Let's connect @trevornace, © 2020 Forbes Media LLC. In addition, in 1964, plate tectonics was a just-emerging geological theory that the earth’s shell was composed of interlocking plates resembling a jigsaw puzzle, a concept bolstered when it was found that the cause of the Alaskan quake was not a vertical break in a fault, but an angled lunge forward. How long did the 2018 Alaska earthquake last? With the underground focus of the tremor just 25 miles below the surface, damaging waves reached the Alaska city of nearly 300,000 less than 13 seconds after the initial rupture. The first is the length of time it takes for the fault to rupture and the second is the length of time shaking is felt at any given point (e.g. Southern Alaska has had: (M1.5 or greater) 15 earthquakes in the past 24 hours 124 earthquakes in the past 7 days; 453 earthquakes in the past 30 days The tsunamis even caused damage as far away as Hawaii and Japan. This subduction between the two plates produces earthquakes, volcanoes, and mountains from Mexico to Alaska. Google Maps Late last night Alaska was struck with a magnitude 7.8 earthquake just off its coast, causing immediate concerns for tsunami risk. Shaking was felt across the peninsula as well as light shaking in Kodiak and Anchorage, 530 miles from the epicenter. Short video (4 min) by Stephen Wessells, USGS relating how the largest quake in U.S. history had profound and lasting impacts on our lives. It released at least twice as much energy as the San Francisco earthquake of 1906 and was felt on land over an area of almost 502,000 square miles (1,300,000 square km). Trees whipped so viciously that their tops touched the ground. The earthquake triggered a swell of devastating tsunamis, landslides and submarine slumps which caused massive property damage and loss of life. While there was an observed tsunami of just 0.8 feet, it was small enough and disseminated to not cause any potential threat to Alaska. On July 9, 1958, an earthquake with an estimated magnitude of 7.7-8.3 triggered an enormous rockfall in a remote bay along the Gulf of Alaska. According to the U.S. Geological Survey (USGS), the earthquake was as powerful as all subsequent American earthquakes combined and “so large that it caused the entire Earth to ring like a bell.” More than 1,000 miles away in Seattle, the Space Needle swayed from the vibration, and water-level recorders in every state except for Rhode Island, Delaware and Connecticut registered the quake. Groaning buildings buckled. The shock was the strongest ever recorded in the interior of Alaska. According to the USGS, the Great Alaska Earthquake caused over $300 million in damage ($2.3 billion in 2013 dollars) and took the lives of 131 people, 119 of those due to the tsunamis. The operators of the 800-mile (1,290-kilometer) long trans-Alaska pipeline said they shut the system down as a precaution following the earthquake in southcentral Alaska. You may opt-out by. Summary of the earthquake’s cause and effects from the Alaska Earthquake Information Center. We reported over 220,000 earthquakes in Alaska over the last five years. She says there is no known damage to the pipeline. Telephone poles snapped like matchsticks. Lasting four minutes and thirty-eight seconds, the magnitude 9.2 megathrust earthquake remains the most powerful earthquake recorded in North American history, and the second most powerful earthquake recorded in Due to the remote location, there were no fatalities and only a few injuries. HISTORY reviews and updates its content regularly to ensure it is complete and accurate. The 1964 Alaskan earthquake, also known as the Great Alaskan earthquake and Good Friday earthquake, occurred at 5:36 PM AKST on Good Friday, March 27. Officials issued, and later canceled, a tsunami warning for southern Alaska … Roads cracked like shattered peanut brittle. Geologists have now determined that the Pacific Plate pushes against the North American continent at the rate of 2.3 inches per year, and when the irresistible force finally overwhelmed the immovable object on Good Friday in 1964, it slid underneath the continental plate and violently unleashed centuries of pent-up energy in the Great Alaska Earthquake. That quake, which lasted for about 4½ minutes, was the most powerful earthquake recorded in U.S. history. The earthquake occurred just after 4:30 am local time along a previously undiscovered blind thrust fault in the San Fernando Valley. If there's one thing people expect to see out of Alaska other than salmon, it's great reality television! Felt like a very long quake!" Magnitude six and seven earthquakes can nearly happen anywhere in Alaska. Anchorage was severely damaged in March 1964 by the Great Alaska Earthquake, a 9.2-magnitude quake with its epicenter about 75 miles east of the city. Alaska has been hit with hundreds of aftershocks in the hours since the state was was rocked by a 7.0 magnitude earthquake on Friday. I am the founder of Science Trends, a leading source of science news and analysis on everything from climate change to cancer research. Click on a given earthquake to view the … While there was initially a tsunami warning, that warning was canceled by 12:30 a.m. Wednesday morning. This is the motion that triggers an earthquake-related tsunami. (Following the earthquake, towns such as Seward, Valdez and Chenega were moved to safer ground.). The earthquake epicenter was located southeast off the coast of the Aleutian Island chain 65 miles from Perryville, Alaska. But if you see something that doesn't look right, click here to contact us! A 7.5 magnitude earthquake struck off the Alaska Peninsula on Monday afternoon, triggering a tsunami … © 2020 A&E Television Networks, LLC. The duration of an earthquake is related to its magnitude but not in a perfectly strict sense. In 1964, Alaska suffered the strongest earthquake in U.S. history when a 9.2 rocked the state. Tidal waves killed 31 in Valdez along with 25 in Chenega, one-third of the small village’s population. The farther an earthquake originates offshore the more its waves dissipate before reaching land and thus damage is oftentimes dampened. Across south-central Alaska, ground fissures, collapsing structures, and tsunamis resulting from the earthquake caused about 131 deaths. A monster wave more than 200 feet tall knifed through the Valdez Inlet before slamming into the Alaskan coastline. What we know about the quake: A 7.0-magnitude earthquake rocked buildings in Anchorage on Friday morning. 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