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Data Publication
Digital image correlation data from laboratory subduction megathrust models
Kosari, Ehsan | Rosenau, Matthias | Oncken, Onno
GFZ Data Services
(2022)
This data set includes digital image correlation data from analog earthquakes experiments. The data consists of grids of surface strain and time series of surface displacement (horizontal and vertical) and strain. 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. (2022), to which this data set is supplementary. We use an analog seismotectonic scale model approach (Rosenau et al., 2019 and 2017) to generate a catalog of analog megathrust earthquakes (Table 1). The presented experimental setup is modified from the 3D setup used in Rosenau et al. (2019) and Kosari et al. ( 2020). The subduction forearc model wedge is set up in a glass-sided box (1000 mm across strike, 800mm along strike, and 300 mm deep) with a dipping, elastic basal conveyor belt and a rigid backwall. An elastoplastic sand-rubber mixture (50 vol.% quartz sandG12: 50 vol.% EPDM rubber) is sieved into the setup representing a 240 km long forearc segment from the trench to the volcanic arc. The shallow part of the wedge includes a basal layer of sticky rice grains characterized by unstable stick-slip sliding representing the seismogenic zone. Stick-slip sliding in rice is governed by a rate-and-state dependent friction law similar to natural rocks. According to Coulomb wedge theory (Dahlen et al., 1984), two types of wedge configurations have been designed: a “compressional” configuration represents an interseismically compressional and coseismically stable wedge (compressional configuration), and a “critical” configuration, which is interseismically stable (close to critically compressional) and may reach a critical extensional state coseismically (critical configuration). In the compressional configuration, a flat-top (surface slope α=0) wedge overlies a single large rectangular in map view stick-slip patch (Width*Length=200*800 mm) over a 15-degree dipping basal thrust. In the critical configuration, the surface angle of the elastoplastic wedge varies from the coastal segment onshore (α=10) to the inner-wedge offshore (α=15) segments over a 5-degree dipping basal thrust. Slow continuous compression of the wedge by moving the basal conveyor belt at a speed velocity of 0.05 mm/s simulates plate convergence and results in the quasi-periodic nucleation of quasi-periodic stick-slip events (analog earthquakes) within the rice layer. The wedge responds elastically to these basal slip events, similar to crustal rebound during natural subduction megathrust earthquakes.
Keywords
Originally assigned keywords
Corresponding MSL vocabulary keywords
MSL enriched keywords
MSL original sub domains
MSL enriched sub domains i
Source publisher
GFZ Data Services
DOI
10.5880/fidgeo.2022.015
Authors
Kosari, Ehsan
0000-0002-1052-4997
GFZ German Research Centre for Geosciences, Potsdam, Germany
Rosenau, Matthias
0000-0003-1134-5381
GFZ German Research Centre for Geosciences, Potsdam, Germany
Oncken, Onno
0000-0002-2894-480X
GFZ German Research Centre for Geosciences, Potsdam, Germany
References
Kosari, E., Rosenau, M., & Oncken, O. (2022). Strain Signals Governed by Frictional‐Elastoplastic Interaction of the Upper Plate and Shallow Subduction Megathrust Interface Over Seismic Cycles. Tectonics, 41(5). Portico. https://doi.org/10.1029/2021tc007099
10.1029/2021TC007099
IsSupplementTo
Adam, J., Urai, J. L., Wieneke, B., Oncken, O., Pfeiffer, K., Kukowski, N., Lohrmann, J., Hoth, S., van der Zee, W., & Schmatz, J. (2005). Shear localisation and strain distribution during tectonic faulting—new insights from granular-flow experiments and high-resolution optical image correlation techniques. Journal of Structural Geology, 27(2), 283–301. https://doi.org/10.1016/j.jsg.2004.08.008
10.1016/j.jsg.2004.08.008
Cites
Kosari, E., Rosenau, M., Bedford, J., Rudolf, M., & Oncken, O. (2020). On the Relationship Between Offshore Geodetic Coverage and Slip Model Uncertainty: Analog Megathrust Earthquake Case Studies. Geophysical Research Letters, 47(15). Portico. https://doi.org/10.1029/2020gl088266
10.1029/2020GL088266
Cites
Rosenau, M., Corbi, F., & Dominguez, S. (2017). Analogue earthquakes and seismic cycles: experimental modelling across timescales. Solid Earth, 8(3), 597–635. https://doi.org/10.5194/se-8-597-2017
10.5194/se-8-597-2017
Cites
Rosenau, M., Horenko, I., Corbi, F., Rudolf, M., Kornhuber, R., & Oncken, O. (2019). Synchronization of Great Subduction Megathrust Earthquakes: Insights From Scale Model Analysis. Journal of Geophysical Research: Solid Earth, 124(4), 3646–3661. Portico. https://doi.org/10.1029/2018jb016597
10.1029/2018JB016597
Cites
Contact
Kosari, Ehsan
ehsan@gfz-potsdam.de
GFZ German Research Centre for Geosciences, Potsdam, Germany
Citiation
Kosari, E., Rosenau, M., & Oncken, O. (2022). Digital image correlation data from laboratory subduction megathrust models [Data set]. GFZ Data Services. https://doi.org/10.5880/FIDGEO.2022.015