M 5.6 in Northern Mariana Islands on 13 Feb 2018 02:31 UTC

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: 5.6M
Depth: 10 Km
Lat/Lon: 13.7393 , 146.3945
Event Date: 13 Feb 2018 02:31 UTC
13 Feb 2018 12:31 Local
Exposed Population: No people affected in MMI IX
No people within 100km
Source: NEIC us2000d1a0
Inserted at: 13 Feb 2018 02:48 UTC
INFORM Coping capacity of the alert score: 1.1 (Northern Mariana Is.)


For more info on GDACS alert score click here.
GDACS score
NEIC 0 0
us2000d1a0 Scaled population (vector) -8  
  C1 shakemap -0.59  
  C2 shakemap 0.53  
  Country Vulnerability 0  
  INFORM_normalised 1  
Maximum expected impact using different data sources.

ShakeMap is a product of the USGS Earthquake Hazards Program in conjunction with the regional seismic networks. ShakeMaps provide near-real-time maps of ground motion and shaking intensity following significant earthquakes.

Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1198706 0 13 Feb 2018 02:31 5.6M, 10km 3.31 No people affected 00:17 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 Northern Mariana Islands ,of Northern Mariana Is. (population 60,963) . The alertlevel for this event is GREEN

Intensity Population
no people
no people

Shakemaps Timeline

AlertShake id #ScoreepisodeidLat/LonMagnitudeDepthMax MMIDate shake (UTC)Delay (hh:mm) 
1 0 1198706 13.739/146.394 5.6 10 2.99 13 Feb 2018 02:49 00:18 (new episode)
2 0 1198706 13.739/146.394 5.6 10 3.31 13 Feb 2018 04:33 02:02 (upd of #1)

Affected Provinces

Intensity Region Province Country Population
Northern Mariana Is. Northern Mariana Islands 25000 people
Guam Guam 150000 people

Affected populated places. Areas of interest

Intensity Name Region Province Country City class Population Distance
Rota Northern Mariana Islands Village - 137 km
Teteto Northern Mariana Islands Village - 138 km
Sunharon Roads Northern Mariana Islands Village - 158 km
Asatdas Guam Village - 162 km
Upi Guam Village - 163 km
Aslito Northern Mariana Islands Village - 167 km
Dededo Guam Village 3300 people 170 km
Chalan Kanoa Northern Mariana Islands Village 3100 people 172 km
Camp Quezon Guam Village - 175 km
Barrigada Guam Village 4600 people 175 km
Tamuning Guam Village 11000 people 177 km
Mongmong Guam Village 3700 people 179 km
Yona Guam Village 2200 people 179 km
Sinajana Guam Village 2000 people 180 km
Hagåtña Guam Capital 1000 people 181 km
Ylig Guam Village - 181 km
Talofofo Guam Village 2600 people 183 km
Asan Guam Village - 184 km
Inarajan Guam Village <1000 people 186 km
Piti Guam Village - 187 km
Santa Rita Guam Village 1200 people 191 km
Camp Bright Guam Village - 191 km
Agat Guam Village 4300 people 192 km
Umatac Guam Village - 193 km
Merizo Guam Village 1700 people 194 km

see full list

Critical infrastructure

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


Intensity Name IATA Code Elevation (m) Usage Runway type IFR Runway Length (ft)
Rota I International ROP 185 Civ. Paved Yes 6000
Dynasty 46 0
Andersen AFB UAM 191 0
West Tinian TIQ 82 Civ. Paved Yes 5900
Saipan International SPN 66 Civ. Paved Yes 8700
A.B. Won Pat International GUM 91 0


Intensity Name LOCODE Country
Rota Northern Mariana Islands
Tinian Northern Mariana Islands
Apra (Agana) GUAPR Guam
Apra Harbor Guam

More information

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