探究2023年2月6日土耳其7.8级双震的成因

doi:10.12196/j.issn.1000-3274.2024.03.001

Abstract

Abstract: Generation of the double M_S7.8 earthquakes of 6 February 2023 in southern Türkiye was comprehensively studied based on the crust structure and seismogeologic, geophysical and geothermal fluid geochemistry data as well as the spatial-temporal characteristics of the seismic sequence occurrences, in order to improve earthquake prediction and earthquake generation research. The double M7.8 earthquakes took place on 6 February 2023 in southern Türkiye, companying dozens of M≥5.0 earthquakes and several thousands of M<5.0 aftershocks in the duration of 6—17 February. Depths of the earthquakes focus range from 5 km to 22 km. The earthquake epicenters predominantly distributed in two belts in an area of about 500 km×300 km. One belt of NE trending has a length of 300 km and width of 40 km, another belt of EW trending has a length of 240 km and width of 50 km. Existences of low velocity and resistivity zone in the crust, high heat flow anomaly, negative Bouguer gravity anomaly, aeromagnetic anomaly and the deep-cut fault zones in the study area indicate that there are the necessary requirements for mantle-derived fluid accumulation and formation of super-pressure fluid bodies in the lithosphere of the area. The process of locally mantle-derived fluid accumulation to build super-pressure fluid bodies can be considered as the process of seismogenesis. The periodical accumulation of earthquake hypocenters in space and variations of the hypocenter depths during 6—17 February indicated that increasing supplement of high-energy-density fluids derived from the mantle to the earthquake source bodies, resulted in repeated increases of fluid pressure. Cryptoexplosion occurred when the fluid pressure in the source bodies exceeded the strength of the surrounding rocks (compressive strength + hydrostatic pressure), producing earthquakes. The high-energy-density fluids migrated in the way of the inflate-explosion-deflate-inflate-explosion-deflate cycle, which produced the M7.8 double earthquakes and aftershocks. Therefore, the M7.8 double earthquakes and M≥4.0 aftershocks occurring in the discontinuous inelastic source bodies in the small region can be reasonably explained from the view of energy source and seismogenesis of geothermal fluid explosion.

Key words: Double M7.8 earthquakes, Cryptoexplosion, Mantle-derived fluids, Seismopregnant process of geothermal fluids, Seismogenesis, Türkiye

CLC Number:

P594.1

GUO Gui-juan, SUN Feng-xia, DU Jian-guo. Investigating Generation of the February 6, 2023 M7.8 Double Earthquakes in Türkiye[J]. EARTHQUAKE, 2024, 44(3): 1-20.

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Investigating Generation of the February 6, 2023 M7.8 Double Earthquakes in Türkiye

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