W. J. Person 1976 <p>October was an active month seismically, although there were no damaging earthquakes in the United States. Several States experienced earthquakes that were felt sharply. There were four major earthquakes in other parts of the world, including a magntidue 7.4 in the Philippine Islands that killed on person.&nbsp;</p> application/pdf en U.S Geological Survey Earthquakes, October 1975 article