Bárðar­bunga in Iceland

Vol­ca­nol­o­gist Ingi Þor­lei­fur Bjar­na­son has ex­pressed  to The Civil Pro­tec­tion that pre­cau­tions should be made in the pos­si­ble sce­nario of an erup­tion at Bárðar­bunga. 

"Due to a lack of deeper un­der­stand­ing of the av­er­age mea­sure­ments of earth­quakes in Bárðar­bunga I think peo­ple should be care­ful to de­clare that there is­n't a slight­est pos­si­bil­ity of an erup­tion at Bárðar­bunga," ex­plains Bjar­na­son to Morgun­blaðið to­day. The other pos­si­bil­i­ties are that the erup­tion at Holuhraun will con­tinue or that a fis­sure un­der­neath the glac­ier will start erupt­ing. "I have ex­pressed my opin­ion to The Civil Pro­tec­tion to put em­pha­sis on re­ac­tions to a pos­si­ble erup­tion at Bárðar­bunga, an erup­tion which could cause the most dam­age."

Ac­cord­ing to the Sci­en­tific Ad­vi­sory Board of the Ice­landic Civil Pro­tec­tion the to­tal de­pres­sion of the caldera is 50 me­ters (164 ft.) and the to­tal vol­ume of the de­pres­sion about 1,4 cu­bic kilo­me­tre (0.334 cu­bic miles) since the seis­mic ac­tiv­ity started in mid-Au­gust. 

This is the largest sub­si­dence that has been mea­sured in mod­ern times at a caldera in Ice­land.

The last 24 hours two earth­quakes, more than M5.0 have been de­tected at Bárðar­bunga. The first, M5.2 at 12:52 oc­curred in the south­east­ern part of the caldera rim and the sec­ond, M5.4 at 02:18 in the north­east­ern part of the rim. Some earth­quakes be­tween 4 and 5 have also been de­tected. Ca 70 earth­quakes (30 more than at the same time yes­ter­day) have oc­curred at Bárðar­bunga the last 24 hours. Few small earth­quakes have been de­tected in the dyke in­tru­sion.

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