Volcanism and seismicity in the Indo-Australian seismic belt: manifestations of intraplate tectonics

P. HEDERVARI

Abstract


Disregarding the mid-oceanic ridges, the oceanic part of the Indo-
Australian Seismic Belt is the longest, seismically active zone in the
world-ocean. It begins west of Ceylon and runs towards Australia. The
oceanic part does not show any correlation with seismologically important
submarine features, such as transform faults, rift valleys or oceanic
trenches. On the basis of the distribution of earthquake-epicenters the
author supposes that the belt does not end at the westernmost coast of
Australia but penetrates the continent and can be detected as far as
south of Tasmania (Fig. 1). The length of the belt as a whole thus is
some 11800 km out of which the length of its oceanic part measures about
6500 km, which is much longer than an oceanic trench area or the island
arc, associated with it. The medium width of the belt is 1300 km. All
the shocks are of shallow origin.
The belt is characterized by a very mild volcanism; three submarine
eruptions are known from the volcanological literature and two further

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DOI: https://doi.org/10.4401/ag-4745

Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X