Last week I had an image of Toba, a volcano on the island of Sumatra in Indonesia (winner: Ron Schott from The Geology Home Companion). Toba had a colossal eruption 70-75,000 years ago which was probably the largest on Earth in the past several million years; even larger than the eruptions of the Yellowstone Caldera (last eruption 640,000 years ago). The volume of material from the Toba eruption was approximately 2800 km3, compared to 1.2 km3 from the 1980 eruption of Mt. St. Helens. The Toba event undoubtedly had a worldwide impact on climate and probably led the the extinction of many species in southern Asia.
This week: one more volcano. What volcano is this?
Grace and Peace
GeoChristian 
Moku’a-weoweo, the summit caldera of Mauna Loa Volcano
I’m having a sense of deja vu all over again… I just answered the same challenge (slightly different views) for Kim Hannula’s Geol 107 class Where on Google Earth extra credit #4. I trust you’re not one of Kim’s students, are you?
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When Ron Schott says “slightly different views,” he is certainly right. Kim Hannula and I both have two Google Earth images of the summit of Mauna Loa–one vertical and the other an oblique view in almost the same direction. But I’ve never heard of Kim Hannula, and I took intro geology in 1981, so all I can say is that Kim Hannula must have good taste in selecting views of volcanoes.
Kevin
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