Abstract
More than four hundred linear arrangements of nearly all active volcanic loci in the Indonesian island arcs have been subdivided into small (occurring on the same volcano), medium (occupying the same volcanic range), and large (interpreted connections between volcanic loci on separate cones or ranges). Two additional size-classes,i.e. small to medium and medium to large volcanic lineaments contain the transitory cases.
Analyzing the orientations of the volcanic lineaments with respect to the regional structural trends and by using the most widely accepted angle of failure of 25° 30°, it was found that more than seventy percent of the lineaments can be classified as first and second order shear, tension, and extension directions. The tension direction occurs predominantly in the large size-class contrarily to the extension direction, which is rarely large. Instead, the latter direction is most frequent as small lineaments. There are no significant differences in the number of lineaments among the six directions of failure. Almost three quarters of the remaining unclassifiable volcanic lineaments belong to the small and small to medium size-classes, which very probably rellect the influence of local structural conditions.
These data indicate conclusively that most volcanic lineaments occur along narrow zones of weakness which are genetically related to the regional structure.
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Tjia, H.D. Volcanic lineaments in the Indonesian island arcs. Bull Volcanol 31, 85–96 (1967). https://doi.org/10.1007/BF02597007
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DOI: https://doi.org/10.1007/BF02597007