使用P波层析成像和表面波多通道分析表征Carrascoy断层系统(伊比利亚半岛东南部)的浅层地下结构

IF 1.3 4区 地球科学 Q2 GEOLOGY Geologica Acta Pub Date : 2022-09-08 DOI:10.1344/geologicaacta2022.20.9
H. Handoyo, I. DeFelipe, R. Martín-Banda, J. García-Mayordomo, D. Martí, J. J. Martínez-Díaz, J. Insua-Arévalo, Teresa Teixidó, J. Alcalde, I. Palomeras, R. Carbonell
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引用次数: 2

摘要

伊比利亚半岛东南部的地震活动平行于海岸分布在一个发育良好的走滑断裂系统中,该系统被称为东Betic剪切带(EBSZ)。本工作的重点是EBSZ Carrascoy断层系统内Algezares Casas Nuevas断层浅层地下结构的特征。Carrascoy断层以南与Guadalentín凹陷接壤,这是一个人口稠密、农业活动广泛的地区。因此,该断层系统代表了一种具有重大社会和经济意义的地震灾害。基于地震反射数据的P波层析成像和多通道表面波分析,我们建立了两个速度-深度模型。由此产生的速度模型使我们能够解释最初~250m的深度,并揭示了:i)临界区的厚度;ii)Algezares Casas Nuevas断层的几何形状;iii)Messinian/Tortonian接触的深度,以及iv)Guadalentín凹陷下盲冲断层和破坏带的存在。我们的研究结果还帮助我们估计了自209.1±6.2ka以来Algezares Casas Nuevas断层的表观垂直滑动速率为0.66±0.06m/ky,并可用于改进世界各地构造活动区的地震危险性评估。
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Characterization of the shallow subsurface structure across the Carrascoy Fault System (SE Iberian Peninsula) using P-wave tomography and Multichannel Analysis of Surface Waves
The seismicity in the SE Iberian Peninsula is distributed parallel to the coast in a well-developed strike-slip fracture system known as the Eastern Betic Shear Zone (EBSZ). This work focuses on the characterization of the shallow subsurface structure of the Algezares-Casas Nuevas Fault, within the Carrascoy Fault System of the EBSZ. The Carrascoy Fault borders the Guadalentín Depression to the south, which is a densely populated area with extensive agricultural activity. Therefore, this faults system represents a seismic hazard with significant social and economic implications. We have constructed two velocity-depth models based on P-wave tomography and Multichannel Analysis of Surface Waves (MASW) acquired from seismic reflection data. The resulting velocity models have allowed us to interpret the first ~250m depth and have revealed: i) the thickness of the critical zone; ii) the geometry of the Algezares-Casas Nuevas Fault; iii) the depth of the Messinian/Tortonian contact and iv) the presence of blind thrusts and damage zones under the Guadalentín Depression. Our results have also helped us to estimate an apparent vertical slip rate of 0.66±0.06m/ky for the Algezares-Casas Nuevas Fault since 209.1±6.2ka. Our results provide a methodological and backflow protocol to study the shallow subsurface of active faults, complementing previous geological models based on paleoseismological trenches, and can be used to improve the seismic hazard assessment of tectonically active regions around the world.
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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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