用于伊比利亚南部和地中海最西部绝对下沉中心定位的新型三维速度模型 (mTAB3D)

IF 2.9 3区 地球科学 Q2 ASTRONOMY & ASTROPHYSICS
José Luis Sánchez-Roldán, José A. Álvarez-Gómez, José J. Martínez-Díaz, Paula Herrero-Barbero, Hector Perea, Juan V. Cantavella, Lucía Lozano
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引用次数: 0

摘要

跨阿尔伯兰剪切带是地中海最西端地震最活跃的地区之一,在欧亚板块和非洲板块斜向交汇的背景下,这里形成了各种各样的构造域。在这一地区,地震多发生在地震构造附近,其中一些构造足以造成破坏性地震。此外,构造域的多样性意味着地震波传播的横向变化,如果在定位过程中不加以解决,可能会影响低中心的可靠性。我们介绍了 mTAB3D,这是一种新的三维 P 波速度,是在我们的研究区域进行数据收集、几何建模和速度估算后创建的。为了测试该模型,我们使用了西班牙地震网络目录中的到达时间,并进行了两次非线性绝对低中心反演:第一次反演包括 2018-2022 年期间在东贝蒂奇剪切带检测到的所有地震;第二次反演包括在 Al-Hoceima 地震序列(2016 年)中记录到的地震。我们将我们的结果与该地区的一维速度模型(mIGN1D)计算出的低中心进行了比较,发现 mTAB3D 在活动结构附近实现了更好的聚类,并降低了震中不确定性(低达 11%)。此外,即使在方位角间隙较小的情况下,如2016年的Al-Hoceima序列,用mTAB3D获得的低纬度中心也显示出显著的可靠性。利用我们的模型计算出的新目录有助于我们推断研究区域内地震活动与震源断层之间可能存在的遗传关系,并可作为研究先前地震序列的额外工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

New 3D Velocity Model (mTAB3D) for Absolute Hypocenter Location in Southern Iberia and the Westernmost Mediterranean

New 3D Velocity Model (mTAB3D) for Absolute Hypocenter Location in Southern Iberia and the Westernmost Mediterranean

The Trans-Alboran Shear Zone is one of the most seismically active areas in the westernmost Mediterranean, where a wide variety of tectonic domains have developed within the context of oblique convergence between Eurasia and Africa plates. In this region, earthquakes occur close to seismogenic structures, some of them large enough to cause damaging events. In addition, the diversity of tectonic domains implies a lateral variation of seismic wave propagation, which could affect the hypocenter reliability if not addressed during the location procedure. We present mTAB3D, a new 3D P-wave velocity created after data collection, geometry modeling and velocity estimation in our study area. To test this model, we used arrival times from the Spanish Seismic Network catalog and performed two non-linear absolute hypocenter inversions: the first comprises all the seismicity detected during 2018–2022 in the Eastern Betics Shear Zone; the second one consists of the earthquakes recorded during the Al-Hoceima seismic sequence (2016). We compare our results against hypocenters computed with a 1D velocity model of the region (mIGN1D) and observe that mTAB3D achieves better clustering near active structures and lower epicentral uncertainties (up to 11% lower). Moreover, hypocenters obtained with mTAB3D show notable reliability even in scenarios of a low azimuthal gap, such as the 2016 Al-Hoceima sequence. The new catalogs computed with our model help us to infer possible genetic relations between seismicity and source faults within our study area and can be used as an additional tool when looking into prior seismic sequences.

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来源期刊
Earth and Space Science
Earth and Space Science Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
5.50
自引率
3.20%
发文量
285
审稿时长
19 weeks
期刊介绍: Marking AGU’s second new open access journal in the last 12 months, Earth and Space Science is the only journal that reflects the expansive range of science represented by AGU’s 62,000 members, including all of the Earth, planetary, and space sciences, and related fields in environmental science, geoengineering, space engineering, and biogeochemistry.
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