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What do lava flows made of pahoehoe and a indicate about the type of volcanic eruption that occurd?
Wiki User
∙ 8y ago
The lava structures of a'a and pahoehoe indicate the viscosity (resistance to flow) and temperature of the lava as it was erupting. The pahoehoe structures form when the lava is more fluid and hotter and a thin crust is able to congeal before deformation by the heat of the interior of the flow. The a'a structures form when the lava is slightly cooler and less fluid as it travels downslope. A pahoehoe-forming lava can cool and become an a'a lava as it travels downslope, losing heat and becoming more viscous (less fluid).
It doesn't so much tell us about the eruption itself as it tells us about the temperature and viscosity of the lava.
Wiki User
∙ 13y ago
Wiki User
∙ 7y agoLava flows of pahoehoe and aa indicate that the eruption was effusive ("quiet") rather than explosive, or only very mildly explosive.
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