The 2023 Turkey earthquake doublet: Earthquake relocation, seismic tomography, and stress field inversionOAEI
On February 6,2023,two earthquakes with magnitudes of M_(W) 7.8 and M_(W) 7.5 struck southeastern Turkey,causing significant casualties and economic losses.These seismic events occurred along the East Anatolian Fault Zone,a convergent boundary between the Arabian Plate and the Anatolian Subplate.In this study,we analyze the M_(W) 7.8 and M_(W) 7.5 earthquakes by comparing their aftershock relocations,tomographic images,and stress field inversions.The earthquakes were localized in the upper crust and exhibited steep dip angles.Furthermore,the aftershocks occurred either close to the boundaries of low and high P-wave velocity anomaly zones or within the low P-wave velocity anomaly zones.The East Anatolia Fault,associated with the M_(W) 7.8 earthquake,and the SürgüFault,related to the M_(W) 7.5 earthquake,predominantly experienced shear stress.However,their western sections experienced a combination of strike-slip and tensile stresses in addition to shear stress.The ruptures of the M_(W) 7.8 and M_(W) 7.5 earthquakes appear to have bridged a seismic gap that had seen sparse seismicity over the past 200 years prior to the 2023 Turkey earthquake sequence.
HuiLi Zhan;Ling Bai;Bagus Adi Wibowo;ChaoYa Liu;Kazuo Oike;Yuzo Ishikawa;
State Key Laboratory of Tibetan Plateau Earth System,Environment and Resources(TPESER),Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China University of Chinese Academy of Sciences,Beijing 100049,ChinaState Key Laboratory of Tibetan Plateau Earth System,Environment and Resources(TPESER),Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China University of Chinese Academy of Sciences,Beijing 100049,China Center of Earthquake and Tsunami,Agency of Meteorology,Climatology and Geophysics,Jakarta 10610,IndonesiaUniversity of Shizuoka,Shizuoka 422-8526,JapanShizuoka University,Shizuoka 422-8529,Japan
地球科学
Turkey earthquake doubletearthquake relocationseismic tomographystress fieldseismicity
《Earth and Planetary Physics》 2024 (003)
P.535-548 / 14
the editor and two anonymous reviewers for their comments,which improved the quality of the manuscript.This research was supported by grants from the National Natural Science Foundation of China(Grant Nos.42130312 and 41988101-01);the Second Tibetan Plateau Scientific Expedition and Research Program(Grant No.2019QZKK07);The focal mechanisms were obtained from the gCMT(https://www.globalcmt.org/CMTsearch.html,last accessed June 2023)and AFAD(https://deprem.afad.gov.tr/event-focal-mechanism,last accessed June 2023).The earthquake catalog and arrival time data were acquired from AFAD(https://deprem.afad.gov.tr/event-catalog,last accessed June 2023).The coseismic offset measurements of GNSS for the 2023 Turkey earthquake doublet are available from the NGL(http://geodesy.unr.edu/,last accessed October 2023;http://geodesy.unr.edu/news_items/20230213/us6000jllz_final5 min.txt;http://geodesy.unr.edu/news_items/20230213/us6000-jlqa_final5min.txt);The catalog for large earthquakes with MW≥5.0 were downloaded from Utsu(2002),the USGS(https://earthquake.usgs.gov/earthquakes/search/,last accessed February 2023),and AFAD;The Generic Mapping Tools(GMT;Wessel et al.,2013)and Seis-PC(Ishikawa,1986)software were used to plot some of the figures.The Supplemental Material includes seven figures and one table that supplement the main article.
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