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As a pahoehoe flow spreads out across the ground, the flow surface cools and the majority of lava transport takes place through a series of tubes. In this view the leading edge of the flow field is advancing via a series of break-outs of lava from such a tube system. As can be seen from the scale bar in the image (which is marked in 5-centimeter increments), pahoehoe flows are much thinner than a’a flows, sometimes being only 30-50 centimeters thick. Photograph courtesy of P. Mouginis-Mark. Right click here to download a high-resolution version of the image (8.83 MB) |
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