Light earthquake, 4.6 mag strikes near Onagawa Chō in Japan

A light earthquake with magnitude 4.6 (ml/mb) was detected on Sunday, 63 kilometers (39 miles) from Onagawa Chō in Japan. All ids that are associated to the event: us7000pfjm. Unique identifier: us7000pfjm. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The temblor was picked up at 04:08:06 / 4:08 am (local time epicenter). Date and time of earthquake in UTC/GMT: 23/02/25 / 2025-02-23 04:08:06 / February 23, 2025 @ 4:08 am. Exact location of event, depth 62.635 km, 141.8471° East, 37.9731° North. The earthquake occurred at a depth of 62.635 km (39 miles) below the earth’s surface.

Close country/countries that might be effected, Japan (c. 127 288 000 pop). Closest city/cities or villages, with min 5000 pop, to hypocenter/epicentrum was Ōkawara, Tomiya, Marumori. Earthquake epicenter was 91 km (57 miles) from Sendai (c. 1 063 100 pop), 91 km (57 miles) from Sendai-shi (c. 1 063 100 pop), 69 km (43 miles) from Ishinomaki (c. 117 200 pop), 81 km (50 miles) from Shiogama (c. 59 500 pop), 96 km (60 miles) from Tomiya (c. 42 500 pop), 88 km (55 miles) from Iwanuma (c. 42 400 pop), 88 km (54 miles) from Watari (c. 36 300 pop).

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

Did you feel the quake?

Were you asleep? Was it difficult to stand and/or walk? Leave a comment or report about shaking, activity and damage at your city, home and country. This information comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Date-Time, Location, Distances, Parameters and details about this quake, recorded: 63 km SSE of Onagawa Chō, Japan.

More information

Parameter	Value	Description
Magnitude	4.6 mb	The magnitude for the event.
Longitude	141.8471° East	Decimal degrees longitude. Negative values for western longitudes.
Latitude	37.9731° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	62.635 km	Depth of the event in kilometers.
Place	63 km SSE of Onagawa Chō, Japan	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-02-23 04:08:06	Time when the event occurred. UTC/GMT
Updated	2025-02-23 04:44:40	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	62	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	2.877	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	1.01 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	102	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	us7000pfjm	Id of event.
Event Code	7000pfjm	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us7000pfjm,	A comma-separated list of event ids that are associated to an event.

Parameter

Value

Description

Magnitude

4.6 mb

The magnitude for the event.

Longitude

141.8471° East

Decimal degrees longitude. Negative values for western longitudes.

Latitude

37.9731° North

Decimal degrees latitude. Negative values for southern latitudes.

Depth

62.635 km

Depth of the event in kilometers.

Place

63 km SSE of Onagawa Chō, Japan

Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.

Time

2025-02-23 04:08:06

Time when the event occurred. UTC/GMT

Updated

2025-02-23 04:44:40

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

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

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

The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.

Horizontal Distance

2.877

Horizontal distance from the epicenter to the nearest station (in degrees).

Root Mean Square

1.01 sec

The root-mean-square (RMS) travel time residual, in sec, using all weights.

Azimuthal Gap

102

The largest azimuthal gap between azimuthally adjacent stations (in degrees).

Magnitude Type

The method or algorithm used to calculate the preferred magnitude for the event.

Event Type

earthquake

Type of seismic event.

Event ID

us7000pfjm

Id of event.

Event Code

7000pfjm

An identifying code assigned by, and unique from, the corresponding source for the event.

Event IDS

,us7000pfjm,

A comma-separated list of event ids that are associated to an event.

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Light earthquake, 4.6 mag strikes near Onagawa Chō in Japan

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