Light earthquake, 4.2 mag was detected near Iwaki in Japan

A light earthquake magnitude 4.2 (ml/mb) has occurred on Wednesday, 34 kilometers (21 miles) from Iwaki in Japan. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Global time and date of event 23/07/25 / 2025-07-23 03:13:50 / July 23, 2025 @ 3:13 am UTC/GMT. Unique identifier: us6000qym1. Ids that are associated to the event: us6000qym1. The 4.2-magnitude earthquake was detected at 03:13:50 / 3:13 am (local time epicenter). Exact location of earthquake, longitude 141.2539 East, latitude 36.9569 North, depth = 69.24 km. The earthquake was roughly at a depth of 69.24 km (43 miles).

Nearby country/countries that might be effected, Japan (c. 127 288 000 pop). Nearest city/cities or towns, with min 5000 pop, to epicentrum/hypocenter was Kōriyama, Katsuta, Hitachi-Naka. Earthquake epicenter was 34 km (21 miles) from Iwaki (c. 357 300 pop), 92 km (57 miles) from Kōriyama (c. 340 600 pop), 67 km (42 miles) from Hitachi (c. 186 300 pop), 89 km (56 miles) from Hitachi-Naka (c. 156 800 pop), 91 km (56 miles) from Katsuta (c. 156 000 pop), 85 km (53 miles) from Sukagawa (c. 68 800 pop).

Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage. Every year there are an estimated 13,000 light earthquakes in the world. In the past 24 hours, there have been two, in the last 10 days three, in the past 30 days six and in the last 365 days fifty-two earthquakes of magnitude 3.0 or greater that have been detected nearby.

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: 34 km ESE of Iwaki, Japan.

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Parameter	Value	Description
Magnitude	4.2 mb	The magnitude for the event.
Longitude	141.2539° East	Decimal degrees longitude. Negative values for western longitudes.
Latitude	36.9569° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	69.24 km	Depth of the event in kilometers.
Place	34 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	2025-07-23 03:13:50	Time when the event occurred. UTC/GMT
Updated	2025-08-07 00:54:02	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	19	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	2.48	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.69 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	172	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	us6000qym1	Id of event.
Event Code	6000qym1	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us6000qym1,	A comma-separated list of event ids that are associated to an event.

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Light earthquake, 4.2 mag was detected near Iwaki in Japan

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