M 4.6 in Guam on 29 Jan 2021 22:33 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: 4.6M
Depth: 107.58 Km
Lat/Lon: 14.1773 , 145.1514
Event Date: 29 Jan 2021 22:33 UTC
30 Jan 2021 08:33 Local
Exposed Population:
140000 people within 100km
Source: NEIC us6000dd3m
Inserted at: 29 Jan 2021 23:29 UTC

GDACS Score

For more info on GDACS alert score click here.
  Earthquake GDACS score
NEIC 0 0
us6000dd3m Scaled population (vector) 4.64  
  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
1355596 0 29 Jan 2021 22:33 4.6M, 107.58km N/A 150 thousand (in 100km) 00:55 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 Songsong, Teteto, Rota, Sinapalo, and Hagåtña.

Radius Population
100 km 150000 people
75 km 12000 people
50 km 2500 people
20 km 2500 people
10 km 2400 people
5 km 1200 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
Songsong Northern Mariana Islands Village 1300 people 5 km
Teteto Northern Mariana Islands Village - 5 km
Rota Northern Mariana Islands Village - 6 km
Sinapalo Northern Mariana Islands Village - 9 km
Hagåtña Guam Capital 1000 people 90 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
Rota I International ROP 185 Civ. Paved Yes 6000 10 km
Andersen AFB UAM 191 0 70 km
A.B. Won Pat International GUM 91 0 86 km

Ports

Name LOCODE Country Distance
Rota Northern Mariana Islands 5 km
Apra (Agana) GUAPR Guam 96 km
Apra Harbor Guam 99 km

More information

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