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Light World Earthquakes Magnitude 4-4.9

Light earthquake 4.1 mag, 20 km NE of Imabetsu, Japan


Earthquake location 41.2934S, 140.6781WA light earthquake magnitude 4.1 (ml/mb) has struck on Tuesday, 20 kilometers (12 miles) from Imabetsu in Japan. Exact location of event, longitude 140.6781 East, latitude 41.2934 North, depth = 138.052 km. Unique identifier: us7000qrmp. Ids that are associated to the event: us7000qrmp. 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 138.052 km (86 miles) below the earth’s surface. The 4.1-magnitude earthquake has occurred at 06:17:40 / 6:17 am (local time epicenter). Exact time and date of event in UTC/GMT: 05/08/25 / 2025-08-05 06:17:40 / August 5, 2025 @ 6:17 am.

Nearby country/countries, Japan (c. 127 288 000 pop) (That might be effected). Epicenter of the event was 52 km (33 miles) from Aomori Shi (c. 298 400 pop), 54 km (33 miles) from Hakodate (c. 275 700 pop), 80 km (50 miles) from Hirosaki (c. 175 000 pop), 45 km (28 miles) from Mutsu (c. 49 200 pop), 58 km (36 miles) from Goshogawara (c. 49 100 pop), 90 km (56 miles) from Misawa (c. 42 800 pop). Nearest city/cities or towns, with min 5000 pop, to epicentrum/hypocenter was Misawa, Hirosaki, Kuroishi.

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

Did you feel the quake?

How did you react? Was there any damage to buildings? Leave a comment or report about shaking, activity and damage at your home, city and country. The information in this article comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Distances, Parameters, Date-Time, Location and details about this quake, detected near: 20 km NE of Imabetsu, Japan.

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More information

Parameter Value Description
Magnitude 4.1 mb The magnitude for the event.
Longitude 140.6781° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 41.2934° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 138.052 km Depth of the event in kilometers.
Place 20 km NE of Imabetsu, Japan Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2025-08-05 06:17:40 Time when the event occurred. UTC/GMT
Updated 2025-08-31 12:12:11 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 259 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 34 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 0.582 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.63 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 81 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 us7000qrmp Id of event.
Event Code 7000qrmp An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us7000qrmp, A comma-separated list of event ids that are associated to an event.

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