In April 1960 a series of strong tectonic earthquakes took place in the vicinity of the Colo volcano on the island of Una-Una situated in the Gulf of Gorontalo, Central Sulawesi. Unlike that of 1898 these earthquakes were not followed by an eruption of the Colo volcano but only caused a slight incresase in temperature of the solfatara fields. Strong earthquakes were again felt in August 1982, g…
The tectonic concept known as seafloor spreading , global tectonics and also as plate tectonics began engulfing the geological community in the early sixties. Within less than a decade this unifying, geotectonic hypothesis beame widely known, and judging from the current literature, it has also been widely accepted.