Home | Contact The Help Desk | Internet & Marketing Services
By Brittney Gordon For many, Halloween is one of the best holidays of the year. From the endless bags of candy to the costumes, it is the one night where adults and kids alike can pretend to be anyone they want to be, and have a lot of fun doing it. For weeks friends have asked [...]
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…
The U.S. Geological Survey WaterAlert service sends e-mail or text messages when certain parameters measured by a USGS data-collection station exceed user-definable thresholds. The development and maintenance of the WaterAlert system is supported through the USGS Cooperative Water Program , the USGS…
Scientists travel to Florida several times a year to collect samples. In the Everglades, peat cores are taken and modern pollen traps are set throughout the area. The cores are cut into 2cm pieces. Each piece is treated with strong chemicals in a lab to dissolve the remains of any organisms and to…
No. Probabilities are estimated from the rate of aftershocks and these are sometimes confused with the prediction of a particular event.
Earthquakes occur on faults - strike-slip earthquakes occur on strike-slip faults , normal earthquakes occur on normal faults , and thrust earthquakes occur on thrust or reverse faults. When an earthquake occurs on one of these faults, the rock on one side of the fault slips with respect to the…
Published maps will only provide generalized, uninterpreted information about specific areas. Every property consists of a unique combination of geologic and structural factors that must be considered to determine what might happen to a house during an earthquake. Therefore, an individual site study…
Please visit the Help for the National Atlas Map Maker page. If you still have questions, please contact us at atlasmail@usgs.gov .
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,…
Yes. The main body of subsurface water is found in the saturated zone of aquifers. Aquifers can be only a few feet below the surface or more than a thousand feet deep. Aquifers are the primary source of drinking water in arid and semi-arid parts of the United States where the amount of surface water…
Yes, customers will need to acquire at least 2 digital images from the same roll and then create transparencies or contact prints to view them stereoscopically.