The North Anatolian Fault on the Hersek Peninsula, Turkey: Its Geometry and Implications for the 1999 İzmit Earthquake Rupture Propagation

ÖZGÜR KOZACI; ERHAN ALTUNEL; SCOTT LINDVALL

Article Details

The North Anatolian Fault on the Hersek Peninsula, Turkey: Its Geometry and Implications for the 1999 İzmit Earthquake Rupture Propagation

Authors:

ÖZGÜR KOZACI | ERHAN ALTUNEL | SCOTT LINDVALL

Publisher:

TUBITAK

Journal:

Turkish Journal of Earth Sciences 2011 Vol.20 Issue 4, pp.359-378

Document Type:

Article

Publication Date:

3/2011

Document Language:

Turkish

Document ID (Org No.):

2000732065

Frequency:

Bimonthly

eISSN:

1303-619X

pISSN:

1300-0985

Abstract:

 

The western termination of the 1999 İzmit earthquake still remains as an intriguing problem for researchers and the people residing around the Sea of Marmara. There have been numerous offshore mapping and modelling studies performed in the Gulf of İzmit. However, the main debate about the western termination of the 1999 İzmit surface rupture is linked to the Hersek Peninsula and corresponding fault geometry. We focused our efforts at resolving the fault geometry on the Hersek Peninsula by applying geological mapping, geomorphic analyses, palaeoseismic trenching and geophysical surveys. Our studies reveal that the North Anatolian Fault forms a restraining stepover and did not experience surface rupture during 1999 İzmit earthquake in the vicinity of Hersek Peninsula. We tested this fault geometry with a finite element model in half elastic space and correlated the results successfully with the existing topography. In addition, we ran a simple Coulomb model to explain the possible cause of surface rupture termination at this specific location. Our studies, combined with detailed off shore bathymetry data, suggest that the restraining step of the North Anatolian Fault on the Hersek Peninsula is capable of creating an efficient earthquake rupture barrier.

 

The western termination of the 1999 İzmit earthquake still remains as an intriguing problem for researchers and the people residing around the Sea of Marmara. There have been numerous offshore mapping and modelling studies performed in the Gulf of İzmit. However, the main debate about the western termination of the 1999 İzmit surface rupture is linked to the Hersek Peninsula and corresponding fault geometry. We focused our efforts at resolving the fault geometry on the Hersek Peninsula by applying geological mapping, geomorphic analyses, palaeoseismic trenching and geophysical surveys. Our studies reveal that the North Anatolian Fault forms a restraining stepover and did not experience surface rupture during 1999 İzmit earthquake in the vicinity of Hersek Peninsula. We tested this fault geometry with a finite element model in half elastic space and correlated the results successfully with the existing topography. In addition, we ran a simple Coulomb model to explain the possible cause of surface rupture termination at this specific location. Our studies, combined with detailed off shore bathymetry data, suggest that the restraining step of the North Anatolian Fault on the Hersek Peninsula is capable of creating an efficient earthquake rupture barrier.

Article Details

The North Anatolian Fault on the Hersek Peninsula, Turkey: Its Geometry and Implications for the 1999 İzmit Earthquake Rupture Propagation

Authors: ÖZGÜR KOZACI | ERHAN ALTUNEL | SCOTT LINDVALL

Publisher: TUBITAK

Journal: Turkish Journal of Earth Sciences 2011 Vol.20 Issue 4, pp.359-378

Document Type: Article

Publication Date: 3/2011

Document Language: Turkish

Document ID (Org No.): 2000732065

Frequency: Bimonthly

eISSN: 1303-619X

pISSN: 1300-0985

Issues

Authors:

ÖZGÜR KOZACI | ERHAN ALTUNEL | SCOTT LINDVALL

Publisher:

TUBITAK

Journal:

Turkish Journal of Earth Sciences 2011 Vol.20 Issue 4, pp.359-378

Document Type:

Article

Publication Date:

3/2011

Document Language:

Turkish

Document ID (Org No.):

2000732065

Frequency:

Bimonthly

eISSN:

1303-619X

pISSN:

1300-0985