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  2. 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.

  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. Decade Volcanoes - Wikipedia

    en.wikipedia.org/wiki/Decade_Volcanoes

    A volcano may be designated a Decade Volcano if it exhibits more than one volcanic hazard (people living near the Decade Volcanoes may experience tephra fall, pyroclastic flows, lava flows, lahars, volcanic edifice instability and lava dome collapse); shows recent geological activity; is located in a densely populated area (eruptions at any of ...

  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. 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.

  7. 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 ...

  8. Volcanic tsunami - Wikipedia

    en.wikipedia.org/wiki/Volcanic_tsunami

    A wide variety of volcanic processes can produce tsunamis. This includes volcanic earthquakes, caldera collapse, explosive submarine eruptions, the effects of pyroclastic flows and lahars on water, base surges with accompanying shock waves, lava avalanching into the sea, air waves from explosive subaerial eruptions, avalanches of cold rock, and avalanches of hot material. [1]

  9. Debris flow - Wikipedia

    en.wikipedia.org/wiki/Debris_flow

    These natural levees form when relatively mobile, liquefied, fine-grained debris in the body of debris flows shoulders aside coarse, high-friction debris that collects in debris-flow heads as a consequence of grain-size segregation (a familiar phenomenon in granular mechanics). Lateral levees can confine the paths of ensuing debris flows, and ...