetan plateau and other areas of China. We first select 2 600 locations in the study region with 1° intervals, then at each location invert for a five-layer 1-D P-wave velocity model from the surface down to the uppermost mantle by performing a Monte Carlo random search. The moho depth at each location is then determined, and the moho interface beneath the study region is obtained through proper interpolation with certain smoothing. Compared to depths obtained by previous studies, our results show more accurate moho depths in the Tibetan plateau, Tianshan region and other areas of the study region.

关键词： moho depth moho interface Tibetan plateau

Determining the effective elastic thickness through cross-correlation between isostatic disturbances

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Geodesy and Geodynamics 2024年第3期15卷 241-251页

作者： Nelson Ribeiro-Filho Cristiano Mendel Martins Raissa Moraes Baldez Ivaldevingles Rodrigues de Souza Júnior Franck Eitel Kemgang Ghomsi Instituto Federal do Pará(IFPA) AltamiraParáBrazil Universidade Federal do Pará(UFPA) BelemParáBrazil Nansen-Tutu Center for Marine Environmental Research Department of OceanographyUniversity of Cape TownSouth Africa Geodesy Research Laboratory National Institute of CartographyYaoundeCameroon

The elastic thickness parameter was estimated using the mobile correlation technique between the observed isostatic disturbance and the gravity disturbance calculated through direct gravimetric modeling. We computed the vertical flexure value of the crust for a specific elastic thickness using a given topographic dataset. The gravity disturbance due to the topography was determined after the calculation. A grid of values for the elastic thickness parameter was generated. Then, a moving correlation was performed between the observed gravity data(representing actual surface data) and the calculated data from the forward modeling. The optimum elastic thickness of the particular point corresponded to the highest correlation coefficient. The methodology was tested on synthetic data and showed that the synthetic depth closely matched the original depth, including the elastic thickness value. To validate the results, the described procedure was applied to a real dataset from the Barreirinhas Basin, situated in the northeastern region of Brazil. The results show that the obtained crustal depth is highly correlated with the depth from known models. Additionally, we noted that the elastic thickness behaves as expected, decreasing from the continent towards the ocean. Based on the results, this method has the potential to be employed as a direct estimate of crustal depth and elastic thickness for any region.

关键词： Isostasy Elastic thickness Isostatic disturbance moho depth Cross-correlation

Structural features in the mid-southern section of the Kyushu–Palau Ridge based on satellite altimetry gravity anomaly

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Acta Oceanologica Sinica 2024年第4期43卷 50-60页

作者： Feifei Zhang Dingding Wang Xiaolin Ji Fanghui Hou Yuan Yang Wanyin Wang School of Geological Engineering and Geomatics Chang’an UniversityXi’an 710054China Qingdao Institute of Marine Geology China Geological SurveyQingdao 266071China Information and Navigation College Air Force Engineering UniversityXi’an 710077China National Engineering Research Center of Offshore Oil and Gas Exploration Beijing 100028China Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China

The Kyushu–Palau Ridge(KPR),an anti-S-shaped submarine highland at the center of the Philippine Sea Plate(PSP),is considered the residual arc of the Izu–Bonin–Mariana Island Arc,which retains key information about the cessation of the Western Philippine Basin(WPB)expansion and the Parece Vela Basin(PVB)***,using the new generation of satellite altimetry gravity data,high-precision seafloor topography data,and newly acquired ship-borne gravity data,the topographic and gravity characteristics of the KPR mid-southern section and adjacent region are *** distribution characteristics of the faults were delineated using the normalized vertical derivative–total horizontal derivative method(NVDR-THDR)and the minimum curvature potential field separation *** moho depth and crustal thickness were inverted using the rapid inversion method for a double-interface model with depth *** on these results,the crust structure features in the KPR mid-southern section,and the“triangular”structure geological significance where the KPR and Central Basin Rift(CBR)of the WPB intersect are *** KPR crustal thickness is approximately 6–16 km,with a distinct discontinuity that is slightly thicker than the normal oceanic *** KPR mid-southern section crust structure was divided into four segments(S1–S4)from north to south,formed by the CBR eastward extension joint action and clockwise rotation of the PVB expansion axis and the Mindanao fault zone blocking effect.

关键词： structural features satellite altimetry gravity data Kyushu-Palau Ridge Central Basin Rift faults moho depth

Heat Flow Distribution and Thermal Mechanism Analysis of the Gonghe Basin based on Gravity and Magnetic Methods

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Acta Geologica Sinica(English Edition) 2021年第6期95卷 1892-1901页

作者： WANG Zhuo ZENG Zhaofa LIU Zhuo ZHAO Xueyu LI Jing BAI Lige ZHANG Ling College of Geo-Exploration Science and Technology Jilin UniversityChangchun 130026China School of Biological Earth and Environmental SciencesUniversity of New South WalesKensingtonNSW 2052Australia

Geothermal resource is indispensable as a clean, renewable, stable and cheap resource. Nowadays in China, the Gonghe Basin, located in northeastern Qinghai Province, has been thought to be a promising geothermal area. To explore geothermal energy potential in and around the Gonghe Basin, geophysical means including magnetic and gravity methods were used to plot distribution. Firstly, we inversed moho depth and Curie point depth in and around the basin using gravity and magnetic data, respectively, through an improved Parker–Oldenburg algorithm. Secondly, seven different thermal models were established, considering radiogenic heat, basement depth, anomalous heat source and simulated corresponding temperature field and heat flow. These were analyzed numerically and we found the high heat flow in the Gonghe Basin coacted with radiogenic heat, an anomalous heat source and conductive heat. The distribution of seismic activities indicates that the Langshan–Wuwei–Gonghe Fault might have provided channels for transporting heat effectively.

