Cerro Negro, which erupted in 1995, is the newest basaltic cinder cone to form in the western hemisphere. It has erupted about 20 times since 1850 and its eruptions usually produce fire bombs and lava flows. The cone rests on older lava flows which have been enlarged during earlier eruptions. The last eruption began with small bombs and ash shooting up from deep in the cone with some of it clearing the lip of the volcano in its typical Strombolian pattern. Eventually, the new cone which had been forming grew above the existing cone and lava flows began to creep down the sides of the old slope. Two of the flows reached as far as a kilometer and a half away from the volcano and 6,000 people were evacuated.
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