Can two volcanoes erupt at the same time?

There are a few historic examples of simultaneous eruptions from volcanoes (or volcanic vents) located within about 10 kilometers (6 miles) of each other, but it's difficult to determine whether one eruption caused the other. Volcanoes that share common magma reservoirs can sometimes trigger unrest at each other.



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Rising gradually to more than 4 km (2.5 mi) above sea level, Hawaii's Mauna Loa is the largest active volcano on our planet. Its submarine flanks descend to the sea floor an additional 5 km (3 mi), and the sea floor in turn is depressed by Mauna Loa's great mass another 8 km (5 mi).

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The largest dormant volcano in the world, Haleakala, makes up a large part of Maui. Mount Haleakala is also called the East Maui Volcano. Haleakala is considered a dormant volcano because it has not erupted in a long time, but it could erupt again in the future. Haleakala is a huge shield volcano.

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