Haibo Huang

Chinese Academy of Medical Sciences & Peking Union Medical College

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Xuelin Qiu

Chinese Academy of Sciences

Yuhan Li

Chinese Academy of Sciences

Shaohong Xia

South China Sea Institute Of Oceanology

Enyuan He

Institute of Oceanology

Tianyao Hao

Beijing University of Technology

Ba Manh Le

Vietnam Academy of Science and Technology

Mei Xue

Tongji University

Jinlong Sun

Bureau of Geology and Mineral Exploration and Development of Guizhou Province

Minghui Zhao

Nanjing Medical University

Qingfeng Hua

First Institute of Oceanography

Cooperative Institutions

Chinese Academy of Sciences

Institute of Oceanology

University of Chinese Academy of Sciences

South China Sea Institute Of Oceanology

Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)

Ministry of Natural Resources

China Earthquake Administration

Tongji University

Qingdao National Laboratory for Marine Science and Technology

Nanjing University

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Identification and application of shear waves along the profile OBS2006-3 in the mid-northern South China Sea

Redai haiyang xuebao (2010)

Haibo Huang

Applying the joint exploration of P-wave and S-wave,the complex subsurface crustal structure can be obtained.The association of P-wave velocity and S-wave velocity is very sensitive to the physical state of rocks,and is thus very useful in lithological studies.Compared with travel-time of P-wave and S-wave,apparent velocity and particle's moving trajectory in vertical-component and radical-component seismic sections,converted S-wave phases were identified in OBS8 and OBS10 along the profile OBS2006-3 in the mid-northern South China Sea.In this paper,taking these two OBSs as examples,we discussed identification and analysis of converted S-waves in detail.A few of S-wave seismic phases(e.g.,PwSs3,PgSs3,PmS) were identified based on the optimum P-wave model using the software Rayinvr and the ratio of Vp/Vs and Poisson's ratio are calculated beneath these two OBSs stations.Based on P-wave velocity(VP=7.20-7.25km·s-1),S-wave velocity(VS= 4.20-4.23km·s-1) and Poisson's ratio(0.24),we suggest that the high velocity layer in the lower crust has a mafic composition that may originate from magmatic underplating.

P wave

S-wave

Poisson's ratio

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Citations (2)

Ocean Bottom Seismometer data of line OBS2017-2 in the South China Sea

Zenodo (CERN European Organization for Nuclear Research) (2020)

Yuhan Li Haibo Huang Xuelin Qiu Enyuan He

Dataset line OBS2017-2 was collected in June, 2017, using R/V “Shiyan 2” that belongs to the South China Sea Institute of Oceanology, CAS. The spacing of OBSs was ~9.6 km. The seismic source consisted of an array of four BOLT air-guns with a total volume of 6,000 cubic inches and was towed at ~10 m depth below sea level. 1,767 shots had been fired along OBS2017-2 from south to north, and the shooting intervals were set at 80-110 s at nominal ship speed of ~4.5 knots, resulting in a shooting interval of ~200 m on average. The format of seismic data is SAC. Please send the purpose of the data requesting, as well as the name and affiliation of the applicant to go223@scsio.ac.cn. The updated SEGY format data can be accessed through http://www.doi.org/10.11922/sciencedb.01267.

Seismometer

Ocean bottom

Line (geometry)

10.5281/zenodo.3604263

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Citations (0)

Preliminary Results of Earthquake Observations and Onshore‐Offshore Seismic Experiments on Islands of the Xisha Block, South China Sea

Chinese Journal of Geophysics (2011)

Haibo Huang Xuelin Qiu Huilong Xu Tianyao Hao Yi Xu

Abstract Temporary earthquake stations were installed on islands of the Xisha block, South China Sea and onshore‐offshore deep seismic experiments were carried out to study the crustal structure beneath this region. The seismic data were analyzed and processed. A 1‐D shear wave velocity model beneath the Chenhang island (CHH) was constructed by applying the receiver function method to the teleseismic data. A 2‐D P‐wave velocity crustal structure was modeled by ray‐tracing and travel‐time simulation. The result shows that a 2 km‐thick low‐velocity sediment which is attributed to Cenozoic deposition exists on the top of CHH. In the lower crust, there exists a prominent low‐velocity layer (LVL) with average shear wave velocity of 3.5 km/s; Moho interface lies at the depth of 24~26 km right beneath CHH. The crustal thickness gradually decreases outward along the onshore‐offshore seismic line. The crustal structure has the typical characteristics of rift valley on the northwestern side of CHH, which belongs to the extension of the Xisha trough. The presentation of the anisotropy of upper mantle minerals and the ductile rheological structure arising from hot mantle activities may result in the generation of the LVL in lower crust.

