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Authors: Alessandra, Giuntini* 
Valerio, Materni* 
Stefano, Chiappini* 
Roberto, Carluccio* 
Rodolfo, Console* 
Massimo, Chiappini* 
Issue Date: 17-Jun-2013
Publisher: CTBTO
Keywords: travel-time, location, station correction, error ellipse
Subject Classification04. Solid Earth::04.02. Exploration geophysics::04.02.06. Seismic methods 
04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring 
05. General::05.01. Computational geophysics::05.01.03. Inverse methods 
05. General::05.01. Computational geophysics::05.01.05. Algorithms and implementation 
Abstract: Accurate earthquake locations are crucial for investigating seismogenic processes, as well as for applications like verifying compliance to the Comprehensive Test Ban Treaty (CTBT). Earthquake location accuracy is related to the degree of knowledge about the 3-D structure of seismic wave velocity in the Earth. It is well known that modeling errors of calculated travel times may have the effect of shifting the computed epicenters far from the real locations by a distance even larger than the size of the statistical error ellipses, regardless of the accuracy in picking seismic phase arrivals. We have developed a method of seismic location to minimize this systematic shifts affecting hypocentral locations. These method is based on the fact that such shifts are quite similar for events for which the hypocenters are close to each other with respect to their distance from the recording stations. So this method is based on a set of Ground Truth events recorded by a dense local seismic network in seismically active regions. The applications concern seismic sequences recorded in Italy and Iran. We show that mislocations of the order of 10-20 km affecting the epicenters, as well as larger mislocations in hypocentral depths, calculated from a global seismic network can be effectively removed by applying source-specific station corrections applied to the standard IASPEI91 travel times. This method is valid only for the area where calibration events are located but it is valid for any subset of the station network used for the calibration.
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