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Light earthquake: M4.5 quake has struck near Tomioka in Japan


Earthquake location 37.4464S, 141.6208WA light earthquake with magnitude 4.5 (ml/mb) was detected on Monday, 54 kilometers (34 miles) from Tomioka in Japan. Global time and date of event 21/04/25 / 2025-04-21 16:48:06 / April 21, 2025 @ 4:48 pm UTC/GMT. All ids that are associated to the event: us7000pu18. Unique identifier: us7000pu18. The earthquake occurred at a depth of 44.978 km (28 miles) below the earth’s surface. Exact location of earthquake, longitude 141.6208 East, latitude 37.4464 North, depth = 44.978 km. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The 4.5-magnitude earthquake was detected at 16:48:06 / 4:48 pm (local time epicenter).

Epicenter of the event was 79 km (49 miles) from Iwaki (c. 357 300 pop), 94 km (58 miles) from Watari (c. 36 300 pop), 95 km (59 miles) from Kakuda (c. 33 200 pop), 92 km (57 miles) from Funehikimachi-funehiki (c. 23 500 pop), 55 km (34 miles) from Namie (c. 21 900 pop), 92 km (57 miles) from Marumori (c. 16 800 pop). Country/countries that might be effected, Japan (c. 127 288 000 pop). Nearest cities/city/villages to epicentrum/hypocenter was Kakuda, Watari, Funehikimachi-funehiki (min 5000 pop).

Each 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. In the past 24 hours, there have been one, in the last 10 days one, in the past 30 days five and in the last 365 days fifty-two earthquakes of magnitude 3.0 or greater that has struck near.

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: 54 km ENE of Tomioka, Japan. This data comes from the USGS Earthquake Notification Service.

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More information

Parameter Value Description
Magnitude 4.5 mb The magnitude for the event.
Longitude 141.6208° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 37.4464° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 44.978 km Depth of the event in kilometers.
Place 54 km ENE of Tomioka, Japan Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2025-04-21 16:48:06 Time when the event occurred. UTC/GMT
Updated 2025-04-21 17:39:21 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 312 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 84 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 2.877 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.9 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 94 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 us7000pu18 Id of event.
Event Code 7000pu18 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us7000pu18, A comma-separated list of event ids that are associated to an event.

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