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In the Shoes of Tony Taylor: Results of Reinvestigation of the 1951 Eruption of Mount Lamington, Papua New Guinea

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In the Shoes of Tony Taylor: Results of Reinvestigation of the 1951 Eruption of Mount Lamington, Papua New Guinea In the shoes of Tony Taylor: results of reinvestigation of the 1951 eruption of Mount Lamington, Papua New Guinea Alexander Belousov1, Marina Belousova1,2, Herman Patia3, Richard Hoblitt4 1 - Earth Observatory of Singapore; 2 - Institute of Volcanology and Seismology, Russia; 3 - Rabaul Volcano Observatory, Papua New Guinea; 4 - Cascades Volcano Observatory, USA The 1951 eruption Studied by Tony Taylor (1958) Pre-climactic: strong seismicity, ground deformations, weak-mo- derate explosive activity (1 week) Climactic: On January 21 VEI 4 explosive Pelean type eruption Post-climactic: Dome growth and weak-moderate explosive activity (>2 years) Old photos courtesy of National Library of Australia The January 21, 1951 PDC Devastated area 230 km² Devastated: province capital Higaturu and 16 villages; ~ 3500 casualties Questions • What did explode? • What did trigger the January 21 explosion? • What was the character of the resulted pyroclastic density current? Cryptodome/dome intrusion during the pre-climactic stage January 18, 1951: “By midday …. a large hill built itself up between the hills at the foot of Lamington and the mountains in the rear. It was from the top of this hill that the ash was now issuing in terrific force, and flowing over the sides was a steamy white cloud which we could not distinguish even with a telescope, but it did not come more than about a third of the way down the newly built hill.” Mrs. Cowley What did explode? Taylor, 1958 Post-1951 dome 1982 1947 1951 Did the edifice of the volcano collapse? The 1951 debris avalanche V = 0.02-0.04 km³ L = 8.5 km H/L = 0.14 DA Landsat DA PF DA The 1951 debris avalanche deposit 2 km discovered on the old aerial photography Erupted material Juvenile particles >80% (poorly vesiculated andesite) Bezymianny 1956 30 20 10 0 St.Helens 1980 20 t n e c r 10 e P 0 Montserrat 1997 30 20 10 Belousov et al. 2007 The erupted magma was poorly vesiculated – 0 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 Density, g/cub.cm comparable to the 1997 blast of Montserrat 63 48 34 18 4 Vesicularity,% What was the character of the resulted pyroclastic density current? Location of points of detailed investigation The 1951 PDC stratigraphy One normally-graded/multiply-graded layer Lower part contains admixture of the substrate (soil) Layering common for deposits of directed blasts is not well-developed in the deposit of Mount Lamington. Proximal St. Helens Medial Distal The 1951 PDC of Mount Lamington Thickness/distance 100 Lamington 80 Mount St Helens 60 40 Thickness, cm Thickness, 20 0 3 5 7 9 11 13 15 17 19 21 23 25 Distance from crater, km The 1951 PDC of Mount Lamington Median diameter/distance 4 3 2 1 0 Lamington Median diameter, phi Median diameter, -1 Mount St Helens -2 3 5 7 9 11 13 15 17 19 21 23 25 Distance from crater, km The 1951 PDC of Mount Lamington Sorting/distance 4 Lamington 3.5 Mount St Helens 3 2.5 Sorting, phi 2 1.5 1 0.5 3 5 7 9 11 13 15 17 19 21 23 25 Distance from crater, km Lamington vs. St. Helens More symmetric area of devastation and less pronounced layering of the deposit Why? Mount Lamington, 1951 Mount St. Helens, 1980 The blast cloud of Lamington first ascended vertically before collapsing and producing a PDC. More dilute PDC? Position of magma in the moment of failure Blast No blast Failure surface does not intercept magma Lamington? Failure surface intercepts magma Belousov et al. 2007 Conclusions • Scenario of the 1951 eruption of Mount Lamington (cryptodome intrusion/edifice failure/blast), as well as the PDC dynamics are similar to those of directed blasts. • The existing differences (more symmetric area of devastation and less pronounced layering of the blast deposit) we attribute to the fact that the Lamington blast cloud first ascended vertically before collapsing and producing a PDC. Consequently the PDC of Lamington ingested more air and was more dilute than the “classic” blast-generated PDCs. Thank you!.
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