Light earthquake 4.6 mag, 114 km E of Miyako, Japan

A light earthquake magnitude 4.6 (ml/mb) has occurred on Thursday, 114 km E of Miyako, Japan (71 miles). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The 4.6-magnitude earthquake was detected at 05:20:10 / 5:20 am (local time epicenter). Exact location of event, longitude 143.2653 East, latitude 39.7588 North, depth = 35.301 km. The earthquake occurred at a depth of 35.301 km (22 miles). Global time and date of event 18/12/25 / 2025-12-18 05:20:10 / December 18, 2025 @ 5:20 am UTC/GMT. Unique identifier: us6000rvm9. Ids that are associated to the event: us6000rvm9.

In the past 24 hours, there have been two, in the last 10 days five, in the past 30 days fourteen and in the last 365 days one hundred and thirty-nine earthquakes of magnitude 3.0 or greater that was reported 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.

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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: 114 km E of Miyako, Japan. This data comes from the USGS Earthquake Notification Service.

Japan Miyako

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Parameter	Value	Description
Magnitude	4.6 mb	The magnitude for the event.
Longitude	143.2653° East	Decimal degrees longitude. Negative values for western longitudes.
Latitude	39.7588° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	35.301 km	Depth of the event in kilometers.
Place	114 km E of Miyako, Japan	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-12-18 05:20:10	Time when the event occurred. UTC/GMT
Updated	2025-12-18 08:52:16	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	68	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	1.973	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	1.2 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	122	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	us6000rvm9	Id of event.
Event Code	6000rvm9	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us6000rvm9,	A comma-separated list of event ids that are associated to an event.

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Light earthquake 4.6 mag, 114 km E of Miyako, Japan

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