Surface displacement and strain data from laboratory subduction megathrust earthquake cycles

Cite as:

Kosari, Ehsan; Rosenau, Matthias; Metzger, Sabrina; Oncken, Onno (2023): Surface displacement and strain data from laboratory subduction megathrust earthquake cycles. GFZ Data Services. https://doi.org/10.5880/GFZ.4.1.2023.005

Status

I N R E V I E W : Kosari, Ehsan; Rosenau, Matthias; Metzger, Sabrina; Oncken, Onno (2023): Surface displacement and strain data from laboratory subduction megathrust earthquake cycles. GFZ Data Services. https://doi.org/10.5880/GFZ.4.1.2023.005

Abstract

This data set is digital image correlation data, including surface displacement and strain data from laboratory subduction megathrust earthquake cycles. The data consists of grids of surface strain (elastic and permanent), trench-normal surface displacement, vorticity and divergence maps over analog seismic cycles, and time series of surface displacement. The data have been derived using a stereo camera setup and processed with LaVision Davis 10 software. Detailed descriptions of the experiments and results regarding the surface pattern of the strain can be found in Kosari et al. (2023), to which this data set is supplementary.

We use three configurations to mimic the along-strike heterogeneous spatiotemporal distribution of frictional locking (Rosenau et al., 2019; Kosari et al., 2022b). A central patch separates two stick-slip zones as an aseismic barrier in all configurations. The frictional properties of the central patch vary as a velocity-strengthening (VS configuration), a velocity-neutral (VN), and a velocity-weakening (VW configuration). The VW zone generates smaller slip events with a higher frequency (i.e., recurrence interval) than the stick-slip zones. Four frictionally different materials have been emplaced on the interface: The sticky-rice as velocity-weakening material (a-b<0) resulting in stick-slip cycles simulating earthquake cycles, fine-grained sugar and rubber-sand mixture as velocity-strengthening (a-b>0) and velocity-neutral (a-b=0) material, and fine-grained salt as velocity-weakening material (a-b<0) (Kosari et al., 2023).

Authors

Kosari, Ehsan;GFZ German Research Centre for Geosciences, Potsdam, Germany
Rosenau, Matthias;GFZ German Research Centre for Geosciences, Potsdam, Germany
Metzger, Sabrina;GFZ German Research Centre for Geosciences, Potsdam, Germany
Oncken, Onno;GFZ German Research Centre for Geosciences, Potsdam, Germany

Contact

Kosari, Ehsan (Research Scientist) ; GFZ German Research Centre for Geosciences, Potsdam, Germany;
Rosenau, Matthias (Senior Scientist (Lab Manager)) ; GFZ German Research Centre for Geosciences, Potsdam, Germany;

Contributors

HelTec - Helmholtz Laboratory for Tectonic Modelling (GFZ German Research Centre for Geosciences, Germany)

Keywords

Seismotectonic modeling, Analog Modeling, Digital Image Correlation (DIC), Particle Image Velocimetry (PIV), EPOS, multi-scale laboratories, analogue models of geologic processes, analogue modelling results