Pull-Apart Structures in a Japanese Ash-Flow Tuff Resulting from Differential Compaction over Irregular Buried Topography

摘要: Near Takachiho Town, Kyushu, Japan, four welded-tuff units, which are interbedded with tuffaceous sediments and closely resemble a sequence of thin, separate ash-flow sheets, actually consist disrupted parts single originally continuous sheet. Separations between the welded units represent pull-apart structures resulting from tensional fracturing cooling upper sheet simultaneous further compaction possible flowage hotter interior over buried irregular preemption surface. After intervening voids were filled by water-transported sediments.