Simple version

Japanese version here
Drag the markers at both ends of the plot line shown on the map and press the button on the bottom left of this page to plot geological information from the surrounding areas and subsurface structure images based on seismic tomography. Seismic tomography refers to the analysis, or the output thereof, of three-dimensional distributions of subsurface physical properties using seismic waves.
Plot example (Legends for tomography images)

Seamless geological information can be superimposed on GoogleMaps
  • Earthquake epicenters (the all-Japan hypocenter catalog by the JMA)
  • Seamless digital geological map of Japan (1:200,000)® (Legend)
  • The other geological information
Data cutout and image processing have to be done upon each plot request, so it takes tens of seconds (more than 1 minute depending on the domain size) before the images are displayed. Please also refer to the Simple version, which does not allow the plot lines to be located anywhere but has a large stock of subsurface structure images plotted beforehand, which it can display instantaneously.
Select tomography data
Select frequency
Select strain rate

Vs dVs

Vp dVp

Vp Vs Poisson's ratio dVp dVs

Vp Vs Poisson's ratio dVp dVs
Data to be plotted on the map
(horizontal section)
Tomography section (section depth km; this may be left unspecified) Base map only
# Selecting more than one items results in longer plot time Geological Map
of Japan
Topography Gravity anomaly
Select hypocenter data Do not plot hypocenters

Plot all of the all-Japan hypocenter catalog by the JMA

Use detailed settings on the hypocenter data
Use detailed settings on the hypocenter data
Hypocenter catalog
Detailed settings on the magnitudes and the time period
Magnitudes -
Plot data for which the magnitude is unavailable? Yes No
Time period (JST) Year Month Day Hour Minute --->
Year Month Day Hour Minute
(Between 2 January 1922, 1:54 and 8 August 2020, 23:58)
Minimum depth km (this may be left unspecified: the same depth range that is plotted will be used)
Maximum depth km (this may be left unspecified: the same depth range that is plotted will be used)
Maximum standard error in latitude °
Maximum standard error in longitude °
Maximum standard error in depth km
Plot hypocenters which were determined with the depth fixed or by grid search?
Yes No
Event types Normal Low-frequency
Minimum number of receivers used to determine the hypocenters
Plot data for which the number of receivers is unavailable? Yes No
END
Set detailed plot options screen (to adjust the plot) Close Open
plot options
Settings on how to plot the hypocenter data
Maximum distance between the vertical section and the hypocenters km
(This criterion is used to restrict the hypocenters to be projected onto the vertical section) (This may be left unspecified)
Plot the selected region and the depth? Yes No
(The selected region is indicated by a black rectangular frame on the horizontal section. The depth is indicated by a black dotted line (with red and blue circles on both ends) on the vertical section)
Use different hypocenter plot sizes depending on the magnitude
(Data for which the magnitude is unavailable are treated as M0)
Yes (The hypocenters will be indicated by dark pink circles)
No (The hypocenters will be indicated by black circles)
Hypocenter plot size Normal Large Very large
Settings on how to plot the tomography data
# These settings are invalid when "base map only" is selected in "Select tomography data."
Confidence parameter
(Data falling short of the criterion will not be plotted) (The default values are used if this is left unspecified)
Minimum and maximum value for the color palette (Minimum) /  (Maximum)

(These may be left unspecified. Specify both limits if at all)
Number of color palette divisions
(How many numerical figures are to be plotted between the maximum and minimum of the legends)
Plot grid points used in the tomography analysis (plus + symbols)? Yes No
The rectangular faults listed below can also be included in the plot.
(They are plotted as black rectangles on the horizontal section and as black line segments on the vertical section)
 
Settings on how to plot the map (horizontal section)
Plot ocean trenches? Yes No (blue-purple dashed curves)
Plot depths of the upper surface of the Pacific plate? Yes No (light blue dashed contours)
Plot depths of the upper surface of the Philippine Sea plate? Yes No(green solid/dashed contours)
Plot active faults ? Yes No (red lines)
Plot prefecture boundaries ? Yes No (thin black dotted lines)
Plot Quaternary volcanoes ? Yes No (red rectangles)
Plot stress orientations (SHmax)? Yes No (black line segments)
Plot S-wave anisotropy (LSPD)? Yes No (dark red line segments)
Latitude/longitude of the top right (northeast) and bottom left (southwest) corners of the map
(Note: When the vertical-to-horizontal distance ratio falls below 0.67 or exceeds 1.2, the ratio is adjusted so that the longer side length remains the same)
Latitude º / Longitude º
(top right, northeast corner)
Latitude º / Longitude º
(bottom left, southwest corner)

(These may be left unspecified. Specify all elements if at all)
Settings on how to plot the vertical section
Plot topography (blue contours) Yes No
Plot the depths of the Conrad and the Moho? Yes No
(Conrad - red dotted line) (Moho - red line)
Plot the upper surface depths of the Pacific plate and the Philippine Sea plate? Yes No
(Pacific - light blue line) (Philippine - green solid/dashed line)
Select a model of the upper surface depth of the Pacific plate
Select a model of the upper surface depths of the Philippine sea plate
Plot the upper and lower limit depths of the seismogenic layer (D10 and D90)? Yes No(light purple lines)
Vertical-to-horizontal scale exaggeration ratio 1/2 1 2 5 10
Maximum depth of the plot region km (this may be left unspecified)
Maximum elevation of the plot area km (this may be left unspecified)
end
Superimpose geological information on Google Maps
[Usage] Check the checkboxes and press the bottom button
(Note 1) Selecting more than one items results in slow response.
(Note 2) Plots superposed on Google Maps are not necessarily reflected on the plot output.
(Only the items labeled as ("plottable" may be plotted if corresponding options are selected in "Set detailed plot options.")

Seamless geological information
Blank map [plottable]
Upper and lower limit depths of the seismogenic layer(D90, D10, D90-D10) [plottable]
Gravity anomaly (Bouguer anomaly; Assumed density g/cm3) [plottable]
Japan engineering geomorphlogical classification map
Average shear-wave velocity in the top 30 m


The other geological information (KML)
Active Fault Database [plottable]
Active Volcanoes Database [plottable]
Offshore Geologic Structures Database
Pacific plate iso-depth contours (Zhao et al., 1993) [plottable]
Pacific plate iso-depth contours (Fujiwara et al., 2009; J-SHIS, NIED) [plottable]
Pacific plate iso-depth contours (KNHN compiled by Hirose) [plottable]
Philippine Sea plate iso-depth contours (Nakamura and Kaneshiro, 2000, Nansei Islands) [plottable]
Philippine Sea plate iso-depth contours (Fujiwara et al., 2009; J-SHIS, NIED) [plottable]
Philippine Sea plate iso-depth contours (BNHHHN compiled by Hirose) [plottable]
Geologic strain concentration zones in northeast Japan
Rectangular faults (JSHIS, NIED)
Rectangular faults (Japan Earthquake Fault Parameters Handbook by Sato 1989) [plottable]
Rectangular faults (Japan Heterogeneous Fault Parameters Catalog by ADEP 2005)[plottable]
Crustal Stress Fields Database (stress measurements, SHmax) [plottable]
Crustal Stress Fields Database (anisotropy, LSPD) [plottable]
Historical Earthquakes (679-2008, M6.5 or greater)
Tomography domains