Deep crustal structure of the North Anatolian Fault and the earthquake cycle Dense Array for Northern Anatolia

Abstract

A passive seismic experiment was conducted across the North Anatolian Fault Zone in the region of the rupture of the 1999 Izmit earthquake (M=7.6). The project aimed to resolve the fine scale crustal structure of the Fault Zone using scattered seismic waves. The 63 autonomous seismic stations were deployed on a regular grid covering approximately 35 by 70 km with a nominal station spacing of 7 km. The network also included 3 permanent stations of the Turkish National Earthquake Monitoring Network. The network was augmented by 7 autonomous seismic stations forming a semi-circle around the dense array and provided by the Kandilli Observatory and Earthquake Research Institute (KOERI). Stations were recording continuously at 50Hz sampling rate between May 2012 and September 2013. The data quality of DANA was generally good despite many stations being deployed in industrial and heavily populated areas. Data recovery across the whole network (including KOERI stations, but not permanent stations) was excellent with an average data recovery of 94%. The data from DANA offers opportunity for a multitude of analysis methods. Analysis of the data is ongoing, but several initial results are in revision or have been published. These include a detailed receiver function analysis, local earthquake detection and location and resolution of crustal structure from transfer functions.