使用匹配定位方法表征2019年7月加利福尼亚州里奇克莱斯特MW6.4地震的前震

IF 1.2 4区 地球科学 Q3 Earth and Planetary Sciences
Min Liu , Miao Zhang , Hongyi Li
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引用次数: 0

摘要

2019年7月加利福尼亚州里奇克莱斯特MW6.4地震及其不同的前震被当地和区域台站很好地记录下来,为描述其前震特征和研究主震的成核机制提供了很好的机会。本研究采用匹配定位(M&L)方法建立了本次MW6.4级地震的高精度前震目录。与序列定位方法(匹配过滤器+基于交叉相关的hypoDD)相比,我们的新目录包含更多的事件,定位精度更高。MW6.4主震之前在2小时内发生了40次前震(2019年7月4日15:35:29至17:32:52,UTC)。它们的时空分布揭示了一个由多断层链组成的复杂孕震结构,这些断层链被后来的前震连接成贯穿断层,最终容纳了2019年MW6.4主震。为了更好地理解成核机制,我们利用M&L法计算了最大ML4.0前震的初始破裂点和质心点,确定了其破裂尺寸。通过对库仑应力变化的估计,我们认为ML4.0和MW6.4主震后的前震大部分发生在库仑应力增加的区域内,表明它们是由应力传递引发的。由于波形采样率不足和事件震级小,ML4.0事件前的成核过程尚不清楚。因此,我们的研究表明,M&L方法具有优越的检测和定位能力,在需要高精度定位的研究(例如,地震成核)中显示出潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Using the match-and-locate method to characterize foreshocks of the July 2019 MW6.4 Ridgecrest, California earthquake

The July 2019 MW6.4 Ridgecrest, California earthquake and its distinct foreshocks were well recorded by local and regional stations, providing a great opportunity to characterize its foreshocks and investigate the nucleation mechanisms of the mainshock. In this study, we utilized the match-and-locate (M&L) method to build a high-precision foreshock catalog for this MW6.4 earthquake. Compared with the sequential location methods (matched-filter + cross-correlation-based hypoDD), our new catalog contains more events with higher location accuracy. The MW6.4 mainshock was preceded by 40 foreshocks within ∼2 h (on July 4, 2019 from 15:35:29 to 17:32:52, UTC). Their spatiotemporal distribution revealed a complex seismogenic structure consisting of multiple fault strands, which were connected as a throughgoing fault by later foreshocks and eventually accommodated the 2019 MW6.4 mainshock. To better understand the nucleation mechanism, we determined the rupture dimension of the largest ML4.0 foreshock by calculating its initial rupture and centroid points using the M&L method. By estimating Coulomb stress change we suggested that the majority of foreshocks following the ML4.0 event and MW6.4 mainshock occurred within regions of increasing Coulomb stress, indicating that they were triggered by stress transfer. The nucleation process before the ML4.0 event remains unclear due to the insufficient sampling rate of waveforms and small magnitude of events. Thus, our study demonstrates that the M&L method has superior detection and location ability, showing potential for studies that require high-precision location (e.g., earthquake nucleation).

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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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