Underground Explosion in Japan?

M 5.3 – 11 km SE of Okunoya, Japan

  • 2020-05-31 21:02:10 (UTC)
  • 36.217°N 140.510°E
  • 90.3 km depth

The depth is 90km, quite deep. But the seismogram shows Explosion rather than Earthquake.

If you cannot find P waves, it should NOT earthquake.

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