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Investigation of one-dimensional crustal seismic velocity structure of Ankara and surroundings

Year 2012, Volume: 33 Issue: 2, 141 - 168, 01.03.2012

Abstract

References

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Ankara ve dolayında kabuğun bir-boyutlu sismik hız yapısının araştırılması

Year 2012, Volume: 33 Issue: 2, 141 - 168, 01.03.2012

Abstract

Bu çalışmada, yerel deprem verileri kullanılarak Ankara ve civarı altındaki üst kabuğa ait yeni bir bir-boyutlu (1-B) sismik dalga hızı modeli üretilmiştir. Deprem verisi, bölgenin güncel depremselliğinin gözlenmesi amacıyla kurulmuş olan geçici bir yerel sismik istasyon ağının kayıtlarından alınmıştır. 6 adet geniş-bantlı sismograftan oluşan Ankara Deprem İzleme Ağı (AnkNET) ile 2007 - 2010 yılları arasında veri toplanmıştır. AnkNET istasyonlarınca kaydedilen veriler kullanılarak bölgenin deprem aktivitesi izlenmiş, deprem konum parametreleri belirlenmiş ve kabuktaki sismik dalga hız yapısı araştırılmıştır. Söz konusu verinin büyük kısmını Bala’daki yerel aktif faylardan kaynaklanan depremler oluşturmaktadır. 1-B sismik hız modelinin belirlenebilmesi için AnkNET istasyonlarının homojen dağılımı uygun olsa da sayıca yetersiz olduğundan farklı istasyon kayıtlarının da kullanılması gerekli görülmüş ve bu amaçla Boğaziçi Üniversitesi Kandilli Rasathanesi ve Deprem Araştırma Enstitüsü (KRDAE)’nün bölgeye yakın istasyon verileri de kullanılmıştır. 1-B hız modeli kestiriminde toplam 2955 P ve S-fazı kullanılmıştır. Çalışmada kullanılan deprem odakları ilk 30 km derinlik içerisindedir, bu durum, sismik hız yapısının çözüm derinliğini sınırlamaktadır. Sonuçta 30 km derinliğe kadar hız yapısı belirlenen yeni 1-B P- ve S-dalga hızı modelinde, üstteki 8 km kalınlığındaki katmanın P-dalga hızı 5.25 km/s iken alttaki katmanların P-dalga hızları derinlikle artmakta ve 30 km derinlikte 6.47 km/s ’ye ulaşmaktadır

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Details

Primary Language Turkish
Journal Section Articles
Authors

Begüm Çıvgın

Bülent Kaypak This is me

Publication Date March 1, 2012
Submission Date March 24, 2015
Published in Issue Year 2012 Volume: 33 Issue: 2

Cite

EndNote Çıvgın B, Kaypak B (March 1, 2012) Ankara ve dolayında kabuğun bir-boyutlu sismik hız yapısının araştırılması. Yerbilimleri 33 2 141–168.