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Video shows movement in Halemaumau Crater lava pond

From the USGS Hawaiian Volcano Observatory daily eruption update:

Tuesday, June 1 at Kilauea summit: The 60 by 90 m (200 X 300 ft) crusted, circulating, bubbling lava pond at the bottom of the deep collapse pit on the southeast edge of Halemaumau Crater, remained fairly stable except between 2 and 3 pm Tuesday when the lava surface rose to another high level (still more than 100 m, or 330 ft, below Halemaumau Crater floor); the surface appeared as bright jagged lines between slowly drifting crustal plates; bubbling was mostly concentrated at the southern (webcam left) edge where the lava sank out of sight. When weather permitted, glow from the vent was easily visible from the Overlook and in the HVO webcam overnight.

The temporary high lava stands are, in general, becoming higher and returning to higher base line levels. That is, what is considered the stable level from which the lava rises occur, has been slowly rising, too. Recent measurements by colleagues at Michigan Tech found that gas emissions decrease during the high stands, then spike as the lava drops before returning to pre-high stand emission values; this mimics the observation that the gas plume gets wispy during high stands and returns to substantial afterward. HVO measurements have shown that each high stand was accompanied by substantial decreases in seismic tremor and small decreases in ground tilt.

The summit tilt network recorded continued overall inflation with a total of 0.1 microradians of deflation during the high lava stand yesterday afternoon. The network of GPS receivers has been recording extension of the summit since early March, 2010. Seismic tremor levels were at elevated and fairly steady values except for a temporary decrease during the high lava stand. The number of RB2S2BL earthquakes remained within background levels. Five earthquakes were strong enough to be located beneath Kilauea volcano – one beneath the summit area, two beneath the upper east rift zone and two on south flank faults (one was offshore).

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