M7.8 in Aleutians (1 Viewer)


bjdeming

Member
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224
Location
Corvallis, Oregon
It was shallow but offshore and the USGS PAGER code is green.

Per Tsunami.gov right now:

PRELIMINARY EARTHQUAKE PARAMETERS
---------------------------------

* MAGNITUDE 7.8
* ORIGIN TIME 0613 UTC JUL 22 2020
* COORDINATES 55.2 NORTH 158.6 WEST
* DEPTH 13 KM / 8 MILES
* LOCATION ALASKA PENINSULA


EVALUATION
----------

* AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 7.8 OCCURRED IN
THE ALASKA PENINSULA AT 0613 UTC ON WEDNESDAY JULY 22 2020.

* BASED ON ALL AVAILABLE DATA... HAZARDOUS TSUNAMI WAVES ARE
NOT FORECAST FOR SOME COASTS.
WE ARE STILL WAITING FOR MORE DATA TO CONFIRM.


TSUNAMI THREAT FORECAST...UPDATED
---------------------------------

* TSUNAMI WAVES ARE FORECAST TO BE LESS THAN 0.3 METERS ABOVE
THE TIDE LEVEL FOR THE COASTS OF

CHUUK... GUAM... HAWAII... HOWLAND AND BAKER... JAPAN...
JOHNSTON ATOLL... KIRIBATI... KOSRAE... MARSHALL
ISLANDS... MEXICO... MIDWAY ISLAND... NORTHERN MARIANAS...
NORTHWESTERN HAWAIIAN ISLANDS... PALAU... PALMYRA
ISLAND... POHNPEI... RUSSIA... WAKE ISLAND... AND YAP.

However, a seismologist I follow just tweeted


and then commented that the signals are smaller at other buoys. Hope it's just local conditions.

No warnings at the PNW coasts yet .

Here's an updating Alaska news source: https://www.alaskapublic.org/2020/0...i-warning-for-sand-point-cold-bay-and-kodiak/

And the Sand Point data graphic: https://tidesandcurrents.noaa.gov/tsunami/plot.html?stnid=9459450&name=Sand Point&refresh=1
 
Last edited:

bjdeming

Member
Messages
224
Location
Corvallis, Oregon
PTWC says the threat is over: just half-foot wave at Sand Point. Whew! Now to just watch the USGS aftershock forecasts and hope this wasn't a foreshock.

Those NOAA data graphics are great, BTW.
 

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