Small-scale map of June 27th flow in Kīlauea's ERZ

This small-scale map shows the June 27th flow in Kīlauea's East Rift Zone in relation to lower Puna. The area of the flow on September 17, 2014, at 3:45 PM is shown in pink, while widening and advancement of the flow as mapped on September 19 at 11:45 AM is shown in red. The front of the active flow was 16.4 km (10.2 miles; straight-line distance) from the vent and 2.4 km (1.5 miles) upslope from Cemetery Road. The actual length of the flow, measured along the lava tube axis (so that bends in the flow are considered) was 18.7 km (11.6 miles).

The blue lines show down-slope paths calculated from a 1983 digital elevation model (DEM). For an explanation of down-slope path calculations, see: http://pubs.usgs.gov/of/2007/1264/. Down-slope path analysis is based on the assumption that the DEM perfectly represents the earth's surface. DEMs, however, are not perfect, so the blue lines on this map indicate approximate flow path directions. The purple arrow shows a short term projection of flow direction based on topography. All older Pu‘u ‘Ō‘ō lava flows (1983-2014) are shown in gray; the yellow line marks the lava tube.