ANALYSIS OF THE RELATIONSHIP BETWEEN ASSOCIATED VOLCANIC AND SEISMIC EVENTS
JOHN CARROLL UNIV CLEVELAND OH
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The purpose of the study was to determine whether or not volcanic quakes are the same as ordinary earthquakes, and if not, just how they differ and what seismic parameters can be used to identify them. Three areas were selected for investigation Italy, Hawaii and Japan. Volcanoes in Italy and Japan are explosive while those in Hawaii are not. Seismic data from all three areas were analyzed. Crustal models and seismic wave velocities, where available, were used as a basis for locating epicenters. Graphical methods such as the delta P-H Arc-Distance Method and the Hyperbolic Method were used to locate epicenters. A computer program was set up for the same purpose. Several techniques were developed to augment the use of data in the computer program. One of these was the technique of supplying a fictitious arrival time at a seismic station and varying this arrival time value until all the input data converged to a solution. Results of the graphical solutions and those from the computer program were in excellent agreement.