Ramba uchinyora ndima iyi - Mugwagwa unotsemura mvura unopfuura nomuHilo Bay wakatanga kuvakwa mumakore gumi okutanga ezana remakore rechi20 uye wakapera muna 1929. Musi waApril 1, 1946, kudengenyeka kwenyika kwakakura 7.8
pedyo neAleutian Islands yakakonzera tsunami yakarova Hilo maawa 4.9 gare gare, ichiuraya vanhu 160. Mukupindura, gadziriro yokunyevera kwokutanga, Pacific Tsunami Warning Center, yakatangwa muna 1949 kuti itarise aya mafungu anouraya ndokupa nyevero. Tsunami iyi yakakonzerawo kuguma kweHawaii Consolidated Railway, uye panzvimbo pezvo Hawaii Belt Road yakavakwa kuchamhembe kweHilo ichishandisa zvimwe zvechitima chekare.