gov.noaa.ngdc.mgg.photos:G01222
eng; USA
utf8
dataset
NOAA National Centers for Environmental Information
Hazards Data Manager
haz.info@noaa.gov
pointOfContact
2018-09-27
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Volcanic Rocks and Features
1994
publication
First
Document
NOAA National Centers for Environmental Information
publisher
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce (comp)
originator
National Geophysical Data Center
Boulder
CO
publisher
Volcanoes have contributed significantly to the formation of the surface of our planet. Volcanism produced the crust we live on and most of the air we breathe. The remnants of an eruption reveal as much as the eruption itself, for they tell us many things about the eruption. Included here are examples of several volcanic products and other magmatic features, with descriptions of how they were formed and what they tell us about volcanism. Most volcanic rock material begins as molten rock material formed within Earth and is called magma. Eruptive products include lava (fluid rockmaterial) and pyroclastics or tephra (fragmentary solid or liquid rock material). Tephra includes volcanic ash, lapilli (fragments between 2 and 64 mm), blocks, and bombs. Perhaps the best known volcanic product is lava, the fluid rock material that flows rather quietly from volcanic vents. The external and internal structures of lava flows are the result of the physical properties of the magma from which it was derived. Of these physical properties viscosity is the most important and it is in turn affected by the temperature and chemical composition of the magma. Lavas of low viscosity can spread great distances from the vent. Greater viscosity produces thicker lava flows that generally cover less area. The rate of supply of magma relative to the velocity of the lava as it flows from the vent and the external environment through which the lava flows also affect the structure of the solidified lava. Products of explosive eruptions include pyroclastic (fire broken) rocks and rock fragments. The force that produces explosive eruptions is the release of trapped gas. Ejecta from these explosions may be derived from the magma or from rocks in the vicinity of the volcanic conduit that are blasted out in the eruption. 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 (nuee ardente), ash flows, and mudflows. 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. The erosion of volcanoes leaves volcanic remnants, interesting reminders of the volcano's former fury. Erosion of the layers of lava and ash that built the volcano leaves the congealed magma in the conduit. This feature, sometimes referred to as a plug or the volcanic neck or throat, is a dramatic pillar of rock rising above the surrounding plain. These plugs or necks may be composed partially of fragments of the walls of the pipe and partially of congealed magma. They may be as more than a kilometer in diameter. Magma flowing into cracks in the rocks produces dikes, sills and laccoliths. This intrusive rock is generally resistant to erosion and often remains after the surrounding rock has eroded away. These exposed intrusive rocks give us a glimpse of the complex underground network of piping in active volcanoes. These igneous features are constant reminders of the timelessness of the processes that relentlessly form, and reform, the surface of planet Earth.
Make available Damage Photos for research and education
Patricia Lockridge
completed
NOAA National Centers for Environmental Information
Hazards Data Manager
haz.info@noaa.gov
pointOfContact
notPlanned
https://www.ngdc.noaa.gov/hazard/icons/small_res/29/29_585.jpg
Contraction during cooling of thick, extrusive basaltic lava flows causes cracks perpendicular to the cooling surface, which form the polygonal columns of the Devil's Postpile in California. The columns average about 46 cm across. In thic,k slowly cooled flows, the joints normal to the flow surface tend to develop in three directions at roughly 60 degrees to each other and form multi-sided blocks that are cut off by the joints parallel to the flow surface. Jointing of this sort may attain a high degree of regularity. The horizontal joints divide the columns into a series of segments. Such columnar jointing is found in all types of lava flows, including ash flows. It is also conspicuous in dikes and other intrusions.
JPEG
EARTH SCIENCE > SOLID EARTH > Volcanoes > Eruption Dynamics
EARTH SCIENCE > SOLID EARTH > Volcanoes > Lava
EARTH SCIENCE > SOLID EARTH > Volcanoes > Magma
EARTH SCIENCE > SOLID EARTH > Volcanoes > Pyroclastics
EARTH SCIENCE > SOLID EARTH > Volcanoes > Volcanic Ash/Dust
theme
NASA/GCMD Earth Science Keywords
INFOTERRA > Lithosphere > Seismic activity > Seismic activity
INFOTERRA > Lithosphere > Volcanoes > Volcanoes
theme
INFOTERRA Keyword Thesaurus
ICSU-WDS > International Council for Science - World Data System
project
Global Change Master Directory (GCMD) Project Keywords
2020-01-09
publication
9.1
NASA Goddard Space Flight Center, Earth Science Data and Information System
https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords
Global Change Master Directory (GCMD) Keywords
The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords.
information
custodian
Global
place
NASA/GCMD Location Keywords
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
dataCentre
Global Change Master Directory (GCMD) Data Center Keywords
2020-01-09
publication
9.1
NASA Goddard Space Flight Center, Earth Science Data and Information System
https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords
Global Change Master Directory (GCMD) Keywords
The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords.
information
custodian
otherRestrictions
otherRestrictions
Access Constraints: None Use Constraints: None Distribution Liability: While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
Container Packet ID
G01143
eng; USA
geoscientificInformation
-157.49
170.58
-45.06
64.17
Publication Date
TIFF
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
User Services
303-497-6826
303-497-6513
325 Broadway
Boulder
CO
80305-3328
USA
ngdc.info@noaa.gov
8am-5pm, Monday through Friday
distributor
25500
https://ngdc.noaa.gov/hazardimages/
https://www.ngdc.noaa.gov/hazard/
cdRom
iso9660
repository
NOAA National Centers for Environmental Information
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.
2015-04-22T00:00:00
This metadata was automatically generated from the Content Standard for Digital Geospatial Metadata: Extensions for Remote Sensing Metadata standard version FGDC-STD-012-2002 using the June 2011 version of the FGDC RSE to ISO 19115-2 transform. The Spatial Reference Information is not currently mapped over to ISO but will be mapped in future versions.
This record was automatically modified on 2015-10-14 to include references to NCEI where applicable.
NOAA National Centers for Environmental Information
Metadata Specialist
editor
NOAA National Centers for Environmental Information
Hazards Data Manager
haz.info@noaa.gov
pointOfContact