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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.2 mag strikes near Ōma in Japan


Earthquake location 41.7453S, 141.3621WA light earthquake with magnitude 4.2 (ml/mb) was reported 44 kilometers (27 miles) from Ōma in Japan on Saturday. The earthquake occurred at a depth of 122.029 km (76 miles) below the earth’s surface. Exact location, longitude 141.3621° East, latitude 41.7453° North, depth = 122.029 km. Global date and time of event UTC/GMT: 04/10/25 / 2025-10-04 04:47:26 / October 4, 2025 @ 4:47 am. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The 4.2-magnitude earthquake has occurred at 04:47:26 / 4:47 am (local time epicenter). Event ids that are associated to the earthquake: us6000rj6c. Id of event: us6000rj6c.

Close country/countries that might be effected, Japan (c. 127 288 000 pop). Nearest cities/city/towns to hypocenter/epicentrum was Date, Shiraoi, Muroran (min 5000 pop). Earthquake epicenter was 52 km (32 miles) from Hakodate (c. 275 700 pop), 71 km (44 miles) from Muroran (c. 96 200 pop), 52 km (32 miles) from Mutsu (c. 49 200 pop), 60 km (37 miles) from Kamiiso (c. 38 100 pop), 90 km (56 miles) from Date (c. 35 300 pop), 58 km (36 miles) from Nanae (c. 30 000 pop).

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

How would you describe the shaking?

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, Distances, Seismometer information, Date-Time, Parameters, Location and details about this quake, that has struck: 44 km ENE of Ōma, Japan. This data comes from the USGS Earthquake Notification Service.

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More information

Parameter Value Description
Magnitude 4.2 mb The magnitude for the event.
Longitude 141.3621° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 41.7453° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 122.029 km Depth of the event in kilometers.
Place 44 km ENE of Ōma, Japan Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2025-10-04 04:47:26 Time when the event occurred. UTC/GMT
Updated 2025-10-25 02:09:48 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 271 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 31 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 0.981 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.7 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 115 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 us6000rj6c Id of event.
Event Code 6000rj6c An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us6000rj6c, A comma-separated list of event ids that are associated to an event.

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