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

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A Mw 7.0 earthquake occurred near Sendai, Japan, specifically 27 km ENE of Ishinomaki, at a depth of 54 km on March 20, 2021. This event is notable for being closer to the coast and deeper than the 2011 Great Tohoku Earthquake, which had a magnitude of 9.1 and occurred 94.5 km E of Ishinomaki. The recent earthquake's coordinates are 38.475°N and 141.607°E, marking a significant seismic event in the region, especially as it falls just days after the 10th anniversary of the devastating 2011 quake. Comparisons with previous seismic activity, including a M 7.1 quake from February 2021, highlight ongoing tectonic activity in this area.
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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
 

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