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By Administrator Lisa P. JacksonYesterday I was in Warwick Township and Lancaster County, Pennsylvania, a rural community that has been a model for resource conservation and sustainable economic growth. This was one of many visits EPA officials have made to connect with rural communities. I have had…
Go to the Natural Hazards Gateway , which includes: Earthquakes Floods Geomagnetism (solar flares, etc.) Hurricanes Landslides Seismic Zone Mapping Sinkholes Tsunamis Volcanoes Wildfires
Earthquake Lists.
Although it may seem that we are having more earthquakes, earthquakes of magnitude 7.0 or greater have remained fairly constant throughout this century and, according to our records, have actually seemed to decrease in recent years. A partial explanation may lie in the fact that in the last twenty…
An earthquake is caused by a sudden slip on a fault . The tectonic plates are always slowly moving, but they get stuck at their edges due to friction. When the stress on the edge overcomes the friction, there is an earthquake that releases energy in waves that travel through the earth's crust…
Wetlands have come under natural and human threats (from subsiding or sinking land to draining or filling for new development). Scientists estimate that the lower 48 United States have lost more than half of their wetlands since colonial times. Coastal wetlands especially have been seriously…
During the three giant caldera-forming eruptions that occurred between 2.1 million and 640,000 years ago, tiny particles of volcanic debris ( volcanic ash ) covered much of the western half of North America, likely a third of a meter deep several hundred kilometers from Yellowstone and several…
Lava and Lava Flows The temperature of basalt lava at Kilauea reaches 1,160 degrees Celsius (2,120 degrees Fahrenheit). -- USGS/VHP Website, 1998 The tube system (lava tubes) of episode 53 (Pu'u O'o eruption, Hawaii) carried lava for 10 kilometers (6 miles) from the vent to the sea. So…
Images record volcanic activity and provide a basis for comparison. Each observatory collects and archives their own images. Below is a list of image archives on the observatory sites. The AVO image database includes images of Alaskan volcanoes and Alaska research. It is searchable by keywords. …
Visit the USGS National Wildlife Health Center (NWHC) web pages at http://www.nwhc.usgs.gov/ . The National Wildlife Health Center was established in 1975 as a biomedical laboratory dedicated to assessing the impact of disease on wildlife and to identifying the role of various pathogens in…
The USGS provides access to water-resources data collected at approximately 1.5 million sites in all 50 States, the District of Columbia, and Puerto Rico. Online access to this data is organized around the categories listed to the left. The USGS investigates the occurrence, quantity, quality,…
River forecasts are made by the National Weather Service River Forecast Centers and released through local Weather Service Offices. The vast majority of current streamflow data used for these forecasts is obtained from U.S. Geological Survey stream-gaging stations, but USGS has no other…