M 4.73 Off-shore on 21 Jul 2016 23:09 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: 4.7M
Depth: 22.85 Km
Lat/Lon: 40.7171669 , -123.8970032
Event Date: 21 Jul 2016 23:09 UTC
21 Jul 2016 16:09 Local
Exposed Population:
No people within 100km
Source: NCAL SS nc72664436
Inserted at: 22 Jul 2016 00:51 UTC

GDACS Score

For more info on GDACS alert score click here.
  Earthquake GDACS score
NCAL SS 0 0
nc72664436 Scaled population (vector) n.a  
  C1 earthquake n.a  
  C2 earthquake n.a  
  Country Vulnerability n.a  
  INFORM_normalised n.a  
Maximum expected impact using different data sources.

Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1134469 0 21 Jul 2016 23:09 4.63M, 22.85km 3.92 No people affected (in 100km) 00:05 NCAL SS
1134471 0 21 Jul 2016 23:09 4.76M, 22.85km 3.91 No people affected (in 100km) 00:08 NCAL SS
1134477 0 21 Jul 2016 23:09 4.73M, 22.85km 4.75 No people affected (in 100km) 01:41 NCAL SS
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 United States , State of California (population 30,971,320) . The nearest places are Maple Creek, Kneeland, Lone Star Junction, Dinsmores, Freshwater, The Springs, Janes Place, Fernwood, Korbel, Indianola, and Cain Rock.

Radius Population
100 km 150000 people
75 km 140000 people
50 km 130000 people
20 km 5100 people
10 km <1000 people
5 km <1000 people
2 km no people

Affected Provinces

Region Province Country Population
California United States 31 million people

Affected populated places

Name Region Province Country City class Population Distance
Maple Creek California United States Village - 5 km
Kneeland California United States Village - 10 km
Lone Star Junction California United States Village - 10 km
Dinsmores California United States Village - 13 km
Freshwater California United States Village - 15 km
The Springs California United States Village - 15 km
Janes Place California United States Village - 17 km
Fernwood California United States Village - 17 km
Korbel California United States Village - 18 km
Indianola California United States Village - 19 km
Yager California United States Village - 19 km
Bayside California United States Village - 20 km
Blue Lake California United States Village 1100 people 20 km
Fickle Hill California United States Village - 20 km
Brainard California United States Village - 21 km
Myrtletown California United States Village 4500 people 21 km
Sunny Brae California United States Village - 21 km
Cutten California United States Village 2900 people 21 km
Pine Hills California United States Village 3100 people 22 km
Eureka California United States City 26000 people 23 km
Arcata California United States City 17000 people 23 km
Glendale California United States Village - 23 km
Newburg California United States Village - 23 km
Elk River California United States Village - 24 km
Bayview California United States Village 2400 people 24 km
Carlotta California United States Village - 24 km
Humboldt Hill California United States Village 3200 people 25 km
Hydesville California United States Village 1200 people 25 km
Alliance California United States Village - 25 km
Fortuna California United States Village 10000 people 25 km
Korblex California United States Village - 25 km
Spruce Point California United States Village - 26 km
Riverside Park California United States Village - 26 km
Rohnerville California United States Village - 26 km
Beatrice California United States Village - 26 km
Fairhaven California United States Village - 27 km
Fields Landing California United States Village - 27 km
Willow Creek California United States Village 1700 people 27 km
Samoa California United States Village - 27 km
Manila California United States Village - 27 km
Alton California United States Village - 28 km
Maple Grove California United States Village - 28 km
Fernbridge California United States Village - 28 km
Bridgeville California United States Village - 28 km
Loleta California United States Village - 29 km
Rio Dell California United States Village 3200 people 29 km
Calville California United States Village - 30 km
Southport Landing California United States Village - 30 km
Belleview California United States Village - 30 km
Tyee City California United States Village - 30 km
Fieldbrook California United States Village - 30 km
Metropolitan California United States Village - 31 km
Waddington California United States Village - 31 km
Pepperwood California United States Village - 31 km
Scotia California United States Village - 31 km
Elinor California United States Village - 31 km
Shively California United States Village - 32 km
McKinleyville California United States Village 14000 people 32 km
Stafford California United States Village - 32 km
Arlynda Corners California United States Village - 33 km
Holmes California United States Village - 33 km
Salyer California United States Village - 33 km
Ferndale California United States Village 1400 people 34 km
Hacketsville California United States Village - 34 km
Larabee California United States Village - 35 km
Dinsmores California United States Village - 35 km
Port Kenyon California United States Village - 35 km
Redcrest California United States Village - 35 km
Clam Beach California United States Village - 36 km
Hawkins Bar California United States Village - 36 km
Crannell California United States Village - 36 km
Wigdon Place California United States Village - 37 km
Burnt Ranch California United States Village - 37 km
Hyampom California United States Village - 39 km
Westhaven California United States Village - 40 km
South Fork California United States Village - 41 km
Camp Grant California United States Village - 42 km
Hoopa California United States Village - 43 km
Hoboken California United States Village - 43 km
Weott California United States Village - 44 km
Trinidad California United States Village <1000 people 44 km
McCann California United States Village - 44 km
Mad River California United States Village - 45 km
Burlington California United States Village - 45 km
Whitlow California United States Village - 46 km
Fruitland California United States Village - 47 km
Capetown California United States Village - 48 km
McClellan Place California United States Village - 48 km
Del Loma California United States Village - 48 km
Miller Place California United States Village - 49 km
Delloma California United States Village - 49 km
Eel Rock California United States Village - 50 km
Sids Place California United States Village - 50 km
Patricks Point California United States Village - 50 km
Myers Flat California United States Village - 50 km
Denny California United States Village - 51 km
Friend Place California United States Village - 52 km
Graham Place California United States Village - 53 km
Big Lagoon California United States Village - 53 km
Blocksburg California United States Village - 54 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
Kneeland 834 0 3 km
Murray Field EKA 2 Civ. Paved Yes 3000 21 km
Rohnerville 119 Civ. Paved Yes 4000 27 km
Eureka Municipal 6 0 28 km
Arcata ACV 66 Civ. Paved Yes 5900 34 km
Dinsmore 724 0 35 km
Hyampom 381 0 37 km
Hoopa 109 0 41 km
Hayfork 707 0 63 km
Silver Creek Ranch 765 0 70 km
Garberville 166 0 70 km
Ruth 843 0 76 km
Hell'er High Water 760 0 77 km
Shelter Cove 21 0 78 km
Lonnie Pool Field Weaverville 716 0 82 km
Andy Mc Beth 13 0 89 km

Ports

Name LOCODE Country Distance
Eureka USEKA Wake Island 27 km
Fields Landing Wake Island 27 km
Cape Mendocino Wake Island 54 km

Dams

Reservoir Dam Name River Year Distance
Ruth Lake Robert W. Matthews Mad River 1962 55 km
Clair Engle Lake Trinity Trinity River 1962 96 km

Nuclear plants

Name Country Reactors Distance
HUMBOLDT BAY UNITED STATES 1 26 km

More information

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