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In some regions, tsunami sirens are used to help alert the public. The Pacific Tsunami Warning Center (PTWC), located on Ford Island, Hawaii, is one of two tsunami warning centers in the United States, covering Hawaii, Guam, American Samoa and the Northern Mariana Islands in the Pacific, as well as Puerto Rico, the U.S. Virgin Islands and the British Virgin Islands in the Caribbean Sea.
The tsunami is known as the Hawaii April Fools' Day Tsunami because it happened on 1 April and many people thought it was an April Fool's Day prank. The result was the creation of a tsunami warning system known as the Pacific Tsunami Warning Center (PTWC), established in 1949 for the countries of Oceania. 1946: Nankai, Japan: 1946 Nankai earthquake
Hilo Bay is sometimes called "the tsunami capital of the United States". [7] The bay's topography steers tsunamis to Hilo from earthquakes in active areas such as Chile and the Aleutian Islands. [8] The April 1, 1946, tsunami from the 1946 Aleutian Islands earthquake killed by between 165 and 173 people in Hilo Bay. [9]
UTC time: 1946-04-01 12:29:01: ISC event: 898313: USGS-ANSSComCat: Local date: April 1, 1946 (): Local time: 02:29: Magnitude: 7.4 M s, 8.6 M w, 9.3 M t: Depth: 15 km (9.3 mi) [1] Epicenter: 1]: Type: Megathrust: Areas affected: Hawaii, Alaska United States: Max. intensity: MMI VI (Strong): Tsunami: Up to 42 m (138 ft) at Unimak Island: Casualties: 165–173 [2]: The 1946 Aleutian Islands ...
Tsunamis can occur when an underwater earthquake rapidly displaces massive amounts of water, leading to a large, long wave that builds in intensity as it crosses the ocean. When it reaches land it ...
The first rudimentary system to alert communities of an impending tsunami was attempted in Hawaii in the 1920s. More advanced systems were developed in the wake of the April 1, 1946 (caused by the 1946 Aleutian Islands earthquake) and May 23, 1960 (caused by the 1960 Valdivia earthquake) tsunamis which caused massive devastation in Hilo, Hawaii.
University of Hawaii Press, 1988, 1998, Tsunami! University of Hawai'i Press 1999, ... IOC Tsunami Glossary – International Tsunami Information Center
The event generated a large tsunami that was as high as 47 feet (14 m) on Hawaii'i island and was detected in Alaska, California, Japan, Okinawa, Samoa, and on Johnston and Wake Islands. Significant changes to the shorelines along the southern coast of the Big Island with subsidence of 12 feet (3.7 m) was observed, causing some areas to be ...