Detection of fault creep around NAF by InSAR time series analysis using PALSAR data

Abstract

North Anatolian Fault (NAF) has several records of a huge earthquake occurrence in the last one century, which is wellknown as a risky active fault. Some signs indicating a creep displacement could be observed on the Ismetpasa segment. It is reported so far that the San Andreas Fault in California, the Longitudinal Valley fault in Taiwan and the Valley Fault System in Metro Manila also exhibit fault creep. The fault with creep deformation is aseismic and never generates the large-scale earthquakes. But the scale and rate of fault creep are important factors to watch the fault behavior and to understand the cycle of earthquake.The purpose of this study is to investigate the distribution of spatial and temporal change on the ground motion due to fault creep in the surrounding of the Ismetpasa, NAF. DInSAR is capable to catch a subtle land displacement less than a centimeter and observe a wide area at a high spatial resolution. We applied InSAR time series analysis using PALSAR data in order to measure long-term ground deformation from 2007 until 2011. As a result, the land deformation that the northern and southern parts of the fault have slipped to east and west at a rate of 7.5 and 6.5 mm/year in line of sight respectively were obviously detected. In addition, it became clear that the fault creep along the NAF extended 61 km in east to west direction.

Seafloor Geodesy Revealed Partial Creep of the North Anatolian Fault Submerged in the Sea of Marmara

“…In İsmetpaşa, central Turkey, a stable aseismic creep (~8 mm/year) was found based on InSAR (e.g., Deguchi, 2011;Kaneko et al, 2013) and Global Navigation Satellite System (GNSS; e.g., Özener et al, 2013) observations. In İsmetpaşa, central Turkey, a stable aseismic creep (~8 mm/year) was found based on InSAR (e.g., Deguchi, 2011;Kaneko et al, 2013) and Global Navigation Satellite System (GNSS; e.g., Özener et al, 2013) observations.…”

Interseismic deformation and creep along the central section of the North Anatolian Fault (Turkey): InSAR observations and implications for rate‐and‐state friction properties

“…[27] To further constrain the inferred friction parameters and the size of the velocity-strengthening layer among the cases with small misfits, we compare the simulated evolution of creep rates to the reported creep rates at Ismetpasa from previous studies (Figure 9) [Ambraseys, 1970;Aytun, 1982;Eren, 1984;Altay and Sav, 1991;Deniz et al, 1993;Cakir et al, 2005;Kutoglu and Akcin, 2006;Kutoglu et al, 2008Kutoglu et al, , 2010Karabacak et al, 2011;Deguchi, 2011;Ozener et al, 2012]. Estimated creep rates reported in the previous studies were based on conventional surveying methods, GPS, LiDAR, or InSAR techniques (Figure 9), Figure 9.…”

Historical account of monitoring the North Anatolian Fault at the Ismetpasa segment and the latest findings

“…He concluded that the creep rate along the Ismetpasa segment was 14 mm/yr in the line of sight [50].…”

“…Another work applying InSAR time series analysis for the same region is carried out by Deguchi [50] using Palsar data in order to measure long-term ground deformation from 2007 to 2011. He concluded that the creep rate along the Ismetpasa segment was 14 mm/yr in the line of sight [50].…”