Pedzisa mutsara unotevera: Nemhaka yenhoroondo yayo yokubereka kudengenyeka kukuru (1857,
1906) chinhu chinonyanya kukosheswa pakuongorora njodzi dzinokonzerwa nokudengenyeka muCalifornia kwave kuri kudengenyeka kweSan 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 yokuvhiringidzika chakaputsika muna 1971 uye chakazivikanwa kuva chimwe chezvinhu zvitanhatu zvikuru zvinovhiringidza gadziriro yokuvhiringidzika izvo zvinomutsa tyisidziro kunharaunda ine vanhu vakawanda.