Filters: Tags: {"scheme":"Lithologic classification of geologic map units"} (X) > partyWithName: Volcano Science Center (X) > partyWithName: Natural Hazards (X)

Filters Date Range Past year (1) Past month (0) Past week (0) Past day (0) Custom range... To   Search Extensions ArcGIS Service Definition (2) ArcGIS REST Service (1) Types ArcGIS REST Map Service (2) ArcGIS Service Definition (2) Downloadable (2) Map Service (2) OGC WFS Layer (1) OGC WMS Layer (1) OGC WMS Service (1) Contacts U.S. Geological Survey - ScienceBase U.S. Geological Survey Joel E Robinson Drew T Downs Liliana G Desmither More... Categories Data (3) Tag Types Theme (21) Tags (with Scheme=Lithologic classification of geologic map units) basalt (3) andesite (2) lava flow (2) rhyolite (2) volcanic ash (2) ash-flow tuff (1) caldera (1) More... View Results as: JSON ATOM CSV

Database for the geologic map of the Paeroa Fault block and surrounding area, Taupo Volcanic Zone, New Zealand The Taupo Volcanic Zone (TVZ), New Zealand, is the most productive area of explosive silicic volcanism in the world. Faulted early and middle Pleistocene volcanic products are generally concealed beneath voluminous, generally unfaulted, younger volcanic products. An exception is the southeast margin of the TVZ where the two parallel, northeast-trending Paeroa and Te Weta Fault blocks expose Quaternary volcanic products consisting predominantly of caldera-related, rhyolitic ignimbrites and lacustrine sediments. The Taupo-Reporoa Basin is situated along the eastern part of the map area, and its northernmost part underwent collapse to form Reporoa Caldera. The Paeroa Fault block is the largest exposed fault block within... Tags: New Zealand, North Island, Taupo Volcanic Zone, USGS Science Data Catalog (SDC), Volcanology, All tags... andesite, basalt, caldera, dacite, dome, geology, geoscientificInformation, ignimbrite, rhyolite, volcanism, Fewer tags Keanakākoʻi Tephra unit D, Kīlauea Volcano, Hawaii: sample details, grain size, and grain shape data for 100 tephra samples A total of 100 samples were collected from two proximal sections of Keanakākoʻi, Tephra unit D deposits. Samples were analyzed on Microtrac CAMSIZER® P4 and X2 instruments for grain size and shape data in the USGS Hawaiian Volcano Observatory (HVO) tephra lab. Data release includes sample descriptions, half phi grain size distributions, and statistical output from DECOLOG deconvolution modeling of grain size distributions. Grain size is reported using the sieve compatible Xcmin parameter (CAMSIZER® manual, 2020). Data of 2D shape parameter means of sphericity, Krumbein roundness and compactness of samples as well as for half phi grain size bins at 4, 3, 2, 1, 0, and -1 phi are also included. Please refer to associated... Categories: Data; Tags: Camsizer, Grain shape, Grain size, Hawaii Volcanoes National Park, Kīlauea Volcano, All tags... Kīlauea summit, Magma-water interaction, Phreatomagmatic, Sample information, Shape parameter, Tephra, Tephra deposit, USGS Science Data Catalog (SDC), Volcanic ash, Volcanic ash, Volcanology, geoscientificInformation, grain-size analysis, volcanic rocks, volcanology, Fewer tags Database for the geologic map of the northern Harrat Rahat volcanic field, Kingdom of Saudi Arabia The Harrat Rahat volcanic field, located in the west-central part of the Kingdom of Saudi Arabia, is the largest of 15 harrats (Arabic for 'volcanic field') hosted within the Arabian plate. Harrat Rahat is 50 to 75 km wide (east-west) and 300 km long (north-south), covering an area of approximately 20,000 square kilometers and encompassing more than 900 observable vents. The overall map area and its dataset show the volcanic geology of the northern part (about 3,340 square kilometers) of Harrat Rahat, at a scale of 1:75,000. Two additional map areas and their feature classes highlight areas of interest at 1:25,000 scale. Northern Harrat Rahat is of interest owing to the location of the city of Al-Madinah Al-Munawarah... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Al-Madinah Al-Munawarah, Basalt, Benmoreite, Harrat Rahat volcanic field, Lava flow, All tags... Mugearite, Saudi Arabia, Trachyte, USGS Science Data Catalog (SDC), geology, geoscientificInformation, volcanic activity, Fewer tags UAS video of the 2018 summit eruption of Kīlauea Volcano—May 1-31, 2018 This dataset contains Unoccupied Aircraft Systems (UAS) footage from the 2018 summit collapse of Kīlauea Volcano, Island of Hawai‘i. The intrusion of magma into Kīlauea’s lower East Rift Zone triggered draining of the summit lava lake and magma withdrawal from the shallow reservoir. This resulted in 62 subsequent collapse events at the summit between May and early-August 2018. Each collapse event released energy equivalent to a magnitude-5.3 earthquake. The total collapse volume was about 0.8 km^3, with subsidence of more than 500 m in some places. There are 73 UAS videos in this publication, recorded from May 19 to September 5, which have been separated into subpages by month. Sub-pages for each month also contain... Tags: Hawaii, Kilauea Crater, Volcanic ash, caldera, volcanic eruptions, All tags... volcanic gas emission, 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