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High-precision relocation and focal mechanism of the 2002 rain-triggered earthquake swarms at Mt. Hochstaufen, SE-Germany

Kraft, T., J. Wassermann, and H. Igel (2006), High-precision relocation and focal mechanism of the 2002 rain-triggered earthquake swarms at Mt. Hochstaufen, SE-Germany, Geophys. J. Int., 167(3), 1513-1528, doi:10.1111/j.1365-246X.2006.03171.x.

Abstract
The 2002 seismicity of Mt. Hochstaufen, SE Germany, is characterized by several swarmtype
earthquake sequences that follow above-average rainfall events. First investigations have
recently provided indication, that the rain events triggered this swarm-type activity.We present
a detailed relocation of the 2002 seismicity, which is composed of (1) cluster analysis, (2)
multievent semi-automatic phase repicking, (3) probabilistic location in a pseudo-3-D velocity
model with topography and (4) master event relocation. Furthermore, focal mechanisms of
selected events are derived by taking into account the first-motion polarities of P, SV and
SH waves. We introduce a simple methodology to test the stability and estimate the variance
of the focal mechanisms solutions.
Location uncertainties of less than 100 m were achieved. The hypocentres are mainly concentrated
between 1000mabove and 4000mbelow sea level and aligned on two planes, which,
however, cannot be associated with geological structures with reasonable certainty. Swarmtype
activity follows above-average rain events and shows a depth migration of hypocentres
over time. Evidence that the rain events triggered the earthquake swarms is reported by Hainzl
et al. (2006) on basis of our relocation. The derived focal mechanisms seem to indicate an
influence of the Saalachtal Fault Zone on the stress regime of the study area.
Key words: cluster analysis, focal mechanism determination, master event relocation, microearthquake
swarm, probabilistic non-linear inversion, rainfall-triggered seismicity.
BibTeX
@article{id396,
  author = {T. Kraft and J. Wassermann and H. Igel},
  journal = {Geophys. J. Int.},
  number = {3},
  pages = {1513-1528},
  title = {{High-precision relocation and focal mechanism of the 2002 rain-triggered earthquake swarms at Mt. Hochstaufen, SE-Germany}},
  volume = {167},
  year = {2006},
  doi = {10.1111/j.1365-246X.2006.03171.x},
}
EndNote
%0 Journal Article
%A Kraft, T.
%A Wassermann, J.
%A Igel, H.
%D 2006
%N 3
%V 167
%J Geophys. J. Int.
%P 1513-1528
%T High-precision relocation and focal mechanism of the 2002 rain-triggered earthquake swarms at Mt. Hochstaufen, SE-Germany
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