Table1

TABLE 1. SKEWNESS OF T-AXIS ORIENTATIONS FROM EXPECTED TREND OF THE FAULT

			Number of data with T-axis orientations		Probability that the distribution is not skewed
Data set	Expected T-axis trend (no Reidel shear)	Number of events	Less than expected azimuth	More than expected azimuth	Probability that the distribution is not skewed
Parkfield/1-D ray tracing	94.25°	508	257	251	0.82
Parkfield/3-D ray tracing	94.25°	543	271	272	1.00
Scodie lineament	93°	158	116	42	0.000000006

Note: If the probability that the distribution is not skewed is less than 0.05, then there is a 95% or greater chance that the data set is skewed and that Reidel shear is present.