Item talk:Q243454

From geokb

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   "name": "Continuous gravity measurements reveal a low-density lava lake at K\u012blauea Volcano, Hawai\u2018i",
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   "abstract": "On 5 March 2011, the lava lake within the summit eruptive vent at K\u012blauea Volcano, Hawai\u2018i, began to drain as magma withdrew to feed a dike intrusion and fissure eruption on the volcano\u02bcs east rift zone. The draining was monitored by a variety of continuous geological and geophysical measurements, including deformation, thermal and visual imagery, and gravity. Over the first \u223c14 hours of the draining, the ground near the eruptive vent subsided by about 0.15 m, gravity dropped by more than 100 \u03bcGal, and the lava lake retreated by over 120 m. We used GPS data to correct the gravity signal for the effects of subsurface mass loss and vertical deformation in order to isolate the change in gravity due to draining of the lava lake alone. Using a model of the eruptive vent geometry based on visual observations and the lava level over time determined from thermal camera data, we calculated the best-fit lava density to the observed gravity decrease \u2014 to our knowledge, the first geophysical determination of the density of a lava lake anywhere in the world. Our result, 950 +/- 300 kg m-3, suggests a lava density less than that of water and indicates that K\u012blauea\u02bcs lava lake is gas-rich, which can explain why rockfalls that impact the lake trigger small explosions. Knowledge of such a fundamental material property as density is also critical to investigations of lava-lake convection and degassing and can inform calculations of pressure change in the subsurface magma plumbing system.",
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