The availability of high-quality digital seismic data has never been better than it is today. Through consortia such as the Incorporated Research Institutions for Seismology (IRIS) and Observatories and Research Facilities for European Seismology (ORFEUS), waveform data from stations of many worldwide networks are available via the Internet to the international community of seismologists. When a user examines a segment of data, it is assumed that the time displayed is the exact time in Coordinated Universal Time (UTC) at which the motion was recorded. In general, when retrieving data segments from a waveform repository, there is no independent confirmation of...

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