Flow front map at 1:12,000 scale

Flow front map at 1:12,000 scale...

Detailed Description

This map uses a satellite image acquired in March 2014 (provided by Digital Globe) as a base to show the area around the front of the June 27th lava flow. The area of the flow on October 24, 2014, at 12:10 PM is shown in pink, while widening and advancement of the flow as mapped on October 25 at 5:00 PM is shown in red. The dotted blue lines show the pertinent steepest-descent paths, calculated from a 1983 digital elevation model (DEM). The flow advanced about 315 m (345 yd) during the past 29 hours, crossing AP‘A‘ā Street/Cemetery Road at about 3:50 AM this morning, and was about 80 m (260 ft) from the Pāhoa Cemetery at 5 PM. The flow was deflected away from the steepest-descent line it had been generally following, and toward the cemetery, by an old man-made cane-field berm just above AP‘A‘ā Street. The flow is advancing downslope between two intersecting steepest-descent paths and will likely return to the original steepest-descent path about 300 m (330 yd) upslope from Pāhoa Village Road, if it continues. Steepest-descent path analysis is based on the assumption that the DEM perfectly represents the earth's surface. DEMs, however, are not perfect, so the dotted blue lines can be used to infer only approximate flow paths. For calculation details, see http://pubs.usgs.gov/of/2007/1264/.


Image Dimensions: 3300 x 2550

Date Taken: