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Summary of Proposal GEO1273

TitleData provision for GEO's Istanbul Geohazard Supersite
Investigator CAKIR, Ziyadin - Istanbul Technical University, Geology
Team Member
Dr Ergintav, Semih - TUBITAK, Marine Geology and Geophysics
Dr Amelung, Falk - Miami University, Marine Geology and Geophysics
Dr Walter, Thomas - GeoForschungsZentrum, Physics of the Earth
Crosby, Christopher - UNAVCO, N/A
SummaryThe Geohazards Supersite conceptaims to facilitate access to space and in-situdata for regional areas exposed to geological threats. The principal objective is to encourage basic research of earthquake, volcano andother hazardous geological processes as a means of reducing the lossof life from geological disasters.After the 1999 disastrous Izmit earthquake (Mw=7.4) another large and destructive earthquake is now expected to occur further west along the North Anatolian fault under the Sea of Marmara 20 km south of Istanbul, one of the most populous and rapidly growing cities of Europe. Historical documents going back to two millennia indicate that many destructive earthquakes stroke the city of Istanbul since the northern segment of the NAF under the Marmara Sea accommodates most of the plate motion between Anatolia and Eurasia. The probability of a large earthquake to strike Istanbul again is estimated to be about 65% over the next 20 years. We therefore aim to monitor the NAF in order to better understand its behavior and characteristics by collaborating with scientists from various disciplines around the world using Terra-SAR data together with other SAR, geodetic and seismological data set provided to the Geohazard Supersites, share the findings with the relevant state agencies (e.g. Istanbul Metropolitan Municipality and State Department of Disaster) and with the scientific community of Supersites. The threat posed by the NAF to Istanbul and surrounding regions will be better evaluated by using the multiple data sets in Super Sites with various approaches and techniques in a collaborative way. The metropolitan area of Istanbul and the eastern Marmara region that covers the western termination of the 1999 Izmit earthquake rupture will be studied using TerraSAR-X Scansar and Stripmap data on two tracks. The objectives are to measure the tectonic strain accumulation due to plate motions, search for unknown faults to improve and spatially refine seismic hazard maps, reveal surface deformation caused by earthquakes and to constrain their focal mechanisms,·to better determine the postseismic deformation of the 1999 Izmit earthquake to understand the earthquake cycle, and monitor landslides and subsidence.

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