Light earthquake: M4.4 quake has struck near Iwaki in Japan

A light earthquake magnitude 4.4 (ml/mb) has struck on Wednesday, 139 km ESE of Iwaki, Japan (86 miles). Event ids that are associated to the earthquake: us7000pudy. Id of event: us7000pudy. The temblor was detected at 02:25:28 / 2:25 am (local time epicenter). Exact location, longitude 142.355° East, latitude 36.6172° North, depth = 34.783 km. The earthquake occurred at a depth of 34.783 km (22 miles). Exact time and date of earthquake 23/04/25 / 2025-04-23 02:25:28 / April 23, 2025 @ 2:25 am UTC/GMT. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist).

Each year there are an estimated 13,000 light earthquakes in the world. 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 twenty-nine earthquakes of magnitude 3.0 or greater that has occurred nearby. Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage.

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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. Read more about the earthquake, Distances, Seismometer information, Date-Time, Parameters, Location and details about this quake, that has struck: 139 km ESE of Iwaki, Japan. This data comes from the USGS Earthquake Notification Service.

Iwaki Japan

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Parameter	Value	Description
Magnitude	4.4 mb	The magnitude for the event.
Longitude	142.355° East	Decimal degrees longitude. Negative values for western longitudes.
Latitude	36.6172° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	34.783 km	Depth of the event in kilometers.
Place	139 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	2025-04-23 02:25:28	Time when the event occurred. UTC/GMT
Updated	2025-04-23 02:42:22	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	298	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	37	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	3.341	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.98 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	us7000pudy	Id of event.
Event Code	7000pudy	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us7000pudy,	A comma-separated list of event ids that are associated to an event.

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Light earthquake: M4.4 quake has struck near Iwaki in Japan

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