SEISMIC HAZARD ASSESSMENT IN THE GEMLIK BAY REGION FOLLOWING THE 17 AUGUST KOCAELI EARTHQUAKE

Seismic Hazard Assessment in the Gemlik Bay Region following the 17 August Kocaeli Earthquake

Bedri Alpar, Sevin Çizmeci

Istanbul University, Institute of Marine Sciences and Management, 34470 Vefa, Istanbul, TURKEY
General Directorate of Mineral Research and Exploration, Ankara, TURKEY

Abstract

Following the Kocaeli Earthquake (17 August 1999), the seismic reflection profiles gathered in the Gemlik Bay in 1984 were reinterpreted in order to identify the characteristics of the sedimentary depositional environments and their relations with the tectonic setting. A discussion followed about the implications for seismic hazard assessment in the Gemlik Bay region.

Keywords: Gemlik Bay, Marmara Sea, earthquake, seismic, deltas

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TSUNAMI GENERATION OF THE KOCAELI EARTHQUAKE (AUGUST 17 1999) IN THE IZMIT BAY; COASTAL OBSERVATIONS, BATHYMETRY AND SEISMIC DATA

Tsunami generation of the Kocaeli Earthquake (August 17th 1999) in the Izmit Bay; coastal observations, bathymetry and seismic data

Yıldız Altınok, Bedri Alpar, Şükrü Ersoy, Ahmet Cevdet Yalçıner

University of Istanbul, Engineering Faculty, Avcılar, 34850, Istanbul, TURKEY
University of Istanbul, Institute of Marine Sciences and Management, Vefa, 34470, Istanbul, TURKEY
Middle East Technical University, Dept. of Civil Engineering, 06531, Ankara, Turkey and University of South California, Department of Civil Engineering 90089-2531 USA

Abstract

In the present study, coastal field observations, detailed bathymetric data and analyses of single-channel, high resolution seismic reflection data are used to characterise tsunami generated during the Kocaeli Earthquake (August, 17th 1999) in the Izmit Bay.

Keywords: Tsunami generation, Izmit Bay, Marmara Sea, seismic

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UNDERWATER SIGNATURES OF THE KOCAELI EARTHQUAKE (AUGUST 17TH 1999)

Underwater signatures of the Kocaeli earthquake (August 17th 1999)

Bedri Alpar

University of Istanbul, Institute of Marine Sciences and Management, Vefa, 34470 Istanbul, TURKEY

Abstract

The fault rupture of the Kocaeli Earthquake ( MW  7.4, at 03:02 on August 17th, 1999) was well defined on land. In the present study, single-channel, high resolution seismic reflection data were used to characterise the underwater fault signatures of the Kocaeli Earthquake in the Izmit Bay and at the eastern Marmara Sea. Some personal opinions are also given about the speculations for a possible (<30 years) and devastating (>magnitude 8) earthquake in the Marmara Sea.

Keywords: Marmara, Izmit Bay, earthquake, seismic exploration

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Vol.5 – 1999 – No.3

Underwater signatures of the Kocaeli Earthquake (August 17th 1999)
Bedri Alpar

Tsunami generation of the Kocaeli Earthquake (August 17 1999) in the Izmit Bay; coastal observations, bathymetry and seismic data
Yıldız Altınok, Bedri Alpar, Şükrü Ersoy, Ahmet Cevdet Yalçıner

Seismic hazard assessment in the Gemlik Bay region following the 17 August Kocaeli Earthquake
Bedri Alpar, Sevin Çizmeci

The bathymetry of the Izmit Bay
A. Cem Güneysu