Determination of the Creep Rate by DINSAR in the Ismetpasa Segment of the NAFZ
Köksal, Eray1; Kutoglu, Hakan1; Deguchi, Tomonori2
1Bülent Ecevit University, TURKEY; 2Nitetsu Mining Company, JAPAN
The NAFZ is one of the most active fault systems in the world. Because of 12 great earthquakes which occur from east to west of Turkey, the NAFZ has been threating the Marmara Region in which 20 million people live.
The Ismetpasa segment of the North Anatolian Fault (NAF) is one of the rare places in the world, where aseismic creep is observed. This segment, which was ruptured the 1944 Gerede (7.3 Mw) and 1951 Kursunlu (6.9 Mw) earthquakes respectively in the western and eastern tails, is located in the Middle western part of the NAF where it rotates to the west. The creep behavior in this segment was discovered firstly in 1950, and monitored by different surveying techniques up to now.
In this study, the creep rate of the segment has been studied by DINSAR technique between 2007-2010. For DINSAR analysis, 22 Envisat and 17 Palsar data were utilized. Envisat data are suppied from ESA . The results showed that the rate has decreased to 1.3 cm a year. This result might be an indication of stress starting increase.