Proceedings of the 12th International INQUA meeting on paleoseismology, active tectonic and archaeoseismology

The maximum coseismic slip of the 1976 earthquake was a line of offset trees displaced by 3.4 m at La Laguna while the average slip was 1.08 m (Plafker, 1976). Sites with documented slip in the 1976 earthquake have been relocated and georeferenced using photographs, maps, and notes from the USGS archive of George Plafker (McEnaney and Niemi, 2021; Niemi et al., 2022). Fig. 1: Map of Guatemala showing the ERT field sites and the Motagua fault. Using these 1976 earthquake slip relocation data and field guides (Plafker, 1977, 1978), we identified three sites for geophysical and paleoseismic study (Fig. 1): 1) La Laguna on the western side of the rupture where the maximum coseismic slip was recorded, 2) a site 1.5 km east of Gualán where a concrete canal that is still visible was offset by 0.93 m in the 1976 earthquake, with afterslip measured as 1.1 m (Bucknam et al., 1978), and 3) Estanzuela, located just west