M 6.4 in Northern Mariana Islands on 28 Aug 2018 22:35 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: 6.4M
Depth: 59.9 Km
Lat/Lon: 16.7605 , 146.8723
Event Date: 28 Aug 2018 22:35 UTC
29 Aug 2018 08:35 Local
Exposed Population: No people within 100km
Source: NEIC us1000gj78
Inserted at: 28 Aug 2018 22:56 UTC
INFORM Coping capacity of the alert score: 1.1 (Northern Mariana Is.)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)		 Tsunami GDACS score
NEIC 0 0 0
us1000gj78 Scaled population (vector) 0 Max wave alert 0m  
  C1 shakemap -0.59 Max wave realtime 0m  
  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
1226168 0 28 Aug 2018 22:35 6.5M, 10km N/A No people affected (in 100km) 0m (at 00:00) 00:06 GEOFON
1226170 0 28 Aug 2018 22:35 6.6M, 51.3km 4.1 N/A (in MMI>=VII) 0m (at 00:00) 00:10 PTWC
1226172 0 28 Aug 2018 22:35 6.6M, 53km N/A No people affected (in 100km) 0m (at 00:00) 00:11 NTWC    
1226176 0 28 Aug 2018 22:35 6.4M, 59.9km 4.04 N/A (in MMI>=VII) 0m (at 00:00) 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 Northern Mariana Islands ,of Northern Mariana Is. (population 40,180) . 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 1226170 16.76/146.872 6.4 59.9 4.1 28 Aug 2018 22:55 00:20 (new episode)
2 0 1226176 16.76/146.872 6.4 59.9 4.1 28 Aug 2018 22:56 00:21 (new episode)
3 0 1226176 16.76/146.872 6.4 59.9 4.04 29 Aug 2018 00:37 02:02 (upd of #2)

Affected Provinces

Intensity Region Province Country Population
Northern Mariana Is. Northern Mariana Islands 40000 people
Northern Mariana Is. Northern Mariana Islands 3000 people
Guam Guam 150000 people

Affected populated places. Areas of interest

Intensity Name Region Province Country City class Population Distance
Tanapag Northern Mariana Islands Village 4300 people 209 km
Mutcho Northern Mariana Islands Village - 211 km
Garapan Northern Mariana Islands Village 4100 people 212 km
Saipan Northern Mariana Islands Capital 62000 people 212 km
Chalan Kanoa Northern Mariana Islands Village 3200 people 216 km
Aslito Northern Mariana Islands Village - 218 km
Sunharon Roads Northern Mariana Islands Village - 239 km
Upi Guam Village - 410 km
Asatdas Guam Village - 412 km
Dededo Guam Village 3300 people 418 km
Tamuning Guam Village 11000 people 427 km
Barrigada Guam Village 4700 people 427 km
Mongmong Guam Village 3700 people 429 km
Camp Quezon Guam Village - 429 km
Hagåtña Guam Capital 1000 people 430 km
Sinajana Guam Village 2100 people 430 km
Asan Guam Village - 432 km
Piti Guam Village - 434 km
Yona Guam Village 2300 people 434 km
Ylig Guam Village - 437 km
Camp Bright Guam Village - 440 km
Santa Rita Guam Village 1300 people 442 km
Agat Guam Village 4400 people 443 km

see full list


Critical infrastructure

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

Airports

Intensity Name IATA Code Elevation (m) Usage Runway type IFR Runway Length (ft) Distance
Nikko 18 0 204 km
Commonwealth Health Center 5 0 211 km
Saipan International SPN 66 Civ. Paved Yes 8700 219 km
Pagan Airstrip 10 0 191 km
West Tinian TIQ 82 Civ. Paved Yes 5900 237 km
Dynasty 46 0 239 km
Rota I International ROP 185 Civ. Paved Yes 6000 335 km
A.B. Won Pat International GUM 91 0 426 km

Ports

Intensity Name LOCODE Country Distance
Farallon de Medinilla Northern Mariana Islands 117 km
Guguan Island Northern Mariana Islands 124 km
Saipan MPSPN Northern Mariana Islands 212 km
Pagan Island Northern Mariana Islands 192 km
Tinian Northern Mariana Islands 239 km
Apra (Agana) GUAPR Guam 436 km
Apra Harbor Guam 440 km

More information

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