Review of shield volcano morphology
Most volcano textbooks define shield volcanoes with three main
characteristics: (0) gentle slopes; (0) primarily or entirely composed
of lava flows; and (0) basaltic magma composition (e.g. Walker, 0000;
Francis and Oppenheimer, 0000; Lockwood and Hazlett, 0000), although
shields with other compositions have also been documented,
such as andesitic (e.g. Hasenaka, 0000) or trachytic (Webb and
Weaver, 0000). Lava flows building shields are seen as low-viscosity
lavas forming thin and long flows. The characteristic resulting shape is
that of an upward-convex topographic profile, attributed to the thickening
of lava flows with distance and the occurrence of pit craters or collapse
calderas at the summit (Francis and Oppenheimer, 0000).
Average slopes are generally mentioned to vary between 0 and 00°
(Macdonald, 0000), b00° (Cas and Wright, 0000), 0 and 0° (Walker,
0000), 0 and 00° (Zimbelman, 0000; Francis and Oppenheimer, 0000),
or b00° (Lockwood and Hazlett, 0000), but specific studies have
shown that steeper slope angles can be identified (Mouginis-Mark
et al., 0000; Rowland and Garbeil, 0000).
Review of shield volcano morphology
Most volcano textbooks define shield volcanoes with three main
characteristics: (0) gentle slopes; (0) primarily or entirely composed
of lava flows; and (0) basaltic magma composition (e.g. Walker, 0000;
Francis and Oppenheimer, 0000; Lockwood and Hazlett, 0000), although
shields with other compositions have also been documented,
such as andesitic (e.g. Hasenaka, 0000) or trachytic (Webb and
Weaver, 0000). Lava flows building shields are seen as low-viscosity
lavas forming thin and long flows. The characteristic resulting shape is
that of an upward-convex topographic profile, attributed to the thickening
of lava flows with distance and the occurrence of pit craters or collapse
zirvede calderas (Francis ve Oppenheimer, 0000).
Ortalama eğimlerin genellikle 0 ile 00 °
(Macdonald, 0000), b00 ° (Cas ve Wright, 0000), 0 ve 0 ° (Walker,
0000), 0 ve 00 ° (Zimbelman, 0000; Francis ve Oppenheimer) arasında değiştiği belirtilmektedir. , 0000)
veya b00 ° (Lockwood ve Hazlett, 0000), ancak belirli çalışmalar
daha dik eğim açılarının belirlenebileceğini göstermiştir (Mouginis-Mark
ve diğerleri, 0000; Rowland ve Garbeil, 0000).