Huat Ah 7.9 Quake Tsunami 2018 USA

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https://www.cnbc.com/2018/01/23/magnitude-8-point-2-quake-off-alaska-prompts-tsunami-warning.html


Tsunami alert issued for entire West Coast of US after 7.9 magnitude Alaska earthquake
Published 1 Hour Ago Updated 13 Mins AgoReuters

Brad Quick | CNBC
Juneau, Alaska.
A magnitude 7.9 earthquake hit the Gulf of Alaska in the early hours of Tuesday, prompting warnings of a possible tsunami down the Canadian and U.S. West Coast and as far away as Hawaii.

Local radio on the Alaskan island of Kodiak, close to the epicenter, urged listeners to move away from coastal areas.

"This is a tsunami warning. this is not a drill. Please get out to higher ground," said the announcer on KMXT public radio. "If you are on the flats, get up on one of the hills ... Just go high."

There were no immediate reports of damage or injury.

The U.S. Geologic Survey downgraded the quake. It was initially measured at magnitude 8.2, hit around 250 km (160 miles) southeast of Chiniak, Alaska at a depth of 25 km at 0931 GMT, the U.S. Geological Survey said.

"If you are located in this coastal area, move inland to higher ground. Tsunami warnings mean that a tsunami with significant inundation is possible or is already occurring," the Anchorage Office of Emergency Management said in a warning for Alaska and British Columbia.

A tsunami watch for the entire U.S. west coast and Hawaii were issued.

"Based on all available data a tsunami may have been generated by this earthquake that could be destructive on coastal areas even far from the epicenter," the Pacific Tsunami Warning Center said.

If a tsunami is generated, it could reach Hawaii by 4:23 a.m. (1423 GMT) at the earliest, it added.

Japan's meteorological agency said it was monitoring the situation but did not issue a tsunami alert.





This is breaking news. Please check back for updates.

—CNBC contributed to this report.

by Taboola
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https://www.nytimes.com/2018/01/23/us/earthquake-tsunami-alaska.html

U.S.
Alaska Earthquake Prompts Tsunami Warning


By GERRY MULLANY and AUSTIN RAMZYJAN. 23, 2018

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A magnitude 7.9 earthquake struck off the coast of Alaska early Tuesday. Credit United States Geological Survey, via European Pressphoto Agency
A major earthquake struck 170 miles off Alaska early Tuesday, prompting a tsunami warning along the coastline that urged people in affected areas to head to higher ground.

The magnitude 7.9 quake was reported at 12:31 a.m. local time in the Gulf of Alaska, according to the United States Geological Survey.

There were no immediate reports of damage.

The United States National Tsunami Warning Center issued a tsunami alert for areas that included the coast of Alaska to British Columbia and the border with Washington State, and a tsunami watch down to Mexico as well as in Hawaii.

The tsunami center said that the first place likely to be hit would be Kodiak, Alaska, at 1:45 a.m. local time followed by several coastal towns over the following two hours. A tsunami could hit Tofino, British Columbia, on Vancouver Island, around 4:40 a.m. Pacific Standard Time, and the northwest corner of Washington State around 4:55 a.m.

Tsunami sirens were reported to be going off in Kodiak after the earthquake.

“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,” the authorities warned on tsunami.gov. “Move out of the water, off the beach, and away from harbors, marinas, breakwaters, bays and inlets.”

The quake came nearly seven years after Japan was rattled by a 9.0 magnitude earthquake, the strongest ever recorded there. The earthquake set off a powerful tsunami that breached the sea walls of coastal towns, killing at least 15,000 people and sparking a major crisis at the Fukushima Daiichi Nuclear Power Station.

A 9.1 magnitude earthquake, one of the most powerful ever recorded, struck off the Indonesian island of Sumatra in December 2004, generating massive waves that killed more than 230,000 people across several countries, from Sri Lanka to India to southern Thailand.

 

[think_lees]

http://www.businessinsider.sg/tsuna...t-coast-after-82-earthquake-2018-1/?r=US&IR=T

10 metre wave recorded heading for Alaska after 7.9-magnitude quake triggers tsunami alert

Kieran Corcoran, Business Insider US
January 23, 2018
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A map showing the level of tsunami alerts around the quake. Red is “alert” level, yellow is the lesser “tsunami watch.”
US Tsunami Warning Center

• A powerful quake hit off the coast of Alaska in the early hours of Tuesday.
• Deep-sea buoys measured a spike in sea levels equivalent to a 10m wave.
• People in coastal Alaska were warned to flee inland or to high ground.
• The entire US west coast was put on “tsunami watch,” which is a lesser state of readiness than a tsunami alert.

Large waves have been detected headed for the coast of Alaska after a powerful earthquake struck off the coast.

