A Selected Events Recorder for Seismic Applications

摘要

The document describes a developmental, suitcase-size portable seismic recording station specifically tailored to micro-earthquake investigation. The total instrument package, including recorder, 24-hour battery pack, radio antenna, seismometer, and field wire weighs less than 100 pounds and can be hand-carried by two people into remote areas not accessible by other means. The recorder portion of the station is a two-channel, low speed, instrumentation-type magnetic tape recorder which was developed for this particular application. This recorder has the unique capability to edit incoming data and record only those signals that exceed a preset amplitude threshold while retaining the low-level preamble to the recorded event. A time signal derived from a National Bureau of Standards (WWVB) broadcast is recorded with the data to provide accurate event-time correlation. (Author)