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 28, 2014, at 1:00 PM is shown in pink, while widening and advancement of the flow as mapped on October 29 at 11:30 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 flow advanced about 170 meters (185 yards) during the preceding 22.5 hours, traveling through private property. The flow was 215 meters (235 yd) upslope from Pāhoa Village Road at the time of mapping. A crudely mapped finger was also active just outside the same private property along the north side of the flow. Flow inflation over the past several days has lifted the flow surface higher than the old cane field berm just upslope from AP‘A‘ā Street. Two new breakouts from along the north edge of the flow started yesterday and overtopped the berm. Though not large, the more vigorous of the two breakouts was following the previously projected steepest-descent path that passes just east of the transfer station. 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: