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17 AĞUSTOS 1999 İZMİT DEPREMİ KIRILMA ZONU BOYUNCA ARTÇI DEPREMLE0RİN ETKİNLİK PARAMETRELERİNİN (b ve p DEĞERLERİ) UZAYSAL DAĞILIMININ İNCELENMESİ

A STUDY OF SPATIAL DISTRIBUTION OF AFTERSHOCK SEISMICITY PARAMETERS (b and p values) ALONG THE FAULT RUPTURE ZONE OF 17 AUGUST İZMİT EARTHQUAKE

Journal Name:

  • İstanbul Yerbilimleri Dergisi

Publication Year:

  • 2005

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
It was well established both in laboratory studies and case studies that constant b of frequency-magnitude relationship of earthquake statistics is inversely related to the stress in the earth's crust. As the state of stress along a fault or fault zone is variable, it is conceivable to think that the stress also variable and the locked section or sections along a fault, namely asperities, accumulate relatively higher stress than the surrounding fault areas. When an asperity fails or a mainshock takes, place the situation is reversed and asperities have lower stress than the surrounding fault area. Therefore, it was postulated that b values estimated from the aftershock seismicity should be higher over the asperities and should be lower over the surrounding fault areas. In this study, aftershock seismicity of the August 17, 1999 İzmit earthquake is used to map the spatial distribution of b and aftershock decay parameter p values both over earth surface and in depth domain along the rupture zones of the mainshock using a software package named ZMAP 6.0. For the 1999 İzmit mainshock it is determined that fault section with major moment release between Gölcük and east of the Sapanca lake still retained lower b values ( 0.85-1) and higher p values (1-1.3) while higher b values observed in west of Hersek Delta (b about 1.4-1.75, p about 0.7-1.0) and along the Karadere fault segment (KFS) of the surface rupture. There is almost no change from the published seismicity parameters determined from premainshock seismicity. As it was hypothesized and discussed in previous studies that the rupture properties may not be the only reason behind the change in the seismicity parameters after the mainshocks and the other geological and geophysical parameters in crust may also play a role.
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Abstract (Original Language): 
Gerek laboratuar çalışmalarından ve gerekse durum çalışmalarından deprem istatistiğinin frekans-magnitüd bağıntısındaki b değerinin yerkabuğundaki gerilim ile ters orantılı olduğu sağlam bir temele oturtulmuştur. Bir fay zonu üzerinde gerilme değişken olduğundan b değerinin de değişken olduğu düşünülebilir çünkü, bir fay zonu üzerinde kilitli kısımlar olarak bilinen ve pürüz olarak adlandırılan kısımlar onları çevreleyen fay alanlarına nazaran daha fazla gerilme biriktirirler. Bundan dolayı, artçı deprem etkinliğinden tahmin edilen b değerlerinin pürüzler üzerinde daha yüksek ve çevreleyen fay bölgeleri üzerinde daha düşük olması gerektiği ileri sürülmüştür.Bu çalışmada 17 Ağustos 1999 İzmit artçı deprem verilerinden bu depremin ana şok kırık zonu boyunca yüzeyde ve derinlik boyutunda b değerleri ve artçı şok azalım parametresi p'nin uzaysal dağılımı ZMAP6.0 bilgisayar paket programı kullanılarak hesaplanmıştır. 1999 İzmit depremi ana şoku için, Gölcük ve Sapanca gölünün doğusu arasındaki esas enerji boşalımının olduğu fay kısmında düşük b değerleri (0.85-1) ve yüksekp değerleri (1-1.1) gözlenirken daha yüksek b ve p değerleri Hersek deltasının batısında (b=1.4-1.75, p=0.7-1.0) ve yüzey kırığının Karadere fay segmenti boyunca hesaplanmıştır. İzmit depremi öncesi depremsellik verilerinden diğer araştırmacılarca hesaplanan b değerleri ile bu çalışmada art sarsıntı verisinden hesaplanmış değerlerde neredeyse hiçbir değişiklik görülmemiştir. Bundan dolayı daha önceki araştırıcıların önerdiği ve tartıştığı gibi artçı deprem etkinliğinden hesaplanan b ve p parametrelerindeki değişimde sadece kırılma özelliklerinin değil kabuk içindeki diğer bazı jeolojik ve jeofizik parametrelerin de etkisi olabilir.
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  • 2
123-138
  • Turkish

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