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Currently, there exists 3.6 years of measurements which can define the long-term, relative stability of the electronic and optical components of several two-color geodimeters. These measurements consist of nearly simultaneous measurements of baseline lengths with different two-color geodimeters. However, because of instrument failures in the last 1.3 years, the relative stability of the instrumentation can only be assessed over the initial 2.3 years. The stability, which is expressed as a length dependent scale factor, indicate that the apparent lengths measured with one geodimeter drifts away from the second at an insignificant rate, 0.064 ± 0.051 pprn/yr. However, the standard deviation of the residuals about this trend is 0.12 ppra, which is significantly greater than the predicted 0.04 ppm standard error of length scale of one instrument relative to the second. The data from the comparison of the two instruments are also useful for estimating the change in instrument path length due to break-down and subsequent repair or replacement of one of the two instruments. When the instrument comparison data are augmented with frequent measurements of line-length made in Long Valley caldera, it becomes possible to accurately determine the size of the offset in distance when the instrumentation is changed. The results from both data sets indicate that the offset between the two instruments is length dependent. The physical mechanism for the length dependence is unknown at this time.

Monte Carlo simulation of peak-acceleration attenuation using a finite-fault uniform-patch model; a parameter study