In the German online version of Der Spiegel there is an article about superfast earthquakes. Researches have found that the devastating earthquake that took place on the 14th of April 2010 in the area of YUSHU in the province of QINGHAI in Southern China which was measured to 6.9 on the Richter scale, and which caused 2000 death and 10.000 wounded, had peculiarities of its own. Whereas previous theoretical work had shown that no earthquake wave could travel faster than 20.000 km/h, with the measured record being 18.000 km/h, this one was measured to travel at around 21.000 km/h (5 km/s), according to this abstract.
Anyone, who is familiar with highschool physics or has worked on figuring out the stopping length of a car in movement, might recall that the kinetic energy of a moving body is calculated from the expression 1/2*m*v^2. In other words 21.000 km/h is very fast and makes a moving body contain 10% more kinetic energy than had the speed been only 20.000 km/h and 36% more than if the speed had been a mere 18.000 km/h.
It is mentioned in the article that the suyperfast waves have characteristics in common with those shockwaves that are predicted to result from meteor impacts. Also it is pointed out that these superfast earthquake waves occur primarily in areas where tectonic plates slide along each other. Researchers have identified 26 metropolitan areas located near or on such dangerous fault lines.
Anyone, who is familiar with highschool physics or has worked on figuring out the stopping length of a car in movement, might recall that the kinetic energy of a moving body is calculated from the expression 1/2*m*v^2. In other words 21.000 km/h is very fast and makes a moving body contain 10% more kinetic energy than had the speed been only 20.000 km/h and 36% more than if the speed had been a mere 18.000 km/h.
It is mentioned in the article that the suyperfast waves have characteristics in common with those shockwaves that are predicted to result from meteor impacts. Also it is pointed out that these superfast earthquake waves occur primarily in areas where tectonic plates slide along each other. Researchers have identified 26 metropolitan areas located near or on such dangerous fault lines.