Janneke van Ginkel
The 2019 Outstanding Student Poster and PICO (OSPP) Awards is awarded to Janneke van Ginkel for the poster/PICO entitled:
Ambivalent Amplifications – Using horizontal-to-vertical spectral ratios to characterise subsurface seismic properties (van Ginkel, J.; Ruigrok, E.; Herber, R.)
Click here to download the poster/PICO file.
Janneke van Ginkel is second year PhD student at Groningen University and the Royal Netherlands Meteorological Institute. Her PhD project focuses on the response of shallow soils to seismic events. Since the top part of the soils in the Netherlands is practically always unconsolidated, the elastic waves generated by deeper (~3000m) seated earthquakes will be subject to transformation when arriving in these layers. Detailed earthquake site response models aim to support the design and re-enforcement measures for buildings affected by seismicity. This study uses the dense borehole network in the Groningen area, northeast in the Netherlands and permanent seismometers across the Netherlands.
The poster presented at the EGU 2019 discusses a method to determine S-wave velocities in the sedimentary layer by using a combination of body-and surface wave H/V ratios retrieved from multiple approaches. Furthermore, local site amplification can directly be measured due to the presence of sensors at multiple depth levels in the borehole network. A relationship is presented between wave amplification in the upper 50m and the subsurface composition.