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The seismic activity in the Japan Sea off the Sanriku coast has escalated from a magnitude 4.7 to 5.5 earthquake with increasing estimated intensity.

Public SafetyWeatherApr 20, 2026score 0.174 posts · 0 replies across 1 instances
The thread reports a series of earthquakes in the Japan Sea off the Sanriku coast, with increasing magnitudes and intensities over time. The updates include initial, intermediate, and final reports, indicating the progression of the seismic event and its potential impact on the region.

Claims

The seismic activity in the Japan Sea off the Sanriku coast has escalated from a magnitude 4.7 to 5.5 earthquake with increasing estimated intensity.
Parent: Public SafetyEntity: Earthquake ResponseImpact: negativeDate: Apr 20, 2026Target: The effectiveness of earthquake response and preparedness measures in the region.

Source posts

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■■緊急地震速報(第1報)■■ 三陸沖で地震 最大震度 2(推定) [詳細] 2026/04/20 17:30:07発生 M4.7 深さ 20km #earthquake
0 boosts · 0 favs · 0 replies · Apr 20, 2026
#earthquake
@[email protected]
■■緊急地震速報(最終報)■■ 三陸沖で地震 最大震度 2(推定) [詳細] 2026/04/20 17:30:07発生 M4.8 深さ 20km #earthquake
0 boosts · 0 favs · 0 replies · Apr 20, 2026
#earthquake
@[email protected]
■■緊急地震速報(第7報)■■ 三陸沖で地震 最大震度 3(推定) [詳細] 2026/04/20 17:32:46発生 M5.5 深さ 30km #earthquake
0 boosts · 0 favs · 0 replies · Apr 20, 2026
#earthquake
@[email protected]
■■緊急地震速報(最終報)■■ 三陸沖で地震 最大震度 3(推定) [詳細] 2026/04/20 17:32:46発生 M5.5 深さ 30km #earthquake
0 boosts · 0 favs · 0 replies · Apr 20, 2026
#earthquake