Mud Volcano is such a mud hill and formatted water emerged from earth surface through weak zone, commonly fault. The mud was deposited in huge number and in fast moment, in marine environment, had not yet compacted and soon was covered by land sediment. Plastic/elastic clay got the stress from the weight of sediment in the upper, and then perfuse like Bledug Kuwu in Purwodadi and LUSI (Lapindo’s Mud) in far eastern Sangiran. (Suwita Nugraha, Wulandari, Iwan SB)
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