Portal:Geophysics/Did you know/5

... that the World Digital Magnetic Anomaly Map depicts features such as the Richat Structure, Atlantic ridge, Paris Basin and Chicxulub crater (pictured)?
... that as rocks are compressed, sinking down into an oceanic trench, they release water that causes volcanoes to form above?
... that the North geomagnetic pole is not the same as the magnetic North Pole, and that a compass points at neither?
... that Suiyo Seamount, a seamount near Japan, was thought to be extinct until a hydrothermal event in 1991 was brought to light?
... that Karl Bernhard Zoeppritz was a German geophysicist whose equations use seismic waves to map underground features?