Sunday, September 7, 2014

Barðarbunga at Holuhraun Update for 09/07/2014

7th September 2014 19:00 - from geoscientist on duty

Today, most of the earthquakes have been located in Bárðarbunga caldera, at the eruption site, in Dyngjujökull and at Herðubreiðatögl. The two largest events occurred this morning (M4.6 and M5.4) at 3:27 and 7:07 UTC in Bárðarbunga caldera. We have recorded about 155 earthquakes since this morning and the seismic tremor has been lower than yesterday.
Earth scientists in the field report that the eruptive activity in the northernmost part of the north-fissure has no more lava fountaining, whereas the central craters are the most active like previous days. The new fissure in the south shows no visible activity since this afternoon.

7th September 2014 13:00 - from the Scientific Advisory Board

  • The eruptive activity at Holuhraun has not decreased. Magma flow is between 100 and 200 m3/s. The lava advances by about 1 km/day and its area yesterday afternoon was around 16 km2. The eruption sites are the same as before. The eruptive intensity on the southern fissure that opened on Friday is much less than on the northern fissure that has been active since the beginning of the eruption.
  • The lava tongue now extends 11 km to the north and has reached the western main branch of Jökulsá á Fjöllum river. However, no explosive activity due to the lava and river water interaction has been observed, but steam rises from the lava. A white eruption cloud rises 3 - 4 km and is directed to the north and northeast.
  • Seismicity in the area is similar to yesterday. Around 140 earthquakes have been recorded since midnight. At 03:30 this morning, a magnitude 4.6 earthquake occurred at the rim of the Bárðarbunga caldera. Shortly after 07:00, a magnitude 5.4 earthquake occurred on the rim, one of the largest recorded since the start of the present activity. The amount of magma flow into the dyke seems to be similar to the magma erupting from the fissures.
  • The scenarios are the same as before. The factsheet from the meeting (pdf, 0.2 Mb).
from the Icelandic Met Office

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