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Metadata Identifier: gov.noaa.ngdc.mgg.photos:G01221

Aggregation Info | Bands | Citations | Constraints | Coverage Descriptions | Dimensions | Extents | Formats | Geographic Bounding Box
Georectified Information | Georeferenceable Information | Identifiers | Instruments | Mediums | OnlineResources | Operations
Platforms | Process Steps | Range Elements | Reference Systems | Responsible Parties | Series | Sources | Spatial Grids | Temporal Extents

MD_DataIdentification

Count Component Title Abstract
1 Volcanoes in Eruption - Set 1 The word volcano is used to refer to the opening from which molten rock and gas issue from Earth's interior onto the surface, and also to the cone, hill, or mountain built up around the opening by the eruptive products. This slide set depicts explosive eruptions, lava fountains and flows, stream eruptions, and fissure eruptions from 19 volcanoes in 13 countries. Volcano types represented in this set include strato, cinder cone, complex, fissure vent, lava dome, shield, and island-forming. Perhaps no force of nature arouses more awe and wonder than that of a volcanic eruption. Volcanoes can be ruthless destroyers. Primitive people offered sacrifices to stem the tide of such eruptions and many of their legends were centered around volcanic activity. Volcanoes are also benefactors. Volcanic processes have liberated gases of the atmosphere and water in our lakes and oceans from the rocks deep beneath Earth's surface. The fertility of the soil is greatly enhanced by volcanic eruptive products. Land masses such as islands and large sections of continents may owe their existence entirely to volcanic activity. The word "volcano" is used to refer to the opening from which molten rock and gas issue from Earth's interior onto the surface, and also to the cone, hill, or mountain built up around the opening by the eruptive products. The molten rock material generated within Earth that feeds volcanoes is called magma and the storage reservoir near the surface is called the magma chamber. Eruptive products include lava (fluid rock material) and pyroclastics or tephra (fragmentary solid or liquid rock material). Tephra includes volcanic ash, lapilli (fragments between 2 and 64 mm), blocks, and bombs. Low viscosity lava can spread great distances from the vent. Higher viscosity produces thicker lava flows that cover less area. Lava may form lava lakes of fluid rock in summit craters or in pit craters on the flanks of shield volcanoes. When the lava issues vertically from a central vent or a fissure in a rhythmic, jet-like eruption, it produces a lava fountain. Pyroclastic (fire-broken) rocks and rock fragments are products of explosive eruptions. These may be ejected more or less vertically, then fall back to Earth in the form of ash fall deposits. Pyroclastic flows result when the eruptive fragments follow the contours of the volcano and surrounding terrain. They are of three main types: glowing ash clouds, ash flows, and mudflows. A glowing ash cloud (nue ardente) consists of an avalanche of incandescent volcanic fragments suspended on a cushion of air or expanding volcanic gas. This cloud forms from the collapse of a vertical ash eruption, from a directed blast, or is the result of the disintegration of a lava dome. Temperatures in the glowing cloud can reach 1,000 deg C and velocities of 150 km per hour. Ash flows resemble glowing ash clouds; however, their temperatures are much lower. Mudflows (lahars) consist of solid volcanic rock fragments held in water suspension. Some may be hot, but most occur as cold flows. They may reach speeds of 92 km per hour and extend to distances of several tens of kilometers. Large snow-covered volcanoes that erupt explosively are the principal sources of mud flows. Explosions can give rise to air shock waves and base surges. Air shock waves are generated as a result of the explosive introduction of volcanic ejecta into the atmosphere. A base surge may carry air, water, and solid debris outward from the volcano at the base of the vertical explosion column. Volcanic structures can take many forms. A few of the smaller structures built directly around vents include cinder, spatter, and lava cones. Thick lavas may pile up over their vents to form lava domes. Larger structures produced by low viscosity lava flows include lava plains and gently sloping cones known as a shield volcanoes. A stratovolcano (also known as a composite volcano) is built of successive layers of ash and lava. A volcano may consist of two or more cones side by side and is referred to as compound or complex. Sometimes a violent eruption will partially empty the underground reservoir of magma. The roof of the magma chamber may then partially or totally collapse. The resulting caldera may be filled by water. The volcanic structure tells us much about the nature of the eruptions.
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SV_Identification

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CI_Citation

Count Component Title Date Citation Identifier
1 GCMD Data Center Keywords NASA/GCMD Data Center Keywords
    2015-03-01
    1995-04-24
1 NASA/GCMD Earth Science Keywords
    1 NASA/GCMD Location Keywords
      1 GCMD Project Keywords NASA/GCMD Project Keywords
        2015-03-01
        1995-04-24
      1 Volcanoes in Eruption - Set 1
        1994
      Document
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      CI_Series

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      CI_ResponsibleParty

      Count Component Individual Organization Position Email Role Linkage
      2 GCMD Valids http://gcmd.nasa.gov/learn/keyword_list.html
      1 Anna Milan Anna Milan DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce Metadata Specialist Anna.Milan@noaa.gov pointOfContact
      1 NCEI (publisher) DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce publisher
      1 NCEI User Services (distributor) DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce User Services ngdc.info@noaa.gov distributor
      3 Hazards Data Manager (pointOfContact) DOC/NOAA/NESDIS/NCEI> National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce Hazards Data Manager haz.info@noaa.gov pointOfContact
      1 DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce (comp) originator
      2 GCMD User Support Office NASA GCMD User Support Office gcmduso@gcmd.gsfc.nasa.gov publisher http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso
      1 National Geophysical Data Center publisher
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      CI_OnlineResource

      Count Component Linkage Name Description Function
      2 http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso GCMD Feedback Form Have a Comment for the GCMD? information
      2 http://gcmd.nasa.gov/learn/keyword_list.html GCMD's Science Keywords and Associated Directory Keywords This page describes the NASA GCMD Keywords, how to reference those keywords and provides download instructions. information
      1 http://www.ngdc.noaa.gov/hazard/
      2 http://www.ngdc.noaa.gov/nndc/struts/results?eq_1=28&t=101634&s=0&d=4&d=44
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      MD_Identifier or RS_Identifier

      Count Component Code
      1 Document
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      EX_Extent

      Bounding Box Temporal Extent
      Count Component Description West East North South Start End
      1 -155.29 175.6 63.3 -39.16 1915-03-22 1980-05-18
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      EX_GeographicBoundingBox

      Count Component West East North South
      1 -155.29 175.6 63.3 -39.16
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      EX_TemporalExtent

      Count Component Start End
      1 1915-03-22 1980-05-18
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      MD_Format

      Count Component Name Version specification
      2 TIFF
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      MD_Medium

      Count Component Name mediumFormat mediumNote
      1 cdRom iso9660
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      MD_Constraints

      Count Component Use Limitation
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      MD_ReferenceSystem

      none found
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      MD_GridSpatialRepresentation

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      MD_Georeferenceable or MI_Georeferenceable

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      MD_Georectified or MI_Georectified

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      MD_Dimension

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      MD_CoverageDescription or MI_CoverageDescription

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      MD_Band or MI_Band

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      MI_RangeElementDescription

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      MD_AggregateInformation

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      LE_Source or LI_Source

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      LE_ProcessStep or LI_ProcessStep

      Count Component DateTime Description
      1 2015-04-22T00:00:00 NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
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      MI_Operation

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      MI_Platform

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      MI_Instrument

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