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In 2006 a mud volcano eruption took place in Sidoarjo area about 20 km South of Surabaya, the capital city of East Java Province, Indonesia. The eruption caused heavy environmental impact due to the l...arge amount of mud erupted. There were controversial opinions about the generation of the eruption. The first opinion suspected the oil exploration well drilled in the area as the prime trigger. In contrary, the second opinion pointed out the role of earthquake and the existence of Watukosek fault extending in the area. The present study aims to reveal the subsurface structural characteristics of the area including the confirmation of the existence of Watukosek fault which might be contributive to the settlement of the controvercy.. The methods applied in this study are surface conventional data collections and subsurface seismic surveys. The results showed that the eruption was generated and controlled by the reactivation of Watukosek fault which gave a passage for mud to pierce to the surface. The fault also connected the heat source of Penanggungan-Arjuno Welirang and the mud eruption system. It was concluded that the Sidoarjo mud eruption was a geothermal system occurred in clastic materials. The specific phenomenon was the geyser type of mud eruption rarely found in sedimentary host rocks.続きを見る
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Mendeley出力
