EARTHQUAKES IN THE UNITED STATES 1963-64 AND AN EVALUATION OF THE DETECTION CAPABILITY OF THE UNITED STATES SEISMOGRAPH STATIONS
COAST AND GEODETIC SURVEY WASHINGTON DC
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This study is based on earthquakes reported on the Preliminary Determination of Epicenter P.D.E. cards of the Coast and Geodetic Survey. Four types of presentations are made 1 a chronological list of earthquakes 2 a magnitude map showing the geographical distribution of earthquakes whose magnitudes are greater than, or equal to, 3.0 3 a presentation of frequency versus magnitude for the total United States for and individual regions of high seismicity and 4 a seismicity map giving a quantitative measure of relative seismic activity.