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The effectiveness of earthquake early warning systems in Japan is being tested by recent seismic events in the Sanriku region.

Public SafetyGeological ActivityApr 20, 2026score 0.173 posts · 0 replies across 1 instances
This thread reports on a series of earthquakes in the Japan Sea off the Sanriku coast, with increasing magnitudes and varying depths. The updates indicate a potential for escalating seismic activity, raising concerns about regional safety and preparedness.

Claims

The effectiveness of earthquake early warning systems in Japan is being tested by recent seismic events in the Sanriku region.
Parent: Public SafetyEntity: Earthquake early warning systemsImpact: neutralDate: Apr 20, 2026 - Apr 21, 2026Target: Effectiveness of earthquake early warning systems

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
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■■緊急地震速報(第3報)■■ 三陸沖で地震 最大震度 2(推定) [詳細] 2026/04/20 17:32:46発生 M5.2 深さ 10km #earthquake
0 boosts · 0 favs · 0 replies · Apr 20, 2026
#earthquake
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■■緊急地震速報(第6報)■■ 三陸沖で地震 最大震度 3(推定) [詳細] 2026/04/20 17:32:43発生 M5.4 深さ 40km #earthquake
0 boosts · 0 favs · 0 replies · Apr 20, 2026
#earthquake
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■■緊急地震速報(第5報)■■ 三陸沖で地震 最大震度 2(推定) [詳細] 2026/04/20 21:56:46発生 M5.1 深さ 10km #earthquake
0 boosts · 0 favs · 0 replies · Apr 20, 2026
#earthquake
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■■緊急地震速報(第3報)■■ 三陸沖で地震 最大震度 2(推定) [詳細] 2026/04/20 21:56:46発生 M5.0 深さ 10km #earthquake
0 boosts · 0 favs · 0 replies · Apr 20, 2026
#earthquake
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■■緊急地震速報(第2報)■■ 三陸沖で地震 最大震度 2(推定) [詳細] 2026/04/20 21:56:46発生 M5.1 深さ 10km #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 2(推定) [詳細] 2026/04/20 21:56:46発生 M5.3 深さ 10km #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 1(推定) [詳細] 2026/04/21 01:15:28発生 M4.4 深さ 10km #earthquake
0 boosts · 0 favs · 0 replies · Apr 20, 2026
#earthquake
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■■緊急地震速報(第2報)■■ 三陸沖で地震 最大震度 2(推定) [詳細] 2026/04/21 11:35:45発生 M4.4 深さ 10km #earthquake
0 boosts · 0 favs · 0 replies · Apr 21, 2026
#earthquake
@[email protected]
■■緊急地震速報(第1報)■■ 三陸沖で地震 最大震度 2(推定) [詳細] 2026/04/21 11:35:45発生 M4.4 深さ 10km #earthquake
0 boosts · 0 favs · 0 replies · Apr 21, 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] 2026/04/21 11:35:45発生 M4.7 深さ 10km #earthquake
0 boosts · 0 favs · 0 replies · Apr 21, 2026
#earthquake
@[email protected]
■■緊急地震速報(第3報)■■ 三陸沖で地震 最大震度 2(推定) [詳細] 2026/04/21 11:35:45発生 M4.7 深さ 10km #earthquake
0 boosts · 0 favs · 0 replies · Apr 21, 2026
#earthquake
@[email protected]
■■緊急地震速報(第2報)■■ 三陸沖で地震 最大震度 1(推定) [詳細] 2026/04/21 14:19:56発生 M4.3 深さ 10km #earthquake
0 boosts · 0 favs · 0 replies · Apr 21, 2026
#earthquake
@[email protected]
■■緊急地震速報(第1報)■■ 三陸沖で地震 最大震度 1(推定) [詳細] 2026/04/21 14:19:56発生 M4.3 深さ 10km #earthquake
0 boosts · 0 favs · 0 replies · Apr 21, 2026
#earthquake
@[email protected]
■■緊急地震速報(第1報)■■ 三陸沖で地震 最大震度 1(推定) [詳細] 2026/04/21 14:26:58発生 M4.2 深さ 10km #earthquake
0 boosts · 0 favs · 0 replies · Apr 21, 2026
#earthquake