Abstract
The Japan Meteorological A gency is responsible for the issuance of the warning for near and distant tsunamis. The time limit of the warning issuance is twenty minutes after a tsunami occurring in a region within 600 km from the Japanese coasts.
The number of data sent through the exclusive telegraph of the Agency by seismic monitoring stations amounts to more than one hundred within ten minutes after the occurrence of a large earthquake. It is not an easy task to process manually all the information in the short period of time, and it is urgently required that this task to be automated.
The telegram data, however, are less accurate than those measured in a normal condition, and sometimes the data are in confusion. The most difficult problem in the automatic processing of the tsunami warning data is the rejection of incorrect data in the course of computation. The difficulty, however, will be overcome by making use of a man-machine communication system in the data processing.
From this viewpoint, a program for analyzing data for the tsunami warning is written for a computer of small capacity consisting of a video display and other devices.
The program is tested using some earthquakes occurring in and near Japan and the results prove successful. The system will reduce remarkably the time limit of the issuance of the tsunami warning.
