Relationships between fundamental seismic hazard parameters for the different source regions in Turkey

• Published in: Natural hazards (Dordrecht) Vol. 36; no. 3; pp. 445 - 462
• Main Authors: BAYRAK, Yusuf, YILMAZTÜRK, Ahmet, ÖZTÜRK, Serkan
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer 01.11.2005; Springer Nature B.V
• Subjects: Earth sciences; Earth, ocean, space; Earthquakes; Earthquakes, seismology; Engineering and environment geology. Geothermics; Exact sciences and technology; Internal geophysics; Natural hazards: prediction, damages, etc; Seismic activity; Seismic hazard; Middle East; Turkey; North Anatolian Fault; risk assessment; seismic hazard; modal values; epicenters; earthquakes; Gutenberg-Richter relationship; intensity; tectonic maps; surface waves; Asia; catalogs; regression; seismic sources; isoseismic maps; b value; seismic intensity; magnitude; tectonics; hypocenter; seismic waves; seismic risk
• ISSN: 0921-030X; 1573-0840
• DOI: 10.1007/s11069-005-4038-4

Turkey has been divided into eight different seismic regions taking into consideration the tectonic environments and epicenters of the earthquakes to examine relationships of the modal values (a/b), the expected maximum magnitudes (M^sub max^) and the maximum intensities (I^sub max^). For this purpose, the earthquakes for the time period 1900-1992 from the Global Hypocenter Data Base CD-ROM prepared by USGS, and for the time period 1993-2001 from the PDE data and IRIS data are used. Concerning the relationships developed between different magnitude scales and between surface wave magnitudes (M^sub S^) and intensity for different source regions in Turkey, we have constructed a uniform catalog of M^sub S^. We have estimated the values of M^sub max^ and I^sub max^ using the Gumbel III asymptotic distribution. Highest a-values are observed in the Aegean region and the lowest b-values are estimated for the North Anatolian Fault. Maximum values of a/b, M^sub max^ and I^sub max^ are related to the eastern and western part of the North Anatolian Fault and the Aegean Arc. The lowest values of all parameters are observed near the Mid Anatolian Fault system. Linear relationships have been calculated between a/b, M^sub max^ and I^sub max^ using orthogonal regression. If one of the three parameters is computed, two other parameters can be calculated empirically using these linear relationships. Hazard maps of M^sub max^ and I^sub max^ values are produced using these relationships for a grid of equally spaced points at 1°. It is observed that the maps produced empirically may be used as a measure of seismic hazard in Turkey.[PUBLICATION ABSTRACT]