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Alamagan Volcano - geochronologic points Alamagan Volcano is a Quaternary stratovolcano along the Mariana Arc, an active subduction zone in the western Pacific Ocean. Although primarily submerged, its peak reaches above sea level, with subaerially-exposed volcanic deposits dating back through the Holocene to the late Pleistocene. These feature data represent such deposits and other geologic features of Alamagan Volcano, describing its interpreted eruptive history. Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Alamagan Island, Andesite, GeochronPoints, Intermediate volcanic rock, Lava flow, All tags... Northern Islands, Northern Mariana Islands, Pacific, Pacific Islands, Pyroclastic rock, United States, Volcanic rock, geochronologic point, geologic maps, radiocarbon, radiocarbon point, radiocarbon sample, volcanic activity, Fewer tags Alamagan Volcano - cartographic lines Alamagan Volcano is a Quaternary stratovolcano along the Mariana Arc, an active subduction zone in the western Pacific Ocean. Although primarily submerged, its peak reaches above sea level, with subaerially-exposed volcanic deposits dating back through the Holocene to the late Pleistocene. These feature data represent such deposits and other geologic features of Alamagan Volcano, describing its interpreted eruptive history. Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Alamagan Island, Andesite, CartographicLines, Intermediate volcanic rock, Lava flow, All tags... Northern Islands, Northern Mariana Islands, Pacific, Pacific Islands, Pyroclastic rock, United States, Volcanic rock, annotation tie, cartographic line, geologic maps, map boundary, volcanic activity, Fewer tags Alamagan Volcano - map unit polygons Alamagan Volcano is a Quaternary stratovolcano along the Mariana Arc, an active subduction zone in the western Pacific Ocean. Although primarily submerged, its peak reaches above sea level, with subaerially-exposed volcanic deposits dating back through the Holocene to the late Pleistocene. These feature data represent such deposits and other geologic features of Alamagan Volcano, describing its interpreted eruptive history. Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Alamagan Island, Andesite, Intermediate volcanic rock, Lava flow, MapUnitPolys, All tags... Northern Islands, Northern Mariana Islands, Pacific, Pacific Islands, Pyroclastic rock, United States, Volcanic rock, geologic maps, geologic unit polygon, map unit polygon, volcanic activity, Fewer tags Digital database of the geologic map of Alamagan Volcano, northern Mariana Islands Alamagan Volcano is a Quaternary stratovolcano along the Mariana Arc, an active subduction zone in the western Pacific Ocean. Although primarily submerged, its peak reaches above sea level, with subaerially-exposed volcanic deposits dating back through the Holocene to the late Pleistocene. These feature data represent such deposits and other geologic features of Alamagan Volcano, describing its interpreted eruptive history. Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Alamagan Island, Andesite, Intermediate volcanic rock, Lava flow, NMI_Alamagan, All tags... Northern Islands, Northern Mariana Islands, Pacific, Pacific Islands, Pyroclastic rock, USGS Science Data Catalog (SDC), United States, Volcanic rock, Volcanology, geologic maps, volcanic activity, Fewer tags Colorimeter data for the summit water lake at Kīlauea Volcano, Island of Hawaiʻi, 2020 In 2018, a large effusive eruption on the lower flank of Kīlauea Volcano was associated with collapse and subsidence of the summit caldera floor (Neal and others, 2019). The bottom of Halemaʻumaʻu, a crater nested within the summit caldera, subsided by more than 500 m. In July 2019, water was observed ponding on the deepest part of the Halemaʻumaʻu crater floor and the water rose and enlarged in area steadily over the next 16 months (Ingebritsen and others, 2020; Nadeau and others, 2020; Patrick and others, 2021). During the course of the rise, the lake surface appearance was highly dynamic and segmented, showing regions of variable color that changed from day to day (Nadeau and others, 2020). In June 2020 staff... