Landslides and lateral spreading triggered by the 24 January 2020 Sivrice earthquake (East Anatolian Fault)

Yıl 2021, Cilt: 11 Sayı: 3, 751 - 760, 15.07.2021

Mehmet Köküm

https://doi.org/10.17714/gumusfenbil.877544

Cited By: 2

Öz

On 24 January 2020, a devastating earthquake struck the town of Sivrice in Elazığ province at 20:55 local time (17:55 UTC), resulting in 41 death and significant loss of property. The magnitude of the earthquake was determined to be Mw 6.8 and strong shaking of main shock lasted about 20 seconds. The Sivrice earthquake triggered about 30 landslides over an area of ~55 km2. This article presents the preliminary results of comprehensive study on mapping of the distribution of landslides, lateral spreading and other ground damaged effects triggered by the Sivrice earthquake occurred on the East Anatolian Fault. Following Sivrice earthquake, based on detailed on-ground field studies: (1) The Sivrice earthquake produced fewer landslides than empirical prediction for shallow earthquakes of these magnitudes (Mw 6.8) would suggest; (2) the Sivrice earthquake triggered extensive lateral spreading in Holocene age river banks, and result in the ground tears, opening surface cracks and fissure on flat ground; (3) primary surface rupture was not produced by Sivrice earthquake.

Anahtar Kelimeler

Earthquake, East Anatolian Fault, Landslide, Lateral spreading

24 Ocak 2020 Sivrice depreminin (Doğu Anadolu Fayı) tetiklediği heyelan ve yanal yayılmalar

Öz

24 Ocak 2020 tarihinde yerel saat ile 20:55’ te (17:55 UTC) Elazığ ili Sivrice ilçesinde büyük bir deprem meydana gelmiş ve neticesinde 41 kişi hayatını kaybederken önemli maddi kayıplara yol açmıştır. Depremin aletsel büyüklüğü 6,8 olup, kaynak alanda 20 sn. sürmüştür. Sivrice depremi ~55 km2 bir alanda 30 civarında heyelan tetiklemiştir. Bu makale, Doğu Anadolu Fayı'nda meydana gelen Sivrice depreminin tetiklediği heyelanların dağılımını, yanal yayılmayı ve diğer yüzey deformasyonlarının haritalandırılmasına ilişkin kapsamlı bir arazi çalışmasının sonuçlarını sunmaktadır. Sivrice depreminin ardından gerçekleştirilen ayrıntılı saha çalışmalarına dayanarak: (1) Sivrice depremi, bu büyüklüklerdeki sığ depremler için (Mw 6.8) ampirik bağıntılarla hesaplanan tahminlere göre daha az heyelan üretti; (2) Sivrice depremi Holosen yaşlı nehir kıyılarında geniş yanal yayılmaları tetikledi ve zemin yırtılmalarına, yüzey çatlaklarına ve büyük yarıklara neden oldu; (3) birincil yüzey kırılması (yer değiştirme) Sivrice depremi tarafından üretilmedi.

Anahtar Kelimeler

Deprem, Doğu Anadolu Fayı, Heyelan, Yanal yayılma

Kaynakça

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