The Induced Seismicity Effect in Morocco Caused by a Reduced Aquifers Volume according to Stacking-InSAR Method and Gravimetric Data

IF 0.7 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Doklady Earth Sciences Pub Date : 2024-05-02 DOI:10.1134/s1028334x24601809

V. G. Bondur, T. N. Chimitdorzhiev, A. V. Dmitriev

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Abstract

The geodynamics at the epicenter of the destructive Mw = 6.8 earthquake that occurred in Morocco on September 8, 2023, was studied by the Stacking-InSAR method applied to 801 interferograms based on the Sentinel-1 synthetic aperure radar (SAR) data. Over the period from January 2019 to September 2023, local subsidence of the surface with an average velocity of 1.5 cm/yr was discovered. The maximum velocity obtained in 2023 reached 24 cm/yr in the areas with a developed melioration system located above aquifers. Based on the integrated analysis of variations in the water equivalent thickness measured from the 2000–2023 satellite gravimetric data and the amount of precipitation, the surface subsidence was found to be due to a significant withdrawal of water from aquifers. Assuming similar shapes of isoseists of earthquakes with close epicenters, the isoseists of the earthquakes that occurred in 2014 and 2023 were compared. The data obtained made it possible to identify the expansion of isoseist contours toward the descending surface areas of the 2023 earthquake. This process, along with the tectonic movements of the Eurasian and Nubian plates, is believed to have increased the stress–strain state between two aquifers and finally caused the Mw = 6.8 earthquake in Morocco on September 8, 2023.

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根据叠加-InSAR 方法和重力测量数据得出的含水层容积减少在摩洛哥造成的诱发地震效应

摘要利用基于哨兵-1 号合成孔径雷达（SAR）数据的 801 张干涉图，采用叠加-InSAR 方法研究了 2023 年 9 月 8 日在摩洛哥发生的 Mw = 6.8 破坏性地震震中的地球动力学。在 2019 年 1 月至 2023 年 9 月期间，发现地表局部下沉，平均速度为 1.5 厘米/年。在含水层上方的融化系统发达地区，2023 年获得的最大下沉速度达到 24 厘米/年。根据对 2000-2023 年卫星重力测量数据测得的水等效厚度变化和降水量的综合分析，发现地表下沉是由于含水层大量取水造成的。假定震中相近的地震等距线形状相似，对 2014 年和 2023 年发生的地震等距线进行了比较。根据所获得的数据，可以确定 2023 年地震的等深线等值线向地表下降区域扩展。这一过程，以及欧亚板块和努比亚板块的构造运动，被认为增加了两个含水层之间的应力应变状态，并最终导致了 2023 年 9 月 8 日在摩洛哥发生的 Mw = 6.8 地震。

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来源期刊

Doklady Earth Sciences 地学-地球科学综合

CiteScore

1.40

自引率

22.20%

发文量

138

审稿时长

3-6 weeks

期刊介绍： Doklady Earth Sciences is a journal that publishes new research in Earth science of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.