Written by on . Last updated March 2nd, 2024.

In the Sea of Japan 90 kilometer from Jōetsu, Japan, a shallow and significant Magnitude 5.1 earthquake occurred in the early morning of Wednesday February 7th, 2024.

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Earthquake Summary

This earthquake hit under water in the Sea of Japan, 31 kilometers (19 mi) off the coast of Japan, 90 kilometer northwest of Jōetsu in Niigata. The center of this earthquake had a very shallow depth of 6 km. Shallow earthquakes usually have a larger impact than earthquakes deep in the earth.

Date and Time: Feb 7, 2024 06:08 (Tokyo Time)
- Feb 6, 2024 21:08 Universal Time.
Location: 90 km NW of Jōetsu, Niigata, Japan.
Coordinates 37°43'26"N 137°31'29"E.
Map: Map of area around epicenter.
Map of area around epicenter. Click to open in Google Maps.
Magnitude: MAG 5.1
Detected by 14 stations. Maximum Error Range ±0.083 .
Depth: 6 km (3 mi)
A very shallow depth.
Tsunami Risk: Low tsunami risk
Earthquakes under MAG-6.5 do not usually cause tsunami's.
Always stay cautious - More info here.

Nearby towns and cities

This earthquake may have been felt in Japan . Located 78 kilometer (48 mi) north-east of the epicenter of this earthquake, Anamizu (Ishikawa, Japan) is the nearest significant population center.

Major cities near this earthquake: Tokyo is located 297 km to the south-east. Nagoya is located 288 km to the south. Niigata is located 131 km to the east.

The table below provides an overview of all places in proximity of today's earthquake.

