MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Relationship between earthquakes and tectonic plate boundaries. Computer generated map of the world, showing the distribution of earthquakes of magnitude 5.5 or greater and depths of less than 50 kilometres in the period 1963-1987. The earthquake centres correlate very well with oceanic plate margins, particularly on the west coast of the Americas and around Africa. On land tectonic margins, for example north of India in the Himalayas and in the African Rift Valleys, the correlation is less evident.
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