Data Services Products: EMC-ExtractingData Extracting Data from the netCDF Earth Model Files

Summary

There is a “large collection of codes and tools available for manipulating the netCDF Files. This page provides examples of how two of these tools (ncdump and ncks) could be used to extract information from the netCDF model files.

Description

The EMC contributed Earth models are available for download from the model overview pages or IRIS’ Searchable Product Depository (SPUD ) in the netCDF (network Common Data Form) format. The netCDF dataset is stored as a two-part single binary file comprising of a header and data sections:

  • header, contains information on dimensions, attributes and variables
  • data, is a collection of fixed-size data, that contains the data for variables

In a netCDF model file, variables (e.g., the S-wave velocity perturbation, dvs, and P-wave velocity perturbation, dvp) store the actual data, the dimensions (e.g., latitude, longitude, depth) give the relevant dimension information for the variables, and the attributes provide auxiliary information about the variables or the dataset itself (…more ).

There is a large collection of codes and tools available for manipulating the netCDF Files. Below are examples of how two of these tools (ncdump and ncks ) could be used to extract information from a netCDF model file.

NOTE: these examples do not represent the full capabilities of these tools

The ncdump utility

The ncdump utility allows the user to convert the netCDF binary to ASCII. Below are a few examples of application of this tool to extract information from the DNA09 model data file, DNA09_percent.nc (…more ).

  • Extract the header information or metadata
  • Show only the header information in the output
  • Show the values of coordinate variables (variables that are also dimensions) as well as the declarations of all dimensions, variables, and attribute values

Extract the header information or metadata:

ncdump DNA09_percent.nc

 netcdf DNA09_percent {
dimensions:
        depth = 41 ;
        longitude = 106 ;
        latitude = 86 ;
variables:
        float latitude(latitude) ;
                latitude:long_name = "Latitude; positive north" ;
                latitude:units = "degrees_north" ;
                latitude:standard_name = "latitude" ;
        float longitude(longitude) ;
                longitude:long_name = "Longitude; positive east" ;
                longitude:units = "degrees_east" ;
                longitude:standard_name = "longitude" ;
        float depth(depth) ;
                depth:long_name = "depth below earth surface" ;
                depth:units = "km" ;
                depth:positive = "down" ;
        float dvs(depth, latitude, longitude) ;
                dvs:long_name = "Shear Velocity Perturbation" ;
                dvs:display_name = "Shear Velocity  Perturbation (%)" ;
                dvs:missing_value = 99999.f ;
                dvs:_FillValue = 99999.f ;
        float dvp(depth, latitude, longitude) ;
                dvp:long_name = "P-wave Velocity Perturbation" ;
                dvp:display_name = "P-wave Velocity  Perturbation (%)" ;
                dvp:missing_value = 99999.f ;
                dvp:_FillValue = 99999.f ;

// global attributes:
                :title = "Finite-frequency P- and S-velocity models for the western US" ;
                :id = "DNA09_percent" ;
                :summary = "DNA09 is a 3-D model of shear wave (S) and compressional wave ...
                        "" ;
                :keywords = "seismic, tomography, shear wave, s wave, elsatic waveform, p wave, compressional wave " ;
                :Conventions = "CF-1.0" ;
                .
                .
                .
                :geospatial_vertical_max = "1000" ;
                :geospatial_vertical_units = "km" ;
                :geospatial_vertical_positive = "down" ;
data:

 latitude = 32, 32.2, 32.4, 32.6, 32.8, 33, 33.2, 33.4, 33.6, 33.8, 34, 34.2,
    34.4, 34.6, 34.8, 35, 35.2, 35.4, 35.6, 35.8, 36, 36.2, 36.4, 36.6, 36.8,
    37, 37.2, 37.4, 37.6, 37.8, 38, 38.2, 38.4, 38.6, 38.8, 39, 39.2, 39.4,
    39.6, 39.8, 40, 40.2, 40.4, 40.6, 40.8, 41, 41.2, 41.4, 41.6, 41.8, 42,
    42.2, 42.4, 42.6, 42.8, 43, 43.2, 43.4, 43.6, 43.8, 44, 44.2, 44.4, 44.6,
    44.8, 45, 45.2, 45.4, 45.6, 45.8, 46, 46.2, 46.4, 46.6, 46.8, 47, 47.2,
    47.4, 47.6, 47.8, 48, 48.2, 48.4, 48.6, 48.8, 49 ;

