Armero colombia one month after a lahar killed more

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Armero, Colombia one month after a lahar killed more than 23,000 people on November 13, 1985.
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LAHAR-HUMAN INTERACTIONS © Jeffrey Marso, USGS geologist. Public Domain,
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VOLCANIC HAZARDS Keller et al ., 2015. Figure 5.26.
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VOLCANIC HAZARDS Bridge River vent, Mt. Meager, B.C. Vent created by an eruption 2400 years ago. © Willie Scott - Public Domain, https:// commons.wikimedia.org/w/index.php ? curid=10890877 unt_Meager#/media/File:Canada_Br itish _ Columbia_relief_location_map.jpg Nort h Mt. Meager
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LAHAR-HUMAN INTERACTIONS Example #2 Mt. Meager, British Columbia at least 54 eruptions have occurred at Mount Meager in the last 2,600,000 years eruptions associated with rock avalanches, ash fall, debris flows and lahars debris flows and lahars, mainly from Mount Meager, have filled Meager Creek valley to a depth of 250 m remains a major volcanic hazard capable of producing highly explosive
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DEBRIS FLOWS AND LAHARS Catto, 2015. Photo 3.17.
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DEBRIS FLOWS AND LAHARS Debris flow and lahar deposits, Lillooet Creek, B.C. © Willie Scott - Public Domain.
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LAHAR-HUMAN INTERACTIONS Pemberton, B.C., a community 65 km downstream from Mt. Meager, faces high risk ash fall, debris flows and lahars destroy forest and fishery resources mass movements will block Lillooet River and Meager Creek resulting in potentially catastrophic flooding potential road closures require evacuation of population sediment deposition within Lillooet River raising bed of the river; increased risk of flooding during periods of high rainfall
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DEBRIS FLOWS AND LAHARS 2010 Mt. Meager debris flow deposits. Keller et al ., 2015. Figure 6.23.
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MINIMIZING RISKS FOR PEMBERTON, B.C. monitor the volcano: remotely-sensed data to detect small ground movements that initiate mass movements (e.g., LiDAR) install a warning system: in situ sensors to detect mass movements; communities lack capacity to install and maintain an early warning system dredge Lillooet River channel: prevent overtopping of dykes that provide flood protection additional flood protection: raise level of dykes; raise levels of houses vulnerable to flooding
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LAHAR-HUMAN INTERACTIONS
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  • Fall '09
  • Stauffer
  • Geology

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