Minor earthquake: M3.87 quake has struck near Mammoth in Wyoming

A minor earthquake magnitude 3.87 (ml/mb) has struck on Tuesday, 21 km SW of Mammoth, Wyoming (13 miles). The epicenter was at a depth of 0.81000000238419 km (1 miles). Date and time of earthquake in UTC/GMT: 19/08/25 / 2025-08-19 17:14:52 / August 19, 2025 @ 5:14 pm. Exact location, longitude -110.8570022583° West, latitude 44.817501068115° North, depth = 0.81000000238419 km. Id of earthquake: uu80114071. Event ids that are associated: uu80114071. The 3.87-magnitude earthquake has occurred at 17:14:52 / 5:14 pm (local time epicenter).

There are an estimated 130,000 minor earthquakes in the world each year. In the past 24 hours, there have been one, in the last 10 days two, in the past 30 days two and in the last 365 days three earthquakes of magnitude 3.0 or greater that have been detected nearby. Earthquakes 3.0 to 4.0 are often felt, but only causes minor damage.

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How did you react? Was there any damage to buildings? Leave a comment or report about shaking, activity and damage at your home, city 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: 21 km SW of Mammoth, Wyoming.

Mammoth Wyoming

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Parameter	Value	Description
Magnitude	3.87 mb	The magnitude for the event.
Longitude	-110.8570022583° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	44.817501068115° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	0.81000000238419 km	Depth of the event in kilometers.
Place	21 km SW of Mammoth, Wyoming	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-08-19 17:14:52	Time when the event occurred. UTC/GMT
Updated	2025-08-19 17:21:58	Time when the event was most recently updated. UTC/GMT
Timezone offset		Timezone offset from UTC in minutes at the event epicenter.
Felt	2	The total number of felt reports
CDI	4.1	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	automatic	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	231	A number describing how significant the event is. Larger numbers indicate a more significant event.
Network	uu	The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources	,uu,	A comma-separated list of network contributors.
Number of Stations Used	35	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.1109	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.699999988 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	36	The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type	ml	The method or algorithm used to calculate the preferred magnitude for the event.
Event Type	earthquake	Type of seismic event.
Event ID	uu80114071	Id of event.
Event Code	80114071	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,uu80114071,	A comma-separated list of event ids that are associated to an event.

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Minor earthquake: M3.87 quake has struck near Mammoth in Wyoming

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