'In this case, three minutes - and I've been in a 9 in Japan - three minutes is an eternity,' said Goldfinger. The Cascadia could deliver a huge 9.0-magnitude quake and the shaking could last anything from three to five minutes, scientists claim. 'Then it generates a tsunami at the same time, which the side-by-side motion of the San Andreas can't do'. 'Cascadia can make an earthquake almost 30 times more energetic than the San Andreas to start with,' Chris Goldfinger, a professor of geophysics at Oregon State University told CNN. The coastlines are all mapped with blue points at first, to represent normal sea level.Īs the tsunami waves reach them, the points will change colour to indicate the height of the incoming waves. Wavelengths as well as height are indicated by colour. Using the earthquake information, the RIFT model shows movement, and predicts the speed, wavelength, and amplitude of the waves. Researchers call this a RIFT model, Real-Time Forecasting of Tsunamis. The animation from the Pacific Tsunami Warning Center, an effort by the National Oceanic and Atmospheric Administration and the National Weather Service, shows the real time path of the earthquake waves through the ocean, and what happens when the resulting tsunami waves hit land. The trees all died in the winter of 1699-1700, and the Pacific Northwest from Northern California to Washington suddenly sank up to 6 feet, flooding the area with seawater. The researchers analysed sediment deposits and the ‘ghost forests’ of drowned trees, along with historical records from Japan and the oral histories of Native Americans, according to the PTWC.Ĭomparing the tree rings of dead trees with those still living allowed scientists to pinpoint the date of the last devastating earthquake. Scientists have finally traced the origins of this ‘orphan tsunami’ to a powerful seismic event in the Pacific Northwest of the United States, along the Cascadia Subduction Zone. The historical tsunami struck the coasts of Japan just before midnight on January 27, 1700.
0 kommentar(er)
