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INTRO
Introducing the GEON IDV
INSTALL Download & Run the GEON IDV LEARN Tutorial ... How to Use the GEON IDV ... More How-to YOUR DATA Data Formats for the IDV |
DATA -- Earth Science Data Available Online for the GEON IDV
Data that are publically available, in formats the IDV can use, and some IDV bundle files to make displays of the data.
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Earth surface deformation: GPS Data
Earthquakes: Locations, Depths, and Magnitudes
Earthquakes: Focal Mechanisms
Seismic Tomography
Seismic Raypaths
Seismic Anisotropy
Global Geodynamics: Mantle Convection
Earth surface deformation: Tectonic plates
Earth surface deformation: Earth strain observations, INSAR, Lidar, etc.
Volcanoes
Topography: surface elevation data
Geology maps and vertical cross sections
Surface Gravity obs and anomalies
Surface Magnetic obs and anomalies
Crustal structure observations and models, and Mohorovicic Discontinuity
Moon, Mars, Venus
GIS shape files
Earth surface deformation: GPS Data
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See GEON IDV Plots of GPS Data
Earthquakes Locations, Depths, and Magnitudes
These sources are catalogs of earthquake locations and magnitudes for any place in the world, ready to use in the IDV. You can load these data sources directly into the IDV (Dashboard window -> Data Choosers panel).
A great source of up-to-date earthquake location and magnitude data for the GEON IDV is the IRIS Earthquake Browser. The IRIS Earthquake catalog has more than 1,900,000 world-wide earthquake locations with depths and magnitudes!
The Earthquake Browser uses a GoogleMap interface to the IRIS hypocenter catalog. You select an area of interest on the map, how many hypocenters you want, and the time and magnitude ranges. The Earthquake Browser finds the data that matches your search. A URL link to a NetCDF file is provided; load the URL into the IDV URLs entry box, or "save the link target" to that NetCDF file. That file will work in the GEON IDV. You need to choose Data Type "netCDF Point Data files."
IRIS Earthquake Browser data files with hypocenters and magnitudes as GEON IDV 'point data files' (NetCDF format). Copy the link URL for a data source and paste it into the IDV's Data Chooser URLs entry box. Be sure to use Data Source Type of "NetCDF Point Data" in the Dashboard's Data Chooser.
California region, the 200 largest earthquakes, 1964 to 2008
"Ring of Fire," 2500 earthquakes, 0 to 33 km deep
"Ring of Fire," 5000 earthquakes, 100 to 900 km deep
"Ring of Fire," 3000 earthquakes, 34.0 to 99.9 km deep
"Ring of Fire," 5000 earthquakes, 50 to 900 km deepSample IDV Display - Tonga region earthquakes, high angle, oblique from southwest (volcanoes shown as white triangles)
This Week's Earthquakes
You can plot this week's earthquakes, including earthquakes in the last day, without loading any data source, using the IDV's main menu command "Displays -> Locations -> Earth -> Earthquakes." The IDV display controls let you change point symbols, colors, and plot density (cluttering) as usual.The earthquake data is from the USGS, supplied by an RSS feed from the USGS.
The IDV label lists magnitude; in the IDV display control's "Locations" tab you can see depths listed, and in the "Selected" tab panel you can see more data about an earthquake including a web link to the USGS Earthquake Center data page for that event.
Engdahl and Villaseñor, Global Seismicity 190 - 1999 "Centennial Catalog"
A global catalog of 11912 earthquakes with locations and magnitudes, since 1900, "created with the purpose of giving a realistic picture of the seismicity distribution in the Earth. ... For recent years (1964 to the present) a cut-off magnitude of 5.5 has been chosen for the catalog, and the catalog is complete down to that threshold. For the period prior to 1964 (also referred to as "historical instrumental" or simply "historical" period) the cut-off considered is magnitude 6.5. Between the 1930's and 1963 the catalog is complete to te magnitude 6.5 threshold, but prior to that, the catalog is only complete down to magnitude 7.0."
A data file of the catalog for the IDV is online at http://geon.unavco.org/unavco/earthquakes/CentMagCatalog.nc (time in years only). Be sure to use Data Source Type of "NetCDF Point Data" in the Dashboard's Data Chooser.
data publication: Engdahl, E.R., and A. Villaseñor,"Global Seismicity 1900 - 1999," in W.H.K. Lee, H. Kanamori, P.C.Jennings, and C. Kisslinger (editors), International Handbook of Earthquake and Engineering Seismology, vol. 81 A, Chapter 41, pp. 665 - 690, Academic Press, 2002. See also Centennial Earthquake Catalog.
