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Light earthquake, 4.1 mag has occurred near Onagawa Chō in Japan

Posted by admin on October 27, 2025 0 Comments

Earthquake location 37.8765S, 144.2519WA light earthquake magnitude 4.1 (ml/mb) has struck on Monday, 253 km ESE of Onagawa Chō, Japan (157 miles). Exact time and date of event in UTC/GMT: 29/09/25 / 2025-09-29 04:28:48 / September 29, 2025 @ 4:28 am. The 4.1-magnitude earthquake was detected at 04:28:48 / 4:28 am (local time epicenter). The epicenter of the earthquake was roughly 10 km (6 miles) below the earth’s surface. Event ids that are associated to the earthquake: us6000rigm. Id of event: us6000rigm. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Exact location of event, depth 10 km, 144.2519° East, 37.8765° North.

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

Did you feel it?

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. 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: 253 km ESE of Onagawa Chō, Japan.

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More information

Parameter Value Description
Magnitude 4.1 mb The magnitude for the event.
Longitude 144.2519° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 37.8765° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 10 km Depth of the event in kilometers.
Place 253 km ESE of Onagawa Chō, Japan Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2025-09-29 04:28:48 Time when the event occurred. UTC/GMT
Updated 2025-10-27 03:26:29 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 12 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 3.817 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.6 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 201 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 us6000rigm Id of event.
Event Code 6000rigm An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us6000rigm, A comma-separated list of event ids that are associated to an event.

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