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The Seismicity in the Eastern Marmara Sea after the 17 August 1999 zmit Earthquake

Bogaziçi University
Kandilli Observatory and Earthquake Research Institute
81220 Çengelköy
Istanbul
Turkey
(H.K., M.A.)
Institut de Physique du Globe
4 Place Jussieu
75252 Paris
France
(M.-P.B.)
Université Joseph Fourier
BP 53
38041 Grenoble
France
(M.B., M.D., C.C.)

Manuscript received 30 August 2000.

We used seismic stations that we deployed after the zmit earthquake along the shores and islands of the zmit Bay-Çinarcik basin to study the seismic activity that took place after the earthquake in the eastern Marmara Sea. The aftershock distribution indicates the existence of three clusters of activity there in the days that followed the earthquake. One of the clusters shows the extension of the E-W-trending zmit rupture into the eastern Marmara Sea. The seismic activity there clearly outlines the fault plane of the main rupture and shows its termination 35 km beyond the Hersek peninsula. Two other clusters of activity are present in the region. One is in the Armutlu peninsula and the other one is located a few kilometers southwest of the Tuzla peninsula beneath the northern slope of the Çinarcik basin. The focal mechanism solutions indicate strike-slip faulting along the main branch of the zmit rupture and normal faulting within the two swarms. The presence of the different mechanisms suggests the existence of slip partitioning in the region. A remarkable feature of the aftershock data is the absence of seismicity above 4 km in the Marmara Sea.

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