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| Titel |
Strain, Stress and Seismicity pattern in Switzerland |
| VerfasserIn |
Nicolas Houlie, Jochen Woessner, Arturo Villiger, Nicholas Deichmann, Markus Rothacher, Domenico Giardini, Alain Geiger |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250078573
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| Zusammenfassung |
| Switzerland lies across one of the most complex plate boundary in the world. With a 100 Ma
of deformation history, and a wide diversity of deformation mechanism, it is an ideal place
to study the link(s) between small strain rates measured at the surface and stress
dissipated at depth. The link is of genuine interest for seismic hazard assessment as
it provides an independent estimate for moment release within the seismogenic
volume.
We use geodetic (GPS velocities, shortening axes, strain maps) and seismic
(anisotropy, P-axes, focal mechanisms) datasets in order to assess whether the stress
accumulated at depth due to the continental collision reflects the deformation rates
measured at the surface and correlates with the seismic activity as well as the stress
directions deduced from earthquake focal mechanisms throughout the area - or
not.
While the deformation amplitudes of the area are small (less than 10-7 yr-1) in some
areas of Switzerland, we can relate long- and short-term features of the tectonic processes
occurring over the last 10+ Ma. Preliminary results suggest that while deformation rates
measured by GPS are large in the Ticino compared to the Valais region - its seismic activity
rate is lower. This implies other processes might play important roles in the generation of
seismicity. |
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