Significant M5.8 Earthquake struck on Friday Afternoon near Yōkaichiba in Japan.

Written by Earthquakelist.org on June 26th, 2026. Last updated August 12th, 2026.

A significant Magnitude 5.8 earthquake struck under land 3 kilometer from Yōkaichiba in Japan in the early afternoon of Friday June 26th, 2026. The earthquake struck near a very densely populated region. Shaking may have been felt by a total of 46 million people.

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Earthquake Summary

The earthquake struck on land in Japan, 3 kilometer (2 mi) east of Yōkaichiba in Chiba. The center of this earthquake had a quite shallow depth of 43 km. Shallow earthquakes usually have a larger impact than earthquakes deep in the earth.

Date and Time:	Jun 26, 2026 12:46 (Tokyo Time) - Jun 26, 2026 03:46 Universal Time.
Location:	3 km east of Yōkaichiba, Chiba, Japan. Coordinates 35°41'27"N 140°34'38"E.
Map:	Map of area around epicenter. Click to open in Google Maps.
Magnitude:	MAG 5.8 Detected by 37 stations. Maximum Error Range ±0.051 .
Depth:	43 km (27 mi) A quite shallow depth.
Max. Intensity:	V Moderate On the Modified Mercalli Scale.
Tsunami Risk:	Tsunami very unlikely While this was a shallow earthquake in a coastal area, it appears to have occurred under land (5 km from the sea) with a magnitude that is usually not strong enough to cause tsunami's. Always stay cautious - More info here.

Minimal impact predicted

Based on scientific estimates by the US Geographic Survey (USGS), the risk of high fatalities for this earthquake is classified at level GREEN (low). They expect an 90% likelyhood of between 0 and 1 fatalities.

The USGS classifies the economic impact of this earthquake at level GREEN (low). They expect an 90% likelyhood of between 0 and 1 million US Dollars in economic damage and impact.

Roughly 46 million people exposed to shaking

An estimated 46 million have been exposed to shaking (An MMI or Modified Mercalli Intensity level II or higher) as a result of this earthquake according scientific estimates published by the USGS.

Moderate shaking and very light damage may have been experienced by an estimated 104,800 people. At V, it is the highest MMI level this earthquake has caused. Intensity level IV was experienced by the majority of people (around 29 million). In their region, light shaking and likely no damage can be expected. All exposure to shaking was within the borders of Japan .

Nearby towns and cities

This earthquake may have been felt in Japan . The closest significant population center near the earthquake is Yōkaichiba in Chiba, Japan. Yōkaichiba is located 3 kilometer (2 mi) east of the epicenter. Yōkaichiba experienced an earthquake intensity (MMI Scale) of roughly IV. That level implies light shaking and likely no damage.

Major cities near this earthquake: Tokyo is located 80 km to the west and experienced an intensity of IV (light shaking, likely no damage). Yokohama is located 89 km to the west and experienced an intensity of III (weak shaking, probably no damage). Chiba is located 43 km to the west and experienced an intensity of IV (light shaking, likely no damage).

The table below provides an overview of all places in proximity of today's earthquake. Where available, the estimated intensity on the Modified Mercalli Intensity Scale in each place is included. Places where this information is omitted likely experienced little impact.

Overview of nearby places

Earthquake Intensity Map

The intensity in shaking and damage by this earthquake is illustrated through the map below. The highest intensity measured for this earthquake is V.

I Not felt

II Weak

III Weak

IV Light

V Moderate

VI Strong

VII Very Strong

VIII Severe

IX Violent

X Extreme

Shaking reported by 65 people

People that feel an earthquake may report their experience to the US Geographic Survey. Currently, 65 people have reported shaking in 27 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:

• Tokyo, Tokio, Japan: 25 people.
• Yokohama, Kanagawa, Japan: 6 people.
• Kawasaki, Kanagawa, Japan: 5 people.
• Yokosuka, Kanagawa, Japan: 3 people.
• Utsunomiya, Tochigi, Japan: 2 people.
• Naka, Ibaraki, Japan: 2 people.
• Urayasu, Chiba, Japan: 2 people.
• Yachimata, Chiba, Japan: 1 person.
• Inagi, Tokio, Japan: 1 person.
• Kokubunji, Tokio, Japan: 1 person.

8 Aftershocks detected

After this earthquake struck, 8 smaller aftershocks occurred. A 4.5 magnitude earthquake hit 14 mins later 26 km (16 mi) east of this earthquake.

In the days before this main shock, 1 smaller foreshock was detected. Nearby this earthquake a foreshock struck 58 mins earlier. It measured a magnitude of 4.5

Overview of foreshocks and aftershocks

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.

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 October 4th, 2025, when a 5.9 magnitude earthquake hit 211 km (131 mi) further north-east. An even stronger magnitude 7.3 earthquake struck on March 16th, 2022.

In total, 22 earthquakes with a magnitude of 5.8 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 6 months.

Tsunami very unlikely

While MAG-6.5+ earthquakes may cause tsunami's, it appears that the epicenter of this earthquake hit under land. In addition, the reported depth is deeper than 100km, making the risk of a tsunami even less likely. However always stay cautious and monitor advice from local authorities.

Tsunami Risk Factors

Sources

Last updated 12/08/26 04:18 (). This article is automatically generated based on available data. We keep checking multiple sources for additional information. This article gets updated as new details on this earthquake become available.

1. US Geographic Society (USGS): Earthquake us6000t8cy
2. European-Mediterranean Seismological Centre (EMSC): Earthquake 20260626_0000042
3. Geonames.org: World Cities Database
4. Google Maps: Static API
5. Earthquakelist.org: Historic Earthquakes Database

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