Sigurlaug Hjaltadottir, a geophysicist with Iceland's Meteorological Office, says seismic activity at the Eyjafjallajokul volcano has decreased in recent weeks, though the eruption has not yet been declared officially over.

Eyjafjallajokull (pronounced ay-yah-FYAH-lah-yer-kuhl) erupted April 14 for the first time in almost two centuries.

Danger to planes from the volcanic ash plume led most northern European countries to close airspace April 15-20, grounding about 10 million travelers worldwide.

Iceland's Civil Protection Agency says the main hazard now is from mud flows caused by ash mixing with heavy rain.