埃尔比斯坦地震的地质位置、构造表现以及土耳其东部 2023 年 2 月 6 日两次最强地震的构造比较

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Geotectonics Pub Date : 2024-07-30 DOI:10.1134/s0016852124700250
Ya. I. Trikhunkov, H. Ҫelik, V. S. Lomov, V. G. Trifonov, D. M. Bachmanov, Y. Karginoglu, S. Yu. Sokolov
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引用次数: 0

摘要

世界协调时 2023 年 2 月 6 日 10 时 24 分,安纳托利亚东部地区发生了埃尔比斯坦(恰尔达克)地震,震级为 7.5 或 7.6 级,这是继同日 1 时 17 分在该地区南部发生的东安纳托利亚(帕扎克)最强地震(震级为 7.8 级)之后的又一次地震。Elbistan 地震激活了 Chardak 断层和 Uluova 断层的相邻地段,造成左侧走向滑动位移。由此产生的地震断裂总长度为 190 公里,其中 148 公里为正弦侧滑。震中以东 8 公里处记录到的最大振幅为 7.84 米。埃尔比斯坦地震和东安纳托利亚地震的走向滑动地震断裂代表着其震中区暴露在陆地表面。这两次地震在震源区大小和地震位移振幅方面都超过了走向滑动型大陆地震这些参数的平均值。同时,两个震源的传播深度均未超过地壳上部(16-20 千米)。覆盖相同深度的蛇绿岩集合体广泛分布在两次地震的震源区内。沿埃尔比斯坦地震震中区的地震走向滑动位移分布有两个最大值:(i) 查尔达克断层区的振幅为 5.7-7.84 米;(ii) 乌卢瓦断层区的振幅为 3.5-5.1 米。这两个最大值都与蛇绿岩或其与基底岩接触的区域相吻合。在结晶基底岩石中,正弦走向滑动振幅明显减小。我们将这两次地震中焦点区面积和位移振幅值的增加归因于蛇绿岩的流变特征,这增加了岩石在地震运动中滑动的可能性。我们将两次地震的震源仅覆盖地壳上部这一事实解释为 P 波速度降低的岩石(包括上地幔和地壳下部)顶部的隆起,并将其解释为强度降低的受热岩石。
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Geological Position, Structural Manifestations of the Elbistan Earthquake and Tectonic Comparison of Two Strongest 06.02.2023 Seismic Events in Eastern Turkiye

Abstract

The Elbistan (Chardak) earthquake with magnitude Mw = 7.5 or 7.6 happened in Eastern Anatolia on 06.02.2023 at 10:24 UTC, following the strongest in the region of East Anatolian (Pazarcık) earthquake with Mw = 7.8 which occurred on the same day at 1:17 UTC to the south of the region. The Elbistan earthquake activated adjacent segments of the Chardak and Uluova faults with left-lateral strike-slip displacements. The resulting seismic ruptures have a total length of 190 km, of which 148 km are represented by sinistral lateral slip. Their maximum amplitude of 7.84 m was recorded 8 km east of the epicenter. The strike-slip seismic ruptures of the Elbistan and East Anatolian earthquakes represent exposure of their focal zones on the land surface. Both earthquakes exceed average values of these parameters for continental earthquakes of strike-slip type in terms of focal zone sizes and amplitudes of seismic displacements. At the same time, both sources do not propagate deeper than the upper part of the crust (16–20 km). Ophiolite assemblages covering the same depths are widely spread in the area of focal zones of both earthquakes. Two maxima were found in the distribution of seismic strike-slip displacement along the epicentral zone of the Elbistan earthquake (i) amplitudes of 5.7–7.84 m in the Chardak fault zone and (ii) amplitudes of 3.5–5.1 m in the Uluova fault zone. Both maxima coincide with the areas of ophiolites or their contacts with basement rocks. In crystalline basement rocks, the sinistral strike-slip amplitudes are significantly reduced. We attribute the increased values of focal zone sizes and displacement amplitudes of both earthquakes to the rheological features of ophiolites, which increase a possibility rocks slipping during seismic movements. We explain the fact that the sources of both earthquakes cover only the upper part of the crust by the uplift of the top of rocks with reduced P-wave velocities, including the upper mantle and the lower part of the crust, and interpret them as heated rocks with reduced strength.

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来源期刊
Geotectonics
Geotectonics 地学-地球化学与地球物理
CiteScore
1.90
自引率
9.10%
发文量
28
审稿时长
3 months
期刊介绍: Geotectonics publishes articles on general and regional tectonics, structural geology, geodynamics, and experimental tectonics and considers the relation of tectonics to the deep structure of the earth, magmatism, metamorphism, and mineral resources.
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