Girgizar ƙasa
Girgizar kasa mai girman gaske 5.1 ce dake faruwa a wurare masu ƙanƙara inda glacier ke tafiyar da sauri fiye da kilomita daya a kowace shekara.
Yawan girgizar ƙasa a Greenland yana nuna kololuwar kowace shekara acikin Yuli, Agusta da Satumba, kuma adadin yana karuwa akan lokaci. Acikin binciken da aka yi amfani da bayanai daga watan Janairu 1993 zuwa watan Oktoba 2005, an gano ƙarin abubuwan da suka faru kowace shekara tun daga 2002, kuma anyi rikodin abubuwan da yawa a cikin 2005 sau biyu kamar yadda aka yi a kowace shekara. Wannan ƙaruwar adadin girgizar ƙasa a Greenland na iya zama martani ga ɗumamar yanayi.
Ruwan ruwa na Whillans Ice Stream yana haifar da raƙuman girgizar ƙasa, wani babban kogin ƙanƙara mai sauri dake zubowa daga Yammacin Antarctic Ice Sheet zuwa cikin Ross Ice Shelf.Ana fitar da fashewar igiyoyin girgizar ƙasa guda biyu a kowace rana, kowannensu yayi daidai da girgizar ƙasa mai karfin awo 7, kuma da alama suna da alaka da guguwar ruwan tekun Ross.A kowane taron yanki 96 by 193 kilometres (60 by 120 mi)na glacier yana motsawa kamar.67 metres (2.2 ft)sama da kusan mintuna 25, ya rage har tsawon sa'o'i 12,sannan yana motsa wani rabin mita. Ana yin rikodin girgizar girgizar kasa a faifan yanayi a kusa da Antarctica, har ma da nisa kamar Ostiraliya, nisan sama da kilomita 6,400. Domin motsi yana faruwa na tsawon lokaci mai tsawo-minti 10 zuwa 25-ba zai iya jin da masana kimiyya dake tsaye a kan dusar ƙanƙara mai motsi ba.[1]Ba a sani ba ko waɗannan abubuwan suna da alaƙa da ɗumamar yanayi.[1]
Duba kuma
[gyara sashe | gyara masomin]- Cryoseism
Manazarta
[gyara sashe | gyara masomin]- ↑ 1.0 1.1 http://www.scientificamerican.com/article.cfm?id=monitoring-antarctica-ice-movement-is-sticky-business Scientific American "Monitoring Antarctic Ice Movement Is a Sticky Business" June 4, 2008
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.
