Flow front map at 1:5,000 scale

Flow front map at 1:5,000 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 31, 2014, at 12:25 PM is shown in pink, while widening and advancement of the flow as mapped on November 1 at 11:00 AM is shown in red. The dotted blue lines show steepest-descent paths in the area, calculated from a 1983 digital elevation model (DEM). The dominant breakout is that northeast of the Pāhoa cemetery. This breakout reconnected with the north edge of the flow on private land farther downslope, forming a kipuka. The breakout near the transfer station was also active, but had slowed considerably. The leading edge of the flow has not advanced since Thursday, October 30, 2014, and remains at 19.49590, -154.95256 (Decimal Degrees; WGS84). 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: