Source processes of three complex deep focus earthquakes

The problems of epicentral location and methods for using information from several phases simultaneously to reduce the uncertainty in the location are discussed with emphasis on improving the seismogram deconvolution filter, possible sources of error encountered when converting analogue seismograms to digital form and a means of interactivity unravelling some of the complexity present in the body waves of the earthquakes studied. A technique for determining the source type, orientation and strength of an earthquake using body wave data and an inversion of the moment tensor used to describe the source is presented along with a master event scheme using relative amplitudes for determining source mechanisms. The results of the application of these methods are discussed for earthquakes that occurred in Peru-Bolivia (Aug. 15, 1963), Colombia (July 31, 1970), and the Sea of Okhotsk (August 30, 1970).