Light earthquake, 4.3 mag strikes near Ichihara in Japan

Posted by admin on December 6, 2025 0 Comments

A light earthquake with magnitude 4.3 (ml/mb) was reported 7 kilometers (4 miles) from Ichihara in Japan on Thursday. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The epicenter of the earthquake was roughly 97.369 km (61 miles) below the earth’s surface. Exact location, longitude 140.0125° East, latitude 35.5524° North, depth = 97.369 km. The 4.3-magnitude earthquake has occurred at 21:36:20 / 9:36 pm (local time epicenter). Global date and time of event UTC/GMT: 13/11/25 / 2025-11-13 21:36:20 / November 13, 2025 @ 9:36 pm. All ids that are associated to the event: us7000rf34. Unique identifier: us7000rf34.

Close country/countries that might be effected, Japan (c. 127 288 000 pop). Epicenter of the event was 33 km (20 miles) from Tokyo (c. 8 336 600 pop), 35 km (22 miles) from Yokohama (c. 3 574 400 pop), 27 km (17 miles) from Kawasaki (c. 1 306 800 pop), 51 km (32 miles) from Saitama (c. 1 193 400 pop), 50 km (31 miles) from Yono (c. 1 077 700 pop), 12 km (7 miles) from Chiba (c. 919 700 pop). Closest city/cities/towns to epicentrum/hypocenter was Sano, Tomobe, Iwase (min 5000 pop).

In the past 24 hours, there have been one, in the last 10 days four, in the past 30 days six and in the last 365 days fifty-six earthquakes of magnitude 3.0 or greater that was reported nearby. Every year there are an estimated 13,000 light earthquakes in the world. Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage.

Did you feel the quake?

What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity at your home, city and country. This data comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Distances, Parameters, Date-Time, Location and details about this quake, that has occurred near: 7 km WNW of Ichihara, Japan.

More information

Parameter	Value	Description
Magnitude	4.3 mb	The magnitude for the event.
Longitude	140.0125° East	Decimal degrees longitude. Negative values for western longitudes.
Latitude	35.5524° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	97.369 km	Depth of the event in kilometers.
Place	7 km WNW of Ichihara, Japan	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-11-13 21:36:20	Time when the event occurred. UTC/GMT
Updated	2025-12-05 23:51:05	Time when the event was most recently updated. UTC/GMT
Timezone offset		Timezone offset from UTC in minutes at the event epicenter.
Felt		The total number of felt reports
CDI		The maximum reported intensity for the event.
MMI		The maximum estimated instrumental intensity for the event.
Alert Level		The alert level from the PAGER earthquake impact scale. Green, Yellow, Orange or Red.
Review Status	reviewed	Indicates whether the event has been reviewed by a human.
Tsunami	0	This flag is set to "1" for large events in oceanic regions and "0" otherwise. The existence or value of this flag does not indicate if a tsunami actually did or will exist.
SIG	284	A number describing how significant the event is. Larger numbers indicate a more significant event.
Network	us	The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources	,us,	A comma-separated list of network contributors.
Number of Stations Used	32	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	1.764	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.69 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	106	The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type	mb	The method or algorithm used to calculate the preferred magnitude for the event.
Event Type	earthquake	Type of seismic event.
Event ID	us7000rf34	Id of event.
Event Code	7000rf34	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us7000rf34,	A comma-separated list of event ids that are associated to an event.

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Light earthquake, 4.3 mag strikes near Ichihara in Japan

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