What Caused the M 7.0 Earthquake in NE Honshu, Japan?

[davenn]

A preliminary Mw7.0, NE Honshu, Japan. Approx in the Sendai area
It is right on the coast

My seismo
My Seismograms (sydneystormcity.com)

M 7.0 - 27 km ENE of Ishinomaki, Japan (usgs.gov)

 

[Astronuc]

M 7.0 - 27.5 km (17.1 mi) ENE of Ishinomaki, Miyagi, Japan 27.5 km (17.1 mi)

• 2021-03-20 09:09:45 (UTC)
• 38.475°N 141.607°E
• 54.0 km depth

Today's earthquake is closer to the coast and deeper than the great Tohoku Earthquake of March 11, 2011 (ten years and 9 days ago).

For comparison: M 9.1 - 2011 Great Tohoku Earthquake 94.5 km (58.7 mi) E of Ishinomaki, Miyagi, Japan,
https://earthquake.usgs.gov/earthquakes/eventpage/official20110311054624120_30/executive

• 2011-03-11 05:46:24 (UTC)
• 38.297°N 142.373°E
• 29.0 km depth

 

[Astronuc]

M 7.1 - https://www.physicsforums.com/threads/m-7-1-70-km-ene-of-namie-japan.999662/

• 2021-02-13 14:07:50 (UTC) - 35 days (5 weeks) ago
• 37.760°N, 141.720°E
• 51.9 km depth

81.7 km (50.8 mi) SSE of Ishinomaki, Miyagi, Japan
80.12 km (49.8 mi) S of today's M 7.0 earthquake (38.475°N, 141.607°E)