Isostatic anomaly characteristics and tectonism of the New Britain Trench and neighboring Papua New Guinea

In this paper, we calculated Bouguer gravity anomalies and Airy-Heiskanen isostatic anomalies in the New Britain Trench and surrounding areas of Papua New Guinea. The calculations are based on a topographic model and a gravity anomaly model from the Scripps Institute of Oceanography. Characteristics...

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Main Authors: Guangliang Yang, Chongyang Shen, Jiapei Wang, Songbai Xuan, Guiju Wu, Hongbo Tan
Format: Article
Language:English
Published: KeAi Communications Co., Ltd. 2018-09-01
Series:Geodesy and Geodynamics
Online Access:http://www.sciencedirect.com/science/article/pii/S1674984717301738
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spelling doaj-e29a565e835c4fe4900c66f2ee61a6c12021-03-02T10:22:25ZengKeAi Communications Co., Ltd.Geodesy and Geodynamics1674-98472018-09-0195404410Isostatic anomaly characteristics and tectonism of the New Britain Trench and neighboring Papua New GuineaGuangliang Yang0Chongyang Shen1Jiapei Wang2Songbai Xuan3Guiju Wu4Hongbo Tan5Key Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, China; Wuhan Base of Institute of Geodynamics, China Earthquake Administration, Wuhan 430071, China; Corresponding author. Key Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, China.Key Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, China; Wuhan Base of Institute of Geodynamics, China Earthquake Administration, Wuhan 430071, ChinaKey Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, China; Wuhan Base of Institute of Geodynamics, China Earthquake Administration, Wuhan 430071, ChinaKey Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, China; Wuhan Base of Institute of Geodynamics, China Earthquake Administration, Wuhan 430071, ChinaKey Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, China; Wuhan Base of Institute of Geodynamics, China Earthquake Administration, Wuhan 430071, ChinaKey Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, China; Wuhan Base of Institute of Geodynamics, China Earthquake Administration, Wuhan 430071, ChinaIn this paper, we calculated Bouguer gravity anomalies and Airy-Heiskanen isostatic anomalies in the New Britain Trench and surrounding areas of Papua New Guinea. The calculations are based on a topographic model and a gravity anomaly model from the Scripps Institute of Oceanography. Characteristics of the isostatic anomaly and the earthquake dynamic environment of this region are analyzed, and the results show that there are obvious differences in the isostatic state between each block in the region. Tectonic movements are very intense in regions with high positive or negative isostatic gravity anomalies, and a number of sub-plates in this area are driven by external tectonic action, such as plate subduction and thrusting, of the Pacific, Indo-Australian and Eurasian plates. From the distribution of the isostatic gravity anomaly, the tectonic action of anti-isostatic movement obviously is the main source of power. Based on isostatic gravity and spatial distribution of earthquakes in the region, it is obvious that further contraction of the Indo-Australian Plate will result in the southwestern part of the Solomon Plate becoming part of the Owen Stanley thrust belt, and the northern part will enter the lower part of the Bismarck Plate. The eastern part of the Solomon Plate will enter the front of the Pacific Plate, resulting in northward and eastward migration of significant earthquakes along the Solomon Plate. Keywords: Papua New Guinea, New Britain Trench, Earthquake, Bouguer gravity anomaly, Isostatic gravity anomalyhttp://www.sciencedirect.com/science/article/pii/S1674984717301738
collection DOAJ
language English
format Article
sources DOAJ
author Guangliang Yang
Chongyang Shen
Jiapei Wang
Songbai Xuan
Guiju Wu
Hongbo Tan
spellingShingle Guangliang Yang
Chongyang Shen
Jiapei Wang
Songbai Xuan
Guiju Wu
Hongbo Tan
Isostatic anomaly characteristics and tectonism of the New Britain Trench and neighboring Papua New Guinea
Geodesy and Geodynamics
author_facet Guangliang Yang
Chongyang Shen
Jiapei Wang
Songbai Xuan
Guiju Wu
Hongbo Tan
author_sort Guangliang Yang
title Isostatic anomaly characteristics and tectonism of the New Britain Trench and neighboring Papua New Guinea
title_short Isostatic anomaly characteristics and tectonism of the New Britain Trench and neighboring Papua New Guinea
title_full Isostatic anomaly characteristics and tectonism of the New Britain Trench and neighboring Papua New Guinea
title_fullStr Isostatic anomaly characteristics and tectonism of the New Britain Trench and neighboring Papua New Guinea
title_full_unstemmed Isostatic anomaly characteristics and tectonism of the New Britain Trench and neighboring Papua New Guinea
title_sort isostatic anomaly characteristics and tectonism of the new britain trench and neighboring papua new guinea
publisher KeAi Communications Co., Ltd.
series Geodesy and Geodynamics
issn 1674-9847
publishDate 2018-09-01
description In this paper, we calculated Bouguer gravity anomalies and Airy-Heiskanen isostatic anomalies in the New Britain Trench and surrounding areas of Papua New Guinea. The calculations are based on a topographic model and a gravity anomaly model from the Scripps Institute of Oceanography. Characteristics of the isostatic anomaly and the earthquake dynamic environment of this region are analyzed, and the results show that there are obvious differences in the isostatic state between each block in the region. Tectonic movements are very intense in regions with high positive or negative isostatic gravity anomalies, and a number of sub-plates in this area are driven by external tectonic action, such as plate subduction and thrusting, of the Pacific, Indo-Australian and Eurasian plates. From the distribution of the isostatic gravity anomaly, the tectonic action of anti-isostatic movement obviously is the main source of power. Based on isostatic gravity and spatial distribution of earthquakes in the region, it is obvious that further contraction of the Indo-Australian Plate will result in the southwestern part of the Solomon Plate becoming part of the Owen Stanley thrust belt, and the northern part will enter the lower part of the Bismarck Plate. The eastern part of the Solomon Plate will enter the front of the Pacific Plate, resulting in northward and eastward migration of significant earthquakes along the Solomon Plate. Keywords: Papua New Guinea, New Britain Trench, Earthquake, Bouguer gravity anomaly, Isostatic gravity anomaly
url http://www.sciencedirect.com/science/article/pii/S1674984717301738
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