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Metadata Identifier: gov.noaa.ngdc.mgg.photos:G01209

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 Cape Mendocino, CA Earthquakes, April 25 & 26, 1992 On April 25, 1992, a magnitude 7.1 earthquake occurred in the Cape Mendocino area. Two additional earthquakes, magnitudes 6.6 and 6.7 occurred the next morning. The first earthquake was located six miles north of Petrolia, California, in a sparsely populated part of southwestern Humboldt County. Five small communities were located within a 50 mile radius of these events: Honeydew, Petrolia, Rio Dell, Scotia, and Ferndale. This slide set illustrates the effects and damage of a moderately large earthquake and moderate aftershocks on this sparsely settled area.Statistics - The first earthquake was located six miles The main earthquake came immediately after a Saturday morning parade at Ferndale. Horses reportedly became spooked during the parade (before the earthquake), but riders attributed it to flags fluttering in the wind along the parade route.Seismicity and Geology - The Cape Mendocino region of California's north coast is one of the most seismically active regions in the conterminous United States. This seismic zone coincides with the Mendocino Triple Junction, a tectonically unstable area where three tectonic plates join together.The earthquake of April 25 is exceptional for several reasons. It generated a tsunami that was recorded along the West Coast and measurable in the Hawaiian Islands. It also produced distinct uplift (maximum uplift = 1 m) along a 25-km-long section of the coastline. The April 25 event was the largest historic earthquake in this region with an epicenter clearly located on land, and the only damaging event that may have resulted from thrust faulting along the Cascadia subduction zone.Earth Effects - A broad zone of ground fractures, coastal uplift, and elevation changes are the only surface changes to indicate the location and tilt of the fault plane. Strong ground shaking during the earthquakes triggered numerous landslides in steep mountainous areas. A landslide at Scotia Bluffs (south of Scotia) temporarily interrupted traffic on the North Coast Railroad. Tension cracks, due to soil compaction and downhill slumping, restricted traffic on the Mattole Road between Honeydew, Petrolia, and Ferndale. Liquefaction took place in modern deposits of the Mattole River between Petrolia and Honeydew, and in the flood-plain deposits of the Eel and Salt Rivers. Soils liquefy when ground water near the surface is forced between the grains of sand during an earthquake. The sandy soil behaves like a very thick liquid. Structures then settle or tip in the liquefied soil, or are ripped apart as the ground spreads laterally or flows. Sand blows result from the eruption of liquefied sediment from the subsurface on to the ground. The eruption of liquefied sediment is facilitated by fissures in the ground, which are also produced by strong shaking during an earthquake.Damage - Collectively, these shocks caused significant damage to older structures in the sparsely populated, mountainous, epicentral region. The earthquake caused 98 injuries and moderate damage in Humboldt County. Losses topped $66 million. Single- and double-story, wood-frame houses and commercial buildings were the most common type of structures in the epicentral region, where lumber is the principal industry. Many foundations were the pier and post type, providing little resistance to lateral ground shaking. The earthquakes jarred many older homes off their foundations.
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SV_Identification

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CI_Citation

Count Component Title Date Citation Identifier
1 Cape Mendocino, CA Earthquakes, April 25 & 26, 1992
  • 1994
Document
1 Getty Thesaurus of Geographic Names
    1 INFOTERRA Keyword Thesaurus
      1 NASA/GCMD Data Center Keywords
        1 NASA/GCMD Earth Science Keywords
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          CI_Series

          none found
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          CI_ResponsibleParty

          Count Component Individual Organization Position Email Role Linkage
          1 DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce (comp) originator
          1 Heather McCullough DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Heather.McCullough@noaa.gov http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode
          1 Heather McCullough DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Heather.McCullough@noaa.gov pointOfContact
          1 Heather McCullough DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Heather.McCullough@noaa.gov processor
          1 Heather McCullough DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Heather.McCullough@noaa.gov custodian
          1 National Geophysical Data Center publisher
          1 User Services DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce ngdc.info@noaa.gov distributor
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          CI_OnlineResource

          Count Component Linkage Name Description Function
          1 http://www.ngdc.noaa.gov/hazard/
          1 http://www.ngdc.noaa.gov/hazardimages/
          2 http://www.ngdc.noaa.gov/nndc/struts/results?eq_1=16&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 -124.16 -124.02 40.35 40.2
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          EX_GeographicBoundingBox

          Count Component West East North South
          1 -124.16 -124.02 40.35 40.2
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          EX_TemporalExtent

          Count Component Start End
          1
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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 slide set is out of stock and will not be produced again. Distribution has been modified and the SOP for the 35mm slide has been removed.
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          MI_Operation

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          MI_Platform

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          MI_Instrument

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