Séisme modéré mag. 4.2 - Préfecture de Fukushima, 46 km à l'est de Tōkamachi, Japon, dimanche, 18 juil. 2021 19:11 (GMT +9) -
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Séisme modéré magnitude 4.2 à 4.2 km de profondeur
18 Jul 10:18 UTC: Premier à signaler: NIED après 7 minutes.
Update Sun, 18 Jul 2021, 10:24
Moderate tremor of magnitude 4.2 just reported 46 km east of Tōkamachi, Japan4.2 quake 18 Jul 7:11 pm (GMT +9)
A magnitude 4.2 earthquake near Tōkamachi, Tōkamachi-shi, Niigata, Japan, was reported only 13 minutes ago by Japan's National Research Institute for Earth Science and Disaster Resilience (NIED), considered the main national agency that monitors seismic activity in this part of the world. The earthquake occurred at a very shallow depth of 4.2 km beneath the epicenter early evening on Sunday 18 July 2021 at 7:11 pm local time. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.
A second report was later issued by the European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 4.4 earthquake.
Based on the preliminary seismic data, the quake should not have caused any significant damage, but was probably felt by many people as light vibration in the area of the epicenter.
Weak shaking might have been felt in Shiozawa (pop. 20,200) located 38 km from the epicenter.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Tōkamachi (pop. 41,100) located 46 km from the epicenter, Numata (pop. 45,500) 51 km away, Imaichi (pop. 64,300) 52 km away, Nagaoka (pop. 195,300) 58 km away, Sandyo (pop. 82,900) 69 km away, and Kanuma (pop. 94,900) 70 km away.
A second report was later issued by the European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 4.4 earthquake.
Based on the preliminary seismic data, the quake should not have caused any significant damage, but was probably felt by many people as light vibration in the area of the epicenter.
Weak shaking might have been felt in Shiozawa (pop. 20,200) located 38 km from the epicenter.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Tōkamachi (pop. 41,100) located 46 km from the epicenter, Numata (pop. 45,500) 51 km away, Imaichi (pop. 64,300) 52 km away, Nagaoka (pop. 195,300) 58 km away, Sandyo (pop. 82,900) 69 km away, and Kanuma (pop. 94,900) 70 km away.
Earthquake data
Détails du séisme
| Date et l'heure | 18 Jul 2021 10:11:05 UTC - |
| Heure locale à l'épicentre | dimanche, 18 juil. 2021 19:11 (GMT +9) |
| Statut | Confirmé |
| Magnitude | 4.2 |
| Profondeur | 4.2 km |
| Épicentre latitude / longitude | 37.056°N / 139.274°E  (Minamiaizu-gun, Préfecture de Fukushima, Japon) |
| Antipode sismique | 37.056°S / 40.726°W |
| Intensité d'agitation | Secousses modérées près de l'épicentre |
| Senti | 0 rapports |
| Source de données principale | NIED (National Research Institute for Earth Science and Disaster Resilience) |
| Volcan le plus près | Hiuchi (12 km / 7 mi) |
| Lieux à proximité | 38 km E de Shiozawa (Minamiuonuma, Niigata) (pop: 20,200) | Carte | Séismes à proximité 46 km E de Tōkamachi (Niigata) (pop: 41,100) | Carte | Séismes à proximité 51 km NNE de Numata (Gunma) (pop: 45,500) | Carte | Séismes à proximité 52 km NO de Imaichi (Tochigi) (pop: 64,300) | Carte | Séismes à proximité 58 km SE de Nagaoka (Niigata) (pop: 195,300) | Carte | Séismes à proximité 69 km SSE de Sandyo (Prefectura de Niigata) (pop: 82,900) | Carte | Séismes à proximité 70 km NO de Kanuma (Tochigi) (pop: 94,900) | Carte | Séismes à proximité 131 km SO de Fukushima (pop: 294,200) | Carte | Séismes à proximité 132 km NNO de Saitama (pop: 1,193,400) | Carte | Séismes à proximité 157 km NNO de Tokyo (pop: 8,336,600) | Carte | Séismes à proximité |
| Météo à l'épicentre au moment du séisme | Moderate Rain  22.8°C (73 F), humidity: 91%, wind: 1 m/s (2 kts) from S |
| Énergie sismique estimée libérée | 1.3 x 1011 joules (35 MWh, équivalent à 30.1 tonnes de TNT) | about seismic energy |
Données pour le même séisme indiquées par différentes agences
Info : Plus les agences signalent le même séisme et publient des données similaires, plus vous pouvez avoir confiance dans les données. Il faut normalement jusqu'à quelques heures pour que les paramètres sismiques soient calculés avec une précision quasi optimale.
| Mag. | Profondeur | Lieu | Source |
| 4.2 | 4.2 km | Japan: WESTERN FUKUSHIMA PREF | NIED |
| 4.5 | 15 km | EASTERN HONSHU, JAPAN | EMSC |
| 4.5 | 10 km | 30 Km ESE of Muikamachi, Japan | USGS |
Témoignages pour ce séisme
Les rapports des utilisateurs estiment l'intensité perçue des secousses du sol en fonction de l' Échelle MMI (Modified Mercalli Intensity Scale).
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