flow map produced previously (Dean et al., 2002), we then
classified the lava flow areas as 1991–1992 flow, 1964
flow, or pre-1964 flow. Fourth, in areas where the Landsat-7
imagery and radar imagery do not agree, we delineated the
lava flows by visual inspection. Fifth, in areas where the
lava flows are covered by snow and ice, radar imagery
provided the sole information for mapping the extent of the
flows. The final map of areal distributions of the 1991–
1992, 1964, and pre-1964 lava flows is shown in Figs. 1(d)
and 2. Our estimates of the flow areas are 8.4, 9.2, and 7.3