Sample IDV displays:
'Ring of Fire' Earthquakes and Volcanoes, display 1 (bundle file for that display)
'Ring of Fire' Earthquakes and Volcanoes, display 2 (bundle file for that display)The USGS NEIC Worldwide Earthquake search (from the National Earthquake Information Center, PDE data):
Sample GEON IDV 'point data csv files':
http://geon.unavco.org/unavco/earthquakes/NEIC_1980-1989_mag6+_global_list.csv world-wide earthquakes, 1980-1989, mag 6.0 +
http://geon.unavco.org/unavco/earthquakes/NEIC_1990-1999_mag6+_global_list.csv world-wide earthquakes, 1990-1999, mag 6.0 +
http://geon.unavco.org/unavco/earthquakes/NEIC_2000-2006_mag6+_global_list.csv world-wide earthquakes, 2000-2006, mag 6.0 +
http://geon.unavco.org/unavco/earthquakes/NEIC_NorAm_1973-2006_Mag5+_for_IDV.csv North American earthquakes, 1973-2006, mag 5.0 +
Use these .csv files as a template for your own hypocenter and magnitude data file for the IDV. Retain the top two header lines unaltered, and do not change column order.
Sample GEON IDV display: North America 1973-2006 mags 5 +
Seismic Tomography
To learn about exploring and comparing tomography, the GEON IDV, and the NetCDF data format, see
Using the GEON IDV to explore seismic tomography
Seismic Raypaths
URLs of synthetic data files for GEON IDV use: (the _p3. in the filename is required for ray path data)http://geon.unavco.org/unavco/NETCDF/short_raypath_Illinoisp3.nc
http://geon.unavco.org/unavco/raypath/raypath_P_wave_105deg_p3.nc
http://geon.unavco.org/unavco/raypath/raypath_P_wave_30deg_p3.nc
http://geon.unavco.org/unavco/raypath/raypath_P_wave_60deg_p3.nc
http://geon.unavco.org/unavco/raypath/raypath_P_wave_78deg_p3.nc
Seismic Anisotropy
URLs of data files for GEON IDV use, from Greg Waite:http://geon.unavco.org/unavco/anisotropy/Waite_WesternUS_anisotropy.nc
http://geon.unavco.org/unavco/anisotropy/Waite_et_al_anisotropic_Yellowstone_Table3.nc Be sure to use Data Source Type of "NetCDF Point Data" in the Dashboard's Data Chooser.
Data publication: Gregory P. Waite, Derek L. Schutt, Robert B. Smith, and Eugene D. Humphreys, "Models of lithospheric and asthenosphere anisotropic structu re of the Yellowstone hotspot from shear wave splitting", J. Geophys. Res., 110, 2005, B11304, doi:10.1029/2004JB003501; Table 3.
Global Geodynamics: Mantle Convection
To learn about exploring and comparing tomography or mantle convection, the GEON IDV, and the NetCDF data format, see
Using the GEON IDV to explore seismic tomography and mantle convection models
Using the NetCDF data format for seismic tomography and mantle convection models
Earth surface deformation: tectonic plates
Use this bundle file http://geon.unavco.org/unavco/demos/paleoplates_globe_280ma-present.xidv to create a globe display of tectonic plates motion for the past 600 M years. Simply add the url of a bundle file to the IDV "Dashboard" window, Data Choosers panel, URLs entry box, click "Add source," and the display should be made.
The paleoplate images are made and provided online by Professor Ron Blakey Department of Geology, Northern Arizona University, Flagstaff, Arizona. The particular images used are paleogeographic map images in rectangular format. Note that the IDV maps the rectangular images to the 3D globe.
The IDV could use more detailed paleoplate images, and shape files of past and prresent plate and continent boundaries. Let us know if you know of any we can use.
Earth surface deformation: Earth strain observations, INSAR, Lidar, etc.
Data for GSRM Strain (second invariant strain rate) by Kreemer, C, A.J. Haines, W.E. Holt, G. Blewitt, and D. Lavalé, and plate motions vectors relative to Europe can be seen with the bundle file http://geon.unavco.org/unavco/XIDV/GSRM_GEON_IDV_demo.xidv. Simply add the url of a bundle file to the IDV "Dashboard" window, Data Choosers panel, URLs entry box, click "Add source," and the display should be made.
The Global Strain Rate Map (GSRM) data is provided by Corne Kreemer. See Kreemer, C, A.J. Haines, W.E. Holt, G. Blewitt, and D. Lavalée, On the determination of a global strin rate model, Earth Planets Space, 52, 765-770, 2000; and Kreemer, C., W.E. Holt, and A.J. Haines, "An integrated global model of present-day plate motions and plate boundary deformation," Geophysical Journal International, 154, 8-34, 2003. See also http://gsrm.unavco.org/, http://geodesy.unr.edu/cornekreemer/gsrm.htm, and http://geodesy.unr.edu/publications/Kreemer_et_al_GSRM_2003.pdf
In 2008 UNAVCO may add InSAR interferometry displays to the GEON IDV, and LIDAR data plots. InSAR interferograms can be shown now if they are geolocated TIFF images.
Volcanoes
You can plot the names and locations of volcanoes, without loading any data sources, using the IDV's main menu command
"Displays -> Locations -> Earth -> Volcanoes." The associated display controls let you change point symbols, colors, and plot density (cluttering) as usual.
