HAWAIIAN VOLCANO OBSERVATORY DAILY UPDATE U.S. Geological Survey Tuesday, November 25, 2014 9:16 AM HST ACTIVITY SUMMARY: Kīlauea Volcano continues to erupt at its summit and within its East Rift Zone. Breakouts remain active in the upper part of the June 27th flow field and around the crack system near the abandoned geothermal well site. As of yesterday afternoon, the leading edge of the lowermost breakout was on the north and west margins of the earlier flow (now inactive), located about 5.7 km (3.5 mi) southwest of the transfer station on Apa`a St. Kīlaueas summit tilt has shown an overall deflationary trend in the past day. The level of the summit lava lake at Halemaʻumaʻu Crater lowered slightly in the past 24 hours. JUNE 27TH LAVA FLOW OBSERVATIONS: The lowermost breakouts from the crack system in and adjacent to the abandoned geothermal well site remain active. Since the breakouts from this part of the crack system started on November 19, the lava has moved 1.7 km (1 mi) downslope along the north and west margin of the original June 27th flow. As of yesterday afternoon, this new lobe was 5.7 km (3.5 mi) southwest of the transfer station on Apa`a St. Smaller breakouts were also active about 3.5 and 5.3 km (2.2 and 3.3 mi) downslope of Puʻu ʻŌʻō. The next HVO overflight is scheduled for Friday afternoon, weather permitting. PUU ʻŌʻō OBSERVATIONS: No significant changes were noted near Puʻu ʻŌʻō. Seismic tremor continued with relatively steady amplitude, and webcams revealed no strong variations in the pattern of glow from degassing vents nor the configuration of the crater floor. The tiltmeter at Puʻu ʻŌʻō showed little change in past 24 hours with no clear trend. The GPS-measured length across the cone has not changed significantly since July. The most recent measurement of sulfur dioxide emissions from the East Rift Zone was about 250 tonnes per day on November 18, 2014. SUMMIT OBSERVATIONS: During the past 24 hours the summit tiltmeter showed an overall deflationary tilt, but with a small inflationary tilt for a 4-hour period early last night; the tiltmeter has shown little change since about 6 am. The surface height of the lava lake in the Overlook vent has lowered slightly since yesterday morning. Volcanic tremor persisted at fluctuating amplitudes based on spattering activity in the lake. Small amounts of particulate material were carried aloft by the plume. Summit emissions of sulfur dioxide were measured at 4,400 tonnes/day on November 18.
Posted on: Tue, 25 Nov 2014 19:23:05 +0000
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