Analysis of Borehole-Radar Reflection Data from Machiasport, Maine, December 2003
USGS Scientific Investigations Report 2005-5087
By Carole D. Johnson and Peter K. Joesten
http://water.usgs.gov/ogw/bgas/publications/SIR2005-5087/


Visual description of animation for Figure 7
(no audio)

Figure 7 is a computer-generated three-dimensional box plot of all radar 
reflectors identified in single-hole reflection radar logging in MW10 
from Machiasport, Maine. The box plot is used to aid in the 
visualization of radar reflectors. The video demonstrates how computer 
software allows the user to rotate or tip the cube and see the reflectors 
from multiple perspectives. 

In this representation, the borehole-radar reflectors are shown as 
disk-shaped planar features with a uniform diameter of 15 meters. The 
dimensions of the cube are 200 by 150 by 150 meters. The upper surface 
of the cube, which is shaded, represents the land surface. The northern 
side of the cube and magnetic north are indicated with a line on the 
northern side of the cube. Only reflectors whose strike and dip could be 
determined were included in the representation. 

The reflectors are color coded. Green disks in the cube plot represent 
radar reflectors that project to above the top of the open hole. Yellow 
disks in the cube plot represent radar reflectors that project to below 
the casing in the boreholes. Red and blue disks represent radar reflectors 
that could only be resolved to plus or minus 180 degrees.

The video clip starts with view looking down on the top of the box, which 
represents the land surface. Then the box is tipped so that the land surface 
is horizontal and we are able to see the radar reflectors from the southern 
side of the box. As the box is rotated towards the west, the reflectors are 
viewed from all sides.

The figure shows that the radar imaged numerous reflectors that intersect a 
line parallel to the borehole (including segments above and below the open 
borehole), and these reflectors appear to be uniformly distributed with depth. 
The disks above the land surface indicate that the radar imaged several 
reflectors in the bedrock away from the borehole, and not just features that 
intersect the open part of the borehole.

[end of animation]