CONSISTENCY OF IDC REVIEWED EVENT BULLETIN WITH OTHER GLOBAL AND NATIONAL SEISMIC BULLETINS IN THE IRANIAN PLATEAU

The Reviewed Event Bulletin (REB) is a final and standard product of the processing and analysis of seismic and other waveform data in the International Data Center (IDC). The REB is the expression of global seismicity as detected by the International Monitoring System (IMS) network. The bulletin contains all standard event parameters and all standard signal parameters for associated signals, for each signal detection associated with each event. The uncertainties of the standard event parameters are also included. The IDC has produced the bulletin from February 2000, routinely. For civil and scientific applications, the REB is contributed to the International Seismological Centre (ISC) for inclusion in their seismological catalogue of global seismicity. Digital seismic networks have been active since 1996 in Iran. However, a comprehensive bulletin of local and regional earthquakes has been available only since 2006 with the establishment of the Iranian Seismological Center (IRSC). The IRSC bulletin provides a basic requirement for seismological studies in this region of high occurrence rate of catastrophic earthquakes. The ISC bulletin contains data from 1900 and relies on data contributed by seismological agencies from around the world. The Reviewed ISC bulletin, which is manually checked by ISC analysts and relocated (when there are sufficient data) is currently available up to December 2016. For consistency and quality assessment, the REB for the years 2006 to 2017 has been compared to ISC (Global) and IRSC (National) bulletin for events that occurred in the Iranian plateau (Lat: 24º-42º N, Lon: 42º-64º E) at the same time period. This area is one of the most seismically active region and being crossed by several active faults so it supposed to be reliable enough to be used as a reference data set for testing the results obtained by the IDC. These evaluations aim at:The consistency of earthquake location accuracy for identical events in the REB and ISC and IRSC bulletin; the number of events which the REB may contain in compared to the other bulletin; the number of events in the ISC/IRSC bulletins missing from the REB; and comparing magnitude of events in three bulletin.

Keywords:

Earthquake location accuracy , IDC , ISC bulletin , IRSC bulletin , Iran plateau