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1983年6月1日在东京国土地理院目黑厅舍召开的日本地震预报联络会特别会议上,日本气象厅报告说,5月31日他们通过分析得知:带来海啸灾害的日本海中部地震是正断层型地震。在此以前,日本海方面还未有过里氏7级以上正断层型的大地震的记录,这回是第一次。气象厅及地震学者们在地震发生后,一直都估计是逆断层地震。6月1日的报告,推翻了他们的定论,致使他们茫然不知所措,看来重新认识地震预报观测体制成了很大的课题。日本气象厅地震预报情报课详细地分析了从日本各气象台、测候所收集的地震仪记录图表,制成了地震初波“向上”及“向下”的分布图。结果得知:这次地震是以震源区秋田近
At a special meeting of the Japan Earthquake Prediction liaison conference held in Tokyo’s Department of Geography and Geography, June 1, 1983, the Japan Meteorological Agency reported that on May 31st they analyzed through analysis that the Central Japan Sea Zone that caused the tsunami disaster Earthquakes are normal-fault earthquakes. Prior to this, the Japan Sea has not yet recorded a record of the Richter than normal magnitude earthquake of magnitude 7 or above, this time for the first time. Meteorological agencies and seismologists have been estimated to be reverse-fault earthquakes after the earthquake. The report of June 1 overturned their conclusion, leaving them at a loss. It seems that re-understanding of the earthquake prediction observation system has become a major issue. Japan Meteorological Agency Earthquake Prediction Information Section analyzed in detail the seismograph records collected from various Japanese meteorological observatories and geophysical surveys and made distribution maps of “up” and “down” for the initial wave of the earthquake. The results showed that: This earthquake is based on the source area Akita