Tsunami advisories ended for Hawaii, California after quake

Chile Earthquake Triggers Tsunami Warning

HONOLULU (AP) -- Tsunami advisories for Hawaii and California were dropped Thursday following a powerful earthquake off Chile, while minor effects were recorded along coasts as far north as Alaska.

The Pacific Tsunami Warning Center first issued a more serious tsunami watch for Hawaii shortly after Wednesday's magnitude-8.3 earthquake. Officials later downgraded that to an advisory, saying no major tsunami was expected in the state.

But they warned that sea-level changes and dangerous currents could pose a threat to those in or near the water.

Damage from the 8.4 magnitude earthquake:

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Chile 8.3 mag earthquake
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Tsunami advisories ended for Hawaii, California after quake
Homes are damaged in Concon, Chile, some 110 kilometers northwest of Santiago, on September 17, 2015 after a massive earthquake hit the area on September 16. A powerful 8.3-magnitude earthquake struck off Chile Wednesday, killing eight people, forcing the evacuation of a million and sparking warnings that tsunami waves could reach Japan. It was the sixth most powerful quake in the history of geologically volatile Chile and the strongest anywhere in the world this year, Deputy Interior Minister Mahmoud Aleuy said. AFP PHOTO/VLADIMIR RODAS (Photo credit should read VLADIMIR RODAS/AFP/Getty Images)
A local resident puts out her belongings to dry outside her home in Concon, some 110 km northwest of Santiago, on September 17, 2015 hit by an earthquake on the eve. A powerful 8.3-magnitude earthquake struck off Chile Wednesday, killing eight people, forcing the evacuation of a million and sparking warnings that tsunami waves could reach Japan. It was the sixth most powerful quake in the history of geologically volatile Chile and the strongest anywhere in the world this year, Deputy Interior Minister Mahmoud Aleuy said. AFP PHOTO/CLAUDIO REYES (Photo credit should read Claudio Reyes/AFP/Getty Images)
People recover their belongings in Concon, Chile, some 110 kilometers northwest of Santiago, on September 17, 2015 after a massive earthquake hit the area on September 16. A powerful 8.3-magnitude earthquake struck off Chile Wednesday, killing eight people, forcing the evacuation of a million and sparking warnings that tsunami waves could reach Japan. It was the sixth most powerful quake in the history of geologically volatile Chile and the strongest anywhere in the world this year, Deputy Interior Minister Mahmoud Aleuy said. AFP PHOTO/VLADIMIR RODAS (Photo credit should read VLADIMIR RODAS/AFP/Getty Images)
A collapsed structure in Concon, some 110 km northwest of Santiago, on September 17, 2015 hit by an earthquake on the eve. A powerful 8.3-magnitude earthquake struck off Chile Wednesday, killing eight people, forcing the evacuation of a million and sparking warnings that tsunami waves could reach Japan. It was the sixth most powerful quake in the history of geologically volatile Chile and the strongest anywhere in the world this year, Deputy Interior Minister Mahmoud Aleuy said. AFP PHOTO/CLAUDIO REYES (Photo credit should read Claudio Reyes/AFP/Getty Images)
Homes are damaged in Concon, Chile, some 110 kilometers northwest of Santiago, on September 17, 2015 after a massive earthquake hit the area on September 16. A powerful 8.3-magnitude earthquake struck off Chile Wednesday, killing eight people, forcing the evacuation of a million and sparking warnings that tsunami waves could reach Japan. It was the sixth most powerful quake in the history of geologically volatile Chile and the strongest anywhere in the world this year, Deputy Interior Minister Mahmoud Aleuy said. AFP PHOTO/VLADIMIR RODAS (Photo credit should read VLADIMIR RODAS/AFP/Getty Images)
A man wades through a flooded street littered with debris in Concon, some 110 km northwest of Santiago, on September 17, 2015 hit by an earthquake on the eve. A powerful 8.3-magnitude earthquake struck off Chile Wednesday, killing eight people, forcing the evacuation of a million and sparking warnings that tsunami waves could reach Japan. It was the sixth most powerful quake in the history of geologically volatile Chile and the strongest anywhere in the world this year, Deputy Interior Minister Mahmoud Aleuy said. AFP PHOTO/CLAUDIO REYES (Photo credit should read Claudio Reyes/AFP/Getty Images)
A woman walks over rubble next to a cemetery after an earthquake in Illapel, some 200 km north of Santiago on September 17, 2015. A powerful 8.3-magnitude earthquake struck off Chile on September 17, killing eight people, forcing the evacuation of a million and sparking warnings that tsunami waves could reach Japan. AFP PHOTO /MARTIN BERNETTI (Photo credit should read MARTIN BERNETTI/AFP/Getty Images)
