When Lake Cahuilla existed, individual earthquakes caused as much as displacement. Sediments of Lake Cahuilla have shown deformation structures similar to these formed by the 1971 San Fernando earthquake in the Van Norman Reservoir of the Los Angeles Aqueduct. These deformation structures were formed by soil liquefaction. Sediments of the lake Coachella have yielded evidence of eight earthquakes, dated to have occurred between 906 – 961, 1090 – 1152, 1275 – 1347, 1588 – 1662, and 1657 – 1713. Less certain is the timing of events between 959 – 1015 and 1320 – 1489.