Overall Orange Earthquake alert in United States from 29 Jul 2021 06:15 UTC to 06:15

GDACS is a cooperation framework between the United Nations, the European Commission and disaster managers worldwide to improve alerts, information exchange and coordination in the first phase after major sudden-onset disasters.

M 8.2 in United States from 29 Jul 2021 06:15 UTC to 06:15

Hazard models

EQ parameters

Shakemap

Tsunami

Event summary

This earthquake is expected to have a medium humanitarian impact based on the magnitude and the affected population and their vulnerability.

Earthquake Magnitude:	8.2M
Depth:	46.66 Km
Event Date:	29 Jul 2021 06:15 UTC 28 Jul 2021 19:15 Local
Exposed Population:	Less then 100 people in MMI VI About 400 people within 100km
Source:	NEIC us6000f02w
Inserted at:	29 Jul 2021 06:51 UTC
INFORM Coping capacity of the alert score:	2.2 (United States)

GDACS Score

For more info on GDACS alert score click here.

	Earthquake (Shakemap)		Tsunami		GDACS score
NEIC	0		0		1.7
us6000f02w	Scaled population (raster)	0	Max wave alert	0m
	C1 shakemap	-0.59	Max wave realtime	2.4m
	C2 shakemap	0.53
	Country Vulnerability	0
	INFORM_normalised	0.65

Maximum expected impact using different data sources.

Click on image to zoom it.

Episode Timeline

ID	Score	Date	Mag, Depth	MMI*	Population**	Tsunami risk***	Delay (hh:mm)	Source
1387963	0.2	29 Jul 2021 06:15	7.2M, 35km	N/A	No people affected (in 100km)	0.3m (at 00:54)	00:08	ALASKA EC
1387964	0.5	29 Jul 2021 06:15	7.3M, 3.4km	5.28	N/A (in MMI>=VII)	0.5m (at 01:06)	00:19	ALASKA EC
1387970	0.6	29 Jul 2021 06:15	7.3M, 5.5km	N/A	No people affected (in 100km)	0.6m (at 00:54)	00:24	ALASKA EC
1387980	1.7	29 Jul 2021 06:15	8.2M, 46.66km	6.42	N/A (in MMI>=VII)	2.4m (at 00:50)	00:35	NEIC
1388004	1.8	29 Jul 2021 06:15	8.2M, 32.2km	7.55	1 thousand (in MMI>=VII)	2.6m (at 00:50)	01:40	ALASKA EC

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.

Tsunami affected locations

The maximum Wave height is 2.4m in Mitrofania, United States. This height is estimated for 29-Jul-2021 06:59:42.

Alert	Date (UTC)	Name	Country	Wave height (m)
	29-Jul-2021 06:59:42	Mitrofania	United States	2.4
	29-Jul-2021 06:57:02	Perryville	United States	2.3
	29-Jul-2021 11:59:61	Akhiok	United States	1.3
	29-Jul-2021 10:58:65	Sand Point	United States	1.0
	29-Jul-2021 10:58:65	Sand_Point_AK	USA	1.0
	29-Jul-2021 10:46:96	Village	United States	0.8
	29-Jul-2021 11:26:94	Alitak_US	USA	0.8
	29-Jul-2021 11:09:45	Belkofski	United States	0.6
	29-Jul-2021 10:32:14	Unga	United States	0.4
	29-Jul-2021 09:21:55	Biorka	United States	0.3
	29-Jul-2021 11:38:06	Uyak	United States	0.3
	29-Jul-2021 11:02:74	Ayakulik	United States	0.2
	29-Jul-2021 10:31:82	Umnak	United States	0.2
	29-Jul-2021 11:59:61	Pauloff Harbor	United States	0.2
	29-Jul-2021 09:45:64	King Cove	United States	0.2
	29-Jul-2021 11:52:22	Kaguyak	United States	0.2
	29-Jul-2021 11:59:61	Sanak	United States	0.2
	29-Jul-2021 10:06:67	McCord	United States	0.2
	29-Jul-2021 11:59:61	Kachemak Silo	United States	0.2
	29-Jul-2021 11:59:61	Kamishak	United States	0.1
	29-Jul-2021 11:15:76	Karluk	United States	0.1
	29-Jul-2021 10:47:76	Ikatan	United States	0.1
	29-Jul-2021 11:35:75	Halibut Cove	United States	0.1
	29-Jul-2021 08:55:87	Kashega	United States	0.1
	29-Jul-2021 09:44:85	Port William	United States	0.1
	29-Jul-2021 11:27:81	Millers Landing	United States	0.1
	29-Jul-2021 11:27:81	Kachemak	United States	0.1
	29-Jul-2021 10:03:35	Cape Yakataga	United States	0.1
	29-Jul-2021 10:24:39	Ouzinkie	United States	0.1
	29-Jul-2021 10:19:06	Portlock	United States	0.1
	29-Jul-2021 11:20:21	Diamond Ridge	United States	0.1
	29-Jul-2021 11:20:21	Homer	United States	0.1
	29-Jul-2021 11:30:28	Bear Creek	United States	0.1
	29-Jul-2021 08:22:48	Port Moller	United States	0.1
	29-Jul-2021 10:56:89	Kodiak	United States	0.1
	29-Jul-2021 10:56:89	Aleksashkina	United States	0.1
	29-Jul-2021 10:45:58	English Bay	United States	0.1
	29-Jul-2021 11:12:88	Seldovia	United States	0.1
	29-Jul-2021 11:33:65	Happy Valley	United States	0.1
	29-Jul-2021 11:45:83	Ninilchik	United States	0.1
	29-Jul-2021 10:31:85	Chernofski	United States	0.1

See full locations list (RSS)

Initial conditions

Title: ""M8.2 91 km ESE of Perryville. Alaska""

Fault parameters

Latitude: 55.474
Longitude: -157.917
Length: 199 km
Width: 55 km
Magnitude: 8.2 M

Okada parameters:

Slip: 5.1 m
Strike: 247 (geogr angle: north=0, south=180)
Dip: 15 degree
Rake: 90 degree
Depth: 47 km

Calculation parameters

Calculation space (lon/lat): -177.417, 35.974, -138.417, 70
Instead of Step -> use Cell size:3.25 minutes

Sea Level

More information

Timeline:
Tsunami calculations performed to this case, click here
Montecarlo:
Tsunami Montecarlo simulation performed to this case, click here

Populated places affected by tsunami:
http://webcritech.jrc.ec.europa.eu/ModellingOutput/TsunamiSurge/JETS_System/2021/07/33453/locations.xml
Populated places affected by tsunami (KML):
http://webcritech.jrc.ec.europa.eu/ModellingOutput/TsunamiSurge/JETS_System/2021/07/33453/locations.kml

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

Disclaimer
While we try everything to ensure accuracy, this information is purely indicative and should not be used for any decision making without alternate sources of information.
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