Spatial and temporal distribution of b and p values of 12 November 1999 Düzce earthquake estimated from its aftershocks and assessments for future earthquake hazard

Yıl 2005, Cilt: 26 Sayı: 1, 75 - 91, 01.02.2005

Murat Utkucu Canan Çetin Ömer Alptekin

Öz

Anahtar Kelimeler

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12 Kasım 1999 Düzce depremi artçı depremlerinden hesaplanan b ve p değerlerinin uzaysal ve zamansal dağılımı ve gelecekteki sismik tehlike açısından değerlendirmeler

Öz

Gerek laboratuvar, gerekse gerçek deprem verilerini esas alan çalıflmalardan deprem istatistiğinin frekans-büyüklük bağıntısındaki b değerinin yerkabuğundaki gerilim ile ters orantılı olduğu anlaflılmıfltır. Bu çalıflmada; 12 Kasım 1999 Düzce depreminin artçı deprem verilerinden bu depremin kırılma düzlemi ve bitifliğindeki Karadere veElmalık fay segmentleri boyunca yüzeyde ve derinlik boyutunda b değerleri ve artçı deprem azalım sabiti p’ninuzaysal dağılımı bir bilgisayar paket programı kullanılarak hesaplanmıfltır. Düzce depremi için, Düzce fay segmenti üzerindeki pürüz boyunca haritalanan b=1.2-1.5 ve p=1-1.3 değerleri daha yüksek iken, Karadere (b=0.8-1.0,p=0.7-0.8) ve Elmalık (b=1.1-1.2, p=1.1) fay segmentleri boyunca daha düflük b değerleri elde edilmifltir. Ayrıca,b değerlerinin özellikle Düzce fayı üzerinde 1999 Düzce depremi öncesine göre yükseldiği görülmüfltür. Bu durum,Karadere ve Elmalık fay segmentleri boyunca Düzce depremi sonrasında gerilme artıflları (Düzce fayı üzerinde isegerilme azalımı) olduğunu düflündürmektedir. Karadere fay segmentinin 17 Ağustos 1999 Kocaeli depremi sırasında kırılmıfl olması ve Elmalık fay segmenti üzerinde geçen yüzyıl içinde kaydadeğer bir deprem olduğuna iliflkin veri olmaması, 1999 Düzce depremi sonrasında bu fay üzerinde deprem tehlikesinin arttığı fleklinde yorumlanmıfltır

Anahtar Kelimeler

b değeri, deprem tehlikesi, Düzce depremi, Kuzey Anadolu Fay Zonu, p değeri, pürüz

Kaynakça

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