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Light earthquake: M4.5 quake has struck near Iwaki in Japan

Posted by admin on October 31, 2025 0 Comments

A light earthquake with magnitude 4.5 (ml/mb) was reported 23 kilometers (14 miles) from Iwaki in Japan on Thursday. The 4.5-magnitude earthquake was detected at 08:00:56 / 8:00 am (local time epicenter). Exact location of event, depth 42.833 km, 141.1412° East, 37.0685° North. The epicenter was at a depth of 42.833 km (27 miles). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Date and time of earthquake in UTC/GMT: 30/10/25 / 2025-10-30 08:00:56 / October 30, 2025 @ 8:00 am. Unique identifier: us6000rkc1. Ids that are associated to the event: us6000rkc1.

Event epicenter was 23 km (14 miles) from Iwaki (c. 357 300 pop), 77 km (48 miles) from Kōriyama (c. 340 600 pop), 96 km (60 miles) from Fukushima-shi (c. 294 200 pop), 68 km (42 miles) from Hitachi (c. 186 300 pop), 92 km (57 miles) from Hitachi-Naka (c. 156 800 pop), 93 km (58 miles) from Katsuta (c. 156 000 pop), 71 km (44 miles) from Sukagawa (c. 68 800 pop). Nearest cities/city/towns to hypocenter/epicentrum was Fukushima-shi, Katsuta, Hitachi-Naka (min 5000 pop). Close country/countries that might be effected, Japan (c. 127 288 000 pop).

In the past 24 hours, there have been one, in the last 10 days two, in the past 30 days five and in the last 365 days fifty-nine earthquakes of magnitude 3.0 or greater that has occurred nearby. There are an estimated 13,000 light quakes in the world each year. Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage.

How would you describe the shaking?

What was your situation during the earthquake? Leave a comment or report about damage, shaking and activity 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: 23 km E of Iwaki, Japan.

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Parameter	Value	Description
Magnitude	4.5 mb	The magnitude for the event.
Longitude	141.1412° East	Decimal degrees longitude. Negative values for western longitudes.
Latitude	37.0685° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	42.833 km	Depth of the event in kilometers.
Place	23 km E 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	2025-10-30 08:00:56	Time when the event occurred. UTC/GMT
Updated	2025-10-31 04:36:39	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	312	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	56	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	2.411	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.6 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	142	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	us6000rkc1	Id of event.
Event Code	6000rkc1	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us6000rkc1,	A comma-separated list of event ids that are associated to an event.

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Light earthquake: M4.5 quake has struck near Iwaki in Japan

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