Abstract
Abstract. KOERI has a long history of earthquake seismology, beginning its observations right after the devastating earthquake on 10 July 1894 in Istanbul, by deploying the first seismograph in the region. Naturally, its seismic network and earthquake catalog evolved since that time, in harmony with the progress in the science of seismology. Currently, the seismic network consists of 242 stations that record approximately 1500 earthquakes per month during periods of regular seismicity. Magnitude is one of the most critical parameters in determining the size of an earthquake, especially in seismic hazard assessment studies. The objective of this study is to homogenize the magnitudes of the KOERI catalog between 2008 and 2018. For this aim, we computed the Magnitude of Completeness (Mc) for two different time periods between 2008–2011 and 2012–2018 by taking into account the duration magnitude (Md) and local magnitude (Ml), where these parameters might not be available jointly for the both time periods considered. As a result, we present a relationship of Md and Ml magnitudes derived from and applicable to KOERI's earthquake catalogs.
Highlights
Turkey and surrounding regions form one of the most seismically active regions in the world
Kandilli Observatory and Earthquake Research Institute (KOERI) is one of the core participants and corporate founder of Observatories & Research Facilities for European Seismology (ORFEUS) and one of the primary nodes of the European Integrated Data Archive (EIDA), which is an initiative within ORFEUS
We presented the statistical analysis of the catalog by plotting the Md magnitude histogram and Ml magnitude histogram for the selected time intervals and computed the Magnitude Completeness Magnitude of Completeness (Mc) in these two different time intervals
Summary
Turkey and surrounding regions form one of the most seismically active regions in the world. Seismicity in Turkey and its surrounding regions is monitored by a number of different establishments. RETMC with the FDSN Network Code: KO (Bogaziçi University Kandilli Observatory And Earthquake Research Institute, 2001), is the oldest seismological observation center in Turkey monitoring the earthquake activity 24/7 (Louderback, 1948; Fettahoglu, 2012; Kalafat, 2017; Cambaz et al, 2019). KOERI is one of the core participants and corporate founder of Observatories & Research Facilities for European Seismology (ORFEUS) and one of the primary nodes of the European Integrated Data Archive (EIDA), which is an initiative within ORFEUS (http://www.orfeus-eu.org/data/eida/, last access: October 2019). The main motivation of this study is to find a way to homogenize KOERI’s earthquake catalog of different time periods and magnitude types
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