We congratulate Grunewald et al. (2000) on their very detailed study of pseudotachylite-bearing friction marks on andesitic blocks from block-and-ash flow deposits of Soufriere Hills volcano, Montserrat. Their observations contribute substantially to the current discussion on flow models of block-and-ash flows. In a contemporaneous study at Merapi volcano, we (Schwarzkopf and Schmincke, 2000; Schwarzkopf et al., 2001) observed the same type of structures on block surfaces of the 1998 block-and-ash flow deposits and came to similar conclusions with respect to flow mechanisms. Two aspects concerning the formation of pseudotachylites from Merapi volcano are, however, not fully in...
Friction marks on blocks from pyroclastic flows at the Soufriere Hills volcano, Montserrat: Implications for flow mechanisms: Comment: COMMENT
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Lothar M. Schwarzkopf, Hans-Ulrich Schmincke, Valentin R. Troll; Friction marks on blocks from pyroclastic flows at the Soufriere Hills volcano, Montserrat: Implications for flow mechanisms: Comment: COMMENT. Geology ; 30 (2): 190. doi: https://doi.org/10.1130/0091-7613(2002)030<0190:FMOBFP>2.0.CO;2
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