Volcano locations and names, in South America, plus earthquake locations and the JPL BLueMarble surface image for August
Click to see full size displayThe volcano data is from the Smithsonian Global Volcanism Progam (http://www.volcano.si.edu). This is a very complete collection of most of the volcanic surface features on the Earth.
In the display control's "Locations" tab you can see a list of all the catalog's volcanoes by name. Click on a nema nd two things happen: the IDV display moves to show that volcano in the center of the image, and you see a panel of information about the volcano, including a photograph. The example is for "Robinsom Crusoe" volcano in the Chilean Islands.
GIS Shape Files
You can plot GIS "shape files" (.shp), with data for lines, in the IDV. The IDV does not yet handle the associated files such as .dbf files for labels or color fill.Sample NetCDF data files:
major US rivers (http://geon.unavco.org/unavco/gis/rs14fe02.shp) (15 megabytes)
all US rivers and larger streams (http://geon.unavco.org/unavco/gis/rv14fe02.shp) (83 megabytes)
lakes (http://geon.unavco.org/unavco/gis/lk17de98.shp) (11 megabytes)Data is from the National Weather Service GIS Shapefile Database
Topography: surface elevation data
The IDV can display elevation values or topography data as contours, surfaces shaded or colored by elevation value, and as 3D topographic relief maps (may be colored by elevation or shaded; the vertical exaggeration is adjustable). Surfaces may be below sea level, and displays may be in many projections and areas including the Arctic and Antarctic. Other 2d grid parameters may be displayed on a map with the parameter value controlling the "Altitude" in a 3D releif plot, too..Sample IDV 3D relief displays:
Japanese bathymetryi (10 x vertical exaggeration; NGDC GLOBE data)
Mt St Helens (true vertical scale; USGS hoquiam-e DEM, drapped with arial photograph)The IDV can read and display DEM files. Many of these are available online; see for example The National Map Seamless Server and . For Alaska see Alaska DEMS.
The USGS makes DEMs on many scales; see USGS Digital Elevation Models (DEM) and USGS DEMs. See also USGS Geographic Data Download including 1,125000 scale (3 arc seconds) and higher resolution 1:24000 scale DEMs (resolution near 10 meters), and other topographic data. There are also 2 arc seconds DEMs; see 2-Arc-Second Digital Elevation Models
To find a USGS 1:250,000 DEM (100 m grid spacing; 1 square geographic degree area) for your area, first find the name of the USGS 1:250,000 topo map for the area, for example, using the web service USGS topo maps. Then find the USGS DEM file of the same name in this directory. These DEMs cover an area 1 degree on a side. For each topo map area and name, there are an east and west DEM. Download the file (about 1 MB); gunzip the file (to 9.83 MB). Add the "data source" file to the IDV -- use data type "DEM file." You can use it for any topo data display or purpose.
A sample DEM file from the USGS is http://geon.unavco.org/unavco//TOPO/hoquiam-e.dem for part of Washington state that includes Mt. St. Helens.
Scales and resolutions:
USGS 1:24000 scale DEMs (resolution near 10 meters)
USGS 2 arc-second DEMs (about 62 meters resolution horizontally; the unit of coverage is a 30- by 30-minute block, or 1 km on a side);
USGS 1:250,000-scale Digital Elevation Models have a horizontal resolution of 3 arc-seconds: the spacing of the elevation values is 3 arc-seconds (roughly 100 meters). The vertical resolution is the nearest integral meter at each grid location.
30 arc second or about 1 km grid point spacing (resolution).
2 arc minute or about 3 km grid point spacing.
4 arc minute or about 7 km.
5 arc minute or about 10 km.These web pages have topography files (NetCDF format files) for the IDV, of the indicated resolution:
7 km (4 minute) to (with bathymetry)
3 km (2 minute) (with bathymetry)
1 km (30 sec) (no bathymetry)
various (9.6 MB)
UGGS DEMs (most are 1:125000)Global coverage from the USGS
GTOPO30 "GTOPO30 is a global digital elevation model (DEM) resulting from a collaborative effort led by the staff at the U.S. Geological Survey's EROS Data Center in Sioux Falls, South Dakota. Elevations in GTOPO30 are regularly spaced at 30-arc seconds (approximately 1 kilometer). GTOPO30 was developed to meet the needs of the geospatial data user community for regional and continental scale topographic data. " - from the USGS. Note that GTOPO30 does not include bathymetry below the ocean surface.
You can download tar files of 50 latitude by 40 degree longitude DEM files from ftp://edcftp.cr.usgs.gov/pub/data/gtopo30/global .
At the moment these GTOPO30 DEM files do not work in the IDV.Sample IDV display of an oblique 3D relief view Japan and seafloor bathymetry (2 minute resolution; 10 times vertical exaggeration)
See also Using Topography and 3D Relief in the IDV
You can drape TIFF and JPEG (http://geon.unavco.org/unavco/IDV_for_GEON_howto.html#jpgmap) imagery over 3D relief topography
