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Middels kraftig jordskjelv hjemme

Kart GOOGLE Illustrasjon JK ORVIK
B = Brattvågen, E = Episenter, O = Orvika / Hellestranda, A = Ålesund, V= Vigra Lufthavn

Foto UKJENT
Fjellet som er på vei til å løsne i Storfjorden.          Det seismiske utslaget av jordskjelvet


NRK Schrödingers Katt - Fare for fjordtsunami (dårlig lyd i starten)

Det var en kompis som først kunne fortelle om jordskjelvet via messenger like før klokken tre. Mor bekreftet det “skikkelig kraftige skjelvet” via sms like etter, og som trodde det var taket som var på vei til å falle sammen. Selv om skjelvet ikke førte til store matrielle skader, er det omfanget likevell usikkert da sprekkdannelser i hus og bygninger er innrapportert.
 

“Jordskjelv - 4 på Richters skala, 6 kilometer øst for Brattvåg„

Mine første tanker gikk til Storfjorden og Åkernesremna, en gedigen fjellside på opptil 45 000 000 kubikkmeter som er på vei ut i fjorden. Denne er i konstant bevegelse, og “lener” ser mer og mer ut mot fjorden, og øker i hastighet. Nå er den snart opp mot 15 cm i året. Skip har forbud mot horn i området langs fjorden grunnet faren for ras og steinsprang.

Da er det lett å tenke seg hvilken effekt et jordskjelv har på akselereringen av fjellsiden. Spesilt når det er snakk om så kraftige skjelv som 4 på richters scala. Heldigvis så har Storfjorden et, noe begrenset, nødsystem som skal redde liv idet fjellet løsner. Det er altså ikke snakk om hvis, men når. Der er ikke kommet nok penger til nytt varslingssystem.
 

“Fjellkløften åpner seg mer enn 15cm i året, og vil løsne innen vår tid„

7.april 1934 klokken 3 på natta var sist gang dommedag rammet Storfjorden. Tafjordulykka rammet flere bygder, men værst gikk det ut over Tafjorden hvor hele bygda forsvant, og kun få overlevde. Dengang kom bølgen opp i 62 meter over normal vannstand. Fjellhammeren (3 mill kub.meter) den gang var betydlig mindre enn Åkernesremna (35-70 mill kub.meter).

Dengang kom bølga god og vel 200 meter innover land, og etterdønningene ble merket 10 mil unna rasstedet. Når Åkernesfjellet gir slepp vil det ramme store deler av Sunnmøre, og da hele Storfjorden. Likevell ønsker ikke regjeringen å støtte prosjektet med mer enn femten millioner - halvparten av det som trengs for å bygge sikringsprosjektet ved Åkernes.
 

“3 mill m³ skapte en 62m høy bølge.. Åkersnes er på 35 - 70 mill m³„

Det er ikke bare i Storfjorden vi finner farlige fjell, dette er noe som angår store deler av Norskekysten, hvorpå vi alle er utsatt når der oppstår jordskjelv. Tre faktorer vil da være faremomenter - selve skjelvets ødeleggelser, ras og steinsprang, og overflate-flodbølge (i motsetning til en tsunami som er en undervannsbølge inntil møte med land).

Dagens sikring går ut på at idet et ras blir innrapportert, så blir samtlige innbyggere oppringt av en automatisk evakueringsalarm, hvorpå flere tusen mennesker da har få minutt på å komme seg lengst opp i fjellsidene. Denne varslinga blei prød ut på 200 husstander i Juni 2006. Videre kommer varslingstyfoner som skal varsle de uten telefon.
 

“Når alarmtelefonen ringer har man få minutter på å komme seg unna„

Så får vi håpe at jordskjelv vil forbli en sjeldenhet i fjordnorge, at der ikke er skip inne i Storfjorden den dagen fjellsiden løsner, og ingen liv går tapt når dommedag igjen slår til langs Sunnmørsfjorden. Inntil den tid kommer - så får vi ta jordskjelvet som en spennende, og noe skremmende opplevelse, for de som ble rammet. Håper på få matrielle skader.

Skjelvet:
L - Nettavisen Ka faen so sje da?
L - VG Kjempeskjelv på Vestlandet
L - Dagbladet Det ristet voldsomt kraftig
L - VG Trodde det var verdens undergang
L - Sunnmørsposten Jordskjelv i Nordvest
L - Tidens Krav Telefonstorm etter jordskjelv
L - Sunnmørsposten Kraftigste jordskjelv på land siden før…

Åkernes:
L - Nettavisen Fikk tsunami-varsling
L - NRK - Schrödingers Katt Farlige fjell
L - Forskning.no Skjulte trusler i fjellsiden
L - Aftenposten Skal varsle ras og flodbølger
L - Aftenposten Gigantras truer vestlandsbygder

Ras på Sunnmøre:
L - Fjordnorge.dk Tafjord
L - Sunnmørsposten Ras i Storfjorden
L - Dagbladet En død etter ras i Geiranger
L - Nettavisen Kvinnelig padler tatt av steinras
L - NRK Møre og Rosmdal 70 år siden Tafjordulykka

[ Se flere bilder ] Kommer

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Postet Sunday, January 21st, 2007


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