印度尼西亚新几内亚西北部鸟头半岛东北部Ransiki地震:斜板块会聚中的变形划分

IF 2.1 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Sukahar Eka Adi Saputra , Christopher L. Fergusson , Colin V. Murray-Wallace
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引用次数: 0

摘要

新几内亚西北部太平洋卡罗琳板块和澳大利亚板块之间的板块边界与鸟头半岛东北部(巴布亚西部,新几内亚西北部)Ransiki和Yapen断层交汇处的地震地理集中有关。我们根据区域地貌和岩石地层框架、地表破裂和液化现象的现场观测以及历史地震的震源机制来研究这些地震。Ransiki地震是1977年至2019年期间全球质心矩张量目录中的29次地震(震级为Mw4.9至Mw7.5)。在东部,震源机制显示沿东西走向的Yapen断层的左旋运动,包括2012年4月21日的Mw6.7地震。最大的地震发生在2002年10月10日(Mw7.5),与主要发生在西南部的其他地震一起,与位于其与Yapen断层交叉口以南的西北走向Ransiki断层的震源机制解所示的右旋运动有关。因此,Ransiki断层的南部表明了局部的东北偏北挤压,这在Yapen岛以南新发现的Wainoei断层中也很明显。两次最大的地震(2002年10月10日和2012年4月21日)显示了与液化有关的地面效应,表现为地表偏移、开放裂缝和吹沙,所有这些都发生在Ransiki三角洲的饱和沉积物中。Ransiki地区的地震表明,澳大利亚板块和太平洋Caroline板块之间的西-西南斜向板块会聚分为沿Yapen断层的东西向左旋走滑运动和与Ransiki断层相关的东北偏北挤压。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Ransiki earthquakes, northeastern Bird’s Head Peninsula, northwestern New Guinea, Indonesia: Deformation partitioning in oblique plate convergence

Ransiki earthquakes, northeastern Bird’s Head Peninsula, northwestern New Guinea, Indonesia: Deformation partitioning in oblique plate convergence

The plate boundary between the Pacific-Caroline and Australian plates in northwestern New Guinea is associated with a geographic concentration of earthquakes developed in the Ransiki region of the northeastern Bird’s Head Peninsula (West Papua, northwestern New Guinea) at the intersection of the Ransiki and Yapen faults. We examine these earthquakes based on regional geomorphological and lithostratigraphical frameworks, field observations of surface ruptures and liquefaction phenomena, and focal mechanisms of historical earthquakes. The Ransiki earthquakes are a set of 29 earthquakes from the Global Centroid Moment Tensor catalogue in the period 1977–2019 (magnitudes of Mw4.9 to Mw7.5). In the east, focal mechanisms show sinistral movement along the east-west trending Yapen Fault including the Mw6.7 earthquake on 21 April 2012. The largest earthquake was on 10 October 2002 (Mw7.5) and along with other earthquakes mainly in the southwest were associated with dextral movement indicated by focal mechanism solutions on the northwest trending Ransiki Fault south of its intersection with the Yapen Fault. The southern part of the Ransiki Fault therefore indicates local north-northeast compression that is also evident in the newly recognised Wainoei Fault south of Yapen Island. The two largest earthquakes (10 October 2002, 21 April 2012) show ground effects associated with liquefaction, indicated by surface offsets, open fissures, and sand blows, that all occurred in saturated sediments of the Ransiki delta. Earthquakes in the Ransiki region show that west-southwest oblique plate convergence between the Australian and Pacific-Caroline plates is partitioned into east-west sinistral strike-slip motion along the Yapen Fault and north-northeast compression associated with the Ransiki Fault.

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来源期刊
Journal of Geodynamics
Journal of Geodynamics 地学-地球化学与地球物理
CiteScore
4.60
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: The Journal of Geodynamics is an international and interdisciplinary forum for the publication of results and discussions of solid earth research in geodetic, geophysical, geological and geochemical geodynamics, with special emphasis on the large scale processes involved.
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