10.1002/cjg2.1683

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Citations (14)

Seismic Imaging of an Intracrustal Deformation in the Northwestern Margin of the South China Sea: The Role of a Ductile Layer in the Crust

Tectonics (2021)

Haibo Huang Frauke Klingelhoëfer Xuelin Qiu Yuhan Li Ping Wang

Abstract The continental margins of the South China Sea (SCS) have undergone episodic rifting since the Cenozoic, and there are ongoing debates surrounding the processes of crustal deformation and seafloor opening. In this work, we present a P ‐wave velocity model extending from the north of Xisha Trough to the Zhongshanan Basin in the northwestern SCS margin, using ocean bottom seismometer data of the wide‐angle seismic profile OBS2013‐1. The results show that the crust thins symmetrically across the western Xisha Trough, from more than ∼20 km at the flanks to ∼10 km in the central valley where the sedimentary layers thicken to over 6 km. In the Zhongsha Trough, closer to the deep basin, the upper crust is detached in a ∼20 km wide region and the lower crust has seismic velocities increased by more than ∼0.3 km/s. The top boundary of the lower crust is located at a depth of ∼13 km across the Zhongsha Trough, and a ∼5 km thick midcrustal ductile layer is imaged. A ∼50 km wide ocean‐continent transition region beneath the Zhongshanan Basin characterizes a ∼6 km thick continental crust underlain by serpentinized and magnetized upper mantle. These observations, together with plate reconstructions based on gravity and magnetic analysis, suggest that deformation of the continental margin was controlled by a ductile crustal layer. Magmatism, associated with the early stage oceanic accretion, has mixed with the highly extended continental crust. Developments of the failed rifted basins were controlled by the westward propagation of the continental breakup.

Seafloor Spreading

Continental Margin

Trough (economics)

10.1029/2020tc006260

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Citations (23)

Seismic Anisotropy Study of the 410-km Discontinuity Using Harmonic Decomposition of Receiver Functions

AGU Fall Meeting Abstracts (2019)

Zaijin Zhang Haibo Huang K. G. Dueker

Discontinuity (linguistics)

Receiver function

Harmonic

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Crustal structure and magmatic evolution in the Pearl River Delta of the Cathaysia Block: New constraints from receiver function modeling

Tectonophysics (2020)

Haibo Huang Xiong Hou Xuelin Qiu Yuhan Li

Underplating

Receiver function

Felsic

10.1016/j.tecto.2020.228365

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Citations (19)

Insights about the structure and development of Zhongsha Bank in the South China Sea from integrated geophysical modelling

International Geology Review (2019)

Haibo Huang Enyuan He Xuelin Qiu Xingwei Guo Jianke Fan

We construct a complete density transection based on the velocity structures across the Zhongsha Bank in the South China Sea. Gravity modelling of the lateral density contrasts between tectonic units helps us to determine the structural attributes and boundaries between continental blocks and deep basins. The configuration of the continent–ocean boundary (COB) around the Zhongsha Bank is mapped based on the gravity/magnetic anomaly and crustal structures. A low-density mantle is found beneath the Zhongsha Bank and the oceanic basins, and this mantle is associated with the high heat-flow background. The COB orientation is northeast-east in the north of the bank, with faulted linear structures. In further southeast, where there is a more intact crust, the COB orientation changed to north-northeast. The reconstructed density model and gravity/magnetic map indicate that the Zhongsha Bank is conjugated with the Liyue Bank by a rifted basin, where the crust had experienced localized deformation before the seafloor spreading. Because of the insufficient magmatism in the oceanic basin, the spreading ridge propagates into the weakened continental lithosphere between the two continental blocks, thus completely separating the Zhongsha Bank from the Liyue Bank. Seafloor spreading ridge jumps within the South China Sea may also be affected by the heterogeneous lithosphere beneath the continental blocks and oceanic basins.

China sea

10.1080/00206814.2019.1653798

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Citations (12)

Sharp Moho variation beneath SE Tibet: insight into crustal deformation from P wave receiver functions

AGU Fall Meeting Abstracts (2019)

Mingju Xu Zhouchuan Huang Haibo Huang

Moho

Receiver function

Variation (astronomy)

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