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Light earthquake: M4.6 quake has struck near Ōarai in Japan

Posted by admin on September 19, 2025 0 Comments

Earthquake location 36.1871S, 140.8626WA light earthquake magnitude 4.6 (ml/mb) strikes 28 kilometers (17 miles) from Ōarai in Japan on Friday. Event ids that are associated to the earthquake: us7000qxes. Id of event: us7000qxes. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Exact time and date of event in UTC/GMT: 19/09/25 / 2025-09-19 18:02:16 / September 19, 2025 @ 6:02 pm. The temblor was picked up at 18:02:16 / 6:02 pm (local time epicenter). Exact location of event, longitude 140.8626 East, latitude 36.1871 North, depth = 46.585 km. The earthquake was roughly at a depth of 46.585 km (29 miles).

Closest city/cities/towns to epicentrum/hypocenter was Yoshikawa, Matsudo, Ujiie (min 5000 pop). Nearby country/countries that might be effected, Japan (c. 127 288 000 pop). Event epicenter was 93 km (58 miles) from Chiba (c. 919 700 pop), 96 km (60 miles) from Funabashi (c. 560 700 pop), 98 km (61 miles) from Matsudo (c. 470 300 pop), 97 km (60 miles) from Utsunomiya-shi (c. 449 900 pop), 96 km (60 miles) from Iwaki (c. 357 300 pop), 88 km (55 miles) from Kashiwa (c. 340 200 pop), 41 km (26 miles) from Mito-shi (c. 246 500 pop).

There are an estimated 13,000 light earthquakes in the world each year. In the past 24 hours, there have been two, in the last 10 days two, in the past 30 days four and in the last 365 days sixty-eight 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.

Did you feel anything?

Did objects rattle, topple over, or fall off shelves? Leave a comment or report about activity, shaking and damage at your home, country and city. 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: 28 km ESE of Ōarai, Japan.

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More information

Parameter Value Description
Magnitude 4.6 mb The magnitude for the event.
Longitude 140.8626° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 36.1871° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 46.585 km Depth of the event in kilometers.
Place 28 km ESE of Ōarai, Japan Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2025-09-19 18:02:16 Time when the event occurred. UTC/GMT
Updated 2025-09-19 18:25:19 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 44 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 2.171 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.54 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 134 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 us7000qxes Id of event.
Event Code 7000qxes An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us7000qxes, A comma-separated list of event ids that are associated to an event.

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