Data

This data release contains results of 6,000 simulations of volcanic ashfall from eruptions at Popocatépetl and Nevado de Teluca volcanoes in Mexico. From each model simulation, the deposit thickness was recorded at the location of a sediment core from Lake Chalco on the southeast edge of Mexico City (19.25718N, 98.97549W). These results are reported in the accompanying paper: Hodgetts, A...

Tiltmeter data from Kīlauea stations (ESC, IKI, JKA, KAE, POC, SDH, UWD) from January 1 to June 30, 2025. These data were collected in 2025 by Andria P. Ellis of the USGS Hawaiian Volcano Observatory.

Tephra samples from the Kulanaokuaiki Tephra Member (400 to 1000 C.E.) of the Uwēkahuna Ash (200 B.C.E. to 1000 C.E.) were sampled from Kīlauea volcano, Island of Hawai‘i. Samples were analyzed by dynamic imaging analysis using Microtrac CAMSIZER P4 and X2 instruments for grain shape and Anton nitrogen pycnometer instruments for density in the U.S. Geological Survey - Hawaiian Volcano...

This data release contains model input and postprocessed model output from a set of numerical simulations of hypothetical lahars initiated on Mount Baker, Washington. We constructed a set of landslide sources near the western summit of Mount Baker and simulated their initiation and downslope evolution into long-runout lahars in the Middle Fork of the Nooksack River. These simulations...

We present the results of 14C age analysis of samples collected during multiple projects that are part of an on-going, joint initiative of the U.S. Geological Survey Volcano Disaster Assistance Program and the El Salvador Ministerio de Ambiente y Recursos Naturales. These projects are part of a wider effort to better understand El Salvador’s many volcanoes and provide baseline data which...

This data release consists of well temperature logs from Long Valley Caldera, California, which have been measured to characterize the spatial and temporal variations of the subsurface heat flow. Two methods were used to measure temperatures. The first method, a portable hand cranked reel with a platinum resistance thermometer (PRT), with an accuracy and precision of 0.1 degrees Celsius...

The catastrophic, explosive eruption of Mount St. Helens, Washington, on May 18, 1980, is the most well-known eruption of the volcano. Less well known is that the May 18 eruption marked the beginning of a period of eruptive activity that lasted through 1986. Beginning in October 1980, a series of 17 dome-building episodes added millions of cubic meters of lava to the crater floor. Most...

Samples of the Mauna Loa 2022 eruption were collected throughout the 15 days of the eruption, and from all eruptive vents, by the U.S. Geological Survey. Emphasis was placed on obtaining water-quenched flow samples, spatter and volcanic bombs wherever possible. This was not possible for the early Moku‘āweoweo, Southwest Rift Zone and upper Northeast Rift Zone vents which erupted during...

The swath laser was tested at the large-scale experimental USGS debris flow flume facility as a potential tool for mass movement detection. The tests were conducted during gate release experiments, where a large volume of sediment was released from a hopper; and during natural release experiments, where a sediment prism was watered until wide-spread Coulomb failure occurred. During the...

The Goat Rocks volcanic cluster is a major andesitic locus in the southern Washington Cascade Range that persisted for approximately 3 million years (3.1 Ma to 115 ka) while coeval mafic volcanoes erupted on its periphery (Wall et al., 2018; Wall, 2022). The datasets presented in this data release were collected for a study that focuses on the mantle origin of the mafic magmas and their...

Aerial photography surveys of Iliamna Volcano and the Johnson River in Lake Clark National Park, Alaska, were conducted in late July and early August 2019 by fixed-wing aircraft to generate updated elevation data and high-quality orthoimagery. The surveys were flown by the National Park Service (NPS) Alaska Regional Office (AKRO) in partnership with the United States Geological Survey...

Tiltmeter data from Kīlauea stations (ESC, IKI, JKA, KAE, POC, SDH, SMC, UWE) from January 1 to December 31, 2023. These data were collected in 2023 by Andria P. Ellis of the USGS Hawaiian Volcano Observatory.