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An aerial picture taken on September 14, 2014 shows the Bardarbunga volcano spewing lava and smoke in southeast Iceland. The Bardarbunga volcano system has been rocked by hundreds of tremors daily since mid-August, prompting fears the volcano could explode. Bardarbunga, at 2,000 metres (6,500 feet), is Iceland's second-highest peak and is located under Europe's largest glacier, Vatnajoekull. BERNARD MERIC/AFP/Getty Images ( 533456381 )

An aerial picture taken on September 14, 2014 shows fire and smoke rising from the Bardarbunga volcano in southeast Iceland. The Bardarbunga volcano system has been rocked by hundreds of tremors daily since mid-August, prompting fears the volcano could explode. Bardarbunga, at 2,000 metres (6,500 feet), is Iceland's second-highest peak and is located under Europe's largest glacier, Vatnajoekull. BERNARD MERIC/AFP/Getty Images ( 533454866 )

An aerial picture taken on September 14, 2014 shows lava flowing out of the Bardarbunga volcano in southeast Iceland. The Bardarbunga volcano system has been rocked by hundreds of tremors daily since mid-August, prompting fears the volcano could explode. Bardarbunga, at 2,000 metres (6,500 feet), is Iceland's second-highest peak and is located under Europe's largest glacier, Vatnajoekull. BERNARD MERIC/AFP/Getty Images ( 533454847 )

An aerial picture taken on September 14, 2014 shows lava flowing out of the Bardarbunga volcano in southeast Iceland. The Bardarbunga volcano system has been rocked by hundreds of tremors daily since mid-August, prompting fears the volcano could explode. Bardarbunga, at 2,000 metres (6,500 feet), is Iceland's second-highest peak and is located under Europe's largest glacier, Vatnajoekull. BERNARD MERIC/AFP/Getty Images ( 533454802 )

An aerial picture taken on September 14, 2014 shows a plane flying over the Bardarbunga volcano spewing lava and smoke in southeast Iceland. The Bardarbunga volcano system has been rocked by hundreds of tremors daily since mid-August, prompting fears the volcano could explode. Bardarbunga, at 2,000 metres (6,500 feet), is Iceland's second-highest peak and is located under Europe's largest glacier, Vatnajoekull. BERNARD MERIC/AFP/Getty Images ( 533456457 )

An aerial picture taken on September 14, 2014 shows fire and smoke rising from the Bardarbunga volcano in southeast Iceland. The Bardarbunga volcano system has been rocked by hundreds of tremors daily since mid-August, prompting fears the volcano could explode. Bardarbunga, at 2,000 metres (6,500 feet), is Iceland's second-highest peak and is located under Europe's largest glacier, Vatnajoekull. BERNARD MERIC/AFP/Getty Images ( 533454875 )

An aerial picture taken on September 14, 2014 shows lava flowing out of the Bardarbunga volcano in southeast Iceland. The Bardarbunga volcano system has been rocked by hundreds of tremors daily since mid-August, prompting fears the volcano could explode. Bardarbunga, at 2,000 metres (6,500 feet), is Iceland's second-highest peak and is located under Europe's largest glacier, Vatnajoekull. BERNARD MERIC/AFP/Getty Images ( 533454856 )

An aerial picture taken on September 14, 2014 shows the Bardarbunga volcano spewing lava and smoke in southeast Iceland. The Bardarbunga volcano system has been rocked by hundreds of tremors daily since mid-August, prompting fears the volcano could explode. Bardarbunga, at 2,000 metres (6,500 feet), is Iceland's second-highest peak and is located under Europe's largest glacier, Vatnajoekull. BERNARD MERIC/AFP/Getty Images ( 533456407 )

An aerial picture taken on September 14, 2014 shows lava and smoke flowing out of the Bardarbunga volcano in southeast Iceland. The Bardarbunga volcano system has been rocked by hundreds of tremors daily since mid-August, prompting fears the volcano could explode. Bardarbunga, at 2,000 metres (6,500 feet), is Iceland's second-highest peak and is located under Europe's largest glacier, Vatnajoekull. BERNARD MERIC/AFP/Getty Images ( 533454832 )