Tsunami Threat Lifted, Hawaii Coasts Still Dangerous

Hawaii and the Pacific Region Respond to a Major Earthquake

A powerful earthquake with a magnitude of 8.8 struck off Russia’s eastern coast, triggering tsunami warnings across the Pacific region. While a major tsunami was not expected to hit Hawaii, the event prompted widespread alerts and precautions across several coastal areas.

The Pacific Tsunami Warning Center, operated by the US National Weather Service, issued an update stating that based on all available data, a major tsunami would not impact Hawaii. However, they warned that all coasts could remain hazardous due to sea level changes, strong currents, and powerful waves. This caution extended to swimmers, boaters, and people near the shore.

Hawaii’s emergency management agency reported that evacuation orders had been lifted, and there were no significant damages reported. The tsunami warning for the state was downgraded to a tsunami advisory, indicating a reduced level of threat.

Wave Heights and Coastal Impact

The highest recorded waves in Hawaii reached up to 1.8 meters (6 feet). Tsunami warning sirens sounded in Honolulu on Tuesday evening, prompting the evacuation of some coastal areas. The US Coast Guard advised all boats to leave the port ahead of the tsunami's arrival, and airports were briefly shut down before being reopened.

The first waves hit the islands shortly after 8 pm local time. A gauge at Hanalei recorded a wave height of one meter (3 feet) above normal sea level. The Haleiwa gauge on Oahu’s North Shore measured a tsunami amplitude of 1.2 meters (4 feet) above normal sea level. Later readings showed waves as high as 1.7 meters above normal sea level.

While the height of the waves is a key factor in their destructiveness, other elements such as speed, volume of moving water, and the shape of the shoreline also play a role.

Regional Impacts and Warnings

The massive quake struck early on Wednesday morning in Russia, generating tsunami waves of up to 4 meters on the country’s east coast. This led to damage to buildings and prompted evacuation warnings in the region, as well as across most of Japan’s east coast.

The US tsunami warning system issued a warning of "hazardous tsunami waves," and a watch was in effect for the US island territory of Guam and other islands in Micronesia. However, the Pacific Tsunami Warning Center later stated that there was no further tsunami threat to Guam, Rota, Tinian, or Saipan. Japan’s Meteorological Agency also downgraded its tsunami warnings to advisories.

California and Other Coastal Areas

Parts of California’s coast remained under tsunami warnings and advisories on Wednesday morning. According to the National Tsunami Warning Center, tsunami warnings indicate that a tsunami with significant inundation is expected or occurring. These warnings suggest that widespread dangerous coastal flooding accompanied by powerful currents may continue for several hours after the initial wave arrival.

In Los Angeles, the National Weather Service reported a “rapid and damaging surge” at the Port San Luis gauge, where the tide went from low to high in just a few minutes. Crescent City, California, experienced waves as high as 8 feet, matching the area’s highest tides but not enough to cause flooding or damage in the downtown area.

Precautions and Community Response

Eric Wier, the city manager of Crescent City, which has faced numerous tsunamis over the last century, described the event as a long night for everyone involved. He noted that while there were significant tsunami surges, the situation remained within the banks of Elk Creek.

Officials advised residents to be cautious of dangerous currents throughout the day. Tsunami advisories were also in effect for parts of the coastal areas of Oregon, Washington, Alaska, and Canada’s British Columbia.

Governor's Statement and Public Actions

In Hawaii, Governor Josh Green mentioned that data from Midway Atoll, between Japan and Hawaii, measured tsunami waves from peak to trough of almost 6 feet. He also mentioned that Black Hawk helicopters and high-water vehicles were on standby in case of rescues, urging residents not to put themselves in harm’s way.

Green noted that officials observed water receding by as much as 30 feet at one Oahu harbor before the waves arrived. The tsunami alerts coincided with the Tuesday afternoon rush hour, causing traffic jams in Honolulu. Warning sirens blared as people moved to higher ground, leading to the cancellation of after-school and evening activities in Hawaii schools.

Gas stations near downtown Honolulu saw long lines, with standstill traffic even in areas away from the shoreline.

Resources and Updates

An up-to-date map of tsunami warnings, advisories, and watches can be found on the US tsunami warning system’s website.