Ring of Fire
earthquakes over 4.0 from 1965 - 1985 : source USGS, map by Peter Schoppert
Indonesia lies at the conjunction of several plates, jostling with each other. Large subduction zones, where the Indian Ocean plate dives underneath Sundaland, are accompanied by volcanic activity in Sumatra and Java. More complex plate patterns are found in north Sulawesi, Halmahera and the Sanggihe Islands. The map above shows earthquakes stronger than on the 4.0 Richter scale, from 1945 to 1985. Major faults between plates show clearly as concentrations of earthquake activity.
This activity,and similar patterns along the edges of the Pacific Ocean, form the world's "Ring of Fire".
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