 longitude = -125, -124.8, -124.6, -124.4, -124.2, -124, -123.8, -123.6,
    -123.4, -123.2, -123, -122.8, -122.6, -122.4, -122.2, -122, -121.8,
    -121.6, -121.4, -121.2, -121, -120.8, -120.6, -120.4, -120.2, -120,
    -119.8, -119.6, -119.4, -119.2, -119, -118.8, -118.6, -118.4, -118.2,
    -118, -117.8, -117.6, -117.4, -117.2, -117, -116.8, -116.6, -116.4,
    -116.2, -116, -115.8, -115.6, -115.4, -115.2, -115, -114.8, -114.6,
    -114.4, -114.2, -114, -113.8, -113.6, -113.4, -113.2, -113, -112.8,
    -112.6, -112.4, -112.2, -112, -111.8, -111.6, -111.4, -111.2, -111,
    -110.8, -110.6, -110.4, -110.2, -110, -109.8, -109.6, -109.4, -109.2,
    -109, -108.8, -108.6, -108.4, -108.2, -108, -107.8, -107.6, -107.4,
    -107.2, -107, -106.8, -106.6, -106.4, -106.2, -106, -105.8, -105.6,
    -105.4, -105.2, -105, -104.8, -104.6, -104.4, -104.2, -104 ;

 depth = 0, 25, 50, 75, 100, 125, 150, 175, 200, 225, 250, 275, 300, 325,
    350, 375, 400, 425, 450, 475, 500, 525, 550, 575, 600, 625, 650, 675,
    700, 725, 750, 775, 800, 825, 850, 875, 900, 925, 950, 975, 1000 ;

 dvs =
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.001, 0.001, -0.001, -0.003, -0.004,
    -0.003, -0.001, 0, 0.001, 0.002, 0.004, 0.006, 0.011, 0.022, 0.033,
    0.025, 0.007, -0.009, -0.033, -0.057, -0.057, -0.009, 0.035, 0.034,
    0.011, -0.011, 0.007, 0.024, -0.054, -0.302, -0.536, -0.495, -0.342,
    -0.19, 0.001, 0.181, 0.242, 0.136, 0.034, 0.03, 0.058, 0.08, 0.042,
    0.005, -0.006, 0.012, 0.029, -0.127, -0.326, -0.484, -0.394, -0.305,
    -0.128, 0.136, 0.4, 0.018, -0.477, -0.847, -0.731, -0.62, -0.554, -0.521,
    -0.487, -0.243, 0.018, 0.239, 0.349, 0.444, 0.481, 0.491, 0.508, 0.188,
    -0.127, -0.268, -0.047, 0.179, 0.366, 0.528, 0.688, 0.53, 0.361, 0.238,
    0.219, 0.203, -0.007, -0.321, -0.639, -0.406, -0.161, -0.095, -0.304,
    -0.485, -0.513, -0.48, -0.426,
   .
   .
   .
}

Show only the header information in the output:

ncdump -h DNA09_percent.nc

netcdf DNA09_percent {
dimensions:
	depth = 41 ;
	longitude = 106 ;
	latitude = 86 ;
variables:
	float latitude(latitude) ;
		latitude:long_name = "Latitude; positive north" ;
		latitude:units = "degrees_north" ;
		latitude:standard_name = "latitude" ;
	float longitude(longitude) ;
		longitude:long_name = "Longitude; positive east" ;
		longitude:units = "degrees_east" ;
		longitude:standard_name = "longitude" ;
	float depth(depth) ;
		depth:long_name = "depth below earth surface" ;
		depth:units = "km" ;
		depth:positive = "down" ;
	float dvs(depth, latitude, longitude) ;
		dvs:long_name = "Shear Velocity Perturbation" ;
		dvs:display_name = "Shear Velocity  Perturbation (%)" ;
		dvs:missing_value = 99999.f ;
		dvs:_FillValue = 99999.f ;
	float dvp(depth, latitude, longitude) ;
		dvp:long_name = "P-wave Velocity Perturbation" ;
		dvp:display_name = "P-wave Velocity  Perturbation (%)" ;
		dvp:missing_value = 99999.f ;
		dvp:_FillValue = 99999.f ;

