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Microearthquake Activity before the zmit Earthquake in the Eastern Marmara Region, Turkey (1 January 1993-17 August 1999)

erif Bari, Akihiko Ito, S. Balamir Üçer, Yoshimori Honkura, Nafiz Kafadar, Riza Pekta, Tolga Komut and Ahmet Mete Iikara

Kandilli Observatory and Earthquake Research Institute
Bogaziçi University
Cengelköy
Istanbul 81220
Turkey
ucerb{at}boun.edu.tr, baris{at}boun.edu.tr
(.B., B.Ü., N.K., R.P., T.K., A.M.I.)
Faculty of Education
Utsonumiya University
Utsunomiya 321-8505
Japan
(A.I.)
Department of Earth and Planetary Sciences
Tokyo Institute of Technology
Tokyo 152-8551
Japan
(Y.H.)

Manuscript received 30 August 2000.

A telemetered seismic network (IZINET) consisting of 13 stations has been in operation since 1993 in the western extension of the North Anatolian Fault Zone (NAFZ) in the eastern Marmara region. The network was established to study microearthquake activity in this region, which had been known as a seismic gap until the occurrence of the 17 August 1999 zmit (Kocaeli) earthquake (M_w 7.4). For the last 7 yr, about 3250 events were recorded and located. Local magnitudes of these events, which were determined based on the duration of seismic coda waves, were generally smaller than 4.0. Seismicity in the time period studied clusters in five areas. Most of the events are found to be shallower than 20 km. It turned out that before the 17 August 1999 zmit earthquake, the zmit-Adapazari region was seismically more active than the other regions in the western extension of the NAFZ.

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