Overview of nearby places

Distance Place
78 km (48 mi)
SW from epicenter
Anamizu

Ishikawa, Japan.
82 km (51 mi)
SSE from epicenter
Itoigawa

Niigata, Japan.
87 km (54 mi)
S from epicenter
Nyūzen

Toyama, Japan.
89 km (55 mi)
ENE from epicenter
Ryōtsu-minato

Niigata, Japan.
90 km (56 mi)
SE from epicenter
Jōetsu

Niigata, Japan.
90 km (56 mi)
SSW from epicenter
Nanao

Ishikawa, Japan.
92 km (57 mi)
S from epicenter
Kurobe-shi

Toyama, Japan.
99 km (62 mi)
ESE from epicenter
Kashiwazaki

Niigata, Japan.
102 km (63 mi)
SE from epicenter
Arai

Niigata, Japan.
103 km (64 mi)
S from epicenter
Uozu

Toyama, Japan.
108 km (67 mi)
SSW from epicenter
Himimachi

Toyama, Japan.
108 km (67 mi)
S from epicenter
Namerikawa

Toyama, Japan.
112 km (70 mi)
SSW from epicenter
Nishishinminato

Toyama, Japan.
117 km (73 mi)
SSW from epicenter
Toyama

Toyama, Japan.
117 km (73 mi)
SSW from epicenter
Takaoka

Toyama, Japan.
119 km (74 mi)
E from epicenter
Maki

Niigata, Japan.
121 km (75 mi)
ESE from epicenter
Nagaoka

Niigata, Japan.
122 km (76 mi)
ESE from epicenter
Ojiya

Niigata, Japan.
123 km (76 mi)
E from epicenter
Tsubame

Niigata, Japan.
126 km (78 mi)
E from epicenter
Sanjō

Niigata, Japan.
126 km (78 mi)
E from epicenter
Mitsuke

Niigata, Japan.
128 km (80 mi)
ESE from epicenter
Tōkamachi

Niigata, Japan.
131 km (81 mi)
SE from epicenter
Nakano

Nagano, Japan.
131 km (81 mi)
E from epicenter
Niigata

Niigata, Japan.
132 km (82 mi)
E from epicenter
Shirone

Niigata, Japan.
133 km (83 mi)
SSE from epicenter
Nagano

Nagano, Japan.
136 km (85 mi)
SSW from epicenter
Tsubata

Ishikawa, Japan.
138 km (86 mi)
SSE from epicenter
Suzaka

Nagano, Japan.
139 km (86 mi)
SSW from epicenter
Nanto-shi

Toyama, Japan.
141 km (88 mi)
E from epicenter
Niitsu-honchō

Niigata, Japan.
149 km (93 mi)
SSW from epicenter
Kanazawa

Ishikawa, Japan.
155 km (96 mi)
SSW from epicenter
Nonoichi

Ishikawa, Japan.
159 km (99 mi)
SSW from epicenter
Matsutō

Ishikawa, Japan.
161 km (100 mi)
E from epicenter
Shibata

Niigata, Japan.
162 km (101 mi)
SSE from epicenter
Ueda

Nagano, Japan.
170 km (106 mi)
SSE from epicenter
Matsumoto

Nagano, Japan.
175 km (109 mi)
SSW from epicenter
Komatsu

Ishikawa, Japan.
179 km (111 mi)
S from epicenter
Takayama

Gifu, Japan.
202 km (126 mi)
SE from epicenter
Maebashi

Gunma, Japan.
204 km (127 mi)
SE from epicenter
Takasaki

Gunma, Japan.
218 km (135 mi)
SSW from epicenter
Fukui-shi

Fukui, Japan.
245 km (152 mi)
ESE from epicenter
Utsunomiya

Tochigi, Japan.
247 km (153 mi)
SSE from epicenter
Kōfu

Yamanashi, Japan.
255 km (158 mi)
ENE from epicenter
Yamagata

Yamagata, Japan.
255 km (158 mi)
E from epicenter
Kōriyama

Fukushima, Japan.
265 km (165 mi)
SSW from epicenter
Gifu-shi

Gifu, Japan.
267 km (166 mi)
SE from epicenter
Kawagoe

Saitama, Japan.
277 km (172 mi)
SE from epicenter
Saitama

Saitama, Japan.
280 km (174 mi)
SE from epicenter
Hachiōji

Tokyo, Japan.
285 km (177 mi)
SE from epicenter
Tsukuba

Ibaraki, Japan.
288 km (179 mi)
S from epicenter
Nagoya

Aichi, Japan.
289 km (180 mi)
SE from epicenter
Kawaguchi

Saitama, Japan.
295 km (183 mi)
SSE from epicenter
Fujinomiya

Shizuoka, Japan.
297 km (185 mi)
SE from epicenter
Tokyo

Tokyo, Japan.
297 km (185 mi)
SE from epicenter
Nagareyama

Chiba, Japan.
298 km (185 mi)
SSW from epicenter
Hikone

Shiga, Japan.
299 km (186 mi)
ENE from epicenter
Sendai

Miyagi, Japan.
299 km (186 mi)
SE from epicenter
Zama

Kanagawa, Japan.
Cities and Towns around the epicenter of this earthquake.

Shaking reported by 7 people

People that feel an earthquake may report their experience to the US Geographic Survey. Currently, 7 people have reported shaking in 6 places, all within Japan.We keep updating this article as more ground reports become available. You may report that you felt this earthquake here.

Places with most reports:

  • Niigata, Niigata, Japan: 2 people.
  • Kanazawa, Ishikawa, Japan: 1 person.
  • Iiyama, Nagano, Japan: 1 person.
  • Matsumoto, Nagano, Japan: 1 person.
  • Omachi, Nagano, Japan: 1 person.
  • Itoigawa, Niigata, Japan: 1 person.

Aftershocks detected

Since this main shock, 1 smaller aftershock was detected. Just 3 days after this main shock, an earthquake measuring MAG-4 was detected 18 km (11 mi) southwest of this earthquake.

This main shock was prefaced by 2 smaller foreshocks. Roughly 18 hrs before this earthquake, a foreshock measuring MAG-4 was detected nearby this earthquake.

Overview of foreshocks and aftershocks

Classification Magnitude When Where
Foreshock M 3.6 3 days earlier
Feb 4, 2024 06:43 (Tokyo Time)
93 km (58 mi)
SW from Main Shock.
Foreshock M 4.0 18 hrs earlier
Feb 6, 2024 11:56 (Tokyo Time)
80 km (50 mi)
SW from Main Shock.
Main Shock
This Earthquake
M 5.1 Feb 7, 2024 06:08
(Tokyo Time)
-
Aftershock M 4.0 3 days later
Feb 10, 2024 05:18 (Tokyo Time)
18 km (11 mi)
SW from Main Shock.
Detected MAG2.5+ earthquakes within within 100km (62 mi), that occurred in the three days before and after the main shock.

More earthquakes coming?

Aftershocks are usually at least 1 order of magnitude less strong than main shocks. The more time passes, the smaller the chance and likely strength of any potential aftershocks.

It's always adviced to be cautious of the risk of a larger shock following any significant earthquake, however this risk is fairly small. There is a roughly 94 percent change that no larger main shock will follow in the days following this earthquake.

Read: How to Stay Safe during an Earthquake (cdc.gov).

Earthquakes like this happen often in the region

Earthquakes of this strength are very common in the region. This is the strongest earthquake to hit since January 9th, 2024, when a 5.9 magnitude earthquake hit 28 km (17 mi) further north-east. An even stronger magnitude 7.5 earthquake struck on January 1st, 2024.

In total, 27 earthquakes with a magnitude of 5.1 or higher have been registered within 300km (186 mi) of this epicenter in the past 10 years. This comes down to an average of once every 5 months.

Low tsunami risk

DISCLAIMER: We strongly suggest to closely monitor advice from local authorities with regards to tsunami risks. Our analysis is based on automatically collected data from external sources, and these might contain mistakes. In addition, earthquakes can cause landslides that may lead to a tsunami, or be a followed by another, potentially stonger, earthquake.

Based on early data it appears this earthquake was not strong enough (lower than MAG-6.5) to be likely to cause destructive tsunami's. However this earthquake appeared to have hit at a shallow depth under sea, so stay cautious and monitor advice from local authorities.

Tsunami Risk Factors

Factor Under Sea? MAG-6.5 or stronger? Shallow depth?
Explanation Almost all tsunami's are caused by earthquakes with their epicenter under sea or very near the sea. However stay cautious in coastal areas as earthquakes on land may cause landslides into sea, potentially still causing a local tsunami. Under MAG 6.5: Very unlikely to cause a tsunami.
MAG 6.5 to 7.5: Destructive tsunami's do occur, but are uncommon. Likely to observe small sea level changes.
MAG 7.6+: Earthquakes with these magnitudes might produce destructive tsunami's.
Most destructive tsunami's are caused by shallow earthquakes with a depth between 0 and 100km under the surface of the earth. Deeper tsunami's are unlikely to displace to ocean floor.
This Earthquake This earthquake appears to have struck under the sea. Not this earthquake.
This earthquake had a magnitude of 5.1. Earthquakes of this strength are unlikely to trigger a tsunami.
This earthquake occurred at a depth of of 6 km (3 mi). Earthquakes this shallow could trigger a tsunami.

Sources

Last updated 02/03/24 23:48 (). As more information on this earthquake becomes available this article will be updated. This article is automatically composed based on data originating from multiple sources.

  1. US Geographic Society (USGS): Earthquake us7000lxe4
  2. European-Mediterranean Seismological Centre (EMSC): Earthquake 20240206_0000263
  3. Geonames.org: World Cities Database
  4. Google Maps: Static API
  5. Earthquakelist.org: Historic Earthquakes Database

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