Light earthquake, 4.2 mag has occurred near Iwaki in Japan

A light earthquake magnitude 4.2 (ml/mb) strikes 66 kilometers (41 miles) from Iwaki in Japan on Monday. Exact time and date of event in UTC/GMT: 15/09/25 / 2025-09-15 08:43:13 / September 15, 2025 @ 8:43 am. Exact location, longitude 141.6126° East, latitude 36.9108° North, depth = 35 km. Event ids that are associated to the earthquake: us6000rfmp. Id of event: us6000rfmp. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The temblor was picked up at 08:43:13 / 8:43 am (local time epicenter). The epicenter was at a depth of 35 km (22 miles).

Nearest cities/city/villages to epicentrum/hypocenter was Hitachi, Namie, Takahagi (min 5000 pop). Close country/countries, Japan (c. 127 288 000 pop) (That might be effected). Epicenter of the earthquake was 67 km (41 miles) from Iwaki (c. 357 300 pop), 92 km (57 miles) from Hitachi (c. 186 300 pop), 78 km (49 miles) from Kitaibaraki (c. 50 800 pop), 83 km (51 miles) from Takahagi (c. 33 600 pop), 84 km (52 miles) from Namie (c. 21 900 pop).

Each year there are an estimated 13,000 light quakes in the world. In the past 24 hours, there have been five, in the last 10 days seven, in the past 30 days ten and in the last 365 days sixty-one earthquakes of magnitude 3.0 or greater that was reported nearby. Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage.

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What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity at your home, city and country. Read more about the earthquake, Distances, Seismometer information, Date-Time, Parameters, Location and details about this quake, that has struck: 66 km ESE of Iwaki, Japan. This data comes from the USGS Earthquake Notification Service.

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Parameter	Value	Description
Magnitude	4.2 mb	The magnitude for the event.
Longitude	141.6126° East	Decimal degrees longitude. Negative values for western longitudes.
Latitude	36.9108° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	35 km	Depth of the event in kilometers.
Place	66 km ESE of Iwaki, Japan	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-09-15 08:43:13	Time when the event occurred. UTC/GMT
Updated	2025-10-14 13:22:55	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	271	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	27	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	2.759	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	1.03 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	143	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	us6000rfmp	Id of event.
Event Code	6000rfmp	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us6000rfmp,	A comma-separated list of event ids that are associated to an event.

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Light earthquake, 4.2 mag has occurred near Iwaki in Japan

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