Large aperture seismic telemetering system for central Alaska

Abstract

The Geophysical Institute has established and now operates a large aperture seismic telemeter network in Alaska. At present four stations are operated and two more will be added shortly. The system is described in its technical details, including the remote site equipment and the method of recording at the Geophysical Institute. Without the use of methods for improving signal-to-noise ratio (such as velocity and/or frequency filtering) the sensitivity of the seismic stations for detecting distant earthquakes is similar to that of the U.S.C.&G.S. College Observatory. This sensitivity allows recording of earthquakes down to magnitude 4 (U.S.C.&G.S. magnitude) in the 80° distant range. Epicenter maps for three 1-month periods for interior and coastal Alaska are presented.