TY  - GEN
A1  - Pilz, Marco
A1  - Cotton, Fabrice Pierre
A1  - Razafindrakoto, Hoby Njara Tendrisoa
A1  - Weatherill, Graeme
A1  - Spies, Thomas
T1  - Regional broad-band ground-shaking modelling over extended and thick sedimentary basins
BT  - An example from the Lower Rhine Embayment (Germany)
T2  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
N2  - The simulation of broad-band (0.1 to 10 + Hz) ground-shaking over deep and spatially extended sedimentary basins at regional scales is challenging. We evaluate the ground-shaking of a potential M 6.5 earthquake in the southern Lower Rhine Embayment, one of the most important areas of earthquake recurrence north of the Alps, close to the city of Cologne in Germany. In a first step, information from geological investigations, seismic experiments and boreholes is combined for deriving a harmonized 3D velocity and attenuation model of the sedimentary layers. Three alternative approaches are then applied and compared to evaluate the impact of the sedimentary cover on ground-motion amplification. The first approach builds on existing response spectra ground-motion models whose amplification factors empirically take into account the influence of the sedimentary layers through a standard parameterization. In the second approach, site-specific 1D amplification functions are computed from the 3D basin model. Using a random vibration theory approach, we adjust the empirical response spectra predicted for soft rock conditions by local site amplification factors: amplifications and associated ground-motions are predicted both in the Fourier and in the response spectra domain. In the third approach, hybrid physics-based ground-motion simulations are used to predict time histories for soft rock conditions which are subsequently modified using the 1D site-specific amplification functions computed in method 2. For large distances and at short periods, the differences between the three approaches become less notable due to the significant attenuation of the sedimentary layers. At intermediate and long periods, generic empirical ground-motion models provide lower levels of amplification from sedimentary soils compared to methods taking into account site-specific 1D amplification functions. In the near-source region, hybrid physics-based ground-motions models illustrate the potentially large variability of ground-motion due to finite source effects.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 1371 
KW  - ground-motion modelling
KW  - site effects
KW  - scenario
KW  - random vibration
KW  - theory
KW  - hybrid modelling
Y1  - 2020
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-571655
SN  - 1866-8372
IS  - 2
ER  - 
TY  - JOUR
A1  - Pilz, Marco
A1  - Cotton, Fabrice Pierre
A1  - Razafindrakoto, Hoby Njara Tendrisoa
A1  - Weatherill, Graeme
A1  - Spies, Thomas
T1  - Regional broad-band ground-shaking modelling over extended and thick sedimentary basins
BT  - An example from the Lower Rhine Embayment (Germany)
JF  - Bulletin of earthquake engineering : official publication of the European Association for Earthquake Engineering
N2  - The simulation of broad-band (0.1 to 10 + Hz) ground-shaking over deep and spatially extended sedimentary basins at regional scales is challenging. We evaluate the ground-shaking of a potential M 6.5 earthquake in the southern Lower Rhine Embayment, one of the most important areas of earthquake recurrence north of the Alps, close to the city of Cologne in Germany. In a first step, information from geological investigations, seismic experiments and boreholes is combined for deriving a harmonized 3D velocity and attenuation model of the sedimentary layers. Three alternative approaches are then applied and compared to evaluate the impact of the sedimentary cover on ground-motion amplification. The first approach builds on existing response spectra ground-motion models whose amplification factors empirically take into account the influence of the sedimentary layers through a standard parameterization. In the second approach, site-specific 1D amplification functions are computed from the 3D basin model. Using a random vibration theory approach, we adjust the empirical response spectra predicted for soft rock conditions by local site amplification factors: amplifications and associated ground-motions are predicted both in the Fourier and in the response spectra domain. In the third approach, hybrid physics-based ground-motion simulations are used to predict time histories for soft rock conditions which are subsequently modified using the 1D site-specific amplification functions computed in method 2. For large distances and at short periods, the differences between the three approaches become less notable due to the significant attenuation of the sedimentary layers. At intermediate and long periods, generic empirical ground-motion models provide lower levels of amplification from sedimentary soils compared to methods taking into account site-specific 1D amplification functions. In the near-source region, hybrid physics-based ground-motions models illustrate the potentially large variability of ground-motion due to finite source effects.
KW  - ground-motion modelling
KW  - site effects
KW  - scenario
KW  - random vibration
KW  - theory
KW  - hybrid modelling
Y1  - 2020
U6  - https://doi.org/10.1007/s10518-020-01004-w
SN  - 1570-761X
SN  - 1573-1456
VL  - 19
IS  - 2
SP  - 581
EP  - 603
PB  - Springer
CY  - Dordrecht
ER  -