USGS hydrologist Richard Alexander talks about the nine States that contribute to the majority of nutrients in the northern Gulf of Mexico, threatening the economic and ecological health of one of the Nation's largest and most productive fisheries.
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Nutrient Sources and Gulf of Mexico Hypoxia
USGS hydrologist Richard Alexander talks about the nine States that contribute to the majority of nutrients in the northern Gulf of Mexico, threatening the economic and ecological health of one of the Nation's largest and most productive fisheries.
TEB rootless shield flank failure
(January 26, 2008, 10:50:12 to 19:12:16) Perched lava ponds often formed atop the rootless shields built by the "Thanksgiving Eve Breakout" (TEB) lava flow. This movie shows the failure of the flank of a rootless shield on January 26, 2008, and the release of the lava contained within the perched lava pond at its summit.
(January 26, 2008, 10:50:12 to 19:12:16) Perched lava ponds often formed atop the rootless shields built by the "Thanksgiving Eve Breakout" (TEB) lava flow. This movie shows the failure of the flank of a rootless shield on January 26, 2008, and the release of the lava contained within the perched lava pond at its summit.
Rootless Shield Flank Collapse - July 21, 2007 Eruption (January 26, 2008)
Just after midnight on July 21, 2007, a new fissure eruption broke out on the eastern flank of the Pu'u 'O'o cone (http://hvo.wr.usgs.gov/pressreleases/pr07_21_07.html).
Just after midnight on July 21, 2007, a new fissure eruption broke out on the eastern flank of the Pu'u 'O'o cone (http://hvo.wr.usgs.gov/pressreleases/pr07_21_07.html).
Ancient Lake Cahuilla High Water Mark
Lake Cahuilla was an ancient freshwater lake in the Salton Trough of southern California. It covered parts of the Coachella, Imperial and Mexicali valleys and was formed when the Colorado River overflowed its banks or was diverted northwest by its own sediments, which temporarily blocked the flow to the Gulf of California (Sea of Cortez).
Lake Cahuilla was an ancient freshwater lake in the Salton Trough of southern California. It covered parts of the Coachella, Imperial and Mexicali valleys and was formed when the Colorado River overflowed its banks or was diverted northwest by its own sediments, which temporarily blocked the flow to the Gulf of California (Sea of Cortez).
CoreFacts: It's short on time and big on science.
CoreFacts: It’s short on time and big on science. CoreFacts is coming Feb 4th, 2008. Subscribe today!
CoreFacts: It’s short on time and big on science. CoreFacts is coming Feb 4th, 2008. Subscribe today!
Mud Volcano
A surface expression of geothermal activity.
A surface expression of geothermal activity.
Mud Volcano
A surface expression of geothermal activity.
A surface expression of geothermal activity.
Mud Volcano
A surface expression of geothermal activity.
A surface expression of geothermal activity.
The Unusual Suspects
Three scientists talk about lesser-known topics that were brought to light in the media in 2007 by the USGS Science Picks, including the loss of coastal wetlands, leaping carp, and evolutionary teamwork. We also preview CoreFacts, the quick science Q & A we'll offer every weekday starting February 4th.
Three scientists talk about lesser-known topics that were brought to light in the media in 2007 by the USGS Science Picks, including the loss of coastal wetlands, leaping carp, and evolutionary teamwork. We also preview CoreFacts, the quick science Q & A we'll offer every weekday starting February 4th.
Natural Bridges State Beach, Santa Cruz, California
Photograph of the coastal region of Natural Bridges State Beach in Santa Cruz, California
Photograph of the coastal region of Natural Bridges State Beach in Santa Cruz, California
Wildfire Woes for Things That Swim, Hop, Crawl, and Eat a Lot
Biologist Robert Fisher tells a troubling tale of how wildfire in Southern California has disrupted the lives of frogs, shrews, fish, and salamanders (despite the latter's mythical fondness of flame).
Biologist Robert Fisher tells a troubling tale of how wildfire in Southern California has disrupted the lives of frogs, shrews, fish, and salamanders (despite the latter's mythical fondness of flame).
Indiana Harbor Canal at East Chicago, IN - gage house
Indiana Harbor Canal at East Chicago, IN - gage house
Indiana Harbor Canal at East Chicago, IN - gage house
Various Karst Features Along Peace River, Fl
Observing the small amount of flow going into Dover Sink.
Observing the small amount of flow going into Dover Sink.
Various Karst Features Along Peace River, Fl
Inflow hole, left of staff gage, along the bottom wall of Dover Sink.
Inflow hole, left of staff gage, along the bottom wall of Dover Sink.
Wolf in Yellowstone National Park
Wolves were reintroduced to Yellowstone National Park in 1995 and 1996.
Wolves were reintroduced to Yellowstone National Park in 1995 and 1996.
Wolf in Yellowstone National Park
Wolves were reintroduced to Yellowstone National Park in 1995 and 1996.
Wolves were reintroduced to Yellowstone National Park in 1995 and 1996.
Wolf in Yellowstone National Park
Wolves were reintroduced to Yellowstone National Park in 1995 and 1996.
Wolves were reintroduced to Yellowstone National Park in 1995 and 1996.
A fire ecologist takes pictures of the location of the Red Eagle Fire.
A fire ecologist takes pictures of the location of the Red Eagle Fire in Montana, 2007.
A fire ecologist takes pictures of the location of the Red Eagle Fire in Montana, 2007.
A USGS scientist prepares a tracer solution in a gas-tight bladder
A USGS scientist prepares a tracer solution in a gas-tight bladder that will be pumped into a zone of nitrate-containing groundwater to monitor the production and consumption of nitric oxide dissolved in groundwater.
A USGS scientist prepares a tracer solution in a gas-tight bladder that will be pumped into a zone of nitrate-containing groundwater to monitor the production and consumption of nitric oxide dissolved in groundwater.
Bathymetry of southern Gulf of Maine and Massachusetts coastal zone
Bathymetry of of the southern Gulf of Maine with the Massachusetts coastal zone boundary outlined in grey.
Bathymetry of of the southern Gulf of Maine with the Massachusetts coastal zone boundary outlined in grey.
Bathymetry surrounding Martha's Vineyard, MA
Oblique hillshaded-relief view of the bathymetry surrounding Martha’s Vineyard and the Upper Cape looking south across Buzzards Bay and Vineyard Sound
Oblique hillshaded-relief view of the bathymetry surrounding Martha’s Vineyard and the Upper Cape looking south across Buzzards Bay and Vineyard Sound