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USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.

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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

Recent changes to Kīlauea’s East Rift Zone lava flow field.

By
Volcano Hazards Program, Hawaiian Volcano Observatory, Kīlauea

Map of Flow Field

Recent changes to Kīlauea’s East Rift Zone lava flow field.

By
Volcano Hazards Program, Hawaiian Volcano Observatory, Kīlauea

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. 

By
Volcano Hazards Program, Hawaiian Volcano Observatory, Mauna Loa

Map of Flow Field

Recent changes to Kīlauea’s East Rift Zone lava flow field

By
Volcano Hazards Program, Hawaiian Volcano Observatory, Kīlauea

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 conditions
By
Water Resources Mission Area, California Water Science Center

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 Mountains, the ic
By
Natural Hazards Mission Area, National Cooperative Geologic Mapping Program

January 24, 2018—26 years since last Mauna Loa eruption

26 years since last Mauna Loa eruption
By
Volcano Hazards Program, Hawaiian Volcano Observatory, Mauna Loa

January 24, 2018—Mauna Loa poses most serious threat to South Kona

Mauna Loa poses most serious threat to South Kona
By
Volcano Hazards Program, Hawaiian Volcano Observatory, Mauna Loa

January 05—Thermal map of flow field

This map shows a thermal map over the Episode 61g lava flow.

By
Volcano Hazards Program, Hawaiian Volcano Observatory, Kīlauea

Map of Flow Field

Recent changes to Kīlauea’s East Rift Zone lava flow field.

By
Volcano Hazards Program, Hawaiian Volcano Observatory, Kīlauea

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. 

By
Volcano Hazards Program, Hawaiian Volcano Observatory, 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.

By
Volcano Hazards Program, Hawaiian Volcano Observatory, Mauna Loa
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