Damages on a street of Concon, some 110 km northwest of Santiago, on September 17, 2015 hit by an earthquake on the eve. A powerful 8.3-magnitude earthquake struck off Chile Wednesday, killing eight people, forcing the evacuation of a million and sparking warnings that tsunami waves could reach Japan. It was the sixth most powerful quake in the history of geologically volatile Chile and the strongest anywhere in the world this year, Deputy Interior Minister Mahmoud Aleuy said. AFP PHOTO/CLAUDIO REYES (Photo credit should read Claudio Reyes/AFP/Getty Images)
Debris litter the coastal area in Concon, some 110 km northwest of Santiago, on September 17, 2015 hit by an earthquake on the eve. A powerful 8.3-magnitude earthquake struck off Chile Wednesday, killing eight people, forcing the evacuation of a million and sparking warnings that tsunami waves could reach Japan. It was the sixth most powerful quake in the history of geologically volatile Chile and the strongest anywhere in the world this year, Deputy Interior Minister Mahmoud Aleuy said. AFP PHOTO/CLAUDIO REYES (Photo credit should read Claudio Reyes/AFP/Getty Images)
Damaged houses in Concon, some 110 km northwest of Santiago, on September 17, 2015 hit by an earthquake on the eve. A powerful 8.3-magnitude earthquake struck off Chile Wednesday, killing eight people, forcing the evacuation of a million and sparking warnings that tsunami waves could reach Japan. It was the sixth most powerful quake in the history of geologically volatile Chile and the strongest anywhere in the world this year, Deputy Interior Minister Mahmoud Aleuy said. AFP PHOTO/CLAUDIO REYES (Photo credit should read Claudio Reyes/AFP/Getty Images)
Debris litters a beach in Concon, Chile, some 110 kilometers northwest of Santiago, on September 17, 2015, after a massive earthquake hit the area on September 16. A powerful 8.3-magnitude earthquake struck off Chile Wednesday, killing eight people, forcing the evacuation of a million and sparking warnings that tsunami waves could reach Japan. It was the sixth most powerful quake in the history of geologically volatile Chile and the strongest anywhere in the world this year, Deputy Interior Minister Mahmoud Aleuy said. AFP PHOTO/VLADIMIR RODAS (Photo credit should read VLADIMIR RODAS/AFP/Getty Images)
Homes are damaged in Concon, Chile, some 110 kilometers northwest of Santiago, on September 17, 2015 after a massive earthquake hit the area on September 16. A powerful 8.3-magnitude earthquake struck off Chile Wednesday, killing eight people, forcing the evacuation of a million and sparking warnings that tsunami waves could reach Japan. It was the sixth most powerful quake in the history of geologically volatile Chile and the strongest anywhere in the world this year, Deputy Interior Minister Mahmoud Aleuy said. AFP PHOTO/VLADIMIR RODAS (Photo credit should read VLADIMIR RODAS/AFP/Getty Images)
A man crosses a street next to a destroyed house after an earthquake in Illapel, some 200 km north of Santiago on September 17, 2015. A powerful 8.3-magnitude earthquake struck off Chile on September 17, killing eight people, forcing the evacuation of a million and sparking warnings that tsunami waves could reach Japan. AFP PHOTO /MARTIN BERNETTI (Photo credit should read MARTIN BERNETTI/AFP/Getty Images)
Women remain at a street during a strong quake in Santiago on September 16, 2015. A strong 7.2-magnitude earthquake struck the center of Chile on Wednesday, local seismologists said, triggering a tsunami alert, sparking panic and shaking buildings. AFP PHOTO /MARTIN BERNETTI (Photo credit should read MARTIN BERNETTI/AFP/Getty Images)
People remain outside a building during a strong quake in Santiago on September 16, 2015. A strong 7.2-magnitude earthquake struck the center of Chile on Wednesday, local seismologists said, triggering a tsunami alert, sparking panic and shaking buildings. AFP PHOTO /VLADIMIR RODAS (Photo credit should read VLADIMIR RODAS/AFP/Getty Images)
People remain outside a building during a strong quake in Santiago on September 16, 2015. A strong 7.2-magnitude earthquake struck the center of Chile on Wednesday, local seismologists said, triggering a tsunami alert, sparking panic and shaking buildings. AFP PHOTO /VLADIMIR RODAS (Photo credit should read VLADIMIR RODAS/AFP/Getty Images)
People remain outside a building during a strong quake in Santiago on September 16, 2015. A strong 7.2-magnitude earthquake struck the center of Chile on Wednesday, local seismologists said, triggering a tsunami alert, sparking panic and shaking buildings. AFP PHOTO /VLADIMIR RODAS (Photo credit should read VLADIMIR RODAS/AFP/Getty Images)
People leave a supermarket during a strong quake in Santiago on September 16, 2015. A strong 7.2-magnitude earthquake struck the center of Chile on Wednesday, local seismologists said, triggering a tsunami alert, sparking panic and shaking buildings. AFP PHOTO /MARTIN BERNETTI (Photo credit should read MARTIN BERNETTI/AFP/Getty Images)
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A 3-foot wave was recorded at Hilo Harbor on Hawaii's Big Island shortly after 4 a.m. Thursday, National Weather Service forecaster Tom Birchard said from his Honolulu office. He said he hadn't heard of any significant impacts.

