(ABOVE PHOTO) USGS Hawaiian Volcano Observatory captures a breakout of ropey pāhoehoe lava upslope of Apaʻa Street in this October 30th photo. The lava burned vegetation near the Pāhoa transfer station on Thursday afternoon.
(ABOVE VIDEO) Using audio from today’s media conference call, we present a lengthy look at the current flow activity, slowly moving through private property in Pahoa. Video taken from various sources.
- The lava flow has stalled 170 yards from Pāhoa Village Road (straight line distance), having advanced only about 33 yards over the past 24 hours. Still, the USGS Hawaiian Volcano Observatory warns “it is possible that the flow may advance again without warning.”
- Other lava breakouts warrant attention, in particular a new outbreak 110 yards downslope of the Pāhoa cemetery, along the northern margin of the flow in a forested area. Scientists say this breakout “is now the major locus of activity on the lower part of the June 27th lava flow field.”
- USGS is monitoring a DI deflation at the summit, which was accompanied by a drop in the level of the summit lava lake, which scientists say is typical for such events. Scientists addressed the DI deflation – and speculation that it could lead to the end of the lava flow – during Thursday’s conference call.
Scientists of the USGS Hawaiian Volcano Observatory conducted ground observations of the June 27th lava flow on Thursday, October 30, 2014. As of 5 PM, HST, the leading edge of the flow had stalled approximately 155 meters (170 yards) in a straight line distance from Pāhoa Village Road. The flow advanced only about 30 meters (33 yards) over the past 24 hours. The leading edge is inflated with a few small oozing breakouts just behind the flow front, however, so it is possible that the flow may advance again without warning.
A new outbreak of lava occurred from the northern margin of the lava flow in a forested area about 100 meters (110 yards) downslope (northeast) of the Pāhoa cemetery. This flow was moving downslope along the north margin of the existing flow as of 5 PM. This breakout is now the major locus of activity on the lower part of the June 27th lava flow field.
The breakout of lava on the north margin of the flow above Apa`a Street, near the Pāhoa transfer station, is still active, and the dominant part of the breakout was advancing at a rate of 7-8 meters (8-9 yards) per hour. This lobe was about 100 meters (110 yards) upslope of Apa`a Street at 5 PM.
DI deflation continued at the summit, having accumulated about 2.5 microradians of deflationary tilt since Wednesday afternoon. The deflation was accompanied by a several-meter (yard) drop in the level of the summit lava lake as is typical for such events. Deflation during DI events is often associated with a decrease in the eruption rate of lava from Puʻu ʻŌʻō, which may result in a decrease in the level of activity at the flow front in the coming days. An instrumental malfunction at the tiltmeter located on Puʻu ʻŌʻō is temporarily preventing an analysis of ground tilt there. USGS Hawaiian Volcano Observatory on Oct. 30 at 6:17 p.m.
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 29, 2014, at 11:30 AM is shown in pink, while widening and advancement of the flow as mapped on October 30 at 12:00 PM is shown in red. The latitude and longitude of the front of the narrow finger of lava advancing toward Pāhoa was 19.49590, -154.95256 (Decimal Degrees; WGS84). The dotted blue lines show steepest-descent paths in the area, calculated from a 1983 digital elevation model (DEM).
The flow advanced about 65 meters (70 yards) during the preceding 24.5 hours. At the time of mapping, the tip of the flow was stalled, but a few tiny oozing breakouts were active just upslope from the front. The tip of the flow was 155 meters (170 yards) from Pāhoa Village Road.
Surface activity also continues elsewhere on the flow. A new breakout occurred along the north margin of the flow about 100 m downslope from Pāhoa cemetery. The breakout was moving downslope along the north margin of the flow, and was active as of 6:30 PM. Another breakout was active along the north margin of the flow just above Apaʻa Street, and heading in a northeast direction. The actively advancing part of the breakout was 100 meters (110 yards) from Apaʻa Street.
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/. (see large map)USGS Hawaiian Volcano Observatory on Oct. 30 at noon