Description
Prior paleoseismic work at Carrizo Wash along the Superstition Mountain strand of the San Jacinto fault demonstrated recurrent late Holocene faulting. However, an erosional unconformity in the initial excavations likely removed evidence for some past events, and correlations to nearby sites were problematic because of mismatches in the number of recognized lake units. In this study, I excavated new trenches beyond the affects of the erosional channel and found evidence for an additional event. I also found clear evidence for an additional deltalake sequence that was not present in the original exposures. These observations confirm the suspected correlation of earthquake events across multiple fault segments, as well as redefine the regional correlation of highstands for the ancient Lake Cahuilla in the western Salton Trough.
