Characterization of Focal Mechanisms for Upper Crustal Distributed Seismicity in Aotearoa New Zealand

IF 2.6 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Seismological Research Letters Pub Date : 2023-10-26 DOI:10.1785/0220230196
Kiran Kumar Singh Thingbaijam, Mark S. Rattenbury, Russ J. Van Dissen, Matt C. Gerstenberger, John Ristau, Delphine D. Fitzenz
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引用次数: 1

Abstract

Abstract Applying distributed seismicity models for seismic hazard analysis requires postulating the styles of faulting and nodal planes for anticipated earthquakes. Here, we present a model describing focal mechanisms, or more specifically, strike, dip, and rake angles, for the ruptures of shallow (hypocentral depth ≤40 km) crustal earthquakes in Aotearoa New Zealand. This model is based on delineations of neotectonic domains and analysis of pre-existing datasets, including an active fault database, geological map-based fault datasets, the New Zealand Community Fault Model, and a regional moment tensor catalog. We demonstrate that the focal mechanism model is broadly consistent with the regional moment tensor catalog, with respect to spatial distributions of P and T axes and in terms of the Kagan angle. This characterization of focal mechanisms complements the distributed seismicity component of the New Zealand National Seismic Hazard Model 2022.
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新西兰奥特罗阿上地壳分布地震活动性的震源机制表征
摘要应用分布式地震活动性模型进行地震危险性分析,需要对预测地震的断层样式和节点面进行假设。在这里,我们提出了一个描述震源机制的模型,或者更具体地说,描述了新西兰Aotearoa浅层(震源深度≤40 km)地壳地震破裂的走向、倾角和前倾角。该模型基于新构造域的描绘和对已有数据集的分析,包括活动断层数据库、基于地质图的断层数据集、新西兰社区断层模型和区域矩张量目录。我们证明了震源机制模型在P轴和T轴的空间分布以及卡根角方面与区域矩张量目录大致一致。这种震源机制的特征补充了新西兰国家地震危险模型2022的分布式地震活动成分。
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来源期刊
Seismological Research Letters
Seismological Research Letters 地学-地球化学与地球物理
CiteScore
6.60
自引率
12.10%
发文量
239
审稿时长
3 months
期刊介绍: Information not localized
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