Analysis of the stress distribution of North Anatolian Fault Zone for the part between Amasya-Tokat cities

Year 2022, Volume: 169 Issue: 169, 121 - 133, 05.12.2022

Ayça Çırmık Ufuk Aydın Oya Pamukçu Fikret Doğru

https://doi.org/10.19111/bulletinofmre.1022323

Abstract

Tectonic forces formed in the continental crust, cause permanent changes in stress, compression and deformation. The amplitudes of earthquake waves vary with the stress/strain distribution in the crust. In this study, the change of stress/strain and regional absorption coefficient, which is effective in tectonic forces caused by elastic deformation energy accumulating in the brittle crust over time, was investigated. The study area is the middle part of the North Anatolian Fault Zone and the area formed by Ezinepazarı fault zone and Merzifon fault zone. In this area, Coulomb stress analysis was carried out by using the focal mechanism solution values of the earthquake that occurred in Yoldere - Erbaa, Tokat on October 9, 2015 (ML=5.1). In order to examine the deformation caused by this earthquake in and around the study area, Global Navigation Satellite System (GNSS) data were evaluated and the velocities of these stations were calculated using GNSS data of these stations for the years 2013-2014-2015-2016. Also, regional absorption coefficients were determined by using earthquake data. As a result, Coulomb stress analysis results, velocity values distribution obtained from GNSS data and absorption findings obtained from seismological  study were evaluated together.

Keywords

GNSS, Regional Absorption Coefficient, Coulomb Stress / Strain Analysis.

Supporting Institution

Atatürk University and Dokuz Eylül University.

Project Number

Project No: 8443

Thanks

This research was conducted as part of the Atatürk University Scientific Research Projects Project No: 8443), which was a collaborative effort between Atatürk University and Dokuz Eylül University. GNSS data used in the study were provided from the CORS-TR system is operated by the General Directorate of Maps and the General Directorate of Land Registry and Cadastre. Generic Mapping Tools (GMT) were used to create some figures (Wessel et al., 2019). We'd like to express our gratitude to the three referees for their time and participation in the article's development.

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