Regional characteristics and anomaly analysis of gravity field for the Bransfield Strait, Antarctic

Ma Long; Zheng Yanpeng; Liu Chenguang; Zhao Qiang; Pei Yanliang; Hua Qingfeng; Li Xianfeng; Xia Chenglong

doi:10.3969/j.issn.0253-4193.2017.12.005

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Ma Long, Zheng Yanpeng, Liu Chenguang, Zhao Qiang, Pei Yanliang, Hua Qingfeng, Li Xianfeng, Xia Chenglong. Regional characteristics and anomaly analysis of gravity field for the Bransfield Strait, Antarctic[J]. Haiyang Xuebao, 2017, 39(12): 42-52. doi: 10.3969/j.issn.0253-4193.2017.12.005

Citation:

Ma Long, Zheng Yanpeng, Liu Chenguang, Zhao Qiang, Pei Yanliang, Hua Qingfeng, Li Xianfeng, Xia Chenglong. Regional characteristics and anomaly analysis of gravity field for the Bransfield Strait, Antarctic[J]. Haiyang Xuebao, 2017, 39(12): 42-52. doi: 10.3969/j.issn.0253-4193.2017.12.005

Citation:

Ma Long, Zheng Yanpeng, Liu Chenguang, Zhao Qiang, Pei Yanliang, Hua Qingfeng, Li Xianfeng, Xia Chenglong. Regional characteristics and anomaly analysis of gravity field for the Bransfield Strait, Antarctic[J]. Haiyang Xuebao, 2017, 39(12): 42-52. doi: 10.3969/j.issn.0253-4193.2017.12.005

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Regional characteristics and anomaly analysis of gravity field for the Bransfield Strait, Antarctic

doi: 10.3969/j.issn.0253-4193.2017.12.005

1.
Key Laboratory of Marine Sedimentology and Environmental Geology, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China
2.
College of Marine Geosciences, Ocean University of China, Qingdao 266100, China

Received Date: 2016-12-16
Rev Recd Date: 2017-06-14

Abstract

Abstract

Bransfield Strait and its surrounding areas are the most active neotectonics region of volcanoes and earthquakes, which constitute the only existing "trench-arc-basin" system together with the South Shetland Trench and South Shetland Islands. Based on the observed data from the 28th, 30th Antarctic expeditions and the international public data, this study takes use of the isostatic correction method to invert the Moho depth and its distribution characteristics. The gravity field anormaly of the deep tectonic was analyzed. The free-air gravity anomaly shows a strip-like distribution, orienting closely to the terrain. The Bouguer gravity anomaly in the strait rises up from both of the two sides to the middle. Two high-value-anomaly traps appear in the central trough and the seamounts in the eastern trough respectively, with the highest value up to 150×10^-5 m/s². The minimum value of Moho depth (12 km) appears in the back-arc spreading area. The depth gradually increases from the back-arc spreading area to the both sides (e.g., Bransfield Strait and Antarctic Peninsula), and reaches 24 km at the slope area.
- regional gravity field,
- isostatic correction,
- anomaly analysis,
- Antarctic,
- Bransfield Strait

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References(39)

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