Imaging the Ice Sheet and Uppermost Crustal Structures with a Dense Linear Seismic Array in the Larsemann Hills, Prydz Bay, East Antarctica

Fu, Lei1,2; Guo, Jingxue3; Li, Junlun4; Deng, Bao4; Liu, Guofeng5; Xiao, Enzhao3; Chen, Xiaofei1,2

2022

10.1785/0220210135

SEISMOLOGICAL RESEARCH LETTERS   影响因子和分区

0895-0695

1938-2057

Comprehensive geophysical surveys including magnetotelluric, seismic, and aerial gravity-magnetic surveys are essential for understanding the history of Antarctic tectonics. The ice sheet and uppermost structure derived from those geophysical methods are relatively low resolution. Although ice-penetrating radar can provide high-resolution reflectivity images of the ice sheet, it cannot provide constraints on subice physical properties, which are important for geological understanding of the Antarctic continent. To obtain high-resolution images of the ice sheet and uppermost crustal structure beneath the Larsemann Hills, Prydz Bay, East Antarctica, we conduct an ambient noise seismic experiment with 100 short-period seismometers spaced at 0.2 km intervals. Continuous seismic waveforms are recorded for one month at a 2 ms sampling rate. Empirical Green's functions are extracted by cross correlating the seismic waveform of one station with that of another station, and dispersion curves are extracted using a new phase-shift method. A high-resolution shear-velocity model is derived by inverting the dispersion curves. Furthermore, body waves are enhanced using a set of processing techniques commonly used in seismic exploration. The stacked bodywave image clearly shows a geological structure similar to that revealed by the shear-wave velocity model. This study, which is the first of its kind in Antarctica, possibly reveals a near-vertical intrusive rock covered by an ice sheet with a horizontal extent of 4 km. Our results help to improve the understanding of the subice environment and geological evolution in the Larsemann Hills, Prydz Bay, East Antarctica.

SCI ; EI

英语

第一 ; 通讯

National Natural Science Foundation of China[41974044,"U1901602",41790465,41876227] ; National Key Research and Development Projects[2018YFC0603500] ; Shenzhen Key Laboratory of Deep Offshore Oil and Gas Exploration Technology[ZDSYS20190902093007855] ; Leading Talents of Guangdong Province Program[2016LJ06N652] ; Key Special Project for Introduced Talents Team of Southern MarineScience and Engineering Guangdong Laboratory (Guangzhou)[GML2019ZD0203] ; Shenzhen Science and Technology Program[KQTD20170810111725321]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:000734319200006

SEISMOLOGICAL SOC AMER

20221211803508

Antennas ; Dispersion (waves) ; Geological surveys ; Glaciers ; Ice ; Seismic prospecting ; Seismic waves ; Shear flow ; Shear waves ; Wave propagation ; Waveform analysis

Geology:481.1 ; Geophysical Prospecting:481.4 ; Seismology:484 ; Earthquake Measurements and Analysis:484.1 ; Fluid Flow, General:631.1 ; Mechanics:931.1

GEOSCIENCES

Web of Science

1.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China
2.Southern Marine Sci & Engn Guangdong Lab Guangzho, Guangzhou, Peoples R China
3.MNR, Key Lab Polar Sci, Polar Res Inst China, Shanghai, Peoples R China
4.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei, Peoples R China
5.China Univ Geosci Beijing, Sch Geophys & Informat Technol, Beijing, Peoples R China

Fu, Lei,Guo, Jingxue,Li, Junlun,et al. Imaging the Ice Sheet and Uppermost Crustal Structures with a Dense Linear Seismic Array in the Larsemann Hills, Prydz Bay, East Antarctica[J]. SEISMOLOGICAL RESEARCH LETTERS,2022,93(1):288-295.

Fu, Lei.,Guo, Jingxue.,Li, Junlun.,Deng, Bao.,Liu, Guofeng.,...&Chen, Xiaofei.(2022).Imaging the Ice Sheet and Uppermost Crustal Structures with a Dense Linear Seismic Array in the Larsemann Hills, Prydz Bay, East Antarctica.SEISMOLOGICAL RESEARCH LETTERS,93(1),288-295.

Fu, Lei,et al."Imaging the Ice Sheet and Uppermost Crustal Structures with a Dense Linear Seismic Array in the Larsemann Hills, Prydz Bay, East Antarctica".SEISMOLOGICAL RESEARCH LETTERS 93.1(2022):288-295.