ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
Seismographic world map. This map, centred on the Pacific and produced in 1857, shows the world's earthquake zones (orange). Areas of subsidence are blue, and volcanoes are marked as black dots. The seismic activity marks the active boundaries between the Earth's tectonic plates. The map, which overlaps at left and right, was produced by the Irish geologist Robert Mallet (1810-1881) and his son, US chemist John William Mallet (1832-1912). The map was produced using data from the British Association, and published in their report in 1858.
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