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51. Strong Motion Earthquake Data Values of Digitized Strong-Motion Accelerograms, 1933-1994 [gov.noaa.ngdc.mgg.hazards.G01145]
The Strong Motion Earthquake Data Values of Digitized Strong-Motion Accelerograms is a database of over 15,000 digitized and processed accelerograph records from 1933 to 1994. Data were obtained from ...


52. United States Earthquake Intensity Database, 1638-1985 [gov.noaa.ngdc.mgg.hazards.G01142]
The United States Earthquake Intensity Database is a collection of damage and felt reports for over 23,000 U.S. earthquakes from 1638-1985. The majority of intensities are for U.S. cities, but there ...


53. Water Column Sonar Data Collection [gov.noaa.ngdc.mgg.wcd.WCD_Collection]   CHILD DIFs
The collection and analysis of water column sonar data is a relatively new avenue of research into the marine environment. Primary uses include assessing biological abundance, species identification,and ...


54. Data on the Earth's Magnetic Field and its Secular Change since 1800 [gov.noaa.ngdc.mgg.geophysics.G01152]
Information on the past and present orientation of the Earth's magnetic field is available from the National Geophysical Data Center (NGDC) which serves as the national data bank for geomagnetic data. ...


55. Behavior of Columns During Earthquakes [gov.noaa.ngdc.mgg.photos.G01215]
The behavior of columns during earthquakes is very important since column failures may lead to additional structural failures and result in total building collapses. For example, in the Mexico City ...


56. Earthquake Damage - General [gov.noaa.ngdc.mgg.photos.G01194]
An earthquake is the motion or trembling of the ground produced by sudden displacement of rock in the Earth's crust. Earthquakes result from crustal strain, volcanism, landslides, and collapse of ...


57. Earthquake Damage to Schools [gov.noaa.ngdc.mgg.photos.G01198]
This set of slides graphically illustrates the potential danger that major earthquakes pose to school structures and to the children and adults who happen to be inside at the time of the earthquake. ...


58. Earthquake Damage to Transportation Systems [gov.noaa.ngdc.mgg.photos.G01197]
Earthquakes represent one of the most destructive natural hazards known to man. A serious result of large-magnitude earthquakes is the disruption of transportation systems, which limits post-disaster ...


59. Erosional Landforms [gov.noaa.ngdc.mgg.photos.G01217]
The hydrologic system, which includes all possible paths of motion of Earth's near-surface fluids including air and water, is largely responsible for the variety of landforms found on the continents. ...


60. Faults [gov.noaa.ngdc.mgg.photos.G01203]
Through the study of faults and their effects, much can be learned about the size and recurrence intervals of earthquakes. Faults also teach us about crustal movements that have produced mountains ...


61. Landslides, Set 1 [gov.noaa.ngdc.mgg.photos.G01199]
This set of slides graphically illustrates the potential danger that major earthquakes pose to school structures and to the children and adults who happen to be inside at the time of the earthquake. ...


62. Landslides, Set 2 [gov.noaa.ngdc.mgg.photos.G01372]
This set expands the topics included in Set 1 and includes (in addition to landslides) rockfalls, rock avalanches, mud flows, debris flows, slumps, creep, and sinkholes. The photos were taken in California, ...


63. Seismic Creep [gov.noaa.ngdc.mgg.photos.G01216]
Seismic creep is the constant or periodic movement on a fault as contrasted with the sudden erupture associated with an earthquake. It is a usually slow deformation of rock resulting from constant ...


64. Tsunamis - General [gov.noaa.ngdc.mgg.photos.G01218]
Tsunami is a Japanese word meaning harbor wave. It is a water wave or a series of waves generated by an impulsive vertical displacement of the surface of the ocean or other body of water. This slide ...


65. Volcanic Rocks and Features [gov.noaa.ngdc.mgg.photos.G01222]
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 ...


66. Volcanoes in Eruption - Set 1 [gov.noaa.ngdc.mgg.photos.G01221]
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 ...


67. Volcanoes in Eruption - Set 2 [gov.noaa.ngdc.mgg.photos.G01223]
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 ...


68. NOAA/WDS Global Historical Tsunami Database at NGDC, 2100 BC to present [gov.noaa.ngdc.mgg.hazards.G02151]
The Global Historical Tsunami Database provides information on over 2,400 tsunamis from 2100 BC to the present in the the Atlantic, Indian, and Pacific Oceans; and the Mediterranean and Caribbean ...


69. Global Significant Earthquake Database, 2150 BC to present [gov.noaa.ngdc.mgg.hazards.G012153]
The Significant Earthquake Database is a global listing of over 5,700 earthquakes from 2150 BC to the present. A significant earthquake is classified as one that meets at least one of the following ...


70. Global Significant Volcanic Eruptions Database, 4360 BC to present [gov.noaa.ngdc.mgg.hazards.G10147]
The Significant Volcanic Eruptions Database is a global listing of over 600 eruptions from 4360 BC to the present. A significant eruption is classified as one that meets at least one of the following ...


