新西兰奥特罗阿的发震板震源模型

IF 2.6 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Kiran Kumar Singh Thingbaijam, Matt C. Gerstenberger, Chris Rollins, Russ J. Van Dissen, Sepideh J. Rastin, Annemarie Christophersen, John Ristau, Charles A. Williams, Delphine D. Fitzenz, Marco Pagani
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引用次数: 4

摘要

Hikurangi和Puysegur俯冲带的实验室内地震活动占新西兰Aotearoa记录的地震(Mw≥4.0事件)的50%。在这里,我们利用最近增强的数据集,包括俯冲界面几何模型、地震目录和区域矩张量目录,开发了一个实验室内地震活动性的源模型。对于均匀地震活动的区域,我们考虑了每个板块的整体,以及较浅(深度≤40 km)和较深区域之间的分界线。然后,我们评估了每个区域的震级-频率分布。为了计算平滑的地震活动分布,我们采用了一种新的准三维方法,其中包括:(1)中板表面的描绘(由最大地震密度区域定义),(2)震源在中板剖面上的正交投影,(3)中板上0.1°下倾的均匀网格,以及(4)在投影的震源上应用平滑核。我们还建立了一个利用区域矩张量表来描述岩内地震震源机制的模型。该模型中走向角与俯冲沟近平行,两个俯冲带中倾角均≥60°。前倾角的分布表明,Hikurangi板块浅部为张拉型,深层为挤压型,显示出板块的弯曲性。相比之下,Puysegur板块主要表现为挤压状态。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Seismogenic Slab Source Model for Aotearoa New Zealand
Abstract Intraslab seismicity within the Hikurangi and Puysegur subduction zones constitutes >50% of recorded (Mw≥4.0 events) earthquakes in Aotearoa New Zealand. Here, we develop a source model for intraslab seismicity using recently augmented datasets including models of subduction interface geometries, an earthquake catalog, and a regional moment tensor catalog. For the areal zones of uniform seismicity, we consider the whole of each slab, as well as demarcations between shallower (depth ≤40 km) and deeper regions. Thereafter, we evaluate the magnitude–frequency distributions in each zone. To compute smoothed seismicity distributions, we apply a novel quasi-3D approach that involve: (1) delineation of midslab surfaces (defined by regions of maximum earthquake density), (2) orthogonal projections of hypocenters onto the midslab profiles, (3) uniform gridding of 0.1° down-dip on the midslab, and (4) application of smoothing kernel on the projected hypocenters. We also develop a model to characterize the focal mechanisms of the intraslab earthquakes using the regional moment tensor catalog. This model has median strike angles subparallel to subduction trenches and median dip angles ≥60° in both the subduction zones. The distribution of rake angles suggests that the Hikurangi slab has an extensional regime in the shallower parts but a compressional regime in the deeper parts, indicative of slab flexure. In contrast, the Puysegur slab predominantly exhibits a compressional regime.
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来源期刊
Bulletin of the Seismological Society of America
Bulletin of the Seismological Society of America 地学-地球化学与地球物理
CiteScore
5.80
自引率
13.30%
发文量
140
审稿时长
3 months
期刊介绍: The Bulletin of the Seismological Society of America, commonly referred to as BSSA, (ISSN 0037-1106) is the premier journal of advanced research in earthquake seismology and related disciplines. It first appeared in 1911 and became a bimonthly in 1963. Each issue is composed of scientific papers on the various aspects of seismology, including investigation of specific earthquakes, theoretical and observational studies of seismic waves, inverse methods for determining the structure of the Earth or the dynamics of the earthquake source, seismometry, earthquake hazard and risk estimation, seismotectonics, and earthquake engineering. Special issues focus on important earthquakes or rapidly changing topics in seismology. BSSA is published by the Seismological Society of America.
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