Abstract
A unified catalog of earthquakes in Iran and adjacent regions (the area bounded in 22<sup>º</sup>-42<sup>º</sup>N and 42<sup>º</sup>-66<sup>º</sup>E) covering the period of 4<sup>th</sup> century B.C. through 2012 with M<sub>w</sub>≥4 is provided. The catalog includes all events for which magnitude have been determined by international agencies and most reliable individual sources. Since the recurrence time of maximum credible earthquake cannot be directly estimated from the m<sub>b</sub>, empirical formulae are established to convert m<sub>b</sub> to M<sub>s</sub>, m<sub>b</sub> to M<sub>w</sub> and M<sub>s</sub> to M<sub>w</sub> for each major seismotectonic province separately. The unified catalog is declustered using conjugated distance-time windows. In order to estimate completeness thresholds, magnitude-time (M-T) diagram and Stepp’s method are applied on the declustered catalog for each seismotectonic province. The magnitude of completeness (M<sub>c</sub>) decreases with development of local and regional seismic stations. The results of present study are particularly important in seismic hazard analysis in Iran.
Highlights
A homogenous earthquake catalog is a basic input for seismic hazard estimation and seismicity studies [e.g., Das et al 2011]
The present study provides a unified and a declustered catalog of earthquakes in Iran which covers the area bounded in 22°-42° N and 42°-66° E, including the territory of Iran and adjacent regions; eastern Iraq and eastern Turkey in the west, the Caucasus and southern Turkmenistan in the north, western Afghanistan and western Pakistan in the east, and Gulf of Oman and Persian Gulf in the south
In this study, the most complete unified and declustered catalog of earthquakes occurred before 2013, attributed to Iran and neighboring regions is compiled
Summary
A homogenous earthquake catalog is a basic input for seismic hazard estimation and seismicity studies [e.g., Das et al 2011]. In order to prepare homogeneous (unified) earthquake catalog for different seismic regions, various regression relation procedures have been used in various studies to convert different magnitude types to a preferred magnitude scale [Das et al 2011]. Completeness threshold for different magnitude classes is estimated for declustered and unified catalog of earthquakes in major seismotectonic provinces of Iran and neighboring regions using the Entire–Magnitude–Range (EMR) method [Woessner and Wiemer 2005]. For doing the ANOVA and the Tukey test, we generated N normal distributed random data for each region based on mean and standard deviation of the mean which is estimated for the slope coefficient. This is expected because the error of the horizontal component vmb is greater than that of the vertical component vMw
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