Documentation for alinement arrays, Motagua fault, Guatemala

The following brief report documents the locations and surveying data for four alinement arrays (fig. 1, p.-7-19) across the Motagua fault, Guatemala, which were installed to measure afterslip occurring along the fault. The arrays represent new monuments installed in areas where displacements had been measured as early as four days after the earthquake. The results of those measurements are reported by Bucknam and others (1978). Because of lack of monument stability, the susceptibility to damage of the various monuments used in the earlier work, and the need for more precise measurements because of decreasing rate of slip, the new monuments were installed at the four sites in May 1978.