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

Using data from the 2023 LiDAR, we measured the offset of canal as 85-100 cm (Fig. 7), along with an angular rotation that amounts to 75-80 cm of offset. With the angular rotation, the total offset may more closely be ~1.8 m which is more consistent with the 7.5 magnitude of the 1976 earthquake (Niemi et al., 2024). Electrical resistivity tomographic (ERT) data were collected along three lines across the 1976 earthquake rupture of the Motagua fault and parallel to two paleoseismic trenches at the Finca Los Limones site. The data were collected with a Ground Fig. 5: Photograph of the concrete irrigation canal offset by slip of 93 cm of the Motagua fault in Finca Los Limones east of Gualán. Left, February 1976; Right, July 2021. Fig. 6: Plafker archival photograph showing the repaired canal at Gualán in April 1976. Cracks, shown at the red arrow, had already started to develop on the canal suggesting afterslip. Fig. 7: Map showing 10-cm resolution slope data from the 2023 LiDAR data that highlights the sinistral displacement of the concrete irrigation canal by a total of 1.65-1.80 m.