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Faults are only available at scales of greater then 1:600,000

1) Select boreholes of interest (on map and by method)
Draw Polygon
Visible Boreholes
Reset
Method:
Log type: Caliper
Technique: Eccentricity of caliper measurements.
Log type: Dipmeter
Technique: Eccentricity of resistivity measurements from the dipmeter pads.
Log type: Caliper
Technique: Rate of change of caliper measurements.
Log type: Dipmeter
Technique: Rate of change of resistivity measurements.

2) Refine the selection (using the table below the map)
Click on a table row to select borehole
Select All
Ctrl-Click to remove from selection
Select None

3) Draw Rose diagrams of the maximum horizontal stress
orientation (ShMax) for selected boreholes (up to 10)
Rose diagram: count of number of results in 10 degree segments between 000 and 360°
Rose azimuth: direction of vector mean direction
Rose error: representation of variation and statistical uncertainty in mean direction
Draw
Remove All
Rock Stress viewer

The BGS Rock Stress viewer generates rose diagrams for user selected boreholes. The rose diagrams plot the breakout orientation in the borehole. See figure:


Navigation

Move around the map by dragging the mouse in the direction you wish to travel. To zoom in or out of the map, use the plus and minus buttons on the top left of the map. Alternatively, you can use the mouse wheel to zoom in and out of the map. Holding the Shift key and dragging a rectangle allows you to zoom in to that extent.

Generating rose diagrams

The control panel on the top right of the map, leads you through the process of generating rose diagrams, using three steps:

Step 1: Select boreholes of interest (on map and by method). Use the available buttons to select either the boreholes within a user drawn polygon or all those boreholes in the visible extent. Use the method checkboxes to select by method from: The selected boreholes are shown in yellow in the table below the map.

Step 2: Refine the selection (using the table below the map). The borehole selection can then refined by interacting with the table:
Step 3: Draw Rose diagrams for selected boreholes (up to 10). Once there are 10 or less selected boreholes in the table, the rose plots can be created. Use the check boxes to choose between the following options: Click on the 'Draw' button to generate the plots, and the 'Remove All' button to remove any previously generated plots.

Displaying Fault information

Use the check box on the top left of the map to show 1:250,000 scale Fault data. Note, you may need to zoom in for Faults to become visible.



Important Information

These rose data are calculated using data derived from Evans & Brereton (1990). Since that date analysis capabilities have improved but the work has not yet been repeated. Users are warned that these data have not been checked and replicated using current international standards and as data management procedures have improved concerns have been highlighted about the precise location and data attribution of these results. Users are therefore advised to treat these results with significant caution until revised peer review data are available.
Reference: Evans, C.J. & Brereton, N.R., 1990. In situ crustal stress in the United Kingdom from borehole breakouts, in Hurst, A., Lovell, M.A., and Morton, A.C.,( Eds)., Geological applications of wireline logs : Geological Society of London Special Publication, 48, 327-338.



Further Help

For further help Email BGS.