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8.1 Alaska Peninsula earthquake prompts Tsunami Warning

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BULLETIN
Public Tsunami Message Number 1
NWS National Tsunami Warning Center Palmer AK
1021 PM AKDT Wed Jul 28 2021

...A TSUNAMI WARNING IS NOW IN EFFECT...


...A TSUNAMI ADVISORY IS NOW IN EFFECT...


Tsunami Warning in Effect for;

 * SOUTH ALASKA AND THE ALASKA PENINSULA, Pacific coasts from
   Hinchinbrook Entrance, Alaska (90 miles E of Seward) to
   Unimak Pass, Alaska (80 miles NE of Unalaska)

 * ALEUTIAN ISLANDS, Unimak Pass, Alaska (80 miles NE of
   Unalaska) to Samalga Pass, Alaska (30 miles SW of Nikolski)


Tsunami Advisory in Effect for;

 * SOUTHEAST ALASKA, The inner and outer coast from Cape
   Decision, Alaska (85 miles SE of Sitka) to Cape
   Fairweather, Alaska (80 miles SE of Yakutat)

 * SOUTH ALASKA AND THE ALASKA PENINSULA, Pacific coasts from
   Cape Fairweather, Alaska (80 miles SE of Yakutat) to
   Hinchinbrook Entrance, Alaska (90 miles E of Seward)

 * ALEUTIAN ISLANDS, Samalga Pass, Alaska (30 miles SW of
   Nikolski) to Amchitka Pass, Alaska (125 miles W of Adak)
   including the Pribilof Islands


For other US and Canadian Pacific coasts in North America, 
the level of tsunami danger is being evaluated.  Further
information will be provided in supplementary messages.


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

 * The following parameters are based on a rapid preliminary
   assessment of the earthquake and changes may occur.

 * Magnitude      8.1
 * Origin Time    2216 AKDT Jul 28 2021
                  2316  PDT Jul 28 2021
                  0616  UTC Jul 29 2021
 * Coordinates    55.5 North 157.9 West
 * Depth          11 miles
 * Location       60 miles SE of Chignik, Alaska
                  495 miles SW of Anchorage, Alaska


FORECASTS OF TSUNAMI ACTIVITY
-----------------------------
 * Tsunami activity is forecasted to start at the following
   locations at the specified times.

                 FORECAST
                 START
SITE             OF TSUNAMI
----             ----------

 * Alaska
Sand Point       2255 AKDT Jul 28
Unalaska         2350 AKDT Jul 28
Kodiak           2355 AKDT Jul 28
Cold Bay         0010 AKDT Jul 29
Adak             0015 AKDT Jul 29
Seward           0020 AKDT Jul 29
Elfin Cove       0025 AKDT Jul 29
Sitka            0030 AKDT Jul 29
Yakutat          0030 AKDT Jul 29
Valdez           0040 AKDT Jul 29
Cordova          0050 AKDT Jul 29
Homer            0100 AKDT Jul 29
Saint Paul       0110 AKDT Jul 29


OBSERVATIONS OF TSUNAMI ACTIVITY
--------------------------------
 * No tsunami observations are available to report.


RECOMMENDED ACTIONS
-------------------
Actions to protect human life and property will
vary within tsunami warning areas and within tsunami
advisory areas.

If you are in a tsunami warning area;

 * Evacuate inland or to higher ground above and beyond
   designated tsunami hazard zones or move to an upper floor
   of a multi-story building depending on your situation.

If you are in a tsunami warning or advisory area;

 * Move out of the water, off the beach, and away from
   harbors, marinas, breakwaters, bays and inlets.

 * Be alert to and follow instructions from your local
   emergency officials because they may have more detailed or
   specific information for your location.

 * If you feel a strong earthquake or extended ground rolling
   take immediate protective actions such as moving inland
   and/or uphill preferably by foot.

 * Boat operators,
     * Where time and conditions permit, move your boat out to
       sea to a depth of at least 180 feet.

     * If at sea avoid entering shallow water, harbors,
       marinas, bays, and inlets to avoid floating and
       submerged debris and strong currents.

 * Do not go to the shore to observe the tsunami.

 * Do not return to the coast until local emergency officials
   indicate it is safe to do so.


IMPACTS
-------
Impacts will vary at different locations in the warning and
in the advisory areas.

If you are in a tsunami warning area;

 * A tsunami with damaging waves and powerful currents is
   possible.

 * Repeated coastal flooding is possible as waves arrive
   onshore, move inland, and drain back into the ocean.

 * Strong and unusual waves, currents and inland flooding
   can drown or injure people and weaken or destroy structures
   on land and in water.

 * Water filled with floating or submerged debris that can
   injure or kill people and weaken or destroy buildings and
   bridges is possible.

 * Strong and unusual currents and waves in harbors,
   marinas, bays, and inlets may be especially
   destructive.

If you are in a tsunami advisory area;

 * A tsunami with strong waves and currents is possible.

 * Waves and currents can drown or injure people who are
   in the water.

 * Currents at beaches and in harbors, marinas,
   bays, and inlets may be especially dangerous.

If you are in a tsunami warning or advisory area;

 * Some impacts may continue for many hours to days after
   arrival of the first wave.

 * The first wave may not be the largest so later waves may
   be larger.

 * Each wave may last 5 to 45 minutes as a wave encroaches
   and recedes.

 * Coasts facing all directions are threatened because the
   waves can wrap around islands and headlands and into bays.

 * Strong shaking or rolling of the ground indicates an
   earthquake has occurred and a tsunami may be imminent.

 * A rapidly receding or receded shoreline, unusual waves and
   sounds, and strong currents are signs of a tsunami.

 * The tsunami may appear as water moving rapidly out to sea,
   a gentle rising tide like flood with no breaking wave,
   as a series of breaking waves, or a frothy wall of water.


ADDITIONAL INFORMATION AND NEXT UPDATE
--------------------------------------
 * Refer to the internet site tsunami.gov for more information.

 * Pacific coastal residents outside California, Oregon,
   Washington, British Columbia and Alaska should refer to the
   Pacific Tsunami Warning Center messages at tsunami.gov.

 * This message will be updated within 30 minutes.

$$