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As Hurricane Irene approaches land, please prepare carefully. Even if you’re not in the affected area, this week’s events are a good reminder to brush up on disaster preparedness.Here are some links to help you out.PreparingReady.gov: this is the best place for most people to start. Especially…
We generally emphasize the following four points: a) Select a coordinate system (also called a "position format") you feel comforatble using. We suggest using Universal Transverse Mercator (UTM) or latitude/longitude. Most users find UTM coordinates easier to locate on USGS…
Data about water use is only one kind of water data that USGS compiles. We also collect data about the country's surface water , such as how much water is flowing in our streams and rivers, and when a river reaches 'flood stage.' Ground water is studied -- the amount of water stored in…
Not specifically. Our charge is to understand characteristics of the earth, especially the earth's surface, that affect our Nation's land, water, and biological resources. That includes quite a bit of environmental monitoring. Other agencies, especially NOAA and NASA, are specifically funded…
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…
Surface rupture occurs when movement on a fault deep within the earth breaks through to the surface. NOT ALL earthquakes result in surface rupture.
This is an issue of great concern, as these populations are already struggling to survive in the current environment. If some of these species are more vulnerable to fatal WNV infection, WNV may ultimately lead to their extinction or significantly set back the progress of the recovery programs.
The U.S. aerospace industry would build the flight, launch, and ground segments as they have always done. In addition, U.S. companies are using Landsat data to build value-added products to sell in various markets. They rely on the USGS to provide an authoritative data product that they then use…
Coral reefs can be damaged by natural processes, such as storms, but they are increasingly at risk from human activities. Oil spills and pollutants can threaten entire reefs. Excessive nutrients from land sources, such as sewage and agricultural fertilizers, promote the growth of algae that can…
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,…
The GeoPDF 'Digital Map - Beta' file allows the user to interact with the map on a computer screen or print / plot the map on hard-copy media. Further information about using the GeoPDF format is available at the user's guide on http://nationalmap.gov/ustopo/ , or…