3 Aralık 2020 Siirt-Kurtalan Depremi (Mw5.1) Kaynak Parametreleri ve Fay Çözümlerinin Araştırılması, Güneydoğu Anadolu

Yıl 2021, Cilt: 21 Sayı: 5, 1210 - 1222, 31.10.2021

Nihan Hoskan

https://doi.org/10.35414/akufemubid.931365

Öz

3 Aralık 2020 tarihinde Bitlis-Zagros Bindirme Kuşağı yakınında uzun zamandır sismolojik olarak suskun olan bölgede, Siirt-Kurtalan Depremi meydana gelmiştir. Bu çalışmada, Siirt-Kurtalan depreminin (Mw5.1) odak mekanizma çözümleri P-dalgası polaritelerinden hesaplanıp, diğer deprem veri merkezleri tarafından yapılan çözümlerle karşılaştırmalı olarak irdelenmiş ve depremin spektral kaynak özellikleri ortaya konmuştur. Bunların yerel tektonik yorumlamaya katkısı sunulmuştur. Buna göre depremin dış merkezi 38.048oK enlemi, 41.746oD boylamı olarak bulunmuştur. S dalga yer değiştirme spektrumu üzerinde köşe frekansı 0.571 (±0.098) Hz olarak hesaplanmıştır. Buna bağlı olarak, kaynak yarıçapı=1.973 (±0.088) km, momenti (Mo)=5.015*1016 (±0.062) Nm, moment büyüklüğü(Mw)=5.098 (±0.093), gerilim boşalımı=27.487 (±0.304) bar olarak bulunmuştur. HASH yazılımı kullanılarak birinci ve ikinci düğüm düzlemleri için (doğrultu, eğim ve kayma) sırasıyla (326, 84, 178) ve (56, 88, 6) olarak bulunmuştur. Buna göre ikinci düğüm düzlemi yerel tektoniğe uygun sol yönlü doğrultu atımlı fay karakteristiğini göstermektedir. Sismotektonik etkinlik bakımından önemli olan Bitlis-Zagros Kenet Kuşağı sürekli gözlemlenmelidir. Bunun için ek deprem istasyonları kurulmalı ve bölgede detaylı sismotektonik çalışmaların yapılması sağlanmalıdır.

Anahtar Kelimeler

3 Aralık Siirt-Kurtalan Depremi, Deprem Kaynak Parametreleri, FPFIT Yazılımı, Gerilim Boşalması, HASH Yazılımı, Yayınım Paterni

Investigation of the Source Parameters and Fault Mechanism Solutions of the December 3rd, 2020 Mw5.1 Siirt-Kurtalan Earthquake, Southeast Anatolia

Öz

On December 3rd, 2020, the Siirt-Kurtalan Earthquake occurred near the Bitlis-Zagros Suture Zone that has been seismologically quiet for a long time. In this study, the focal mechanism solutions of the Siirt-Kurtalan earthquake (Mw5.1) were determined from P-wave polarities, analyzed in comparison with the solutions provided by other earthquake data centers, and the spectral source characteristics of the earthquake were revealed. Accordingly, the epicenter of the earthquake was found 38.048oN, 41.746oE. On the S-wave displacement spectrum, corner frequency was calculated 0.571 (±0.098) Hz. Consequently, source radius=1.973 (±0.088) km, the moment (Mo)=5.015*1016 (±0.062) Nm, the moment magnitude (Mw)=5.098 (±0.093), and the stress drop=27.487 (±0.304) bar were found. Using the HASH code, for the first and second nodal planes (strike, dip, rake) were found as (326, 84, 178) and (56, 88, 6), respectively. Therefore, the second nodal plane shows a left-lateral strike-slip fault characteristic in accordance with local tectonics. The Bitlis-Zagros Suture Zone, which is important in terms of seismotectonic activity, should be constantly observed. For this purpose, additional earthquake stations should be established and detailed seismotectonic studies should be carried out in the region.

Anahtar Kelimeler

December 3rd, 2020 Siirt-Kurtalan Earthquake, Earthquake Source Parameters, FPFIT Code, Stress Drop, HASH Code, Radiation Pattern

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• İnternet kaynakları 1-https://tdvms.afad.gov.tr (15.12.2020) 2-https://deprem.afad.gov.tr/sondepremler (15.12.2020) 3. http://seisan.info/ (15.12.2020)