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Isoseismal map, human casualty and building damage statistics of the Izmit Earthquake of August 17, 1999

Bülent Özmen

3rd Japan-Turkey Workshop on Earthquake Engineering

2000/02

A large earthquake occurred in Marmara region of Turkey on August 17, 1999 at 3.02 a.m. on local time. Earthquake parameters were determined by the National Earthquake Network operated by the Earthquake Research Department (ERD) of the General Directorate of Disaster Affairs as magnitude Mw:7.4, epicenter 40.70N latitude, 29.91E longitude and 15.9 kilometers depth. Main schock was about 12 kilometers southeast of the center of Izmit in Kocaeli province.

The main aim of this paper is to find out relation of heavy damage and human casualty and compare the estimation and observed isoseismal maps.

According to Crisis Center of Prime Ministry and General Directorate of Disaster Affairs the earthquake caused the loss of 17127 lives and 43953 injured people and 66441 collapsed and heavily damage, 67242 moderate damage, 80160 slightly damage. Forty-eight percent of total heavy damage has occurred in Kocaeli province, 29 percent in Sakarya province, 14 percent in Yalova province, 5 percent in Bolu province, 5 percent in Istanbul province, 0.04 percent in Bursa province and 0.12 in Eskisehir province. It is the second largest earthquake in Turkey since 1939 Erzincan earthquake (Ms=7.8, 32962 killed) in point of the amount of human loss. This earthquake mainly affected seven provinces.

Isoseismal map has been drawn on the map based on the field observations, preliminary damage evaluation prepared by General Directorate of Disaster Affairs, Ministry of Public Works and Settlement and acceleration records. Seismic intensity was determined X at Gölcük, Çiftlikköy, Adapazarı and Gölyaka districts.

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