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Halemaʻumaʻu, Hydrology, Kīlauea Crater, Remote Sensing, USGS Science Data Catalog (SDC), All tags... Volcanology, colorimeter, crater lake, geoscientificInformation, hydrology, volcanic activity, volcano monitoring, volcanology, Fewer tags Sample details and near-real-time ED-XRF, grain size, and grain shape data collected during the November – December 2022 eruption of Mauna Loa volcano, Island of Hawaiʻi At 11:21 p.m. (Hawaii Standard Time [HST]) on November 27, 2022, Mauna Loa volcano on the Island of Hawaiʻi started erupting from fissures at its summit caldera, Mokuʻāweoweo. This was followed shortly afterwards by the opening of a segment of fissures in the direction of the Southwest Rift Zone. These were mostly within the structural boundary of the caldera, so their location is denoted as ‘South Caldera,’ with the exception of a short fissure that extended into the uppermost Southwest Rift Zone. By November 28, activity had shifted to four fissures that opened in the upper Northeast Rift Zone (Lynn and others, 2023). By December 2, eruptive activity was focused from Northeast Rift Zone fissure 3A supplying lava... Categories: Data; Tags: Chemical Analyses, Geochemistry, Grain Shape, Grain Size, Island of Hawaiʻi, All tags... Lava Flow, Mauna Loa, Tephra, USGS Science Data Catalog (SDC), Volcanic Activity, Volcanic Fissure, Volcano Monitoring, Volcanology, Volcanology, biota, Fewer tags Alamagan Volcano - geologic map shapefiles Alamagan Volcano is a Quaternary stratovolcano along the Mariana Arc, an active subduction zone in the western Pacific Ocean. Although primarily submerged, its peak reaches above sea level, with subaerially-exposed volcanic deposits dating back through the Holocene to the late Pleistocene. These feature data represent such deposits and other geologic features of Alamagan Volcano, describing its interpreted eruptive history. Tags: Alamagan Island, Andesite, GeologicMap, Intermediate volcanic rock, Lava flow, All tags... Northern Islands, Northern Mariana Islands, Pacific, Pacific Islands, Pyroclastic rock, United States, Volcanic rock, geologic maps, volcanic activity, Fewer tags Alamagan Volcano - data source polygons Alamagan Volcano is a Quaternary stratovolcano along the Mariana Arc, an active subduction zone in the western Pacific Ocean. Although primarily submerged, its peak reaches above sea level, with subaerially-exposed volcanic deposits dating back through the Holocene to the late Pleistocene. These feature data represent such deposits and other geologic features of Alamagan Volcano, describing its interpreted eruptive history. Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Alamagan Island, Andesite, DataSourcePolys, Intermediate volcanic rock, Lava flow, All tags... Northern Islands, Northern Mariana Islands, Pacific, Pacific Islands, Pyroclastic rock, United States, Volcanic rock, data source polygon, geologic maps, volcanic activity, Fewer tags Alamagan Volcano - contacts and faults Alamagan Volcano is a Quaternary stratovolcano along the Mariana Arc, an active subduction zone in the western Pacific Ocean. Although primarily submerged, its peak reaches above sea level, with subaerially-exposed volcanic deposits dating back through the Holocene to the late Pleistocene. These feature data represent such deposits and other geologic features of Alamagan Volcano, describing its interpreted eruptive history. Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Alamagan Island, Andesite, ContactsAndFaults, Intermediate volcanic rock, Lava flow, All tags... Northern Islands, Northern Mariana Islands, Pacific, Pacific Islands, Pyroclastic rock, United States, Volcanic rock, coastline, contact, fault, geologic maps, normal fault, topographic crater rim, volcanic activity, Fewer tags Alamagan Volcano - overlay polygons Alamagan Volcano is a Quaternary stratovolcano along the Mariana Arc, an active subduction zone in the western Pacific Ocean. Although primarily submerged, its peak reaches above sea level, with subaerially-exposed volcanic deposits dating back through the Holocene to the late Pleistocene. These feature data represent such deposits and other geologic features of Alamagan Volcano, describing its interpreted eruptive history. Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Alamagan Island, Andesite, Intermediate volcanic rock, Lava flow, Northern Islands, All tags... Northern Mariana Islands, OverlayPolys, Pacific, Pacific Islands, Pyroclastic rock, United States, Volcanic rock, geologic maps, hydrothermal alteration, overlay polygon, steam vent, volcanic activity, Fewer tags