M 7.9 in United States on 23 Jan 2018 09:31 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: 7.9M
Depth: 25 Km
Lat/Lon: 56.0464 , -149.0728
Event Date: 23 Jan 2018 09:31 UTC
Exposed Population: No people within 100km
Source: NEIC us2000cmy3
Inserted at: 23 Jan 2018 10:20 UTC
INFORM Coping capacity of the alert score: 1.1 (United States)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)
Tsunami GDACS score
NEIC 0 0.5 0.5
us2000cmy3 Scaled population (vector) 0 Max wave scenario 1.01m  
  C1 shakemap -0.59 Max wave realtime 0.53m  
  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
1195180 0.8 23 Jan 2018 09:31 8M, 20km N/A No people affected 0.8m (at 01:32) 00:05 NTWC    
1195183 0.4 23 Jan 2018 09:31 7.6M, 10km N/A No people affected 0.5m (at 01:40) 00:08 GEOFON
1195185 0.8 23 Jan 2018 09:31 8M, 19km N/A No people affected 0.8m (at 01:32) 00:12 PTWC
1195191 1.2 23 Jan 2018 09:31 8.2M, 10km N/A No people affected 1.4m (at 01:16) 00:16 NEIC
1195196 0.9 23 Jan 2018 09:31 7.9M, 10km N/A No people affected 0.9m (at 01:16) 00:43 NEIC
1195199 0.5 23 Jan 2018 09:31 7.9M, 25km 4.92 No people affected 0.5m (at 02:10) 00:48 NEIC
The episode that generated the alert; the next major evaluations beyond 12 hours will not trigger additional alerts.
* 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 United States ,of Alaska (population 572,432) . The alertlevel for this event is GREEN

Intensity Population
no people


Shakemaps Timeline

AlertShake id #ScoreepisodeidLat/LonMagnitudeDepthMax MMIDate shake (UTC)Delay (hh:mm) 
1 0 1195199 56.046/-149.073 7.9 25 5.01 23 Jan 2018 10:25 00:53 (new episode)
2 0 1195199 56.046/-149.073 7.9 25 5.01 23 Jan 2018 10:30 00:58 (upd of #1)
3 0 1195199 56.046/-149.073 7.9 25 4.83 23 Jan 2018 18:18 08:46 (upd of #2)
4 0 1195199 56.046/-149.073 7.9 25 4.83 23 Jan 2018 18:45 09:14 (upd of #3)
5 0 1195199 56.046/-149.073 7.9 25 4.92 24 Jan 2018 22:54 1d 13:22 (upd of #4)
6 0 1195199 56.004/-149.166 7.9 14.06 4.84 02 May 2018 14:24 99d 04:52 (upd of #5)

Affected Provinces

Intensity Region Province Country Population
Alaska United States 350000 people
Alaska United States 4200 people
Yukon Territory Canada <1000 people
British Columbia Canada no people

