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Delineating the Pierre Shale from geophysical surveys east and southeast of Ellsworth Air Force Base, South Dakota, 2021

The U.S. Geological Survey, in cooperation with the U.S. Air Force Civil Engineer Center, used surface-geophysical methods to delineate the top of Cretaceous Pierre Shale along survey transects in selected areas east and southeast of Ellsworth Air Force Base, South Dakota, from April to September 2021. Two complementary geophysical methods—electrical resistivity and passive seismic—were used along

December 12, 2022 — Mauna Loa Eruption Map

This reference map depicts the ongoing Mauna Loa eruption on Dec. 12, 2022.

December 11, 2022 — Mauna Loa Eruption Map

This reference map depicts the ongoing Mauna Loa eruption on Dec. 11, 2022.

December 10, 2022 — Mauna Loa Eruption Map

This reference map depicts the ongoing Mauna Loa eruption on Dec. 10, 2022

December 9, 2022 — Mauna Loa Eruption Map

This reference map depicts the ongoing Mauna Loa eruption on Dec. 9, 2022.

December 8, 2022 — Mauna Loa Eruption Map

This reference map depicts the ongoing Mauna Loa eruption on Dec. 8, 2022.

December 7, 2022 — Mauna Loa Eruption Map

This reference map depicts the ongoing Mauna Loa eruption on Dec. 7, 2022.

December 7, 2022 — Mauna Loa Northeast Rift Zone eruption fissure 3 lava flow thermal map

This reference map depicts the ongoing Mauna Loa eruption on Dec. 7, 2022.

December 6, 2022 — Mauna Loa Eruption Map

This reference map depicts the ongoing Mauna Loa eruption on Dec. 6, 2022.

December 5, 2022 — Mauna Loa Eruption Map

This reference map depicts the ongoing Mauna Loa eruption on Dec. 5, 2022.

December 5, 2022 — Thermal Maps Showing Evolution of Mauna Loa Fissure 3 Lava Flow

These maps show evolution of the lava flow from fissure 3 over 5 days. 

December 4, 2022 — Mauna Loa Eruption Map

This reference map depicts the ongoing Mauna Loa eruption on Dec. 4, 2022.