2021 年 10 月 7 日巴基斯坦哈尔奈 M5.9 级地震的震源参数和余震模式

IF 1.2 4区 地球科学 Q3 Earth and Planetary Sciences
Mohammad Tahir, Zeeshan Ahmad, Sadia Sabahat, Muhammad Naveed Mushtaq, Talat Iqbal, Muhammad Ali Shah, Alam Aftab
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引用次数: 0

摘要

2021 年 10 月 7 日,巴基斯坦哈尔奈(俾路支斯坦)地区发生 5.9 级地震,震中地区有数人伤亡。该地区的一阶构造变形是由印度板块相对于欧亚板块的汇聚造成的。卡特瓦兹块阻碍了印度板块的运动,从而形成了走向滑动断层。在这项研究中,采用了 P 波初动极性技术来确定主震断层类型。对极性解进行循环扫描,以确定 FOCMEC(焦点机制)软件生成的可用解中最合适的焦点机制解。节点平面对应于不同的断层类型(即推力断层和走向滑动断层)。西北-东南方向的节点面对应于走向滑动机制,被认为是断层面。从构造上看,由于断层走向和滑动方向,此次地震与哈奈-卡拉希走向滑动断层带有关。哈奈地震的表观应力降、断层长度和力矩大小分别为 35.4 巴、6.1 千米和 5.9。地震前,古腾堡-里希特定律的 b 值较低。α值高于b值(α >b),表明这次地震是由大震级事件而不是小震级事件引起的。哈奈序列的衰减指数接近统一,持续时间为 145 天,产生的余震很少。这项研究将有助于该地区未来的减灾工作。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Source parameters and aftershock pattern of the October 7, 2021, M5.9 Harnai earthquake, Pakistan

On October 7, 2021, a magnitude 5.9 earthquake struck the Harnai (Baluchistan) region of Pakistan, causing several fatalities and injuries within the epicentral area. First-order tectonic deformation in this region is caused by the convergence of the Indian Plate with respect to the Eurasian Plate. The Katwaz Block hinders the motion of the Indian Plate, resulting in the formation of strike-slip faults. In this study, the P-wave first-motion polarity technique was used to determine the mainshock faulting style. Cyclic scanning of the polarity solutions was applied to determine the most suitable focal mechanism solution among the available solutions generated by the FOCMEC (focal mechanism) software. The nodal planes correspond to different faulting styles (i.e., thrust and strike-slip faulting). A nodal plane oriented in the NW-SE direction corresponded to a strike-slip mechanism, which was considered to be the fault plane. Tectonically, this earthquake was associated with the Harnai-Karahi strike-slip fault zone owing to the fault strike and direction of slip. The apparent stress drop, fault length, and moment magnitude of the Harnai earthquake were 35.4 bar, 6.1 km, and 5.9, respectively. A lower b-value for the Gutenberg-Richter law was observed prior to the earthquake. Higher α- than b-values (α > b) indicate that this earthquake was governed by large events as opposed to small-magnitude events. The Harnai sequence had a decay exponent close to unity, lasted for 145 days, and produced few aftershocks. The study will help the future hazard mitigation in the region.

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来源期刊
Earthquake Science
Earthquake Science GEOCHEMISTRY & GEOPHYSICS-
CiteScore
1.10
自引率
8.30%
发文量
42
审稿时长
3 months
期刊介绍: Earthquake Science (EQS) aims to publish high-quality, original, peer-reviewed articles on earthquake-related research subjects. It is an English international journal sponsored by the Seismological Society of China and the Institute of Geophysics, China Earthquake Administration. The topics include, but not limited to, the following ● Seismic sources of all kinds. ● Earth structure at all scales. ● Seismotectonics. ● New methods and theoretical seismology. ● Strong ground motion. ● Seismic phenomena of all kinds. ● Seismic hazards, earthquake forecasting and prediction. ● Seismic instrumentation. ● Significant recent or past seismic events. ● Documentation of recent seismic events or important observations. ● Descriptions of field deployments, new methods, and available software tools. The types of manuscripts include the following. There is no length requirement, except for the Short Notes. 【Articles】 Original contributions that have not been published elsewhere. 【Short Notes】 Short papers of recent events or topics that warrant rapid peer reviews and publications. Limited to 4 publication pages. 【Rapid Communications】 Significant contributions that warrant rapid peer reviews and publications. 【Review Articles】Review articles are by invitation only. Please contact the editorial office and editors for possible proposals. 【Toolboxes】 Descriptions of novel numerical methods and associated computer codes. 【Data Products】 Documentation of datasets of various kinds that are interested to the community and available for open access (field data, processed data, synthetic data, or models). 【Opinions】Views on important topics and future directions in earthquake science. 【Comments and Replies】Commentaries on a recently published EQS paper is welcome. The authors of the paper commented will be invited to reply. Both the Comment and the Reply are subject to peer review.
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