Parameterization of historical earthquakes in Switzerland |
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| Authors: | Sonia álvarez-Rubio Philipp K?stli Donat F?h Souad Sellami Domenico Giardini |
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| Institution: | (1) Swiss Seismological Service, ETH Zurich, Sonneggstrasse 5, CH-8092 Z?rich, Switzerland |
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| Abstract: | Macroseismic earthquake parameters of historical events have been reassessed in the framework of the update of the Earthquake
Catalogue of Switzerland ECOS-09. The Bakun and Wentworth method (Bakun and Wentworth 1997) has been used to assess location, magnitude, and, when possible, focal depth. We apply a two-step procedure. Intensity attenuation
is assessed first by fitting a model with a logarithmic and a linear term, using a set of 111 earthquakes. The magnitude range
is 3 and 5.8. Then, intensity to magnitude relation is developed. A subset of the 111 events, all having an instrumental moment
magnitude, was used to perform this intensity to magnitude calibration. Five final calibration strategies were developed based
on different intensity calibration datasets, regionalized or non-regionalized models, and fixed or variable source depth.
The final assessment of the macroseismic earthquake parameters is based on an expert judgment procedure, using the results
derived from all five strategies, and taking into consideration the historical knowledge available for the particular earthquake.
A bootstrap procedure has been applied to assess the uncertainty of parameters. Indicative lower and upper bounds of uncertainty
are derived from distributions of location and magnitude for a number of events, obtained through bootstrap sampling of the
intensity field and of the single intensity values. The final uncertainties are given in terms of parameter uncertainty classes
already used in previous versions of the earthquake catalogue of Switzerland. |
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