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Ash rising from an erupting volcano near Eyjafjallajokull on April 20, 2010
Tremors coming form Iceland's volcanic eruption stay strong, while the smoke and fumes have much less ash and the plume has stayed at low levels.

Huge ash clouds caused by the volcanic eruption under the southwestern Eyjafjallajokull glacier disrupted flights and paralyzed airports across northern Europe.

Scientists, however, announced strong tremors and lower plume on Wednesday, Reuters reported.

"Only the northernmost fissure is erupting now and the plume is occasionally reaching a height of 3 km (1.9 miles), but it is mostly below that," meteorological office geophysicist Steinunn Jakobsdottir told a news conference. "

"It (the plume) is kind of stable at a height of 2 to 3 km," she added.

Seismologist Bryndis Brandsdottir believes the tremors could be a sign for a lava build up or molten rock within the crater.

"The lava cannot really go anywhere. It is not flowing out of the crater, it must be accumulating there," she told Reuters.

She explained said that if the lava could get out of the crater it would flow down the north side of the mountain, where floods occurred at the beginning of the eruption last week.

Icelanders are now worried about the much larger nearby Katla volcano, which experts say often erupts following the one under the Eyjafjallajokull glacier.