71. NOAA National Centers for Environmental Prediction (NCEP)'s Global Forecast System (GFS) Model [NOAA_NCEP_GFS_Model]
Two times daily global analysis fields from the NOAA National Centers for Environmental Prediction (NCEP)'s Global Forecast System (GFS) Model. Data are served by the Center for Ocean-Land-Atmosphere ...


72. DMSP SSM/I-SSMIS Pathfinder Daily EASE-Grid Brightness Temperatures [NSIDC-0032]
This Level-3 Equal-Area Scalable Earth-Grid (EASE-Grid) Brightness Temperature data set, collected since 09 July 1987, is a part of the NOAA/NASA Pathfinder Program. The data set consists of gridded ...


73. Nimbus-7 SMMR Pathfinder Daily EASE-Grid Brightness Temperatures [NSIDC-0071]
This data set consists of brightness temperatures acquired from the Scanning Multichannel Microwave Radiometer (SMMR) on board the Nimbus-7 Pathfinder satellite. The brightness temperatures have been ...


74. Northern Hemisphere EASE-Grid 2.0 Weekly Snow Cover and Sea Ice Extent [NSIDC-0046]
The Northern Hemisphere EASE-Grid 2.0 Weekly Snow Cover and Sea Ice Extent Version 4 product combine snow cover and sea ice extent at weekly intervals from 23 October 1978 through 31 December 2011, ...


75. Worldwide Interpretive Reports for Marine Seismic-Reflection and Other Geophysical Data [gov.noaa.ngdc.mgg.seismic.G00976]
This file contains US Geological Survey Open File Reports for Marine Seismic-Reflection data. The majority of these data are available on mylar/black line full-size sections. Lines may be obtained ...


76. Downhole Logging Data from the Deep Sea Drilling Project [gov.noaa.ngdc.mgg.well_log.G00913]
Digital downhole wire-line logging data from the Deep Sea Drilling Project (DSDP) previously available from NGDC on CD-ROM are now available from the Borehole Research Group of the Lamont-Doherty ...


77. Calculations of the Total Number of Electrons Along a Ray Path Extending from the Transmitter to the Receiver [gov.noaa.ngdc.stp.ionosphere.G00566]
Ionospheric Total Electron Content (TEC) is the total number of electrons in a column of unit cross section extending from the transmitter to the receiver. TEC is calculated from observations of the ...


78. Defense Meteorological Satellite Program (DMSP) - Space Weather Sensors [gov.noaa.ngdc.stp.ionosphere.G10022]
The Defense Meteorological Satellite Program (DMSP) maintains a constellation of sun-synchronous, near-polar orbiting satellites. The orbital period is 101 minutes and inclination is 99 degrees. The ...


79. Ionospheric Oblique Incidence Soundings by Satellites [gov.noaa.ngdc.stp.ionosphere.G00563]
The oblique incidence sweep-frequency ionospheric sounding technique uses the same principle of operation as the vertical incidence sounder. The primary difference is that the transmitter and receiver ...


80. Measurement of Incoherent Scatter [gov.noaa.ngdc.stp.ionosphere.G00145]
For radio waves transmitted through the ionosphere with frequencies much larger (50 to 1300MHz) than the plasma frequency (up to 15MHz), very small-scale fluctuations of electron density will scatter ...


81. AA Geomagnetic Activity Indices From Two Antipodal Observatories in Australia and England [gov.noaa.ngdc.stp.indices.G00588]
The National Geophysical Data Center receives, on a monthly basis, indices that are based on the data from two approximately antipodal observatories in England and Australia. The AA-indices are available ...


82. Air Force Geophysics Laboratory Magnetometer Network [gov.noaa.ngdc.stp.geomag.G09997]
This file is comprised of the variation one minute values of the geomagnetic components X, Y and Z. These data were calculated by the Air Force Geophysics Laboratory magnetometer network during the ...


83. Auroral Electrojet Index Designed to Provide a Global Measure, Hourly Intervals, of Auroral Zone Magnetic Activity [gov.noaa.ngdc.stp.indices.G00115]
The Auroral Electrojet (AE) index is designed to provide a global quantitative measure of auroral zone magnetic activity produced by enhanced ionospheric currents flowing below and within the auroral ...


84. Auroral Electrojet Index Designed to Provide a Global Measure, l-minute Intervals, of Auroral Zone Magnetic Activity [gov.noaa.ngdc.stp.indices.G00114]
The Auroral Electrojet index (AE) is designed to provide a global quantitative measure of auroral zone magnetic activity produced by enhanced ionospheric currents flowing below and within the auroral ...


85. Auroral Electrojet Indices Designed to Provide a Global Measure, 2.5-Minute Intervals, of Auroral Zone Magnetic Activity [gov.noaa.ngdc.stp.indices.G00113]
The Auroral Electrojet index (AE) is designed to provide a global quantitative measure of auroral zone magnetic activity produced by enhanced ionospheric currents flowing below and within the auroral ...


