Light earthquake, 4.6 mag has occurred near Koshima in Japan

A light earthquake with magnitude 4.6 (ml/mb) was reported 151 km SE of Koshima, Japan (94 miles) on Saturday. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The 4.6-magnitude earthquake was detected at 17:19:22 / 5:19 pm (local time epicenter). Date and time of earthquake in UTC/GMT: 18/10/25 / 2025-10-18 17:19:22 / October 18, 2025 @ 5:19 pm. Event id: us6000ri1w. Ids that are associated to the earthquake: us6000ri1w. The earthquake occurred at a depth of 10 km (6 miles) below the earth’s surface. Exact location of event, depth 10 km, 131.7393° East, 29.3532° North.

Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage. In the past 24 hours, there have been one, in the last 10 days one, in the past 30 days one and in the last 365 days thirteen earthquakes of magnitude 3.0 or greater that have been detected in the same area. There are an estimated 13,000 light quakes in the world each year.

Did you feel it?

What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity at your home, city and country. Read more about the earthquake, Location, Distances, Seismometer information, Date-Time, Parameters and details about this quake, reported near: 151 km SE of Koshima, Japan. This information comes from the USGS Earthquake Notification Service.

Japan Koshima

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Parameter	Value	Description
Magnitude	4.6 mb	The magnitude for the event.
Longitude	131.7393° East	Decimal degrees longitude. Negative values for western longitudes.
Latitude	29.3532° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	10 km	Depth of the event in kilometers.
Place	151 km SE of Koshima, Japan	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-10-18 17:19:22	Time when the event occurred. UTC/GMT
Updated	2025-10-21 17:14:20	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	326	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	88	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	2.419	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.48 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	67	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	us6000ri1w	Id of event.
Event Code	6000ri1w	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us6000ri1w,	A comma-separated list of event ids that are associated to an event.

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Light earthquake, 4.6 mag has occurred near Koshima in Japan

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