The eruption of the Lusi mud volcano in Indonesia was caused by drilling for oil and gas, a meeting of 74 leading geologists has concluded.
Lusi erupted in May 2006 and continues to spew out boiling mud, displacing around 30,000 people in East Java.
Drilling firm Lapindo Brantas denies a nearby well was the trigger, blaming an earthquake 280km (174 miles) away.
Around 10,000 families who have lost their homes are awaiting compensation, which could run as high as $70m (£43m).