86. DMSP OLS - Operational Linescan System [gov.noaa.ngdc.stp.dmsp.G01119]
Visible and infrared imagery from DMSP Operational Linescan System (OLS) instruments are used to monitor the global distribution of clouds and cloud top temperatures twice each day. The archive data ...


87. DMSP SSM/I- Microwave Imager [gov.noaa.ngdc.stp.dmsp.G01123]
The SSM/I is a seven-channel, four frequency, linearly-polarized, passive microwave radiometric system which measures atmospheric, ocean and terrain microwave brightness temperatures at 19.35, 22.235, ...


88. DMSP SSMT/2 - Atmospheric Water Vapor Profiler [gov.noaa.ngdc.stp.dmsp.G10018]
The SSM/T-2 sensor is a five channel, total power microwave radiometer with three channels situated symmetrically about the 183.31 GHz water vapor resonance line and two window channels. This instrument ...


89. DST Indices - Reflection Variations in the Magnetospheric Tail Current and Field-aligned Currents in the Magnetosphere [gov.noaa.ngdc.stp.indices.G00587]
The file is comprised of monthly DST indices. These indices are derived from a network of eight stations in the equatorial latitudes. Hourly DST indices provide an index of geomagnetic activity as ...


90. Defense Meteorological Satellite Program (DMSP) [gov.noaa.ngdc.stp.dmsp.G10021]
The Defense Meteorological Satellite Program (DMSP) satellites collect visible and infrared cloud imagery as well as monitoring the atmospheric, oceanographic, hydrologic, cryospheric and near-Earth ...


91. Electron Density Profile Data Contains Virtual Height/Frequency Pairs from a Profile or Profiles (Composite Months) of Ionograms [gov.noaa.ngdc.stp.ionosonde.G00146]
The Electron Density Profile, N(h), data set contains both individual profiles and composite months. The data consist of virtual height/frequency pairs from a profile or profiles (composite months) ...


92. Geomagnetic Absolute Mean Values at Hourly Intervals from 220 Observatories Worldwide [gov.noaa.ngdc.stp.geomag.G00002]
This file is comprised of absolute mean hourly values of the geomagnetic components D, H and Z or X, Y and Z. These values, on magnetic tape, are available from approximately 220 of the 400 worldwide ...


93. Geomagnetic Components D, H, X, Y, Z, and R 10-second Instantaneous Measurements [gov.noaa.ngdc.stp.geomag.G00122]
These data are generated as part of the International Magnetospheric Study. The file consists of 10-second instantaneous measurements for the geomagnetic components D, H, X, Y, Z and R. The 10 second ...


94. Geomagnetic Indices Bulletin (GIB) [gov.noaa.ngdc.stp.geomag.G01344]
The Geomagnetic Indices Bulletin is a one page sheet containing the magnetic indices Kp, Ap, Cp, An, As, Am and the provisional aa indices. The bulletin is published monthly.


95. Geomagnetic Kn, Ks, Km Indices [gov.noaa.ngdc.stp.indices.G01185]
A full description of the indices Kn, Ks, Km is given in a monography,"Indices Kn, Ks et Km, 1964-1967", edited in 1968 by the Centre National de la Recherche Scientifique, 15 quai Anatole, France, ...


96. Geomagnetic Principal Magnetic Storms [gov.noaa.ngdc.stp.geomag.G01183]
The abbreviations used for observatory names are as follows: GEOMAGNETIC OBSERVATORIES Code Station Geomagnetic Latitude ABG Alibag AMS Martin de Vivie. These data present the principal magnetic storms ...


97. Geomagnetic Variation Data - 1-Minute Remote Geophysical Observatory Network (RGON) [gov.noaa.ngdc.stp.geomag.G00124]
This data file was generated as part of the International Magnetospheric Study (IMS). The file consists of values of the geomagnetic components D, H, X, Y, Z, and R averaged from 10-second instantaneous ...


98. Geomagnetic aa Indices [gov.noaa.ngdc.stp.indices.G00020]
The geomagnetic aa indices are the continuation of the series beginning in the year 1868. A full description of these indices is given in the International Association of Geomagnetism and Aeronomy ...


99. Instantaneous Absolute Values of the Geomagnetic Components D, H, and Z or X,Y, and Z at 1-minute Intervals for 50 Observatories Database [gov.noaa.ngdc.stp.geomag.G00021]
The file is comprised of instantaneous absolute values of the geomagnetic components D, H, and Z or X, Y, and Z at 1-minute intervals. These values were derived either from analog recordings (magnetograms) ...


100. Ionospheric Digital Database [gov.noaa.ngdc.stp.ionosonde.G01257]
The ionosphere is that part of the Earth's atmosphere that results mainly from the photo ionization of the upper atmosphere. Traditionally, the following ionospheric regions and their approximate ...


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