// global attributes:
		:title = "Finite-frequency P- and S-velocity models for the western US" ;
		:id = "DNA09_percent" ;
		:summary = "DNA09 is a 3-D model of shear wave (S) and compressional wave (P) velocity perturbations for the western US.\n",
			"" ;
		:keywords = "seismic, tomography, shear wave, s wave, elsatic waveform, p wave, compressional wave " ;
		:Conventions = "CF-1.0" ;
		:Metadata_Conventions = "Unidata Dataset Discovery v1.0" ;
		:creator_name = "IRIS EMC" ;
		:creator_url = "http://ds.iris.edu/dms/products/emc/" ;
		:creator_email = "product@iris.edu" ;
		:institution = "IRIS DMC" ;
		:acknowledgment = "Model was provided by Richard M. Allen, \n",
			"Seismological LaboratoryDept. Earth & Planetary ScienceUC Berkeley" ;
		:references = "http://ds.iris.edu/dms/products/emc/references/index.htm?ref=OBREBSKIETAL10" ;
		:history = "2011-09-27" ;
		:comment = "model converted to netCDF by IRIS EMC" ;
		:geospatial_lat_min = "32.00" ;
		:geospatial_lat_max = "49.00" ;
		:geospatial_lat_units = "degrees_north" ;
		:geospatial_lat_resolution = "0.2" ;
		:geospatial_lon_min = "-125.00" ;
		:geospatial_lon_max = "-104.0" ;
		:geospatial_lon_units = "degrees_east" ;
		:geospatial_lon_resolution = "0.2" ;
		:geospatial_vertical_min = "0" ;
		:geospatial_vertical_max = "1000" ;
		:geospatial_vertical_units = "km" ;
		:geospatial_vertical_positive = "down" ;
}

Show the values of coordinate variables (variables that are also dimensions) as well as the declarations of all dimensions, variables, and attribute values:

ncdump -c DNA09_percent.nc

netcdf DNA09_percent {
dimensions:
	depth = 41 ;
	longitude = 106 ;
	latitude = 86 ;
variables:
	float latitude(latitude) ;
		latitude:long_name = "Latitude; positive north" ;
		latitude:units = "degrees_north" ;
		latitude:standard_name = "latitude" ;
	float longitude(longitude) ;
		longitude:long_name = "Longitude; positive east" ;
		longitude:units = "degrees_east" ;
		longitude:standard_name = "longitude" ;
	float depth(depth) ;
		depth:long_name = "depth below earth surface" ;
		depth:units = "km" ;
		depth:positive = "down" ;
	float dvs(depth, latitude, longitude) ;
		dvs:long_name = "Shear Velocity Perturbation" ;
		dvs:display_name = "Shear Velocity  Perturbation (%)" ;
		dvs:missing_value = 99999.f ;
		dvs:_FillValue = 99999.f ;
	float dvp(depth, latitude, longitude) ;
		dvp:long_name = "P-wave Velocity Perturbation" ;
		dvp:display_name = "P-wave Velocity  Perturbation (%)" ;
		dvp:missing_value = 99999.f ;
		dvp:_FillValue = 99999.f ;

// global attributes:
		:title = "Finite-frequency P- and S-velocity models for the western US" ;
		:id = "DNA09_percent" ;
		:summary = "DNA09 is a 3-D model of shear wave (S) and compressional wave (P) velocity perturbations for the western US.\n",
			"" ;
		:keywords = "seismic, tomography, shear wave, s wave, elsatic waveform, p wave, compressional wave " ;
		:Conventions = "CF-1.0" ;
		:Metadata_Conventions = "Unidata Dataset Discovery v1.0" ;
		:creator_name = "IRIS EMC" ;
		:creator_url = "http://ds.iris.edu/dms/products/emc/" ;
		:creator_email = "product@iris.edu" ;
		:institution = "IRIS DMC" ;
		:acknowledgment = "Model was provided by Richard M. Allen, \n",
			"Seismological LaboratoryDept. Earth & Planetary ScienceUC Berkeley" ;
		:references = "http://ds.iris.edu/dms/products/emc/references/index.htm?ref=OBREBSKIETAL10" ;
		:history = "2011-09-27" ;
		:comment = "model converted to netCDF by IRIS EMC" ;
		:geospatial_lat_min = "32.00" ;
		:geospatial_lat_max = "49.00" ;
		:geospatial_lat_units = "degrees_north" ;
		:geospatial_lat_resolution = "0.2" ;
		:geospatial_lon_min = "-125.00" ;
		:geospatial_lon_max = "-104.0" ;
		:geospatial_lon_units = "degrees_east" ;
		:geospatial_lon_resolution = "0.2" ;
		:geospatial_vertical_min = "0" ;
		:geospatial_vertical_max = "1000" ;
		:geospatial_vertical_units = "km" ;
		:geospatial_vertical_positive = "down" ;
data:

 latitude = 32, 32.2, 32.4, 32.6, 32.8, 33, 33.2, 33.4, 33.6, 33.8, 34, 34.2, 
    34.4, 34.6, 34.8, 35, 35.2, 35.4, 35.6, 35.8, 36, 36.2, 36.4, 36.6, 36.8, 
    37, 37.2, 37.4, 37.6, 37.8, 38, 38.2, 38.4, 38.6, 38.8, 39, 39.2, 39.4, 
    39.6, 39.8, 40, 40.2, 40.4, 40.6, 40.8, 41, 41.2, 41.4, 41.6, 41.8, 42, 
    42.2, 42.4, 42.6, 42.8, 43, 43.2, 43.4, 43.6, 43.8, 44, 44.2, 44.4, 44.6, 
    44.8, 45, 45.2, 45.4, 45.6, 45.8, 46, 46.2, 46.4, 46.6, 46.8, 47, 47.2, 
    47.4, 47.6, 47.8, 48, 48.2, 48.4, 48.6, 48.8, 49 ;

 longitude = -125, -124.8, -124.6, -124.4, -124.2, -124, -123.8, -123.6, 
    -123.4, -123.2, -123, -122.8, -122.6, -122.4, -122.2, -122, -121.8, 
    -121.6, -121.4, -121.2, -121, -120.8, -120.6, -120.4, -120.2, -120, 
    -119.8, -119.6, -119.4, -119.2, -119, -118.8, -118.6, -118.4, -118.2, 
    -118, -117.8, -117.6, -117.4, -117.2, -117, -116.8, -116.6, -116.4, 
    -116.2, -116, -115.8, -115.6, -115.4, -115.2, -115, -114.8, -114.6, 
    -114.4, -114.2, -114, -113.8, -113.6, -113.4, -113.2, -113, -112.8, 
    -112.6, -112.4, -112.2, -112, -111.8, -111.6, -111.4, -111.2, -111, 
    -110.8, -110.6, -110.4, -110.2, -110, -109.8, -109.6, -109.4, -109.2, 
    -109, -108.8, -108.6, -108.4, -108.2, -108, -107.8, -107.6, -107.4, 
    -107.2, -107, -106.8, -106.6, -106.4, -106.2, -106, -105.8, -105.6, 
    -105.4, -105.2, -105, -104.8, -104.6, -104.4, -104.2, -104 ;

 depth = 0, 25, 50, 75, 100, 125, 150, 175, 200, 225, 250, 275, 300, 325, 
    350, 375, 400, 425, 450, 475, 500, 525, 550, 575, 600, 625, 650, 675, 
    700, 725, 750, 775, 800, 825, 850, 875, 900, 925, 950, 975, 1000 ;
}

The ncks utility

The ncks or nc kitchen sink, is a versatile tool from the netCDF Command line Operators (NCO ) package that lets you manipulate the netCDF files. Below are a few examples of how to use ncks to extract data from the DNA09 netCDF data file, DNA09_percent.nc.

  • Extract a single variable (dvs)
  • Extract dvs for latitudes between 40° and 45°
  • Extract dvs for latitudes between 40° and 45° and longitudes between -123° & -122°:

Extract a single variable (dvs):

ncks -v dvs -C DNA09_percent.nc

	dvs: type NC_FLOAT, 3 dimensions, 4 attributes, chunked? no, compressed? no, packed? no, ID = 3
dvs RAM size is 41*86*106*sizeof(NC_FLOAT) = 373756*4 = 1495024 bytes
dvs dimension 0: depth, size = 41 NC_FLOAT, dim. ID = 0 (CRD)
dvs dimension 1: latitude, size = 86 NC_FLOAT, dim. ID = 2 (CRD)
dvs dimension 2: longitude, size = 106 NC_FLOAT, dim. ID = 1 (CRD)
dvs attribute 0: long_name, size = 27 NC_CHAR, value = Shear Velocity Perturbation
dvs attribute 1: display_name, size = 32 NC_CHAR, value = Shear Velocity  Perturbation (%)
dvs attribute 2: missing_value, size = 1 NC_FLOAT, value = 99999
dvs attribute 3: _FillValue, size = 1 NC_FLOAT, value = 99999

depth[0]=0 latitude[0]=32 longitude[0]=-125 dvs[0]=0 
depth[0]=0 latitude[0]=32 longitude[1]=-124.8 dvs[1]=0 
depth[0]=0 latitude[0]=32 longitude[2]=-124.6 dvs[2]=0 
depth[0]=0 latitude[0]=32 longitude[3]=-124.4 dvs[3]=0 
depth[0]=0 latitude[0]=32 longitude[4]=-124.2 dvs[4]=0 
depth[0]=0 latitude[0]=32 longitude[5]=-124 dvs[5]=0 
depth[0]=0 latitude[0]=32 longitude[6]=-123.8 dvs[6]=0 
depth[0]=0 latitude[0]=32 longitude[7]=-123.6 dvs[7]=0 
depth[0]=0 latitude[0]=32 longitude[8]=-123.4 dvs[8]=0 
depth[0]=0 latitude[0]=32 longitude[9]=-123.2 dvs[9]=0 
depth[0]=0 latitude[0]=32 longitude[10]=-123 dvs[10]=0 
depth[0]=0 latitude[0]=32 longitude[11]=-122.8 dvs[11]=0.001 
depth[0]=0 latitude[0]=32 longitude[12]=-122.6 dvs[12]=0.001 
depth[0]=0 latitude[0]=32 longitude[13]=-122.4 dvs[13]=-0.001 
depth[0]=0 latitude[0]=32 longitude[14]=-122.2 dvs[14]=-0.003 
depth[0]=0 latitude[0]=32 longitude[15]=-122 dvs[15]=-0.004 
depth[0]=0 latitude[0]=32 longitude[16]=-121.8 dvs[16]=-0.003 
depth[0]=0 latitude[0]=32 longitude[17]=-121.6 dvs[17]=-0.001 
depth[0]=0 latitude[0]=32 longitude[18]=-121.4 dvs[18]=0 
depth[0]=0 latitude[0]=32 longitude[19]=-121.2 dvs[19]=0.001 
depth[0]=0 latitude[0]=32 longitude[20]=-121 dvs[20]=0.002 
depth[0]=0 latitude[0]=32 longitude[21]=-120.8 dvs[21]=0.004 
depth[0]=0 latitude[0]=32 longitude[22]=-120.6 dvs[22]=0.006 
depth[0]=0 latitude[0]=32 longitude[23]=-120.4 dvs[23]=0.011 
depth[0]=0 latitude[0]=32 longitude[24]=-120.2 dvs[24]=0.022 
depth[0]=0 latitude[0]=32 longitude[25]=-120 dvs[25]=0.033 
depth[0]=0 latitude[0]=32 longitude[26]=-119.8 dvs[26]=0.025 
depth[0]=0 latitude[0]=32 longitude[27]=-119.6 dvs[27]=0.007 
depth[0]=0 latitude[0]=32 longitude[28]=-119.4 dvs[28]=-0.009 
depth[0]=0 latitude[0]=32 longitude[29]=-119.2 dvs[29]=-0.033 
depth[0]=0 latitude[0]=32 longitude[30]=-119 dvs[30]=-0.057 
depth[0]=0 latitude[0]=32 longitude[31]=-118.8 dvs[31]=-0.057 
depth[0]=0 latitude[0]=32 longitude[32]=-118.6 dvs[32]=-0.009 
depth[0]=0 latitude[0]=32 longitude[33]=-118.4 dvs[33]=0.035 
depth[0]=0 latitude[0]=32 longitude[34]=-118.2 dvs[34]=0.034 
   .
   .
   .

