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Light World Earthquakes Magnitude 4-4.9

Light earthquake, 4.5 mag was detected near Merizo Village in Guam

Posted by admin on September 18, 2025 0 Comments

Earthquake location 12.6117S, 144.3192WA light earthquake with magnitude 4.5 (ml/mb) was reported 81 kilometers (50 miles) from Merizo Village in Guam on Thursday. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Exact time and date of event in UTC/GMT: 21/08/25 / 2025-08-21 02:42:14 / August 21, 2025 @ 2:42 am. The temblor was picked up at 02:42:14 / 2:42 am (local time epicenter). The epicenter was at a depth of 35 km (22 miles). Exact location of earthquake, longitude 144.3192 East, latitude 12.6117 North, depth = 35 km. Event ids that are associated to the earthquake: us7000qwgz. Id of event: us7000qwgz.

Earthquake epicenter was 94 km (59 miles) from Santa Rita Village (c. 7 500 pop), 94 km (58 miles) from Agat Village (c. 5 700 pop), 95 km (59 miles) from Talofofo Village (c. 3 200 pop), 87 km (54 miles) from Inarajan Village (c. 3 100 pop), 82 km (51 miles) from Merizo Village (c. 2 200 pop), 85 km (53 miles) from Umatac Village (c. 900 pop). Closest city/cities or villages, with min 5000 pop, to hypocenter/epicentrum was Talofofo Village, Santa Rita Village, Agat Village. Close country/countries, Guam (c. 159 000 pop) (That might be effected).

Each year there are an estimated 13,000 light earthquakes in the world. 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 five and in the last 365 days fifty-six earthquakes of magnitude 3.0 or greater that have been detected nearby.

Questions or comments?

How did you respond? Did any furniture slide, topple over, or become displaced? Leave a comment or report about activity, shaking and damage 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: 81 km SSW of Merizo Village, Guam.

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More information

Parameter Value Description
Magnitude 4.5 mb The magnitude for the event.
Longitude 144.3192° East Decimal degrees longitude. Negative values for western longitudes.
Latitude 12.6117° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 35 km Depth of the event in kilometers.
Place 81 km SSW of Merizo Village, Guam Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2025-08-21 02:42:14 Time when the event occurred. UTC/GMT
Updated 2025-09-18 00:49:21 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 23 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 1.109 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 1.15 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 156 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 us7000qwgz Id of event.
Event Code 7000qwgz An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,us7000qwgz, A comma-separated list of event ids that are associated to an event.

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