Data from deep-sea buoys in the Gulf of Alaska detected a 10-metre displacement of water passing by in the period following a 7.9-magnitude tremor striking underneath the sea.

Other buoys also recorded unusually large movements, but of a lesser magnitude.

A graph showing water levels at buoy station 46410, off the coast of Alaska, in the wake of the earthquake.
National Data Buoy Center

People living in and around the coast of Alaska were told to leave their homes and to retreat to high ground. Evacuation sirens were sounding in affected areas, as police vehicles drove from house to house warning residents with loudspeakers.

Footage broadcast by Sky News showing an evacuation in progress in Alaska. The precise location was not specified.
Sky News



The state is sparsely populated in general. Many people do live on the coast, but the major population hub, Anchorage, is protected from tsunamis because it is not exposed to the open sea. Police have confirmed the city is safe.

The US Tsunami Warning System first alerted people in Alaska shortly before 1 a.m. local time after the quake struck.

According to the US Geological Survey, the earthquake hit 157 miles southeast of Chiniak, Alaska, at a depth of 25 km at 12.23 a.m. Alaska Standard Time (9.31 a.m. GMT). Its magnitude, initially reported as 8.2, was later revised down to 7.9.

Eleven more earthquakes, from magnitude 3.8 to 5.0, have been detected so far in the wake of the initial tremor.

A US Geological Survey map of the affected area. The large orange circle is the initial quake, the smaller ones are subsequent tremors.
US Geological Survey
Alaska and parts of Canada were given tsunami warnings, the highest level of alert. The western US coast was put on the lesser level of “tsunami watch,” according to the Reuters news agency.

People on social media posted screenshots of emergency warnings sent to their phones, telling them to “go to high ground or move inland”

A public warning from the Office of Emergency Management in Anchorage, Alaska’s biggest city, said:

“If you are located in this coastal area, move inland to higher ground. Tsunami warnings mean that a tsunami with significant inundation is possible or is already occurring. Tsunamis are a series of waves dangerous many hours after initial arrival time. The first wave may not be the largest.”

A map from the tsunami warning system, posted on Twitter, showed the travel times for any potential waves. According to their estimates, any tsunami would take at least three hours to strike the lower 49 states.

This story is developing.

@NWS_NTWC via Twitter

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‘Extraordinary threat to life’ after major quake offshore Alaska - state officials
Published time: 23 Jan, 2018 09:42 Edited time: 23 Jan, 2018 11:50
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© USGS
A tsunami warning has been issued for Alaska, with officials warning there is an “extraordinary threat to life or property” following the 7.9 magnitude earthquake in the early hours of Tuesday.
According to the US National Tsunami Warning Center, the earthquake occured 175 miles (281.6 km) southeast of Kodiak City in Alaska at a depth of 12 miles (19.3 km), sparking the alert.

The Kodiak Police Department shared a video on social media urging residents to evacuate. “This is not a drill,” Sgt Derek Beaver said, telling people to reach areas that are “100 feet or higher” above sea level.

“Harbour officers report water receding from our harbor,” the police wrote on Facebook. “Citizens should remain in place and wait for further updates.”

According to the Anchorage Office of Emergency Management, “A tsunami warning is now in effect which includes the coastal areas of British Columbia and Alaska from the Wash./BC border to Attu Alaska.”

“Tsunamis are a series of waves dangerous many hours after initial arrival time,” it said. “The first wave may not be the largest.”

A tsunami watch alert was also issued for the state of Hawaii, but has since been canceled. "Based on all available data there is no tsunami threat to the state of Hawaii,” the Pacific Tsunami Warning Center said. “The tsunami watch for Hawaii is now canceled."

Should a tsunami impact Hawaii, the first wave is estimated to arrive at 4:26 am HST (14:26 pm GMT). In Alaska, the estimated tsunami start time for Kodiak is 1:45 am AKST (10:45 am GMT).

Tsunami watches are also in effect in California from the California-Mexico border to the Oregon border, which includes San Francisco Bay, the National Weather Service warned.

According to the United States Geological Survey (USGS), earthquakes with a magnitude of 7.9 and above can cause, “destructive local tsunamis,” near the epicenter and, “sea level changes and damage may occur in a broader region.”

A tsunami watch alert is issued to areas outside of the warning zone, which, in the case of a quake over magnitude 7.5, is roughly three hours tsunami travel-time from the point of origin.

A tsunami warning means a significant wave is expected which could lead to coastal flooding and create powerful currents which can continue for hours after the first wave arrives. People in tsunami warning areas should evacuate to higher ground or inland to designated tsunami hazard zones.

Videos circulating on social media show people evacuating the community of Kodiak in Alaska, and tsunami warning sirens can be heard in the background.