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Fussa Japan (143.2 km S of epicenter) [Map] / Very weak shaking (MMI II) : I was sitting on the couch, I am on the 9th foot and the couch felt like it shook. Like a wobble feeling
Séisme modéré mag. 4.4 - Préfecture de Gunma, 46 km à l'est de Tōkamachi, Japon, dimanche, 18 juil. 2021 18:50 (GMT +9) -
Données sismiques | Carte interactive | Témoignages | Séismes antérieurs ici | Séismes Japon | Préfecture de Gunma | Préfecture de Niigata | Préfecture de Tochigi | Saitama | Préfecture de Tokyo
Séisme modéré magnitude 4.4 à 3.7 km de profondeur
18 Jul 09:54 UTC: Premier à signaler: VolcanoDiscovery après 4 minutes.
18 Jul 09:57: Maintenant en utilisant une nouvelle source de données: NIED
18 Jul 09:57: Maintenant en utilisant une nouvelle source de données: NIED
Update Sun, 18 Jul 2021, 10:03
Magnitude 4.4 earthquake strikes near Numata, Gunma, Japan4.4 quake 18 Jul 6:50 pm (GMT +9)
Japan's National Research Institute for Earth Science and Disaster Resilience (NIED) reported a magnitude 4.4 quake in Japan near Numata, Gunma, only 13 minutes ago. The earthquake hit early evening on Sunday 18 July 2021 at 6:50 pm local time at a very shallow depth of 3.7 km. 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.
Our monitoring service identified a second report from the European-Mediterranean Seismological Centre (EMSC) which listed the quake at magnitude 4.7.
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, Nikkō (pop. 16,000) 45 km away, Tōkamachi (pop. 41,100) 46 km away, Numata (pop. 45,500) 49 km away, and Imaichi (pop. 64,300) 51 km away.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Nagaoka (pop. 195,300) located 59 km from the epicenter, Kanuma (pop. 94,900) 68 km away, and Maebashi (pop. 282,700) 73 km away.
VolcanoDiscovery will automatically update magnitude and depth if these change and follow up if other significant news about the quake become available. If you're in the area, please send us your experience through our reporting mechanism, either online or via our mobile app. This will help us provide more first-hand updates to anyone around the globe who wants to know more about this quake.
Our monitoring service identified a second report from the European-Mediterranean Seismological Centre (EMSC) which listed the quake at magnitude 4.7.
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, Nikkō (pop. 16,000) 45 km away, Tōkamachi (pop. 41,100) 46 km away, Numata (pop. 45,500) 49 km away, and Imaichi (pop. 64,300) 51 km away.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Nagaoka (pop. 195,300) located 59 km from the epicenter, Kanuma (pop. 94,900) 68 km away, and Maebashi (pop. 282,700) 73 km away.
VolcanoDiscovery will automatically update magnitude and depth if these change and follow up if other significant news about the quake become available. If you're in the area, please send us your experience through our reporting mechanism, either online or via our mobile app. This will help us provide more first-hand updates to anyone around the globe who wants to know more about this quake.
Earthquake data
Détails du séisme
| Date et l'heure | 18 Jul 2021 09:50:07 UTC - |
| Heure locale à l'épicentre | dimanche, 18 juil. 2021 18:50 (GMT +9) |
| Statut | Confirmé |
| Magnitude | 4.4 |
| Profondeur | 3.7 km |
| Épicentre latitude / longitude | 37.04°N / 139.272°E  (Préfecture de Gunma, Japon) |
| Antipode | 37.04°S / 40.728°W |
| Intensité d'agitation | Secousses modérées près de l'épicentre |
| Senti | 1 rapports |
| Source de données principale | NIED (National Research Institute for Earth Science and Disaster Resilience) |
| Volcan le plus près | Hiuchi (10 km / 6 mi) |
| Lieux à proximité | 38 km E de Shiozawa (Minamiuonuma, Niigata) (pop: 20,200) | Carte | Séismes à proximité 45 km NO de Nikkō (Nikko, Tochigi) (pop: 16,000) | Carte | Séismes à proximité 46 km ESE de Tōkamachi (Niigata) (pop: 41,100) | Carte | Séismes à proximité 49 km NNE de Numata (pop: 45,500) | Carte | Séismes à proximité 51 km NO de Imaichi (Tochigi) (pop: 64,300) | Carte | Séismes à proximité 59 km SE de Nagaoka (Niigata) (pop: 195,300) | Carte | Séismes à proximité 68 km NO de Kanuma (Tochigi) (pop: 94,900) | Carte | Séismes à proximité 73 km NNE de Maebashi (pop: 282,700) | Carte | Séismes à proximité 131 km NNO de Saitama (pop: 1,193,400) | Carte | Séismes à proximité 155 km NNO de Tokyo (pop: 8,336,600) | Carte | Séismes à proximité |
| Météo à l'épicentre au moment du séisme | Light Rain  23.8°C (75 F), humidity: 90%, wind: 1 m/s (2 kts) from S |
| Énergie sismique estimée libérée | 2.5 x 1011 joules (69.8 MWh, équivalent à 60 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 |
| 4.4 | 3.7 km | Japan: WESTERN FUKUSHIMA PREF | NIED |
| 4.6 | 47 km | EASTERN HONSHU, JAPAN | EMSC |
| 4.6 | 10 km | Eastern Honshu, Japan | GFZ |
| 4.6 | 10 km | 29 Km ESE of Muikamachi, Japan | USGS |
Témoignages pour ce séisme (1)
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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