Study of the rupture processes of the 1989 (Mw 6.9) and 2021 (Mw 7.0) Guerrero earthquakes using teleseismic records: Sismotectonic implications

IF 1.3 4区 地球科学 Q2 GEOLOGY
Rosario Martínez
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引用次数: 0

Abstract

Slip models of the April 25, 1989 (Mw 6.9) earthquake and the Acapulco earthquake of September 8, 2021 (Mw 7.0) were determined to analyze its rupture zone and understand the relationship of interplate earthquakes in the Acapulco–San Marcos subduction zone. For both events, velocity P and SH waves recorded at teleseismic distances were modeled. For the 1989 San Marcos event, two slip zones were determined with a maximum slip of 121cm, a stress drop of 8bars and a rupture duration of approximately 13s. This event showed a complex rupture. For the 2021 Acapulco event, a zone of maximum slip of 267cm, a stress drop of 5bars, and a rupture duration of approximately 24s were determined. Analysis of rupture zones suggests that complex events occur in the Acapulco–San Marcos subduction zone. Therefore, these results have important implications in seismic potential studies since the source parameters are critical.
利用远震记录研究1989年(Mw 6.9)和2021年(Mw 7.0)格雷罗地震的破裂过程:地壳构造意义
利用1989年4月25日(Mw 6.9)地震和2021年9月8日(Mw 7.0)阿卡普尔科地震的滑动模型分析了其破裂带,并了解了阿卡普尔科-圣马科斯俯冲带的板块间地震关系。对于这两个事件,在远震距离记录的速度P波和SH波进行了模拟。在1989年的圣马科斯地震中,确定了两个滑移带,最大滑移量为121厘米,应力降为8巴,破裂持续时间约为13秒。这一事件显示了一次复杂的破裂。对于2021年的阿卡普尔科事件,确定了最大滑移区为267厘米,应力降为5巴,破裂持续时间约为24秒。对破裂带的分析表明,在阿卡普尔科-圣马科斯俯冲带发生了复杂的事件。因此,这些结果对地震潜力研究具有重要意义,因为震源参数是至关重要的。
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来源期刊
Geologica Acta
Geologica Acta 地学-地质学
CiteScore
2.50
自引率
6.70%
发文量
13
审稿时长
>12 weeks
期刊介绍: - Relevant conceptual developments in any area of the Earth Sciences. - Studies presenting regional synthesis. - Thematic issues or monographic volumes presenting the results from one or more research groups. - Short papers reflecting interesting results or works in progress. - Contributions and results from Research Projects, Workshops, Symposiums, Congresses and any relevant scientific activity related to Earth Sciences. - Geologica Acta aims to stimulate rapid diffusion of results and efficient exchange of ideas between the widespread communities of Earth Science researchers (with special emphasis on Latinamerica, the Caribbean, Europe, the Mediterranean
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