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タイトル: Low Seismicity, Low Coda-Q and Discontinuities of the Upper Crust in the Vicinity of the Iznik-Mekece Fault, the North Anatolian Fault Zone, Turkey
その他のタイトル: トルコ北アナトリア断層帯,イズニック・メケジェ断層付近における低い地震活動や低いコーダQ値,上部地殻の不連続面について
著者: Tsukuda, Tameshige
Satake, Kenji
Honkura, Yoshimori
Ucer, S. Balamir
Ishikara, A. Mete
著者(別言語): 佃, 為成
佐竹 , 健治
本蔵, 義守
発行日: 1989年3月31日
出版者: 東京大学地震研究所
掲載誌情報: 東京大学地震研究所彙報. 第63冊第4号, 1989.3.31, pp. 327-348
抄録: An attempt to detect microearthquakes was made in the Iznik-Mekece Fault region, a proposed seismic gap in the western part of the North Anatolian Fault Zone, during the period from July 6 to August 13, 1986. We set up six temporary stations installing very small vertical-component seismometers and portable analog event recorders equipped with either paper tapes or magnetic cassette-tapes. A large number of earthquake events, 135 at most for one station, were registered, the majority of which were either distant earthquakes with S-P times over 15 sec or artificial explosions. Eight hypocenters were determined by using data from the three stations, and three more epicenters were estimated from data from two of the stations. All the epicenters are located outside of the central part of the seismic gap region. Only four microearthquakes, which cannot be located, were identified in the vicinity of the Iznik-Mekece Fault. The microseismic activity rate around our network is statistically estimated to be 23.0 events/year with a significance level of 10%. Coda Q values are found to be very low, between 30 and 200, in the fault region at frequencies from 2 to 10 Hz compared with the values, between 70 and 300, of the surrounding region. Two possible explanations are proposed for this: scattering due to concentrated heterogeneous medium and temporal increase of intrinsic absorption related to preparation of a large earthquake.
URI: http://hdl.handle.net/2261/13023
ISSN: 00408972


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