Volcano Monitoring

Volcano Monitoring - Volcano Monitoring Courtesy of USGS To...

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Volcano Monitoring Courtesy of USGS To anticipate the awakening or reawakening of a volcano, volcanologists watch for changes caused by moving or pressurizing magma and associated changes in the hydrothermal system surrounding the magma. Magma moving toward the surface can cause swarms of earthquakes; swelling, subsidence, or cracking of the volcano's flanks; and changes in the amount or types of gases that are emitted from a volcano. The USGS continuously monitors many volcanoes in the states of Washington, Oregon, California, Hawaii, Alaska, and Wyoming (Yellowstone) to detect unusual activity. Q: Why is it important to monitor volcanoes? A: The United States and its territories contain 169 geologically active volcanoes, of which 54 volcanoes are a very high or high threat to public safety [ National Volcano Early Warning System (NVEWS) ]. Many of these volcanoes have erupted in the recent past and will erupt again in the foreseeable future. As populations increase, areas near volcanoes are being developed and aviation routes are increasing. As a result, more people and property are at risk from volcanic activity. Future eruptions could affect hundreds of thousands of people. To help prevent loss of life and property, the U.S. Geological Survey and its partners monitor these volcanoes, and issue warnings of impending eruptions. Monitoring active volcanoes allows scientists, public officials, and people in communities at risk to make preparations that can reduce losses during an eruption. Q: Why is monitoring volcanoes important to aviation? Most of the U.S. volcanoes can pose a serious hazard to domestic and/or international aviation. Below is a summary of KLM Flight 867, a Boeing 747 with more than 240 passengers aboard, that encountered ash from the 1989 eruption of Mt. Redoubt near Anchorage, Alaska. The ash encounter provides an example of how volcano monitoring is important to domestic and international aviation. The following account is summarized by Captain Terry McVenes, Executive Air Safety Chairman Air Line Pilots Association, International before the Committee on Commerce, Science, and Transportation Subcommittee on
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This note was uploaded on 10/15/2010 for the course CORC Core 3.32 taught by Professor Saveg during the Summer '09 term at CUNY Brooklyn.

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Volcano Monitoring - Volcano Monitoring Courtesy of USGS To...

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