Light earthquake, 4.7 mag strikes near South Sandwich Islands region

A light earthquake with magnitude 4.7 (ml/mb) was detected on Friday, South Sandwich Islands region (0 miles). A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). The earthquake occurred at a depth of 72.921 km (45 miles). Exact location of event, longitude -27.8286 West, latitude -55.82 South, depth = 72.921 km. Date and time of earthquake in UTC/GMT: 04/07/25 / 2025-07-04 15:37:55 / July 4, 2025 @ 3:37 pm. Id of earthquake: us7000qb53. Event ids that are associated: us7000qb53. The temblor was reported at 15:37:55 / 3:37 pm (local time epicenter).

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

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Did objects rattle, topple over, or fall off shelves? Leave a comment or report about activity, shaking and damage at your home, country and city. Read more about the earthquake, Location, Distances, Seismometer information, Date-Time, Parameters and details about this quake, reported near: South Sandwich Islands region. This information comes from the USGS Earthquake Notification Service.

South Sandwich Islands region

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Parameter	Value	Description
Magnitude	4.7 mb	The magnitude for the event.
Longitude	-27.8286° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	-55.82° South	Decimal degrees latitude. Negative values for southern latitudes.
Depth	72.921 km	Depth of the event in kilometers.
Place	South Sandwich Islands region	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-07-04 15:37:55	Time when the event occurred. UTC/GMT
Updated	2025-07-21 14:29:17	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	340	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	19	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	5.211	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	1.02 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	195	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	us7000qb53	Id of event.
Event Code	7000qb53	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us7000qb53,	A comma-separated list of event ids that are associated to an event.

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Light earthquake, 4.7 mag strikes near South Sandwich Islands region

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