Video: Hom kev tawg ua li cas Mt St Helens muaj?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Mt . St . Helens feem ntau generates explosive pyroclastic tawg , nyob rau hauv sib piv rau ntau lwm Cascade volcanoes, xws li Mt . Rainier uas feem ntau generates kuj tsis-explosive tawg ntawm lava.
Yog li ntawd, dab tsi yog qhov nto moo tshaj plaws tawg ntawm Mount St Helens?
Mount St . Helens yog feem ntau notorious rau nws loj tawg nyob rau lub Tsib Hlis 18, 1980, tus neeg tuag thiab feem ntau kev lag luam puas tsuaj volcanic xwm txheej nyob rau hauv US keeb kwm. Tsib caug xya tus neeg raug tua; 250 lub tsev, 47 txuas hniav, 15 mais (24 km) ntawm txoj kev tsheb ciav hlau, thiab 185 mais (298 km) ntawm txoj kev loj raug rhuav tshem.
Tsis tas li ntawd, thaum twg yog lub sijhawm kawg ntawm Mt St Helens tau tawg loj? Helens xyoo 1980. On Peb Hlis 18, 1980 , av qeeg tau tsoo hauv qab sab qaum teb ntawm Mount St. Helens hauv xeev Washington, ua rau muaj av qeeg loj tshaj plaws hauv keeb kwm uas tau sau tseg thiab muaj hluav taws kub tawg loj uas tau tawg cov tshauv hla ntau lub xeev.
Ua raws li qhov no, dab tsi tsim Mount St Helens?
Volcanism tshwm sim ntawm Mount St . Helens thiab lwm cov volcanoes nyob rau hauv Cascades arc vim subduction ntawm Juan de Fuca phaj tawm sab hnub poob ntug dej hiav txwv ntawm North America. Qhov chaw ntawm magma tsim, tsub zuj zuj, thiab cia hauv qab Mount St . Helens (qhov chaw yog inferred los ntawm scientific cov ntaub ntawv).
Mount St Helens siab npaum li cas ua ntej tawg?
Qhov siab siab tam sim no kwv yees li 8,300 ko taw. Keeb kwm qhov siab ua ntej eruption 9, 677 yib.
Pom zoo:
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