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The tsunami spread across the Pacific Ocean, with waves measuring up to 25 metres (82 ft) high in places. The first tsunami wave hit Hilo, Hawaii, approximately 15 hours after its origin. The highest wave at Hilo Bay was measured at around 10.7 m (35 ft). 61 people died, allegedly due to people not heeding the warning sirens.
At Sado Island, over 350 kilometres (217 mi; 189 nmi) away, a wave height of 2 to 5 metres (6 ft 7 in to 16 ft 5 in) has been estimated based on descriptions of the damage, while oral records suggest a height of 8 metres (26 ft). Wave heights have been estimated at 3 to 4 metres (9.8 to 13.1 ft) even as far away as the Korean Peninsula. [57]
The first tsunami wave surged up the Tagus estuary about an hour after the earthquake, reached a maximum runup of 12 meters (40 feet), and killed another 1000 people. At least two more tsunami waves surged into the city, completing the earthquake's destruction. At Portugal's coastal city of Lagos the tsunami was even larger, perhaps 30 m (100 ft).
When on-board software identifies a possible tsunami, the station leaves standard mode and begins transmitting in event mode. In standard mode, the station reports water temperature and pressure (which are converted to sea-surface height , not unlike a depth gauge or a pressure tide gauge ) every 15 minutes.
Amplitude, Wave Height, or Tsunami Height: Refers to the height of a tsunami relative to the normal sea level at the time of the tsunami, which may be tidal High Water, or Low Water. It is different from the crest-to-trough height which is commonly used to measure other type of wave height. [74]
This picture taken on March 11, 2011 shows tsunami waves hitting the coast of Minamisoma in Japan's Fukushima prefecture. - Jiji Press/AFP/Getty Images
Diagram of the 1958 Lituya Bay megatsunami showing the landslide movement, wave movement, and areas devastated by the wave with the use of arrows. Height of megatsunami, compared with Burj Khalifa, Empire State Building and Eiffel Tower (note: this is the run up height of the wave and not the height of the wave as it hit the shore).
Signs a tsunami is coming. The biggest indication that you should be on high tsunami risk alert is an earthquake while you’re on the coast. There are several ways to be prepared for a tsunami ...