M 4.8 in Guam on 22 Jan 2021 13:51 UTC

Hazard models

EQ parameters
Shakemap
Tsunami

Event summary

This earthquake is expected to have a low humanitarian impact based on the magnitude and the affected population and their vulnerability.

Earthquake Magnitude: 4.8M
Depth: 41.7 Km
Lat/Lon: 12.7981 , 144.3558
Event Date: 22 Jan 2021 13:51 UTC
22 Jan 2021 23:51 Local
Exposed Population:
140000 people within 100km
Source: NEIC us7000d2da
Inserted at: 22 Jan 2021 14:11 UTC

GDACS Score

For more info on GDACS alert score click here.
  Earthquake GDACS score
NEIC 0 0
us7000d2da Scaled population (vector) 4.28  
  C1 earthquake 1  
  C2 earthquake 0  
  Country Vulnerability 0  
  INFORM_normalised 1  
Maximum expected impact using different data sources.

Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1354324 0 22 Jan 2021 13:51 4.8M, 41.7km N/A 150 thousand (in 100km) 00:20 NEIC
The episode that generated the alert; the next major evaluations beyond 12 hours will not trigger additional alerts.
The episode that has the last updated information.
* The max MMI detected for sources having shakemaps;
** The population detected in MMI>=7 for episode with shakemap or in a 100km radius;
*** The tsunami max height.

Exposed population

The earthquake happened in Guam , of Guam (population 143,173) . The nearest places are Merizo, Umatac, Inarajan, and Hagåtña.

Radius Population
100 km 150000 people
75 km 11000 people
50 km no people
20 km no people
10 km no people
5 km no people
2 km no people

Affected Provinces

Region Province Country Population
Guam Guam 140000 people
Northern Mariana Is. Northern Mariana Islands 61000 people

Affected populated places

Name Region Province Country City class Population Distance
Merizo Guam Village 1700 people 62 km
Umatac Guam Village - 65 km
Inarajan Guam Village <1000 people 67 km
Hagåtña Guam Capital 1000 people 85 km

see full list

Critical infrastructure

Airports, ports, nuclear plants and hydrodams at risk, if affected, are listed below.

Airports

Name IATA Code Elevation (m) Usage Runway type IFR Runway Length (ft) Distance
A.B. Won Pat International GUM 91 0 90 km

Ports

Name LOCODE Country Distance
Apra Harbor Guam 77 km
Apra (Agana) GUAPR Guam 80 km

More information

For a full list of available products related to this event, please refer to the GDACS Resources page.