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USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Our programs produce accurate geologic maps and 3-D geologic frameworks that provide critical data for sustaining and improving the quality of life and economic vitality of the Nation. They also organize, maintain, and publish the geospatial baseline of the Nation's topography, natural landscape, built environment and more.
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Map of Flow Field Map of Flow Field
Recent changes to Kīlauea’s East Rift Zone lava flow field.
February 15, 2018—Why are HVO scientists talking so much about Mauna Loa? February 15, 2018—Why are HVO scientists talking so much about Mauna Loa?
Mauna Loa, Earth's largest active volcano, has erupted 33 times since 1843, producing the lava flows shown in black.
Map of Flow Field Map of Flow Field
Recent changes to Kīlauea’s East Rift Zone lava flow field
Maps showing predicted probabilities for selected dissolved oxygen and dissolved manganese threshold events in depth zones used by the domestic and public drinking water supply wells, Central Valley, California Maps showing predicted probabilities for selected dissolved oxygen and dissolved manganese threshold events in depth zones used by the domestic and public drinking water supply wells, Central Valley, California
The purpose of the prediction grids for selected redox constituents—dissolved oxygen and dissolved manganese—are intended to provide an understanding of groundwater-quality conditions at the domestic and public-supply drinking water depths. The chemical quality of groundwater and the fate of many contaminants is influenced by redox processes in all aquifers, and understanding the redox...
Quaternary sediment thickness and bedrock topography of the glaciated United States east of the Rocky Mountains Quaternary sediment thickness and bedrock topography of the glaciated United States east of the Rocky Mountains
Beginning roughly 2.6 million years ago, global climate entered a cooling phase known as the Pleistocene Epoch. As snow in northern latitudes compacted into ice several kilometers thick, it flowed as glaciers southward across the North American continent. These glaciers extended across the northern United States, dramatically altering the landscape they covered. East of the Rocky...
January 24, 2018—26 years since last Mauna Loa eruption January 24, 2018—26 years since last Mauna Loa eruption
26 years since last Mauna Loa eruption
January 24, 2018—Mauna Loa poses most serious threat to South Kona January 24, 2018—Mauna Loa poses most serious threat to South Kona
Mauna Loa poses most serious threat to South Kona
January 05—Thermal map of flow field January 05—Thermal map of flow field
This map shows a thermal map over the Episode 61g lava flow.
Map of Flow Field Map of Flow Field
Recent changes to Kīlauea’s East Rift Zone lava flow field.
Map of post-1823 lava flows erupted from Mauna Loa Map of post-1823 lava flows erupted from Mauna Loa
Slope map of Mauna Loa, including lava flows erupted since 1823 (gray), showing the approximate number of hours or days it took for a flow to advance from the vent location to the ocean or maximum reach of a flow.
2012—Island of Hawai‘i map, showing Mauna Loa 2012—Island of Hawai‘i map, showing Mauna Loa
Island of Hawai‘i map, showing Mauna Loa and the other four volcanoes that make up the island. Mauna Loa structural features include summit caldera, rift zones, radial vents, and historical lava flows.
Earthquakes at Mauna Loa from June 2013 to June 2015 Earthquakes at Mauna Loa from June 2013 to June 2015
Earthquakes at Mauna Loa from June 2013 to June 2015. Green circles are 0-5 km (0-3 mi) deep and similar to ones prior to 1975 and 1984 eruptions, but cluster of 5-10 km (3-6 mi) deep quakes missing.