The Faults That Appeared near Karymskii Volcano,Kamchatka on January 1-2, 1996: The Geometry and Mechanism of Generation

摘要

Unusual (for this location) events occurred near Karymskii Volcano, Kamchatka in early Januaryof 1996: a magnitude 6.9 earthquake, the simultaneous eruptions of two volcanoes, and the generation of exten-sive ground breakage. This paper is concerned with the breaks, specifically, their positions, structure, and thecharacter of the displacements. The breaks were studied with the help of trenches that were dug across them toexpose their internal structure. Crosswise profiles were constructed on some of the breaks to analyze the vari-ation of their geometry along the strike. This work revealed the specific features of the displacement episodesand whether these episodes were multiple ones, established their sequence, and suggested a mechanism of theirgeneration and the overall mechanism responsible for the deformation observed.