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western quebec and southern ontario - Department of Geology

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Figure 3.7: Vertical component waveforms <strong>of</strong> the earthquake on February 25, 2006 (m N4.5) recorded at epicentral distance up to 300 km. The approximate Pg- <strong>and</strong> Sg- arrivalsare shown by red lines.The arrival times <strong>of</strong> all possible phases (Pg, Pn, Sg, Sn) were picked on allstations up to 1000 km for all 50 studied earthquakes. The arrival times obtained from theGeological Survey <strong>of</strong> Canada were used as preliminary estimation <strong>of</strong> the arrival times.The output file from the PLTSEK program with the arrival times with their weights <strong>and</strong>the polarities <strong>of</strong> P-waves was a TPK file for each event. These files were converted toHYPOCENTER input file (NORDIC format) for hypocentre location.36

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