Mud Volcano The Sidoarjo mud flow or Lapindo mud, also informally abbreviated as Lusi, a contraction of Lumpur Sidoarjo (lumpur is the Indonesian word for mud), is a mud volcano in the subdistrict of Porong, Sidoarjo in East Java, Indonesia that has been ongoing since May 2006. Approximately 2,500 m³ (88,000 cubic feet) of mud are expelled per day, which is equivalent to the contents of a dozen Olympic-size swimming pools. It is expected that the flow will continue for the next 30 years. As of November 2008, the Sidoarjo mud flow is contained by levees, but further breakouts are possible.