Written by on . Last updated July 18th, 2024.

In the North Pacific Ocean 7 kilometer from Katsuura, Japan, a significant MAG-5.1 earthquake occurred around noon of Thursday July 4th, 2024. The earthquake struck near a very densely populated region.

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Earthquake Summary

This earthquake hit under water in the North Pacific Ocean, right off the coast of Japan (2 mi offshore), 7 kilometer east-southeast of Katsuura in Chiba. The center of this earthquake had a quite shallow depth of 41 km. Shallow earthquakes usually have a larger impact than earthquakes deep in the earth.

Date and Time: Jul 4, 2024 12:12 (Tokyo Time)
- Jul 4, 2024 03:12 Universal Time.
Location: 7 km ESE of Katsuura, Chiba, Japan.
Coordinates 35°7'21"N 140°22'54"E.
Map: Map of area around epicenter.
Map of area around epicenter. Click to open in Google Maps.
Magnitude: MAG 5.1
Detected by 10 stations. Maximum Error Range ±0.098 .
Depth: 41 km (25 mi)
A quite 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 . The closest significant population center near the earthquake is Katsuura in Chiba, Japan. Katsuura is located 7 kilometer (4 mi) east-southeast of the epicenter.

Multiple major population centers exist within 300km of the earthquake that struck today. Tokyo is located 89 km to the northwest. Yokohama is located 75 km to the west-northwest. Kawasaki is located 75 km to the northwest.

An overview of nearby towns and cities is available in the overview below.