Extract dvs for latitudes between 40° and 45°:

cks -v dvs -d latitude,40.0,45.0 -C DNA09_percent.nc
NOTE:latitude limits must be real, otherwise they will be taken to be ranges of the latitude index rather than their range of values. 

dvs: type NC_FLOAT, 3 dimensions, 4 attributes, chunked? no, compressed? no, packed? no, ID = 3
dvs RAM size is 41*86*106*sizeof(NC_FLOAT) = 373756*4 = 1495024 bytes
dvs dimension 0: depth, size = 41 NC_FLOAT, dim. ID = 0 (CRD)
dvs dimension 1: latitude, size = 86 NC_FLOAT, dim. ID = 2 (CRD)
dvs dimension 2: longitude, size = 106 NC_FLOAT, dim. ID = 1 (CRD)
dvs attribute 0: long_name, size = 27 NC_CHAR, value = Shear Velocity Perturbation
dvs attribute 1: display_name, size = 32 NC_CHAR, value = Shear Velocity  Perturbation (%)
dvs attribute 2: missing_value, size = 1 NC_FLOAT, value = 99999
dvs attribute 3: _FillValue, size = 1 NC_FLOAT, value = 99999

depth[0]=0 latitude[40]=40 longitude[0]=-125 dvs[4240]=-0.087 
depth[0]=0 latitude[40]=40 longitude[1]=-124.8 dvs[4241]=-0.144 
depth[0]=0 latitude[40]=40 longitude[2]=-124.6 dvs[4242]=-0.25 
depth[0]=0 latitude[40]=40 longitude[3]=-124.4 dvs[4243]=-0.401 
depth[0]=0 latitude[40]=40 longitude[4]=-124.2 dvs[4244]=-0.583 
depth[0]=0 latitude[40]=40 longitude[5]=-124 dvs[4245]=-0.711 
depth[0]=0 latitude[40]=40 longitude[6]=-123.8 dvs[4246]=-0.781 
depth[0]=0 latitude[40]=40 longitude[7]=-123.6 dvs[4247]=-0.497 
depth[0]=0 latitude[40]=40 longitude[8]=-123.4 dvs[4248]=-0.153 
depth[0]=0 latitude[40]=40 longitude[9]=-123.2 dvs[4249]=0.187 
depth[0]=0 latitude[40]=40 longitude[10]=-123 dvs[4250]=-0.364 
depth[0]=0 latitude[40]=40 longitude[11]=-122.8 dvs[4251]=-1.069 
depth[0]=0 latitude[40]=40 longitude[12]=-122.6 dvs[4252]=-1.777 
depth[0]=0 latitude[40]=40 longitude[13]=-122.4 dvs[4253]=-1.537 
depth[0]=0 latitude[40]=40 longitude[14]=-122.2 dvs[4254]=-1.139 
depth[0]=0 latitude[40]=40 longitude[15]=-122 dvs[4255]=-0.712 
depth[0]=0 latitude[40]=40 longitude[16]=-121.8 dvs[4256]=-0.563 
depth[0]=0 latitude[40]=40 longitude[17]=-121.6 dvs[4257]=-0.538 
depth[0]=0 latitude[40]=40 longitude[18]=-121.4 dvs[4258]=-0.61 
depth[0]=0 latitude[40]=40 longitude[19]=-121.2 dvs[4259]=-0.743 
   .
   .
   .

Extract dvs for latitudes between 40° and 45° and longitudes between -123° & -122°:

ncks -v dvs -d latitude,40.0,45.0 -d longitude,-123.0,-122.0 -C DNA09_percent.nc
NOTE:latitude and longitude limits must be real, otherwise they will be taken to be ranges of the latitude and/or longitude index rather than their range of values. 

 dvs: type NC_FLOAT, 3 dimensions, 4 attributes, chunked? no, compressed? no, packed? no, ID = 3
dvs RAM size is 41*86*106*sizeof(NC_FLOAT) = 373756*4 = 1495024 bytes
dvs dimension 0: depth, size = 41 NC_FLOAT, dim. ID = 0 (CRD)
dvs dimension 1: latitude, size = 86 NC_FLOAT, dim. ID = 2 (CRD)
dvs dimension 2: longitude, size = 106 NC_FLOAT, dim. ID = 1 (CRD)
dvs attribute 0: long_name, size = 27 NC_CHAR, value = Shear Velocity Perturbation
dvs attribute 1: display_name, size = 32 NC_CHAR, value = Shear Velocity  Perturbation (%)
dvs attribute 2: missing_value, size = 1 NC_FLOAT, value = 99999
dvs attribute 3: _FillValue, size = 1 NC_FLOAT, value = 99999

