Map of the 1859 Mauna Loa "paired" lava flow. The 'a'a flow (orange) was active for 16 days, advanced at an average flow-front velocity of 133 meters/hour, and erupted at a volumetric flow rate of 208 cubic meters/sec. The pahoehoe part (blue) followed immediately after, was active for 285 days, advanced at an average flow-front velocity of 7 m/hour, and was erupted at a volumetric flow rate of 5 cubic meters/sec (from Rowland & Walker 1990).

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