Study of Hainan Mantle Plume Based on Shear Wave Splitting Method 基于横波分裂方法的海南地幔柱研究

Ge，Tianyu1; Chen，Yongshun1,2; Zhang，Chen2

2022-03-20

10.13209/j.0479-8023.2022.014

北京大学学报(自然科学版)   影响因子和分区

0479-8023

The authors use the shear wave splitting method to calculate the XKS seismic phases recorded by the temporary broadband seismic stations of Peking University, Southern University of Science and Technology and Guilin University of Technology in Guangdong and Guangxi Provinces, and the fixed stations of China Earthquake Administration in Guangdong, Guangxi and Hainan Provinces. The authors obtain the anisotropy parameters of the upper mantle in Hainan and its adjacent areas, and the delay time is between 0.35 and 1.90 s. Based on the previous shear wave splitting results around the research region, the authors believe that with the retreat of the subduction zone of eastern Pacific plate, the asthenosphere material in the west flows eastward to fill, making the olivine lattice of the upper mantle aligned along the E-W direction in most areas of central and northern Guangdong and Guangxi. Because the continental lithosphere at the coastline is thinning rapidly, the splitting results in Guangdong coastal areas are mostly NE-SW direction, parallel to the coastline. In particular, there are several NULL stations in the coastal areas near Hainan Island, and the splitting results in the northeast corner of Hainan Island are very disorderly, with small δt. These observations support that Hainan plume may exist on the southeast of Leizhou Peninsula, which is centered at 20.5°N and 111.5°E.

Anisotropy Hainan plume Mantle flow Shear wave splitting

EI

中文

通讯

20221511959540

Coastal zones ; Earthquakes ; Lithology ; Shear flow ; Shear waves ; Silicate minerals ; Structural geology

Marine Science and Oceanography:471 ; Geology:481.1 ; Minerals:482.2 ; Seismology:484 ; Fluid Flow, General:631.1 ; Mechanics:931.1 ; Physical Properties of Gases, Liquids and Solids:931.2

2-s2.0-85127749814

Scopus

1.Institute of Theoretical and Applied Geophysics,School of Earth and Space Sciences,Peking University,Beijing,100871,China
2.Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Ge，Tianyu,Chen，Yongshun,Zhang，Chen. Study of Hainan Mantle Plume Based on Shear Wave Splitting Method 基于横波分裂方法的海南地幔柱研究[J]. 北京大学学报(自然科学版),2022,58(2):261-270.

Ge，Tianyu,Chen，Yongshun,&Zhang，Chen.(2022).Study of Hainan Mantle Plume Based on Shear Wave Splitting Method 基于横波分裂方法的海南地幔柱研究.北京大学学报(自然科学版),58(2),261-270.

Ge，Tianyu,et al."Study of Hainan Mantle Plume Based on Shear Wave Splitting Method 基于横波分裂方法的海南地幔柱研究".北京大学学报(自然科学版) 58.2(2022):261-270.