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Light earthquake, 4.6 mag was detected near Onagawa Chō in Japan

Posted by admin on December 16, 2025 0 Comments

Earthquake location 38.6803S, 141.8751WA light earthquake magnitude 4.6 (ml/mb) strikes 45 kilometers (28 miles) from Onagawa Chō in Japan on Tuesday. The epicenter of the earthquake was roughly 84.608 km (53 miles) below the earth’s surface. Id of earthquake: us6000rv70. Event ids that are associated: us6000rv70. Date and time of earthquake in UTC/GMT: 16/12/25 / 2025-12-16 02:45:35 / December 16, 2025 @ 2:45 am. Exact location, longitude 141.8751° East, latitude 38.6803° North, depth = 84.608 km. The 4.6-magnitude earthquake has occurred at 02:45:35 / 2:45 am (local time epicenter). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist).

Nearby country/countries, Japan (c. 127 288 000 pop) (That might be effected). Nearest cities/city/towns to hypocenter/epicentrum was Kitakami, Tomiya, Yamada (min 5000 pop). The epicenter was 58 km (36 miles) from Ishinomaki (c. 117 200 pop), 94 km (58 miles) from Kitakami (c. 93 900 pop), 81 km (50 miles) from Furukawa (c. 76 300 pop), 69 km (43 miles) from Ichinoseki (c. 63 000 pop), 82 km (51 miles) from Mizusawa (c. 61 300 pop), 84 km (52 miles) from Shiogama (c. 59 500 pop), 66 km (41 miles) from Kamaishi (c. 43 100 pop).

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 four and in the last 365 days fifty-six earthquakes of magnitude 3.0 or greater that have been detected nearby. There are an estimated 13,000 light earthquakes in the world each year.

Questions or comments?

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: 45 km NE of Onagawa Chō, Japan.

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More information

Parameter Value Description
Magnitude 4.6 mb The magnitude for the event.
Longitude 141.8751° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 38.6803° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 84.608 km Depth of the event in kilometers.
Place 45 km NE 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 2025-12-16 02:45:35 Time when the event occurred. UTC/GMT
Updated 2025-12-16 02:59:39 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 326 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 39 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 2.197 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.99 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 123 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 us6000rv70 Id of event.
Event Code 6000rv70 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us6000rv70, A comma-separated list of event ids that are associated to an event.

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