Monitoring Postseismic Deformations in Izmir and Its Surroundings After the 30 October 2020 Mw:6.9 Samos Earthquake

Year 2024, , 1442 - 1455, 02.12.2024

Halil İbrahim Solak , İbrahim Tiryakioğlu , Sefa Yalvaç , Cemal Özer Yiğit , Bahadır Aktuğ , Haluk Özener , Ergin Dönmez , Ertuğrul Demirelli , Eda Esma Eyübagil , Ece Bengünaz Çakanşimşek , Cemil Gezgin , Furkan Şahiner

https://doi.org/10.35414/akufemubid.1465489

Abstract

On October 30, 2020, an earthquake with a magnitude of Mw:6.9 occurred north of Samos Island. This earthquake caused loss of life and property in Izmir city center and some districts. Studies conducted in Izmir and its south showed that there was a horizontal displacement of 4-14 cm in Izmir and its south, the largest of which was in Seferihisar. In this region, however, there are many active faults with the potential to produce earthquakes between Mw:6.1 and Mw:6.9. A 27-site GNSS network has been established to monitor the postseismic deformation in this region since an earthquake can affect the earthquakes that may be caused by nearby faults. In this network, 4 campaign GNSS measurements were carried out in 6-month periods between 2020-2022. Eurasian fixed velocities of all sites were obtained using GNSS data. The results show that the differences between the points in the network both between themselves after the earthquake and between the pre-earthquake velocities reached 6 mm, indicating that the postseismic effect continues in the region.

Keywords

Samos earthquake, GNSS, postseismic deformation, tectonic

30 Ekim 2020 Mw:6.9 Sisam Depremi Sonrası İzmir ve Çevresinde Postsismik Deformasyonların İzlenmesi

Abstract

30 Ekim 2020 tarihinde Sisam adası kuzeyinde Mw:6.9 büyüklüğünde bir deprem meydana gelmiştir. Bu deprem İzmir şehir merkezinde ve bazı ilçelerinde can ve mal kayıplarına yol açmıştır. Deprem sonrası İzmir ve güneyinde yapılan çalışmalar, en büyüğü Seferihisar'da olmak üzere İzmir ve güneyinde 4-14 cm arasında değişen miktarlarda yatay atım meydana geldiğini göstermiştir. İzmir ve güneyinde ise Mw:6.1 ile Mw:6.9 arasında deprem üretme potansiyeline sahip olan diri faylar yer almaktadır. Meydana gelen bir depremin civardaki fayların neden olabileceği depremleri etkileyebilmesi nedeniyle bu bölgede postsismik deformasyonun takip edilmesi amacıyla 27 noktalık bir GNSS ağı kurulmuştur. Bu ağda 2020-2022 arasında 6 aylık periyotlar halinde 4 kampanya GNSS ölçümü gerçekleştirilmiştir. GNSS verileri kullanılarak tüm noktaların Avrasya sabit hızları elde edilmiştir. Elde edilen sonuçlar ağdaki noktaların hem deprem sonrasında kendi aralarındaki hem de deprem öncesi hızlarla aralarındaki farkların 6 mm'ye ulaştığını, buna bağlı olarak bölgede postsismik etkinin devam ettiğini göstermektedir.

Keywords

Sisam depremi, GNSS, postsismik deformasyon, tektonik

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