Light earthquake, 4.5 mag was detected near western Indian-Antarctic Ridge

A light earthquake magnitude 4.5 (ml/mb) strikes western Indian-Antarctic Ridge (0 miles) on Monday. The epicenter of the earthquake was roughly 10 km (6 miles) below the earth’s surface. Global time and date of event 21/07/25 / 2025-07-21 21:41:04 / July 21, 2025 @ 9:41 pm UTC/GMT. The temblor was detected at 21:41:04 / 9:41 pm (local time epicenter). Exact location, longitude 124.6257° East, latitude -48.6559° South, depth = 10 km. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Unique identifier: us6000qybd. Ids that are associated to the event: us6000qybd.

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. In the past 24 hours, there have been two, in the last 10 days two, in the past 30 days three and in the last 365 days twelve earthquakes of magnitude 3.0 or greater that has struck near.

Questions or comments?

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. 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: western Indian-Antarctic Ridge.

Western Indian-Antarctic Ridge

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Parameter	Value	Description
Magnitude	4.5 mb	The magnitude for the event.
Longitude	124.6257° East	Decimal degrees longitude. Negative values for western longitudes.
Latitude	-48.6559° South	Decimal degrees latitude. Negative values for southern latitudes.
Depth	10 km	Depth of the event in kilometers.
Place	western Indian-Antarctic Ridge	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-07-21 21:41:04	Time when the event occurred. UTC/GMT
Updated	2025-08-07 03:27:47	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	312	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	14	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	16.663	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.76 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	133	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	us6000qybd	Id of event.
Event Code	6000qybd	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,us6000qybd,	A comma-separated list of event ids that are associated to an event.

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Light earthquake, 4.5 mag was detected near western Indian-Antarctic Ridge

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