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  2. Eastern Ruapehu Lahar Alarm and Warning System - Wikipedia

    en.wikipedia.org/wiki/Eastern_Ruapehu_Lahar...

    three geophones to detect the vibration of the collapse and from lahars; a buried tripwire to detect collapse of the dam; water level sensors to detect a sudden drop in lake level; Site 2 (NZ Alpine Club hut) two geophones to detect the vibration from passing lahars; Site 3 (near Tukino skifield) two geophones to detect the vibration from ...

  3. Mount Rainier Volcano Lahar Warning System - Wikipedia

    en.wikipedia.org/wiki/Mount_Rainier_Volcano...

    The Puyallup River Valley is at greatest risk. Tens of thousands of people live in areas that may have as little as 40 minutes to as much as three hours to move to safety once a large lahar is detected, so the system is robust, warnings are disseminated promptly and widely, and people in harm's way are taught how to respond to the warnings and ...

  4. Lahar - Wikipedia

    en.wikipedia.org/wiki/Lahar

    Lahars are predicted to flow through the valley every 500 to 1,000 years, so Orting, Sumner, Puyallup, Fife, and the Port of Tacoma face considerable risk. [18] The USGS has set up lahar warning sirens in Pierce County, Washington , so that people can flee an approaching debris flow in the event of a Mount Rainier eruption.

  5. Volcanic hazard - Wikipedia

    en.wikipedia.org/wiki/Volcanic_hazard

    The lahars can coat objects, wash objects away and can knock objects down by their force. Lahars, debris flows and mudflows that travel into a river or stream run the potential for crowding the waterway, forcing the water to flow outward and causing a flood. The volcanic matter could also pollute the water, making it unsafe to drink. [citation ...

  6. United Nations Office for Disaster Risk Reduction - Wikipedia

    en.wikipedia.org/wiki/United_Nations_Office_for...

    The World Summit on Sustainable Development (WSSD) in Johannesburg, South Africa, noted that “an integrated, multi-hazard, inclusive approach to address vulnerability, risk assessment and disaster management, including prevention, mitigation, preparedness, response and recovery, is an essential element of a safer world in the twenty- first ...

  7. Armero tragedy - Wikipedia

    en.wikipedia.org/wiki/Armero_tragedy

    The lahars on the map did not have a distinct ending point, and the main threat seemed to be from pyroclastic flows, not from mudflows. Though the map was colored blue, green, red, and yellow, there was no key to indicate what each color represented, and Armero was located in the green zone, wrongly interpreted to indicate the safest area. [ 20 ]

  8. Disaster risk reduction - Wikipedia

    en.wikipedia.org/wiki/Disaster_risk_reduction

    Mitigation is often used interchangeably with risk reduction, however the terms have a few key differences. Both aim to reduce the number of negative effects of hazards, but risk reduction focuses on reducing the likelihood of the event itself, while mitigation focuses on reducing the impact of the event. [14]

  9. Osceola Mudflow - Wikipedia

    en.wikipedia.org/wiki/Osceola_Mudflow

    Detailed map of Mount Rainier's summit and northeast slope showing upper perimeter of Osceola collapse amphitheater (hachured line) The Osceola Mudflow, also known as the Osceola Lahar, was a debris flow and lahar in the U.S. state of Washington that descended from the summit and northeast slope of Mount Rainier, a volcano in the Cascade Range during a period of eruptions about 5,600 years ago.