Preliminary Report on the 17 August 1999 Kocaeli Earthquake, Turkey :

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Abstract

In the early morning of 17 August 1999,a devastating earthquake with Magnitude 7.4 on the Richter scale occurred beneath Izmit City, Kocaeli Province, Turkey. The destruction to Turkish nation was severe both in casualties and economic damage. Seven large earthquakes occurred along the North Anatolian Fault in the 20th century since 1939,the epicenters migrating westward. The earthquake of 1967 took place 70km east of the Kocaeli earthquake site. Taking the westward migration of the epicenters into consideration, people involved in earthquakes disaster management in Turkey had anticipated this earthquake to occur at a site closer to Istanbul soon after the event of 1967. The Monbusho, the Japanese Ministry of Education, Science, Culture and Sports, dispatched a survey team to investigate the Kocaeli disaster and to learn lessons from the disaster. Activities of this team were (1) observation of the fault system which this earthquake formed; (2) estimation of how strongly ground close to the fault was shaken during the event; (3) investigation of structural damage and its relation to earthquake motion; (4) estimation of ground motion at sites at which no instrument recording was made; and (5) investigation of the management of the disaster and the societal response to it.

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