Imaging of the Critical Zone where intact bedrocks transform into regolith is an important aspect in understanding the interaction between the geological and biological process, which is one of the main goals of the Earthshape project. Scientific drilling was carried out at four locations covering different climate zones along the coastal Cordillera in Chile.
We apply active and passive seismic methods to image the deep weathering zone around the borehole locations. A major methodological focus in our work is the development and application of Bayesian inversion techniques. The results allow for the 2D and 3D extrapolation of weathering structures that were revealed by interpretations of lithological, geochemical, petrophysical and microbiological data from coring and downhole logging.

Time frame

• 2019-2024

Funding

• DFG Deutsche Forschungsgemeinschaft, SPP 1803

Principal Investigators

• Prof. Dr. Charlotte Krawczyk (GFZ Potsdam)
• Dr. Klaus Bauer (GFZ Potsdam)

Personnel

• Rahmantara Trichandi (GFZ Potsdam)

Project Website

• https://earthshape.net

Cooperations

• Prof. Dr. Friedhelm von Blanckenburg (GFZ, FU Berlin)
• Prof. Dr. Dirk Scherler (GFZ, FU Berlin)
• Prof. Dr. Klaus Bataille (Universidad de Concepcion, Chile)
• Dr. Jaime Araya Vargas (Universidad de Atacama, Copiapo, Chile)

Publications/Results

• Trichandi, R., Bauer, K., Ryberg, T., Heit, B., Araya Vargas, J., von Blanckenburg, F., Krawczyk, C. (2024): 3D shear wave velocity imaging of the subsurface structure of granite rocks in the arid climate of Pan de Azúcar, Chile, revealed by Bayesian inversion of HVSR curves. - Earth Surface Dynamics, 12, 3, 747-763. https://doi.org/10.5194/esurf-12-747-2024
• Trichandi, R., Bauer, K., Ryberg, T., Bataille, K., Krawczyk, C. (2024): Description of the Dataset “Geophysical Imaging of Deep EarthShape (GIDES): Controlled source seismic Data of Santa Gracia, Chile”.
• Trichandi, R., Bauer, K., Ryberg, T., Wawerzinek, B., Araya Vargas, J., von Blanckenburg, F., Krawczyk, C. (2023): Shear-wave velocity imaging of weathered granite in La Campana (Chile) from Bayesian inversion of micro-tremor H/V spectral ratios. - Journal of Applied Geophysics, 217, 105191. https://doi.org/10.1016/j.jappgeo.2023.105191
• Trichandi, R., Bauer, K., Ryberg, T., Krawczyk, C., Scherler, D., Bataille, K., Krawczyk, C. (2022): Combined seismic and borehole investigation of the deep granite weathering structure? Santa Gracia Reserve case in Chile. - Earth Surface Processes and Landforms, 47, 14, 3302-3316. https://doi.org/10.1002/esp.5457