Minor earthquake 3.9 mag, Alamagan region, Northern Mariana Islands

A minor earthquake with magnitude 3.9 (ml/mb) was detected on Wednesday, Alamagan region, Northern Mariana Islands (0 miles). The 3.9-magnitude earthquake has occurred at 12:19:16 / 12:19 pm (local time epicenter). Id of earthquake: us7000q9zt. Event ids that are associated: us7000q9zt. The epicenter was at a depth of 311.505 km (194 miles). Exact location of earthquake, 145.2986° East, 17.9665° North, depth 311.505 km. Global date and time of event UTC/GMT: 18/06/25 / 2025-06-18 12:19:16 / June 18, 2025 @ 12:19 pm.

In the past 24 hours, there have been one, in the last 10 days two, in the past 30 days eight and in the last 365 days seventy earthquakes of magnitude 3.0 or greater that has occurred nearby. Each year there are an estimated 130,000 minor quakes in the world. Earthquakes 3.0 to 4.0 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. 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: Alamagan region, Northern Mariana Islands.

Alamagan region Northern Mariana Islands

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Parameter	Value	Description
Magnitude	3.9 mb	The magnitude for the event.
Longitude	145.2986° East	Decimal degrees longitude. Negative values for western longitudes.
Latitude	17.9665° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	311.505 km	Depth of the event in kilometers.
Place	Alamagan region, Northern Mariana Islands	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-06-18 12:19:16	Time when the event occurred. UTC/GMT
Updated	2025-07-06 07:44:16	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	234	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	24	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	2.751	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.66 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	135	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	us7000q9zt	Id of event.
Event Code	7000q9zt	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us7000q9zt,	A comma-separated list of event ids that are associated to an event.

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Minor earthquake 3.9 mag, Alamagan region, Northern Mariana Islands

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