Overview of nearby places

Distance Place
7 km (4 mi)
WNW from epicenter
Katsuura

Chiba, Japan.
14 km (9 mi)
N from epicenter
Ōhara

Chiba, Japan.
26 km (16 mi)
W from epicenter
Kamogawa

Chiba, Japan.
35 km (22 mi)
NNW from epicenter
Mobara

Chiba, Japan.
44 km (27 mi)
N from epicenter
Ōami

Chiba, Japan.
48 km (30 mi)
N from epicenter
Tōgane

Chiba, Japan.
49 km (30 mi)
WSW from epicenter
Tateyama

Chiba, Japan.
50 km (31 mi)
NW from epicenter
Kisarazu

Chiba, Japan.
52 km (32 mi)
NNW from epicenter
Ichihara

Chiba, Japan.
53 km (33 mi)
N from epicenter
Narutō

Chiba, Japan.
53 km (33 mi)
WNW from epicenter
Kimitsu

Chiba, Japan.
55 km (34 mi)
WNW from epicenter
Futtsu

Chiba, Japan.
58 km (36 mi)
NNW from epicenter
Chiba

Chiba, Japan.
59 km (37 mi)
N from epicenter
Yachimata

Chiba, Japan.
62 km (39 mi)
NNW from epicenter
Yotsukaidō

Chiba, Japan.
67 km (42 mi)
WNW from epicenter
Yokosuka

Kanagawa, Japan.
67 km (42 mi)
NNW from epicenter
Sakura

Chiba, Japan.
69 km (43 mi)
W from epicenter
Miura

Kanagawa, Japan.
74 km (46 mi)
NNW from epicenter
Honchō

Chiba, Japan.
74 km (46 mi)
N from epicenter
Narita

Chiba, Japan.
75 km (47 mi)
WNW from epicenter
Yokohama

Kanagawa, Japan.
75 km (47 mi)
NW from epicenter
Kawasaki

Kanagawa, Japan.
75 km (47 mi)
WNW from epicenter
Zushi

Kanagawa, Japan.
76 km (47 mi)
NW from epicenter
Urayasu

Tokyo, Japan.
78 km (48 mi)
WNW from epicenter
Kamakura

Kanagawa, Japan.
81 km (50 mi)
NNW from epicenter
Shiroi

Chiba, Japan.
85 km (53 mi)
NNW from epicenter
Matsudo

Chiba, Japan.
86 km (53 mi)
WNW from epicenter
Fujisawa

Kanagawa, Japan.
87 km (54 mi)
N from epicenter
Katori-shi

Chiba, Japan.
88 km (55 mi)
NNW from epicenter
Ryūgasaki

Ibaraki, Japan.
89 km (55 mi)
NNW from epicenter
Abiko

Chiba, Japan.
89 km (55 mi)
NW from epicenter
Tokyo

Tokyo, Japan.
90 km (56 mi)
NNW from epicenter
Kashiwa

Chiba, Japan.
91 km (57 mi)
NNW from epicenter
Toride

Ibaraki, Japan.
92 km (57 mi)
NNW from epicenter
Yashio

Saitama, Japan.
92 km (57 mi)
NNW from epicenter
Nagareyama

Chiba, Japan.
92 km (57 mi)
WNW from epicenter
Chigasaki

Kanagawa, Japan.
95 km (59 mi)
WNW from epicenter
Minamirinkan

Kanagawa, Japan.
95 km (59 mi)
NW from epicenter
Sōka

Saitama, Japan.
96 km (60 mi)
WNW from epicenter
Machida

Tokyo, Japan.
96 km (60 mi)
NW from epicenter
Chōfu

Tokyo, Japan.
97 km (60 mi)
NW from epicenter
Kawaguchi

Saitama, Japan.
97 km (60 mi)
NNW from epicenter
Ushiku

Ibaraki, Japan.
98 km (61 mi)
WNW from epicenter
Hiratsuka

Kanagawa, Japan.
98 km (61 mi)
NW from epicenter
Kamirenjaku

Tokyo, Japan.
99 km (62 mi)
WNW from epicenter
Zama

Kanagawa, Japan.
99 km (62 mi)
NW from epicenter
Musashino

Tokyo, Japan.
99 km (62 mi)
WNW from epicenter
Atsugi

Kanagawa, Japan.
100 km (62 mi)
NW from epicenter
Shimotoda

Saitama, Japan.
109 km (68 mi)
NW from epicenter
Saitama

Saitama, Japan.
113 km (70 mi)
WNW from epicenter
Hachiōji

Tokyo, Japan.
167 km (104 mi)
NNW from epicenter
Utsunomiya

Tochigi, Japan.
175 km (109 mi)
WNW from epicenter
Kōfu

Yamanashi, Japan.
183 km (114 mi)
W from epicenter
Shizuoka

Shizuoka, Japan.
184 km (114 mi)
NW from epicenter
Maebashi

Gunma, Japan.
219 km (136 mi)
N from epicenter
Iwaki

Fukushima, Japan.
261 km (162 mi)
NW from epicenter
Nagano

Nagano, Japan.
276 km (171 mi)
W from epicenter
Toyohashi

Aichi, Japan.
296 km (184 mi)
NW from epicenter
Jōetsu

Niigata, Japan.
296 km (184 mi)
W from epicenter
Tajimi

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

Shaking reported by 15 people

People that feel an earthquake may report their experience to the US Geographic Survey. Currently, 15 people have reported shaking in 11 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: 4 people.
  • Fujisawa, Kanagawa, Japan: 2 people.
  • Kamagaya, Chiba, Japan: 1 person.
  • Shisui, Chiba, Japan: 1 person.
  • Ayase, Kanagawa, Japan: 1 person.
  • Hayama, Kanagawa, Japan: 1 person.
  • Yokosuka, Kanagawa, Japan: 1 person.
  • Zushi, Kanagawa, Japan: 1 person.
  • Fuji, Shizuoka, Japan: 1 person.
  • Komae, Tokio, Japan: 1 person.

Aftershocks detected

Since this main shock, 1 smaller aftershock was detected. Just 2 days after this main shock, an earthquake measuring MAG-3.5 was detected 89 km (55 mi) north-northeast of this earthquake.

Overview of foreshocks and aftershocks

Classification Magnitude When Where
Main Shock
This Earthquake
M 5.1 Jul 4, 2024 12:12
(Tokyo Time)
-
Aftershock M 3.5 2 days later
Jul 6, 2024 07:53 (Tokyo Time)
89 km (55 mi)
NNE 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.

In only six percent of cases, significant earthquakes are followed by a larger main shock, making the current earthquake a foreshock. While the chance of this happening is not so large, it is adviced to maintain cautiousness in the hours and days following a major 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 June 25th, 2024, when a 5.4 magnitude earthquake hit 200 km (124 mi) further south-southeast. An even stronger magnitude 6.9 earthquake struck on November 21st, 2016.

In total, 116 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 month.

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 41 km (25 mi). Earthquakes this shallow could trigger a tsunami.

Sources

Last updated 18/07/24 03:58 (). 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 us7000mwzq
  2. European-Mediterranean Seismological Centre (EMSC): Earthquake 20240704_0000031
  3. Geonames.org: World Cities Database
  4. Google Maps: Static API
  5. Earthquakelist.org: Historic Earthquakes Database

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