ABSTRACT Kure, S., Winarta, B., Takeda, Y., Udo, K., Umeda, M., Mano, A., Tanaka, H. 2014. Effects of Mud Flows from the LUSI Mud Volcano on the Porong River estuary, Indonesia. In: Green, A.N. and Cooper, J.A.G. (eds.), Proceedings 13th International Coastal Symposium (Durban, South Africa), Journal of Coastal Research, Special Issue No. 70, pp. 568–573, ISSN 0749-0208. On May 29, 2006, mud and gases began erupting unexpectedly from a hydrocarbon exploration well near Sidoarjo, East Java, Indonesia. The eruption, called the LUSI (Lumpur Sidoarjo [Lumpur means mud in Indonesian]) mud volcano, has continued since then at rates as high as 180,000 m3 per day. The mud inundated an area in excess of 6.5 km2, in spite of attempts to contain it via the construction of a series of levees. The mud is erupting and accumulating behind the levee system. It is also being pumped into the Porong River, which then carries the mud to the ocean approximately 20 km to the east. The main objective of this study is to assess ...