Abstract
INTRODUCTION Seismologists have always striven to determine earthquake parameters as soon as possible after an earthquake occurs. Now there are several research groups that routinely “broadcast” their rapid determinations of earthquake location, focal mechanism, size, and depth. We report on our efforts to produce and “broadcast” source time functions of earthquakes. The steady march of technical progress in seismology has provided first for the rapid determination of epicenter and magnitude (e.g., from the National Earthquake Information Center [NEIC] and various regional networks). Technical requirements for this effort are that several stations have their output telemetered to some location where the arrivals can be picked and that at least one of these stations be well-calibrated so that magnitude can be estimated. This technical level and service has been available for several decades. In some cases, this procedure has been completely automated with earthquake alarms issued with no human intervention. It is...
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