关键词： geothermal energy heat flow thermal mechanism Curie point depth moho depth Gonghe Qinghai–Tibet Plateau

Characteristics of gravity and magnetic fields and deep structural responses in the southern part of the Kyushu-Palau Ridge

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China Geology 2021年第4期4卷 553-570页

作者： Zhen Lin Wen-chao Lü Zi-ying Xu Peng-bo Qin Hui-qiang Yao Xiao Xiao Xin-he Zhang Chu-peng Yang Xiang-yu Zhang Jia-le Chen Ministry of Natural Resources Key Laboratory of Marine Mineral Resources Guangzhou Marine Geological SurveyGuangzhou 510075China China Geological Survey Beijing 100037China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China

The southern part of the Kyushu-Palau Ridge(KPR)is located at the conjunction of the West Philippine Basin,the Parece Vela Basin,the Palau Basin,and the Caroline *** area has extremely complex structures and is critical for the research on the tectonic evolution of marginal seas in the Western Pacific ***,only few studies have been completed on the southern part,and the geophysical fields and deep structures in this part are not well *** this,this study finely depicts the characteristics of the gravity and magnetic anomalies and extracts information on deep structures in the southern part of the KPR based on the gravity and magnetic data obtained from the 11th expedition of the deep-sea geological survey of the Western Pacific Ocean conducted by the Guangzhou Marine Geological Survey,China Geological Survey using the R/V Haiyangdizhi ***,with the data collected on the water depth,sediment thickness,and multichannel seismic transects as constraints,a 3D density model and moho depths of the study area were obtained using 3D density *** results are as follows.(1)The gravity and magnetic anomalies in the study area show distinct zoning and *** detail,the gravity and magnetic anomalies to the south of 11°N of the KPR transition from high-amplitude continuous linear positive anomalies into low-amplitude intermittent linear positive *** contrast,the gravity and magnetic anomalies to the north of 11°N of the KPR are discontinuous and show alternating positive and negative *** anomalies can be divided into four sections,of which the separation points correspond well to the locations of deep faults,thus,revealing different field-source attributes and tectonic genesis of the KPR.(2)The moho depth in the basins in the study area is 6-12 *** moho depth in the southern part of KPR show ***,the depth is 10‒12 km to the north of 11°N,12‒14 km from 9.5°N to 11°N,14-16 km from

关键词： Kyushu-Palau Ridge(KPR) Characteristics of gravity and magnetic fields Mindanao fault moho depth Crust attribute Philippine Sea Plate Marine scientific survey

Regional differences in crustal structure of the North China Craton from receiver functions

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Science China Earth Sciences 2015年第10期58卷 2200-2210页

作者： WEI ZiGen CHU RiSheng CHEN Ling State Key Laboratory of Geodesy and Earth's Dynamics Institute of Geodesy and Geophysics Chinese Academy of Sciences State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences

moho depth and crustal average Poisson＇s ratio for 823 stations are obtained by H-n： stacking of receiver functions. These, to- gether with topography and receiver function amplitude information, were used to study the crustal structure beneath the North China Craton （NCC）. The results suggest that modified and preserved crust coexist beneath the craton with generally Airy-type isostatic equilibrium. The equilibrium is relatively low in the eastern NCC and some local areas in the central and western NCC, which correlates well with regional geology and tectonic features. Major differences in the crust were observed beneath the eastern, central, and western NCC, with average moho depths of 33, 37, and 42 km and average Poisson＇s ratios of 0.268, 0.267 and 0.264, respectively. Abnormal moho depths and Poisson＇s ratios are mainly present in the rift zones, the northern and southern edges of the central NCC, and tectonic boundaries. The crust beneath Ordos retains the characteristics of typical craton. Poisson＇s ratio increases roughly linearly as moho depth decreases in all three parts of the NCC with different slopes. Receiver function amplitudes are relatively large in the northern edge of the eastern and central NCC, and small in and near the rifts. The Yanshan Mountains and southern part of the Shanxi rift show small-scale variations in the receiver-function ampli- tudes. These observations suggest that overall modification and thinning in the crust occurred in the eastern NCC, and local crustal modification occurred in the central and westem NCC. Different crustal structures in the eastern, central, and western NCC suggest different modification processes and mechanisms. The overall destruction of the crustal structure in the eastern NCC is probably due to the westward subduction of the Pacific Plate during the Meso-Cenozoic time; the local modifications of the crust in the central and western NCC may be due to repeated reactivations at zones with a heterogeneous s

关键词： North China Craton moho depth Poisson's ratio gravitational equilibrium receiver function amplitude regional difference in crust

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