|
| ||
|
| ||
|
January 4, 2009
Suicides in National Parks rise in 2008
UN condemns atrocities in DRC
|
Will
Yellowstone “supervolcano” trigger a major climate event?
Norris Geyser Basin, Yellowstone National Park
Time
magazine is reporting this week a story entitled “A Spurt of Quake Activity
Raises Fears in Yellowstone.” The park’s thermal features including hot
springs, mud pots, fumaroles and geysers create an atmosphere that would make
anyone wonder about the possibility of another “supervolcano” like the one that
exploded 642,000 years ago. Geologists believe that such an explosion would be
“1,000 times more powerful than the explosion of Mount St. Helens in 1980” and
“not only cover most of the U.S. with ash but also throw so much dust into the
atmosphere that the world's climate could change”.
Is North America and beyond threatened by a imminent eruption
of a Yellowstone supervolcano? To understand the situation more the
National Park Service has posted the following information on the situation on
the park’s website:
A: The
science of forecasting a volcanic eruption has significantly advanced over the
past 25 years. Most scientists think that the buildup preceding a catastrophic
eruption would be detectable for weeks and perhaps months to years. Precursors
to volcanic eruptions include strong earthquake swarms and rapid ground
deformation and typically take place days to weeks before an actual eruption.
Scientists at the Yellowstone Volcano Observatory* (YVO) closely monitor the
Yellowstone region for such precursors. They expect that the buildup to larger
eruptions would include intense precursory activity (far exceeding background
levels) at multiple spots within the Yellowstone volcano. As at many caldera
systems around the world, small earthquakes, ground uplift and subsidence, and
gas releases at Yellowstone are commonplace events and do not reflect impending
eruptions. A: Yes.
Scientists do not have any indication of an imminent eruption, or any eruption,
at this time. Q: What is park staff doing to monitor and
assess the probability of an eruption? A:
The YVO maintains an array of instruments that monitor activities at Yellowstone
around the clock. In addition, YVO scientists collaborate with scientists from
all over the world to study and assess the hazards of the Yellowstone volcano.
To learn more about Yellowstone's volcanic past and to view current data about
earthquakes, ground movement, and stream flow, visit the YVO website at
http://volcanoes.usgs.gov/yvo/. A: The
science of forecasting a volcanic eruption has significantly advanced over the
past 25 years. Most scientists think that the buildup preceding a catastrophic
eruption would be detectable for weeks and perhaps months to years. Precursors
to volcanic eruptions include strong earthquake swarms and rapid ground
deformation and typically take place days to weeks before an actual eruption.
Scientists at the YVO closely monitor the Yellowstone region for such
precursors. They expect that the buildup to larger eruptions would include
intense precursory activity (far exceeding background levels) at multiple spots
within the Yellowstone volcano. As at many caldera systems around the world,
small earthquakes, ground uplift and subsidence, and gas releases at Yellowstone
are commonplace events and do not reflect impending eruptions. Q: Is the volcano dormant or extinct or still
active? A: The
Yellowstone Volcano is still active. Evidence for the activity of the
Yellowstone Volcano are the 1,000 to 3,000 earthquakes per year, active ground
deformation, and the over 10,000 thermal features found in Yellowstone.
Q: What is Yellowstone doing to prevent an
eruption? A:
Nothing can be done to prevent an eruption. The temperatures, pressures,
physical characteristics of partially molten rock, and the immensity of the
magma chamber are beyond man's ability to influence--much less control.
Q: How will the park get the word out if there
is an eruption? A: The
park would communicate accurate and timely information to park visitors, park
employees, concessioners, surrounding communities, media outlets, and other
interested parties through the park's 24-hour Communications Center; news
releases; established emergency response programs; and through notification of
appropriate interagency, state and local government agencies.
Q: Where would it be safe to be during an
eruption? A:
For the most likely type of volcanic eruption in Yellowstone, everywhere would
be safe except in the immediate vicinity of the advancing lava flow. In the
highly improbable event of a large catastrophic eruption, the greater the
distance from the eruptive center, the safer it would be. It is impossible to
know the effects of the eruption without guessing at the explosivity of the
highly unlikely eruption and the total amount of the material erupted. Q: Would the public know about a possible
eruption? A:
Yes. Scientists continuously monitor volcano activity in Yellowstone and share
that information through news releases, web sites, etc. Current
real-time-monitoring data are online at
http://volcanoes.usgs.gov/yvo/monitoring.html.
|
United Nations Environmental Program The Year of Living Dangerously
Cyclone Nargis last June claimed 78,000 lives in Myanmar. The Atlantic hurricane season caused devastation in the Caribbean, Central America and the United States.
UNEP is leading the effort to develop standards on the development of the biofuel economy. The Roundtable on Sustainable Biofuels (RSB) has produced draft principles and criteria, currently open to a 6-month public comment period.
|