GIS Data

The U.S. Geological Survey, in cooperation with the National Marine Sanctuary Program of the National Oceanic and Atmospheric Administration, has conducted seabed mapping and related research in the Stellwagen Bank National Marine Sanctuary (SBNMS) region since 1993. The area being mapped using geophysical and geological data includes the SBNMS and the surrounding region, which totals

Introduction The Emmons Lake volcanic center is a spatially clustered group of stratovolcanoes and calderas in the southwestern part of the Alaska Peninsula, Alaska. The volcanic center is characterized by several ice- and snow-clad stratovolcanoes located within and along the margins of a nested-caldera complex that includes Emmons Lake. A shieldlike ancestral edifice (ancestral Mount...

This map shows the tephra fall associated with episode 43 of Kīlauea's episodic summit eruption, on March 10, 2026. Tephra is a generic word for any material erupted by a volcano that travels through the air before landing on the ground.

Starting in the early 2000s, increasing oil and gas development in western North Dakota created a need for additional water resources from surface-water and groundwater sources near the North Unit of Theodore Roosevelt National Park. To summarize the use of water in that area, the U.S. Geological Survey, in cooperation with the National Park Service, developed a map of surface-water and

This reference map depicts the Kīlauea summit eruption within Halema‘uma‘u crater that began on December 23, 2024. As of this posting on March 2, 2026, the eruption has had forty-two episodes, with the most recent occurring on February 15.

These thermal maps at the summit of Kīlauea show the crater floor after episodes 41 and 42. Episode 41 produced a lava flow that covered much of the eastern crater floor, while episode 42 produced flows that stopped short of reaching the eastern edge of the crater floor.