Maps and photos courtesy USGS
Helicopter pilot Pete Stachowitz
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OUT OF SITE
HAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE
Friday, July 22, 2016, 9:06 AM HST
19°25'16" N 155°17'13" W, Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE
Activity Summary: Eruptive activity continues at Kīlauea Volcano’s summit and East Rift Zone. The 61G lava flow extending southeast of Puʻu ʻŌʻō towards the ocean remains active but poses no threat to nearby communities. As of today, the flow tip was about ~760 m (0.5 miles) from the ocean. The lava lake at Halemaʻumaʻu Crater continues to circulate and intermittently spatter. Seismicity and deformation rates throughout the volcano remain at background levels.
Summit Observations: The lava lake within the Halemaʻumaʻu Overlook crater remains active. The depth to the lake was measured at 21.5 m (70 ft) below the crater rim, this morning. Tiltmeters at Kīlauea's summit recorded inflationary tilt. Seismicity is within normal, background rates with tremor fluctuations associated with lava lake spattering. The summit sulfur dioxide emission rate ranged from 3,700 to 7,300 metric tons/day.
Puʻu ʻŌʻō Observations: Webcam images over the past 24 hours show persistent glow at long-term sources within the crater. There were no significant changes in seismicity or tilt over the past 24 hours. The sulfur dioxide emission rate from all East Rift Zone vents on July 15 was about 270 metric tons/day.
Lava Flow Observations: The 61G lava flow extending southeast of Puʻu ʻŌʻō towards the coastal plain on Kīlauea's south flank remains active. On Friday, the flow tip was active and breakouts were active within a few hundred meters (yards) upslope. This morning, a field crew visited the flow field and noted the flow was approximately 615 m (0.4 miles) from the coastal emergency road and 760 m (0.5 miles) from the ocean; very little advance of the flow front. Areas of incandescence remain visible in overnight webcam views of the active lava flow field, marking lava tube skylights and areas of active lava on the pali and along the flow as it extends towards the coast.
This map shows recent changes to Kīlauea’s East Rift Zone lava flow field. The area of the active flow field as of July 8 is shown in pink, while widening and advancement of the active flow as mapped on July 19 is shown in red. Older Puʻu ʻŌʻō lava flows (1983–2016) are shown in gray.
The blue lines over the Puʻu ʻŌʻō flow field are steepest-descent paths calculated from a 2013 digital elevation model (DEM), while the blue lines on the rest of the map are steepest-descent paths calculated from a 1983 DEM (for calculation details, see http://pubs.usgs.gov/of/2007/1264/). 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 blue lines on this map can be used to infer only approximate flow paths. The base map is a partly transparent 1:24,000-scale USGS digital topographic map draped over the 1983 10-m digital elevation model (DEM).
The flow front remains active and is crossing the coastal plain.