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OYMAPINAR BARAJI TETİKLENMİŞ DEPREMSELLİĞİ VE DEPREM KARAKTERİSTİKLERİNİN İNCELENMESİ

INDUCUED SEISMICTY OF OYMAPINAR DAM AND INVERSTIGATION OF EARTHQUAKE CHARACTERISTICS

Journal Name:

  • İstanbul Yerbilimleri Dergisi

Publication Year:

  • 2009

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
The earthquakes referred as reservoir-associated earthquakes in dams are induced activities. In our country, there are 617 constructed dams and 68 under-construction dams and hydroelectric power plants, which are administered by The General Directorate of State Hydrolicworks (DSI). Within the scope of this study, the earthquakes of Oymapinar Dam (Antalya) which is a sample of the constructed one, is investigated. Earthquake and water level data of the dam have been obtained from General Directorate of DSI. In this study, the seismic activity before water loading (STO) and after water loading (STS) of Oymapinar Dam are compared. Furthermore, earthquake characteristics which are the b-values of magnitude-frequency distribution, relationships (M0-Mj, Mj/M0) between the magnitudes of the mainshock (M0) and the largest aftershock (Mj), using the Modified Omori Law, p-values that are temporal decay rate of the foreshocks and aftershocks are analyzed. The earthquakes in the Oymapinar Dam area are investigated for three different states in the STS period between the dates 29.05.1984-08.05.1986. In general, the b-values are low for the foreshocks and high for the aftershocks. This result is coherent with the findings of Berg (1968) and Rastogi et al. (1997). However, since overall deduced b- values are lower than the value of 1.0, they are not in coherence with the findings of Gupta and Rastogi (1976). In respect to the inverse proportion between M0-M1 and M1/M0 values is consistent with the proposals of Papazachos et al. (1967), Chaudhury and Srivastava (1973), Rastogi et al. (1995; 1997). The p-values are generally low and seismicity characteristics in the region do not obey the Modified Omori Law.
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Abstract (Original Language): 
Rezervuar kaynaklı olarak adlandırılan baraj depremleri tetiklenmiş deprem türlerindendir. Ülkemizde Devlet Su İşleri (DSİ) tarafından yapımı tamamlanmış olan 617 baraj ve 68 yapım aşamasında olan baraj ve hidroelektrik santral vardır. Çalışma kapsamında, ülkemizde yapımı tamamlanmış barajlardan olan Oymapınar Barajı (Antalya)'nın depremleri incelenmiştir. Baraja ait deprem ve su seviyesi verileri DSİ Genel Müdürlüğü'nden sağlanmıştır. Çalışmada, Oymapınar Barajı'nın su tutma öncesi (STO) ve su tutma sonrası (STS) depremsellikleri karşılaştırılmıştır. Ayrıca; STS dönem içindeki deprem karakteristiklerini ortaya koyan magnitüd-frekans dağılımlarının b değerleri; ana şok magnitüdü (M0) ve en büyük artçı şok magnitüdü (M1) arasındaki ilişki (M0-M1, M1/M0); Değiştirilmiş Omori Yasası kullanılarak öncü şok ve artçı şokların zamansal azalım oranı olan p değerleri incelenmiştir. Oymapınar barajı depremleri STS dönemi içinde 29.05.1984-08.05.1986 tarihleri arasında üç farklı durumda incelenmiştir. Genellikle öncü şoklarda düşük b değerleri, artçı şoklarda ise yüksek b değerleri bulunmuştur. Bu durum, Berg (1968), Rastogi ve diğ. (1997)'nin bulgularıyla uyumludur. Ancak elde edilen tüm b değerleri 1.0'dan küçük bulunduğundan Gupta ve Rastogi (1976)'nın bulgularıyla uyum göstermemektedir. M0-M1 ve M1/M0 değerleri arasında ters orantı olması Papazachos ve diğ. (1967), Chaudhury ve Srivastava (1973), Rastogi ve diğ. (1995; 1997)'nin önerilerini desteklemektedir. Bölgedeki p değerleri ise genellikle düşüktür ve deprem etkinliği karakter olarak Değiştirilmiş Omori Yasasını sağlamamaktadır.
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