(5) To determine the lower bound, we replaced height
differences that were less than 0 m or greater than 30 m with
0 m, both in the upper and lower parts of the flow. The
resulting volume estimate is 0.10 km^3
. For the upper bound,
we replaced negative height differences with 30 m (the
maximum plausible thickness) and obtained a volume
estimate of 0.19 km^3
. Therefore, the total volume of the
1991– 1992 lava flow is about 0.10 –0.19 km^3
.