An Evaluation on the Behaviors of Aftershock Sequence of November 26th, 2019 Earthquake, ML=6.3, North of Durrës, Albania

Year 2021, Volume: 9 Issue: 1, 817 - 826, 15.06.2021

Serkan Öztürk , Rrapo Ormenı

https://doi.org/10.18586/msufbd.899411

Cited By: 1

Abstract

A comprehensive assessment of aftershocks occurrence for the November 26th, 2019 earthquake, ML=6.3, 16 km north of Durrës, Albania was achieved. b-value was estimated as 0.88 ±0.07. b-value is close to 1.0 and relatively small b-value may be resulted from the plenty of larger aftershocks with ML4.0. p-value was calculated as 1.23±0.08 with Mmin=3.1 and Tstart=0.0034 days. This high p-value may be a result of the relative fast decay rate of aftershock activity. Dc-value was calculated as 1.74±0.09 and it means that aftershocks are homogeneously distributed at larger scales. The smallest b-values and the largest p-values were observed in the north, northwest and northeast parts of the mainshock. The smaller b-values correlate with the larger stress variations, whereas the larger p-values are related to the maximum slip after mainshock. Consequently, region-time-magnitude analyses of the aftershocks occurrence may supply important clues for the fast evaluations of real time aftershock hazard.

Keywords

Albania, Durrës earthquake, aftershock, b-value, p-value, Dc-value

Thanks

The authors would like to thank to reviewers for their useful and constructive suggestions in improving this paper. The new release of ZMAP software is freely available (version 7, https://github.com/zmap/zmap). We are grateful to Albanian Seismological Stations, Montenegro Seismological Stations and from INGV, MEDNET, and AUTH networks for providing us aftershock catalog.

26 Kasım 2019, ML=6.3, Kuzey Durrës, Arnavutluk Depreminin Artçı Şok Dizisinin Davranışları Üzerine Bir Değerlendirme

Abstract

26 Kasım 2019, ML=6.3, kuzey Durrës, Arnavutluk depreminin artçı şok oluşumunun detaylı bir değerlendirmesi yapılmıştır. b-değeri 0.88 ±0.07 olarak hesaplanmıştır. b-değeri 1.0’e yakındır ve nispeten küçük b-değeri ML4.0 olan büyük artçı şokların fazla oluşundan kaynaklanmış olabilir. p-değeri, Mmin=3.1 ve Tstart=0.0034 gün alınarak 1.23±0.08 olarak hesaplanmıştır. Bu yüksek p-değeri artçı şok aktivitesinin nispeten hızlı azalım oranının bir sonucu olabilir. Dc-değeri 1.74±0.09 olarak hesaplanmıştır ve buda artçı şokların daha büyük ölçeklerde homojen olarak dağıldığı anlamına gelir. En küçük b-değerleri ve en büyük p-değerleri ana şokun kuzey, kuzeybatı ve kuzey kısımlarında gözlenmiştir. Daha düşük b-değerleri daha büyük gerilme değişişimler ile ilişkiliyken, daha büyük p-değerleri ana şoktan sonraki maksimum atım ile ilişkilidir. Sonuç olarak, artçı şok oluşumlarının bölge-zaman-magnitüd analizleri gerçek zamanlı artçı şok tehlikesinin hızlı değerlendirmeleri için önemli ipuçları sağlayabilir.

Keywords

Arnavutluk, Durrës depremi, artçı şok, b-değeri, p-değeri, Dc-değeri

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