2023 年 2 月 6 日 Elbistan-Ekinözü(Kahramanmaraş)7.6 级地震期间的地表破裂:对东安纳托利亚断层带北部分支沿线断层破裂动力学的影响

IF 1.3 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Turkish Journal of Earth Sciences Pub Date : 2024-01-04 DOI:10.55730/1300-0985.1895
Mustafa Softa, Fikret Koçbulut, Elif Akgün, Ercan Aksoy, H. Sözbilir, O. Tatar, Volkan Karabacak, Ç. Özkaymak, Mehmet Utku, Ö. Özdağ, Recep Çakir, Ahmet Demir, Gökhan Arslan
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引用次数: 0

摘要

:2023 年 2 月 6 日,土耳其发生了 7.7 级 Pazarcık 地震(卡赫拉曼马拉什)和 7.6 级 Ekinözü地震(卡赫拉曼马拉什),这些破坏性地震在同一天填补了东安纳托利亚断裂带现有的地震缺口。第一次威力为 7.7 级的地震使大多数人在睡梦中惊醒,9 小时后又引发了第二次地震,最终造成 5 万多人死亡、大面积建筑物损坏和大规模山体滑坡。本研究介绍了 2023 年 2 月 6 日埃基诺祖(土耳其卡赫拉曼马拉什)地震(震级 7.6)发生后,通过现场观测确定的地表破裂几何形状和共震位移特征。初步影响显示,在被称为东安纳托利亚断裂带北部分支的恰尔达克(Çardak)段和多安谢希尔(Doğanşehir)段,断裂总长度为 130 ± 10 公里。左侧走向滑动断层发育,最大水平位移为 6.60 米,平均位移为 3.00 米。此外,在恰尔达克地段,地表断裂在小尺度上呈现出约束弯曲和释放弯曲结构。从这一点来看,我们的初步研究结果表明,Çardak 和 Doğanşehir 地段在威力为 7.6 级的 Ekinözü (Kahramanmaraş)地震中连续断裂,地震在 Göksun 和 Nurhak 地区之间发生,并从那里到达 Eskiköy 地区。此外,潜在应力不仅可能集中在位于东安纳托利亚断裂带北支和南支之间的转移断层上的 Sürgü 地段,还可能集中在 Çardak 地段的西部和叶西利尔特(马拉蒂亚)附近的 Doğanşehir 地段的东北部。
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Surface rupture during the 6th of February 2023 Mw 7.6 Elbistan-Ekinözü (Kahramanmaraş) earthquake: implications for fault rupture dynamics along the northern branch of East Anatolian Fault Zone
: On the 6th of February 2023, Mw 7.7 Pazarcık (Kahramanmaraş) and Mw 7.6 Ekinözü (Kahramanmaraş) earthquakes that occurred in Türkiye are devastating earthquake series that filled the existing seismic gaps on East Anatolian Fault Zone on the same day. The first Mw 7.7 earthquake caught most people in their sleep and 9 h later, a second one was triggered, ending up with more than 50k death toll, widespread damage to buildings, and massive landslides. This study presents the surface rupture geometry and coseismic displacement characteristics determined with field observations immediately after February 6, 2023, Ekinözü (Kahramanmaraş, Türkiye) earthquake (Mw 7.6). Preliminary implications show that the total rupture length is 130 ± 10 km on the Çardak segment and Doğanşehir segment, known as the northern branch of the East Anatolian Fault Zone. Left lateral strike-slip faulting is developed with a maximum horizontal displacement of 6.60 m and an average displacement of 3.00 m. Furthermore, the pitches of slip lines ranging from 0° to 10° were measured on the neoformed fault planes. In addition to that, surface rupture exhibits restraining bends and releasing bends structure at small scales on the Çardak segment. From this point on, our preliminary results signify that Çardak and Doğanşehir segments were consecutively broken in Mw 7.6 Ekinözü (Kahramanmaraş) earthquake that traced between Göksun and Nurhak region and from there reached the Eskiköy regions. Furthermore, potential stress may be concentrated on not only the Sürgü segment which is on the transfer fault between the northern branch and the southern branch of East Anatolian Fault Zone but also the west of the Çardak segment and the northeast of the Doğanşehir segment near Yeşilyurt (Malatya).
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来源期刊
Turkish Journal of Earth Sciences
Turkish Journal of Earth Sciences 地学-地球科学综合
CiteScore
2.40
自引率
10.00%
发文量
6
审稿时长
6 months
期刊介绍: The Turkish Journal of Earth Sciences is published electronically 6 times a year by the Scientific and Technological Research Council of Turkey (TÜBİTAK). It is an international English-language journal for the publication of significant original recent research in a wide spectrum of topics in the earth sciences, such as geology, structural geology, tectonics, sedimentology, geochemistry, geochronology, paleontology, igneous and metamorphic petrology, mineralogy, biostratigraphy, geophysics, geomorphology, paleoecology and oceanography, and mineral deposits. Contribution is open to researchers of all nationalities.
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