When does a big earthquake occur?

I often have a dream of an earthquake recently. I think that there was an earthquake of magnitude :3.8 in 22:31 on May 5th in Iwate-ken. That's impossible, did you feel the shaking and have a dream?

18:20 seems to be magnitude :4.9 and maximum seismic intensity :4 in Niigata-ken Nakakoshi area on May 1st for a recent big earthquake. An earthquake is its own size for "the magnitude", and "the seismic intensity" shows the strength of shaking a person feels. I think that a small earthquake has happened every day in Japan in an earthquake major power.

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