Solar flares produce seismic waves in the Sun`s interior that closely resemble those created by earthquakes on our planet. On May 27, 1998, researchers observed this flare-generated solar quake that contained about 40,000 times the energy released in the great earthquake that devastated San Francisco in 1906, equivalent to an 11.3 magnitude earthquake, scientists calculated. Over the course of an hour, the solar waves traveled for a distance equal to 10 Earth diameters before fading into the fiery background of the Sun`s photosphere. Unlike water ripples that travel outward at a constant velocity, the solar waves accelerated from an initial speed of 22,000 miles per hour to a maximum of 250,000 miles per hour before disappearing. (Courtesy of SOHO/EIT consortium. SOHO is a project of international cooperation between ESA and NASA)