Affected populated places. Areas of interest

Intensity Name Region Province Country City class Population Distance
Port Hobron Alaska United States Village5 - 280 km
McCord Alaska United States Village5 - 281 km
Kodiak Alaska United States City 6300 people 281 km
Nunamiut Alaska United States Village5 - 298 km
Kaguyak Alaska United States Village5 - 304 km
Afognak Alaska United States Village4 - 314 km
Port O'Brien Alaska United States Village5 - 320 km
Port Bailey Alaska United States Village5 - 320 km
Port Wakefield Alaska United States Village4 - 329 km
Port William Alaska United States Village5 - 345 km
Uyak Alaska United States Village4 - 349 km
Ayakulik Alaska United States Village5 - 359 km
Millers Landing Alaska United States Village4 - 427 km
Homer Alaska United States Village5 3900 people 427 km
Diamond Ridge Alaska United States Village5 1800 people 430 km
Anchor Point Alaska United States Village5 1800 people 447 km
Seward Alaska United States Major city 2800 people 455 km
Bear Creek Alaska United States Village5 1700 people 459 km
Woodrow Alaska United States Village5 - 462 km
Kasilof Village Alaska United States Village5 - 496 km
Cohoe Alaska United States Village5 1100 people 499 km
Kalifornsky Alaska United States Village4 5800 people 504 km
Soldotna Alaska United States Village5 3700 people 508 km
Soldocna Alaska United States Village5 - 509 km
Sterling Alaska United States Village5 4700 people 510 km
Kenai Alaska United States Village5 6900 people 519 km
Nikisnka Alaska United States Village5 - 533 km
Nikiski Alaska United States Village5 4300 people 538 km
Nkishka No 2 Alaska United States Village5 - 538 km
Spenard Alaska United States Village4 - 575 km
Nunaka Valley Alaska United States Village4 - 576 km
Anchorage Alaska United States Major city 260000 people 576 km
Eagle River Alaska United States Village5 - 589 km
Chugiak Alaska United States Village4 - 596 km
Birchwood Alaska United States Village5 - 597 km
Eklutna Alaska United States Village5 - 603 km
Matanuska Alaska United States Village5 - 612 km
Portage Alaska United States Village5 - 533 km
Girdwood Alaska United States Village5 - 546 km
Valdez Alaska United States Village5 4000 people 588 km
Chisana Alaska United States Village5 - 781 km
Beaver Creek Yukon Canada Village5 - 844 km
Indian Village Alaska United States Village5 - 871 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)
Kodiak / Lily Lake 40 0
Kodiak Municipal KDK 22 Civ. Paved Yes 7500
Old Harbor 17 0
Ouzinkie 17 0
Blue Fox Bay BFB unknown 0
Kizhuyak KZH unknown 0
Port Lions ORI 16 0
Kitoi Bay KKB unknown 0
Seal Bay SYB unknown 0
Sitkinak SKJ unknown 0
Danger Bay DGB unknown 0
Port Bailey KPY unknown 0
San Juan / Uganik WSJ unknown 0
Pleasant Harbor PTR unknown 0
Akhiok AKK 13 0
Moser Bay KMY unknown 0
Amook Bay unknown 0
Zachar Bay KZB unknown 0
Alitak ALZ unknown 0
Onion Bay ONN unknown 0
West Point Village KWP unknown 0
Karluk Lake KKL 112 0
Uganik UGI unknown 0
Olga Bay KOY unknown 0
Larsen Bay 23 0
Port Williams KPR unknown 0
Karluk KYK 42 0
Middleton Island MDO 27 Civ. Unpaved Yes 3900
Homer HOM 24 Civ. Paved Yes 7400
Glacierview Strip 488 0
Seward SWD 7 Civ. Paved No 4200
Ninilchik NIN 84 0
Winter's Strip 34 0
Quartz Creek JLA 137 0
Kasilof 38 0
Soldotna SXQ 33 Civ. Paved Yes 5000
Dahler Homestead 91 0
Rotor Air 61 0
Gaede 35 0
Dutch Landing Strip 91 0
Doyle Estates 15 0
Mackeys Lakes 53 0
Kenai Municipal ENA 28 Civ. Paved Yes 7500
Arness Lake 38 0
Carty's Airstrip 46 0
Offshore Ststems-Kenai 46 0
Rabbit Creek 11 0
Flying Crown 14 0
Campbell Airstrip 87 0
Anchorage International ANC 44 Civ. Paved Yes 11500
Merrill Field MRI 42 Civ. Paved Yes 4000
Elmendorf AFB EDF 65 Mil. Paved Yes 10000
Bryant Ahp FRN 115 0
Sleepers Strip 38 0
Point Mackenzie 22 0
Valdez VDZ 37 Civ. Paved Yes 6500
Hilltop 114 0
Birchwood 29 Civ. Paved No 4000
Big Lake BGQ 46 0
Colberg 38 0
Drift River DRF 9 0
Girdwood AQY 46 0
Trading Bay Production 61 0
Icy Bay ICY 15 0
Yakutat YAK 10 Civ. Paved Yes 7700
Situk 15 0
Dangerous River 15 0
Glennallen GLQ unknown 0
Gulkana GKN 481 Civ. Paved Yes 5000
Taylor Mountain 305 0
Chisana CZN 1011 0
Nikolai NIB 126 0
Beaver Creek YXQ 649 Civ. Unpaved No 3700
Northway ORT 523 Civ. Paved Yes 5100

Ports

Intensity Name LOCODE Country
Kodiak Wake Island
Port Hobron Wake Island
Womens Bay Wake Island
Ouzinkie Wake Island
Three Saints Bay Wake Island
Dry Spruce Bay Wake Island
Port Obrien Wake Island
Trap Point Wake Island
Port Vita Wake Island
Lazy Bay Wake Island
Larsen Bay Wake Island
Port William Wake Island
Bear Island Wake Island
Uyak Wake Island
Karluk Wake Island
Karluk Wake Island
Chirikof Island Wake Island
Homer USHOI Wake Island
Seward USSEW Wake Island
Ninilchik Wake Island
Kenai Wake Island
Nikiski USNKI Wake Island
Cordova USCDV Wake Island
Anchorage USANC Wake Island
Drift River Wake Island
Valdez Marine Terminal Wake Island
Valdez USVDZ Wake Island
Cape Constantine Wake Island
Kanakanak Wake Island

Dams

Intensity Reservoir Dam Name River Year
Terror Lake Terror River 1984

More information

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