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Abukuma accumulated Aizu Akahani Akahani-yama andesitic Apatite appearance ascended ashes fell augite Bandai-san Biwa-sawa boulders caused cloud conical holes crater crater-wall crystals debris descended described district dust earth and rocks earthquake Echigo ejected erup explosion falling stones fire fissure flank forests fragments fumaroles gradually ground ground-mass heard height Hibara Iwaki Iwashiro Japan July kilm Kushigamine Lake Inawashiro late eruption lava lightning magnetite mass metres per second miles mineral mountain mud-field mud-stream Nakashima nearly Numano-taira observed Odlum old crater origin peaks phenomena plagioclase PLATE porphyritic probably produced Prof prominent Prov pumice ravine rhombic pyroxene river Nagase rock and earth rumbling sea-level seen seismic Shimotsuke side of Bandai side-wall slight shock smoke soil solfatara sound specific gravity square kilometres square miles strata summit surface Survey thick thundering tion torrent trees vertical village violent volcanic eruptions volcanic outbursts wind