They can occur anywhere between the Earth's surface; about 700 kilometers<span> below the surface.</span>
Water covers 71 percent of the earth’s surface!
Increasing wavelength is an indication of a Doppler shift caused by an object moving away from the viewer. Longer wavelengths (of the visible spectrum) are redder, shorter wavelengths are bluer. Objects moving away from you have a red shift, objects moving toward you have a blue shift.
Earthquakes, faults, rifts valleys, and volcanoes
