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Strong earthquake: M6 quake has struck near Tomioka in Japan

Posted by admin on October 4, 2025 0 Comments

Earthquake location 37.3867S, 141.6529WA earthquake with magnitude 6 (ml/mb) was detected on Saturday, 56 kilometers (35 miles) from Tomioka in Japan. Date and time of earthquake in UTC/GMT: 04/10/25 / 2025-10-04 15:21:09 / October 4, 2025 @ 3:21 pm. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). All ids that are associated to the event: us6000resn. Unique identifier: us6000resn. Exact location of earthquake, longitude 141.6529 East, latitude 37.3867 North, depth = 46.754 km. The 6-magnitude earthquake has occurred at 15:21:09 / 3:21 pm (local time epicenter). The earthquake occurred at a depth of 46.754 km (29 miles).

Nearest cities/city/villages to epicentrum/hypocenter was Yamoto, Matsushima, Rifu (min 5000 pop). Event epicenter was 120 km (74 miles) from Sendai-shi (c. 1 063 100 pop), 119 km (74 miles) from Sendai (c. 1 063 100 pop), 78 km (48 miles) from Iwaki (c. 357 300 pop), 112 km (70 miles) from Kōriyama (c. 340 600 pop), 112 km (70 miles) from Fukushima-shi (c. 294 200 pop), 119 km (74 miles) from Ishinomaki (c. 117 200 pop), 113 km (70 miles) from Sukagawa (c. 68 800 pop), 117 km (73 miles) from Shiogama (c. 59 500 pop). Nearby country/countries that might be effected, Japan (c. 127 288 000 pop).

In the past 24 hours, there have been one, in the last 10 days one, in the past 30 days two and in the last 365 days fifty earthquakes of magnitude 3.0 or greater that have been detected in the same area. Every year there are an estimated 135 earthquakes in the world. Earthquakes 6.0 to 6.9 may cause a lot of damage in very populated areas.

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. 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: 56 km E of Tomioka, Japan.

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More information

Parameter Value Description
Magnitude 6 mb The magnitude for the event.
Longitude 141.6529° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 37.3867° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 46.754 km Depth of the event in kilometers.
Place 56 km E 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 2025-10-04 15:21:09 Time when the event occurred. UTC/GMT
Updated 2025-10-04 15:45:40 Time when the event was most recently updated. UTC/GMT
Timezone offset Timezone offset from UTC in minutes at the event epicenter.
Felt 1 The total number of felt reports
CDI 3.1 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 554 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 127 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 2.884 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.77 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 49 The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type mww The method or algorithm used to calculate the preferred magnitude for the event.
Event Type earthquake Type of seismic event.
Event ID us6000resn Id of event.
Event Code 6000resn An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us6000resn, A comma-separated list of event ids that are associated to an event.

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