@article{oai:niigata-u.repo.nii.ac.jp:00028015, author = {守随, 治雄 and 丸井, 英明}, journal = {新潟大学積雪地域災害研究センター研究年報, 新潟大学積雪地域災害研究センター研究年報}, month = {Mar}, note = {This article deals with results of field investigations about the damages caused by Kocaeli Earthquake with an emphasis of ground failures. The field investigations were carried out from 25 September to 1 October, 1999. At first, the geology, tectonics and seismotectonics of the target area are briefly outlined. Then evaluation of the findings from the field investigations is presented and discussed. A big earthquake, registering magnitude 7.4 on the Richter scale, struck the northwestern area of Turkey at 03:02 on August 18, 1999. According to preliminary reports, the earthquake caused loss of more than15,000 lives and injury of more than 24,000 people. The epicenter was18km beneath and near to the town of Bahcecik which locates at the eastern end of Izmit gulf. The highest value of horizontal acceleration was measured to be 0.42G at Sakarya. The earthquake caused severe damages in Bahcecik, Derince, Golcuk, Sakarya (Adapazari) and Yalova. The most heavily damaged areas concentrated along the North Anatolian Fault. The North Anatolian Fault is one of the most active fault in the world, along which big earthquakes have occurred repeatedly and quite frequently. The findings are summarized as follows: 1) Severe damages are observed just on the surface fault lines which were newly transformed by the Kocaeli Earthquake in the vicinity of the epicenter (inside of 20km distance). 2) Damages are apparently decreased in the areas a certain distance away from the surface fault lines. 3) Severe damages are observed in the area of alluvium and/or artificial embankment in spite of the distance from the surface fault lines and/or from the epicenter. 4) Possibility of the occurrence of big submarine landslide is to be referred in the vicinity of the epicenter especially in the area of delta and/or alluvial fan where groundwater level locates at high position. 5) The degree of damages is dependent not only on the distance from the epicenter and from the surface fault lines but also densely on the ground conditions (alluvium or artificial embankment).}, pages = {57--72}, title = {1999年8月トルコ・コジャエリ地震による被害調査 : 特に,地質(地盤)条件と被害状況との関係について}, volume = {21}, year = {2000} }