Regional model of peak ground motion in Southwestern Germany.
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| Title: | Regional model of peak ground motion in Southwestern Germany. |
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| Authors: | Zeiß, Jens1,2 (AUTHOR) jens.zeiss@gd.nrw.de, Stange, Stefan1 (AUTHOR), Brüstle, Andrea1 (AUTHOR) |
| Source: | Journal of Seismology. Dec2022, Vol. 26 Issue 6, p1105-1136. 32p. |
| Subject Terms: | *Ground motion, *Earthquake hazard analysis, *Equations of motion, *Motion |
| Geographic Terms: | Germany, Baden-Württemberg (Germany), Rhineland-Palatinate (Germany) |
| Abstract: | Ground motion prediction equations (GMPEs) and the effects of site amplifications are substantial for the assessment of seismic hazard. To investigate the regional earthquake ground motion in southwestern Germany, we fit ground motion models to observed horizontal peak ground acceleration from earthquakes with 0.9 ≤ M L ≤ 4 using the earthquake catalogue of the joint federal seismological services of Baden-Württemberg and Rhineland-Palatinate (Erdbebendienst Südwest), Germany. We use GMPEs that consider first-order geometrical spreading, first-order magnitude-scaling, and apparent anelastic attenuation. Due to indications from the data residuals, we additionally introduce a heuristically defined expression to consider Mohorovičić reflection phases, and a second-order geometrical decay term that is derived to approximate the decay of a general moment-tensor source. While the expression for the Mohorovičić reflection phases improved the data fit, the second-order decay term is hardly changing the resulting model. Averaged site deviations from the median model are incorporated to account for site effects. Depending on the local geological conditions, these deviations show a strong variability within individual seismogeographical regions. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Abstract: | Ground motion prediction equations (GMPEs) and the effects of site amplifications are substantial for the assessment of seismic hazard. To investigate the regional earthquake ground motion in southwestern Germany, we fit ground motion models to observed horizontal peak ground acceleration from earthquakes with 0.9 ≤ M L ≤ 4 using the earthquake catalogue of the joint federal seismological services of Baden-Württemberg and Rhineland-Palatinate (Erdbebendienst Südwest), Germany. We use GMPEs that consider first-order geometrical spreading, first-order magnitude-scaling, and apparent anelastic attenuation. Due to indications from the data residuals, we additionally introduce a heuristically defined expression to consider Mohorovičić reflection phases, and a second-order geometrical decay term that is derived to approximate the decay of a general moment-tensor source. While the expression for the Mohorovičić reflection phases improved the data fit, the second-order decay term is hardly changing the resulting model. Averaged site deviations from the median model are incorporated to account for site effects. Depending on the local geological conditions, these deviations show a strong variability within individual seismogeographical regions. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 13834649 |
| DOI: | 10.1007/s10950-022-10114-8 |
