Study on lithospheric strength of the Anatolian plateau and implications for strong earthquake activity in Turkey

IF 2.8 4区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Geodesy and Geodynamics Pub Date : 2023-11-01 DOI:10.1016/j.geog.2023.09.003

Pan Yuhang, Chen Shi, Shi Wen

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引用次数: 0

Abstract

On February 6, 2023, the doublet earthquake including two main shocks with magnitudes MW7.8 and MW7.5, occurred near the western side of the East Anatolian Fault at the southeast boundary of the Anatolian Plateau in Turkey. Based on the WGM2012 Bouguer gravity anomaly data and the Etopo1 topography data, this study first introduced a joint inversion of admittance and coherence functions and used the Bayesian optimal parameter estimation method to obtain the effective elastic thickness Te and loading ratio F of the lithosphere for various tectonic units in the Anatolian Plateau. Secondly, we discussed the characteristics and influencing factors of the lithospheric mechanical strength and analyzed its relationship with seismic activity. The lithospheric mechanical strength of the Anatolian Plateau showed clear lateral heterogeneity and a "weak-strong-weak" spatial pattern from east to west, reflecting various tectonic processes. At last, the strong seismic activity was found where the lithospheric strength was low in the Anatolian Plate. We also incorporated GPS strain rate and other results to investigate the tectonic background and primary causes of the MW7.8 and MW7.5 doublet earthquakes in Turkey. The results have a good insight into urban safety design in the Turkish region, including post-disaster rehabilitation, earthquake hazard assessment, and loss reduction.

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安纳托利亚高原岩石圈强度研究及其对土耳其强震活动的意义

2023年2月6日，土耳其安纳托利亚高原东南边界东安纳托利亚断裂带西侧附近发生MW7.8级和MW7.5级双重地震。基于WGM2012 bouger重力异常资料和Etopo1地形资料，首次引入导纳函数和相干函数联合反演，采用贝叶斯最优参数估计方法，得到了安纳托利亚高原各构造单元岩石圈有效弹性厚度Te和载荷比F。其次，讨论了岩石圈机械强度的特征和影响因素，并分析了其与地震活动的关系。安纳托利亚高原岩石圈机械强度表现出明显的横向非均质性和自东向西“弱-强-弱”的空间格局，反映了不同的构造过程。最后，在安纳托利亚板块岩石圈强度较低的地方发现了强烈的地震活动。结合GPS应变率等结果，探讨了土耳其MW7.8和MW7.5双重地震的构造背景和主要原因。研究结果对土耳其地区的城市安全设计，包括灾后重建、地震危害评估和减少损失有很好的启示。

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来源期刊

Geodesy and Geodynamics GEOCHEMISTRY & GEOPHYSICS-

CiteScore

4.40

自引率

4.20%

发文量

566

审稿时长

69 days

期刊介绍： Geodesy and Geodynamics launched in October, 2010, and is a bimonthly publication. It is sponsored jointly by Institute of Seismology, China Earthquake Administration, Science Press, and another six agencies. It is an international journal with a Chinese heart. Geodesy and Geodynamics is committed to the publication of quality scientific papers in English in the fields of geodesy and geodynamics from authors around the world. Its aim is to promote a combination between Geodesy and Geodynamics, deepen the application of Geodesy in the field of Geoscience and quicken worldwide fellows'' understanding on scientific research activity in China. It mainly publishes newest research achievements in the field of Geodesy, Geodynamics, Science of Disaster and so on. Aims and Scope: new theories and methods of geodesy; new results of monitoring and studying crustal movement and deformation by using geodetic theories and methods; new ways and achievements in earthquake-prediction investigation by using geodetic theories and methods; new results of crustal movement and deformation studies by using other geologic, hydrological, and geophysical theories and methods; new results of satellite gravity measurements; new development and results of space-to-ground observation technology.