Abstract
After the establishment of the seismic observation network of southern Okinawa in August, 1988 by the JMA (Japan Meteorological Agency), many hypocenters of earthquakes have been located. However, due to the small number of observation stations and narrow configuration of the array, the hypocenters located contain some systematic errors. Numerical experiments on the extent of the errors and the reliability of the JMA seismic observation network showed that the obtained hypocenters deeper than 100 km were reliable, but that for the obtained hypocenters shallower than 100 km, only the epicenters were reliable.
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