期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2008
卷号：3
出版社：IOP Publishing
摘要：Most collapse calderas can be attributed to subsidence of the magma chamber roof
along bounding sub-vertical normal faults (ring-faults) after a decompression of
the magma chamber, following eruption. Here, we present new numerical models
that use a Finite Element Method to investigate the effects of variable crustal
stratigraphy (lithology/thickness/order of strata) above a magma chamber, on
local stress field distribution and how these in turn compare with existing
criteria for ring-fault initiation. Results indicate that the occurrence and
relative distribution of mechanically different lithologies may be influential
in generating or inhibiting caldera collapse.
关键词：caldera structure, ring fault, caldera, collapse
