Pedzisa mutsara unotevera: Nemhaka yenhoroondo yayo yokubudisa kudengenyeka kwenyika kukuru (1857, 1906) nzvimbo inokosha yokuongorora ngozi yokudengenyeka muCalifornia yave iri San Andreas System yezvikanganiso. Zvisinei, gadziriro yezvikanganiso, kusanganisira Sierra Madre<unk>Cucamonga Fault System iyo inomhanya pamuganhu weSan Gabriel neSan Fernando Valleys, yakakonzerawo nhevedzano yezviitiko zvine mwero kusvika kune zvakakura muGreater Los Angeles Area. Chikamu chokumadokero zvikurusa cheiyi gadziriro yokutsauka chakaputsika muna
1971 uye yakaonekwa seimwe yenzira nhanhatu huru dzokuputsika dzinoparira tyisidziro kunharaunda ine vanhu vakawanda.