Tsunami wave heights across Hawaii were below advisory levels and continued to diminish, the Pacific Tsunami Warning Center said in canceling the advisory.

"Small sea level changes and strong or unusual currents may persist for several additional hours in some coastal areas and appropriate caution should exercised by boaters and swimmers," the center said.

Tsunami effects also were felt along the coasts of California, Oregon, British Columbia and Alaska. King Cove, Alaska, reported water heights of 0.6 foot late Tuesday morning, the tsunami warning center said.

In California, a slight ocean surge and powerful currents were reported at points along the entire coast, scientists and local officials said.

Swimmers and surfers were warned of strong currents and urged to stay out of the water.

Ventura Harbor in Southern California experienced a 1.1-foot tsunami, while 0.4 foot heights were reported in San Diego to the south, and 0.8 foot heights were seen at Crescent City near the Oregon border, according to the National Tsunami Warning Center. Los Angeles-area beaches and harbor saw water level heights around a half-foot.

Boats were bobbing in Ventura Harbor, said harbormaster John Higgins.

"You'll see slow-moving streams coming in and going out, and at times the two converge upon each other and it creates turbulent water movement," he said.

The activity was "completely manageable" and not expected to have damaging effects, Higgins said.

The surge was expected to continue for several hours, with wave cycles every 20 minutes and heights topping out at around one foot, said Paul Whitmore, the tsunami center's director in Palmer, Alaska.

"It doesn't sound like much, but even a very small tsunami has a lot of power," he said.

Orange County beaches, harbors, piers and marinas were reopened at 6 a.m., but swimmers and boaters were warned that strong currents could continue.

A tsunami advisory was issued Wednesday evening for a 300-mile stretch of California, from south Orange County to Ragged Point about 50 miles northwest of San Luis Obispo. It was finally canceled early Thursday afternoon.

A tsunami warning was last issued for Hawaii in 2012, after a powerful earthquake off the coast of Canada. The Pacific Tsunami Warning Center lifted its tsunami advisory three hours after downgrading from a warning and less than six hours after the waves first hit the islands. The state was spared from severe surges.

Earthquake causes scary scene at a supermarket in Chile:

Chile Earthquake Slams Santiago Supermarket

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