Tab sis thaum bas alt lava ntws nyob rau hauv ib qho channel lossis lava raj ntawm txoj kab nqes, lub cev tseem ceeb ntawm cov dej ntws tuaj yeem ncav cuag >30 km / h (19 mph). Nqus andesite ntws txav tsuas yog ob peb kilometers ib teev (ob peb taw ib ob) thiab tsis tshua ntev tshaj 8 km (5 mi) los ntawm lawv cov vents.
Koj puas tuaj yeem tawm bas altic lava ntws?
Nyob rau ntawm txoj kab nqes, nws cov bas altic lava txav tsis nrawm dua 10 mais (6.2 mais) ib teev. Qhov no yog me ntsis sai dua li kev taug kev, tab sis nws yog ib qho kev nyab xeeb thawj koom ruam uas koj yuav muaj peev xwm ua tau dhau mus.
Lub lava ntws nrawm tshaj plaws puas tau sau tseg?
Lub lava ntws nrawm tshaj plaws uas tau sau tseg tau tshwm sim thaum Nyiragongo, hauv tebchaws Democratic Republic of Congo, tawg rau 10 Lub Ib Hlis 1977. Lub lava, uas tawg los ntawm qhov tawg ntawm lub roob hluav taws kub, tau mus txog qhov nrawm mus txog 60km/h (40 mph).
Yuav ua li cas thaum lub roob hluav taws yuav tawg nrog andesitic ntws?
Kev tawg tawg tau nyiam los ntawm cov ntsiab lus roj ntau & siab viscosity magmas (andesitic rau rhyolitic magmas). Lub tawg tawg ntawm npuas tawg ua rau cov magma rau hauv cov kua nplaum uas txias thaum lawv poob hauv huab cua. Cov khoom no ua pyroclasts lossis volcanic tshauv.
Yuav ua li cas cov lava ntws nrawm dua bas altic lossis rhyolitic?
Yog li, bas altic magmas nyiam ua kua dej (tsawg viscosity), tab sis lawv cov viscosity tseem yog 10,000 txog 100,0000 npaug ntau dua li dej. Rhyoliticmagmas zoo li yuav muaj viscosity ntau dua, nyob nruab nrab ntawm 1 lab thiab 100 lab npaug ntawm cov dej khov dua.
