Filters: Tags: caldera (X) > Types: Map Service (X)

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Database for the Geologic Map of the Bonanza Caldera Area, Northeastern San Juan Mountains, Colorado The San Juan Mountains in southwestern Colorado have long been recognized as a site of exceptionally voluminous mid-Tertiary volcanism, including at least 24 major ignimbrite sheets (each 150-5,000 km3) and associated caldera structures active at 33-23 Ma. More recent volcanologic and petrologic studies in the San Juan region have focused mainly on several ignimbrite-caldera systems: the southeastern area (Platoro complex), western calderas (Uncompahgre-Silverton-Lake City), the central cluster (La Garita-Creede calderas). The northeast San Juan region that was far less studied until recently occupies a transition between earlier volcanism in central Colorado and the larger-volume younger ignimbrite-caldera foci... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: Bonanza, Colorado, North America, Saguache, USGS Science Data Catalog (SDC), All tags... United States, Volcanology, caldera, explosive eruptions, geology, geology, volcanoes, Fewer tags Digital elevation models and orthoimagery from the 2018 eruption of Veniaminof, Alaska Aerial photography surveys during and after the 2018 eruption of Veniaminof Volcano, Alaska were conducted to track the evolution of the lava flow field, active volcanic vent, and glacial ice loss from the eruption. Imagery from two surveys was processed with structure-from-motion (SfM) photogrammetric methods to derive the digital elevation models (DEMs) and orthophotos in this data release. The datasets cover the active volcanic cone and intracaldera ice cap, which both show significant topographic and groundcover change between surveys, and relative to previous topographic reference data, due to the 2018 eruption and variable snow and ice cover. A syn-eruption survey on September 26, 2018 was conducted by the... Types: GeoTIFF, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Raster; Tags: Alaska, Glaciology, Mount Veniaminof, Remote Sensing, Volcanology, All tags... aerial images, caldera, digital elevation model, glacier, lava flow, orthoimagery, scoria cone, structure-from-motion, volcanic eruption, volcano, Fewer tags USGS Yellowstone National Park Core Collection In 1967 and 1968 the USGS, in partnership with NASA and the National Park Service, extracted rock core from 13 locations in Yellowstone National Park. Depths of the holes ranged from 215 ft to 1,088 ft and the total drilled footage was 6,802 ft. The deepest hole was drilled in Norris Basin. Research on these cores provided critical understanding of complex geothermal systems that would inform the potential development of other systems, external to the park, as energy sources. These cores are extremely rare due to the many restrictions on sampling in the park. Years later, the cores were used to investigate the origin of some of Yellowstone supervolcano’s lavas using techniques that did not even exist when the cores... Categories: Collection, Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Collection, National Park Service, Yellowstone National Park, bulk crustal melting, caldera, All tags... completed, drilling, geochemistry, geothermal, hot springs, hydrothermal, hydrothermal alteration, ndc_collection, renewable energy, rhyolite, supervolcano, tectonics, uplift, Fewer tags NASA GIFT Iceland Highlands: 2019 and 2021 Askja Ground Penetrating Radar (GPR) and Observations This data collection includes ground-penetrating radar (GPR) data and related observations collected from the NASA Goddard Instrument Field Team (GIFT) Expedition to the Icelandic Highlands in July-August 2019 and August 2021. This dataset includes observations at the Askja Volcano and caldera and Vikrahraun lava flow. GPR data were collected using Geophysical Survey Systems, Inc (GSSI) shielded bistatic antennas at center frequencies of 200 MHz, 400 MHz, and 900 MHz. Common offset surveys were conducted to investigate the subsurface interfaces. The GPR data includes raw data obtained from the instrument (as GSSI .dzt files), line shapefiles of survey locations, and interpreted ice thickness GeoPackage files with... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Askja, Iceland, USGS Science Data Catalog (SDC), Volcanic ash, caldera, All tags... geophysics, geoscientificInformation, ground penetrating radar, intra-caldera, permafrost, pumice, pyroclastic, volcanology, Fewer tags Database for the geologic map of the central San Juan caldera cluster, southwestern Colorado This geodatabase contains all the geologic map information for the Geologic Map of the San Juan caldera cluster, southwestern Colorado and is part of U.S. Geological Survey Geologic Investigations Map Series I-2799. The San Juan Mountains are the largest erosional remnant of a composite volcanic field that covered much of the southern Rocky Mountains in middle Tertiary time. The San Juan field consists mainly of intermediate-composition lavas and breccias, erupted about 35-30 Ma from scattered central volcanoes (Conejos Formation) and overlain by voluminous ash-flow sheets erupted from caldera sources. In the central San Juan Mountains, eruption of at least 8,800 km3 of dacitic-rhyolitic magma as nine major ash... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: Andesite, Ash-flow tuff, Basalt, Central San Juan Caldera Cluster, Central San Juan Mountains, All tags... Colorado, Geochemistry, Gunnison, Lava flow, Pyroclastic rock, Rhyolite, San Juan, Tuff, USGS Science Data Catalog (SDC), United States, Volcanic breccia, Volcanology, Welded tuff, caldera, faulting (geologic), faulting (geologic), geoscientificInformation, volcanic activity, volcanic activity, volcanic eruptions, volcanic features, volcanic rocks, volcanic rocks, volcanology, volcanology, Fewer tags