depth[0]=0 latitude[40]=40 longitude[10]=-123 dvs[4250]=-0.364 
depth[0]=0 latitude[40]=40 longitude[11]=-122.8 dvs[4251]=-1.069 
depth[0]=0 latitude[40]=40 longitude[12]=-122.6 dvs[4252]=-1.777 
depth[0]=0 latitude[40]=40 longitude[13]=-122.4 dvs[4253]=-1.537 
depth[0]=0 latitude[40]=40 longitude[14]=-122.2 dvs[4254]=-1.139 
depth[0]=0 latitude[40]=40 longitude[15]=-122 dvs[4255]=-0.712 
depth[0]=0 latitude[41]=40.2 longitude[10]=-123 dvs[4356]=-0.618 
depth[0]=0 latitude[41]=40.2 longitude[11]=-122.8 dvs[4357]=-1.304 
depth[0]=0 latitude[41]=40.2 longitude[12]=-122.6 dvs[4358]=-1.967 
depth[0]=0 latitude[41]=40.2 longitude[13]=-122.4 dvs[4359]=-1.608 
depth[0]=0 latitude[41]=40.2 longitude[14]=-122.2 dvs[4360]=-1.247 
depth[0]=0 latitude[41]=40.2 longitude[15]=-122 dvs[4361]=-0.887 
depth[0]=0 latitude[42]=40.4 longitude[10]=-123 dvs[4462]=-0.846 
depth[0]=0 latitude[42]=40.4 longitude[11]=-122.8 dvs[4463]=-1.535 
depth[0]=0 latitude[42]=40.4 longitude[12]=-122.6 dvs[4464]=-2.03 
depth[0]=0 latitude[42]=40.4 longitude[13]=-122.4 dvs[4465]=-1.681 
depth[0]=0 latitude[42]=40.4 longitude[14]=-122.2 dvs[4466]=-1.331 
depth[0]=0 latitude[42]=40.4 longitude[15]=-122 dvs[4467]=-0.97 
depth[0]=0 latitude[43]=40.6 longitude[10]=-123 dvs[4568]=-0.254 
depth[0]=0 latitude[43]=40.6 longitude[11]=-122.8 dvs[4569]=-0.786 
depth[0]=0 latitude[43]=40.6 longitude[12]=-122.6 dvs[4570]=-1.132 
depth[0]=0 latitude[43]=40.6 longitude[13]=-122.4 dvs[4571]=-1.004 
depth[0]=0 latitude[43]=40.6 longitude[14]=-122.2 dvs[4572]=-0.848 
depth[0]=0 latitude[43]=40.6 longitude[15]=-122 dvs[4573]=-0.633 
depth[0]=0 latitude[44]=40.8 longitude[10]=-123 dvs[4674]=0.406 
depth[0]=0 latitude[44]=40.8 longitude[11]=-122.8 dvs[4675]=0.094 
depth[0]=0 latitude[44]=40.8 longitude[12]=-122.6 dvs[4676]=-0.11 
depth[0]=0 latitude[44]=40.8 longitude[13]=-122.4 dvs[4677]=-0.138 
depth[0]=0 latitude[44]=40.8 longitude[14]=-122.2 dvs[4678]=-0.139 
depth[0]=0 latitude[44]=40.8 longitude[15]=-122 dvs[4679]=-0.068 
depth[0]=0 latitude[45]=41 longitude[10]=-123 dvs[4780]=0.691 
depth[0]=0 latitude[45]=41 longitude[11]=-122.8 dvs[4781]=0.501 
depth[0]=0 latitude[45]=41 longitude[12]=-122.6 dvs[4782]=0.381 
depth[0]=0 latitude[45]=41 longitude[13]=-122.4 dvs[4783]=0.312 
depth[0]=0 latitude[45]=41 longitude[14]=-122.2 dvs[4784]=0.255 
depth[0]=0 latitude[45]=41 longitude[15]=-122 dvs[4785]=0.255 
   .
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Citations and DOIs

To cite IRIS DMC Data Products effort:

  • Trabant, C., A. R. Hutko, M. Bahavar, R. Karstens, T. Ahern, and R. Aster (2012), Data Products at the IRIS DMC: Stepping Stones for Research and Other Applications, Seismological Research Letters, 83(5), 846–854, https://doi.org/10.1785/0220120032.

To cite IRIS Earth Model Collaboration (EMC) data product or reference use of its repository:

To cite the source or reference the use of a particular Earth model hosted by EMC:

Credits

  • IRIS EMC

Contact

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Earth Models

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22:46:10 v.3514fbed