Lithospheric strength of the Anatolian plateau and implications for strong earthquake activity in Turkey  

作　　者：Yuhang Pan Shi Chen Wen Shi 

机构地区：[1]Institute of Geophysics,China Earthquake Administration,Beijing 100081,China [2]Beijing Baijiatuan Earth Science National Observation and Research Station,Beijing 100095,China

出　　处：《Geodesy and Geodynamics》2024年第3期209-218,共10页大地测量与地球动力学（英文版）

基　　金：funded by the National Natural Science Foundation of China (Grant Nos.U1939205,41974095);the Basic Research Fund of the Institute of Geophysics,China Earthquake Administration (Grant Nos.DQJB21R30)。

摘　　要：On February 6, 2023, the doublet earthquake including two main shocks with magnitudes M_(W)7.8 and M_(W)7.5, 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 Etopo1topography 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 Teand 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 M_(W)7.8 and M_(W)7.5 doublet earthquakes in Turkey. The results have a good insight into urban safety design in the Turkish region, including postdisaster rehabilitation, earthquake hazard assessment, and loss reduction.

关 键 词：Effective elastic thickness Anatolian plateau Turkey doublet earthquakes Bayesian optimization 

分 类 号：P315[天文地球—地震学]