Rupture process and spectra of some major Turkish earthquakes and their seismotectonic implications
Başlık çevirisi mevcut değil.
- Tez No: 364510
- Danışmanlar: PROF. DR. CEMİL GÜRBÜZ
- Tez Türü: Doktora
- Konular: Deprem Mühendisliği, Earthquake Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 1995
- Dil: İngilizce
- Üniversite: Boğaziçi Üniversitesi
- Enstitü: Kandilli Rasathanesi ve Deprem Araştırma Enstitüsü
- Ana Bilim Dalı: Deprem Mühendisliği Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 140
Özet
Özet yok.
Özet (Çeviri)
The teleseismic body waveform inversion of 18 large earthquakes in Turkey were examined in order to understand rupture processes of these earthquakes. The total seismic moments thus obtained were compared with the moments estimated from their spectra. The earthquakes were choosen from different tectonic regimes; 3 from the Northeast Anatolian block that undergoes a continental collision between Arabia (LIlel Eurasia, 1 from the East Anatolian Fault Zone (EAFZ) that accomodates the motion between the Turkish and Arabian plates, 1 from the Northeast Anatolian Fault (NEAF) which is the northern border of the Northeast Anatolian block, 1 from the Bitlis Zagros Thrust and Fold Belt which is the southern border of the Northeast Allatolian block, 3 from the North Anatolian Fault Zone that accomodates the motion betweell Turkey and Eurasia, 4 from the Western Turkey which is subject to N-S extellsioll, 3 from the Aegean Sea, 1 from the Black Sea region, and 1 from the Cyprus region tha,t represents the motion between Africa and Turkey. The teleseismic records were obtained from WWSSN, GDSN and IRIS data centers and the method of complex body wave inversion developed by Kikuchi alld Kanamori (1991) was used. The results indicate that most of the earthquakes haviug magnitudes of Als :2: 6.8 show complex rupture patterns as revealed by the space aml time distributions of the subevents which provide information on the details of rupture process. The total seismic moment tensor comprised from the moment tensors of the individual subevents represents well both the overall tectonic stress regime in the source region and the observed surface ruptures. The estimated moment magnitude for each event was found to be directly related to the surface magnitude in the magnitude range of .5.5 - 7.:3 range. The conclusions of this study are as follows: (1) The northward motion of the Arabian plate with slip rate of 24.4 mm/yr is accomodated along the EAF and the Bitlis Zagros Thrust and Fold Belt with slip rate of 5-6 mm/yr, as inferred from the 1971 Bing()l and 1975 Lice earthquakes. (2) Although the focal mechanisms of the maill subevents of the 1975 Lice and 198:l Horasan-Narman earthquakes have nearly equal len-lateral strike-slip aud thrust faulting components as also reported by the other investigators. The total seismic moment tensor of this event shows a predominant thrust faulting with E-W strike which is more compatible with the observ(~d ruptures as well as the stress regime in the region. (:3) Not all, but most of til(-' multiple eveuts have a non-double-couple component, resulting from subevents with different fault orientations. (4) The seismic moments determined in frequency domain are drastically dependent on the radiation pattern correction. This fact could be used as a llsf'ful tool ill v('ryii Ilg the source IlWcil
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