On STEM Of Tectonic Stress Fields In
Tsunami Regions
Author(s)
J. Irsa & A. N. Galybin
Abstract
We apply the STEM (Stress Trajectories Element Method) to investigate
changes in the stress states as a result of a great earthquake. Two regions are
considered: 1) the region affected by the great Sumatran earthquake (26th of
December 2004, 9.1M), taking into account data collected before and after the
event separately; 2) the region where the recent Japanese earthquake (11th of
March 2011, 9.0M) occurred. The latter is analysed taking into account data
collected before the event only while the former case allows one to consider the
changes in data due to the significant increase of measurements since the 2004
event. The analysis is based on the stress orientation data from the World Stress
Map (WSM) database and the geometrical model of tectonic plate boundaries.
The method has proved to be able to recover the stress fields from this type of
data with satisfactory accuracy. The modelling utilizes the Trefftz type approach
for the complex potentials in plane elastic problems and assumes continuity of
the stress vector across the tectonic plate boundaries. As a result of the modelling
we obtain stress trajectories, maximum shear stress and mean stress, and the
plate driving forces expressed in terms of normal and tangential stresses. The
results for the two time subsets revealed changes in the stress patterns induced by
the 26/12/2004 event and moreover the stress pattern before the great Sumatran
Earthquake was very similar to the one near Japan.
Keywords: world stress map, stress reconstruction, stress changes, Sumatran
earthquake, Japan earthquake.
Keywords
world stress map, stress reconstruction, stress changes, Sumatran
earthquake, Japan earthquake
Related Book
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