3D soil structure of the Mygdonian basin for site response analysis

Understanding single-station ground motion variability and uncertainty (sigma): lessons learnt from EUROSEISTEST

“…Jongmans et al 1998;Raptakis et al 1998Raptakis et al , 2000Kudo et al 2002;Manakou et al 2010). Another advantage is that this dataset can be well controlled in terms of the quality of its seismological metadata, as it refers to a relatively small, well-studied area and to events after 2003, i.e., after the modernization and densification of permanent monitoring networks in Greece.…”

Uncertainties on vs Profiles and Site Response at a Vertical Strong Motion Array

“…Scatter of similar order is also observed at all depths for the rest of the profile until bedrock with an exception close to 185 m (± 20 m) depth, where it gets the maximum value (~ 50%). At this depth a large impendence contrast between sediments and weathered bedrock is present and the observed scatter could be related with a possible inclination of the sediments-bedrock interface (Manakou et al, 2010). An average VS profile (Figure 3) is finally adopted, having in mind that the large array configuration does not allow a detail VS distribution at the very surficial layers (< 10-20 m).…”

“…A huge amount of geotechnical and geophysical surveys has been deployed at this test site during the last 22 years including seismic prospecting methods, microtremor measurements, and in-situ and laboratory geotechnical tests. The final outcome of this effort was initially a 2D soil model Raptakis et al, 2005) and recently a 3D structure (Manakou et al, 2010). Especially, at TST where a deep 3-component accelerometers down-hole array has been installed, all measurements and analyses are gathered in an effort to build the most precise and accurate possible soil model.…”

“…Currently, a set of non-invasive and invasive techniques were applied, in order to get at one site, TST, at the center of a rather shallow basin known as Mygdonian basin or EUROSEISTEST site (Jongmans et al, 1998;Raptakis et al, 2000Raptakis et al, , 2005Manakou et al, 2010;Chávez-García et al, 2014;Hannemann et al, 2014), the VS profile intended to satisfy different kinds of studies, with special emphasis, though, to site response evaluation. For the purpose of this study, 62 estimated VS profiles are analysed, their differences are reviewed, and averaged profiles are compared to each other.…”

Full-Scale Testing of a Model Structure in Euroseistest to Study Soil-Foundation-Structure Interaction

“…Subsoil stratigraphy and dynamic properties of the foundation soil at EuroProteas site are already well-documented from extended geotechnical and geophysical surveys [7,8,9]. However, in order to define the detailed soil stratigraphy immediately below the prototype structure, additional geotechnical and geophysical surveys were performed to measure the exact soil properties at site.…”