Search results
Results from the WOW.Com Content Network
The tsunami magnitude scale, M t, is based on a correlation by Katsuyuki Abe of earthquake seismic moment (M 0 ) with the amplitude of tsunami waves as measured by tidal gauges. [62] Originally intended for estimating the magnitude of historic earthquakes where seismic data is lacking but tidal data exist, the correlation can be reversed to ...
The first scale that genuinely calculated a magnitude for a tsunami, rather than an intensity at a particular location was the ML scale proposed by Murty & Loomis based on the potential energy. [64] Difficulties in calculating the potential energy of the tsunami mean that this scale is rarely used.
A tsunami earthquake can be defined as an undersea earthquake for which the surface-wave magnitude M s differs markedly from the moment magnitude M w, because the former is calculated from surface waves with a period of about 20 seconds, whereas the latter is a measure of the total energy release at all frequencies. [2]
The earthquake produced its own aftershocks (some registering a magnitude of as high as 6.9 [40]) and presently ranks as the third-largest earthquake ever recorded on the moment magnitude or Richter scale. Other aftershocks of up to magnitude 7.2 [41] continued to shake the region daily for three or four months. [42]
In 1964, a massive 9.2 magnitude earthquake in Alaska resulted in a tsunami in Crescent City, California five hours later. The quake's epicenter was 1,600 miles from the town.
The estimated magnitude of the earthquake as 8.6 on the surface wave magnitude scale, has been taken from modelling of the tsunami. A source area of 200 kilometres (120 mi) long by 85 kilometres (53 mi) wide with a displacement of 2 metres (6 ft 7 in) is consistent with the observed distribution and degree of flooding. [5]
On 6 February 2013, an earthquake measuring 8.0 on the Moment Magnitude scale struck the island nation of the Solomon Islands. This earthquake created tsunami waves up to around one metre (3 ft 3 in) high. The tsunami also affected other islands such as New Caledonia and Vanuatu. 2014: Iceland: Askja: Landslide
Large tsunamis have occurred in the US and will again. A magnitude 9.2 earthquake in the Gulf of Alaska caused damage and loss of life along the West Coast in 1964. More than 150 tsunamis have ...