In this case, the opposing experts reported different directions or
orientations for the direction of movement measured in a number
of slope inclinometers. Coincidently, the different directions
supported the different causation hypotheses that were being
advanced by the two experts. One example of the difference in the
calculated vectors for this case is one expert reported the direction
of movement as S47°E, while the first author reported the directionof the inclinometer as S37°W. The vectors developed by the
opposing expert pointed to the location of maximum grading, 6.7
m, which the expert believed caused the slide by removing toe
support. The vectors calculated by the first author pointed to a
location with only 1.8 to 2.4 m of grading and thus concluded that
this surficial grading did not trigger the large and deep (about 37
m) landslide. After considerable debate, it was determined that the
difference in the vectors was caused by an error in measuring the
direction of the A0 axis because of the presence of a metal casing as
described previously.
Case