Publication Date:
2022-03-31
Description:
Abstract
Description:
This dataset includes the results of Particle Image Velocimetry (PIV) of one experiment on subduction megathrust earthquakes (with interacting asperities) performed at the Laboratory of Experimental Tectonics (LET) Univ. Roma Tre in the framework of AspSync, the Marie Curie project (grant agreement 658034; https://aspsync.wordpress.com). Detailed descriptions of the experiments and monitoring techniques can be found in Corbi et al. (2017). This data set is from one experiment characterized by the presence of a 7 cm wide barrier separating two asperities with equal size, geometry and friction. Here we provide PIV data relative to a 16.3 min long interval during which the experiment produces 138 analog earthquakes with an average recurrence time of 7 s. The PIV analysis yields quantitative information about the velocity field characterizing two consecutive frames, measured in this case at the model surface. For a detailed description of the experimental procedure, set-up and materials used, please refer to the article of Corbi et al. (2017) paragraph 2.
This data set has been used for: a) studying velocity variations (Fig. 2 in Corbi et al., 2021) and rupture patterns (Fig. 3a, b in Corbi et al., 2021) occurring during the velocity peak of one of the two asperities (aka trigger).
Description:
Methods
Description:
The evolution of the analog model was monitored with a digital top-view camera (PIKE-ALLIED with resolution 1600 × 1200 pixels), capturing one frame every 0.133 s. Digital images were then analyzed with MatPIV (Sveen, 2004), which is an open-source software for PIV running under the MATLAB package. This software uses a cross-correlation technique that allows calculating horizontal components (i.e., on the image plane) of surface displacement with about one tenth of a pixel of accuracy. We used the multi-pass protocol with window size of 128 x 128 pixels and 64 x 64 pixels and 50% overlap. Other information e.g., surface displacement can be easily computed from the velocity field knowing the time between frames.
Keywords:
analogue models of geologic processes
;
subduction megathrust earthquakes
;
asperities
;
multi-scale laboratories
;
EPOS
;
Analog modelling results
;
Software tools
;
deformation
;
geologic process
;
tectonic process
;
subduction
;
Digital Image Correlation (DIC) / Particle Image Velocimetry (PIV) 〉 MatPIV
;
Earthquake simulator
;
Wedge simulator
;
Gelatine
;
plate margin setting
;
subduction zones
;
thrust fault
;
Videocamera
;
EARTH SCIENCE 〉 SOLID EARTH
;
EARTH SCIENCE 〉 SOLID EARTH 〉 TECTONICS 〉 EARTHQUAKES
;
EARTH SCIENCE 〉 SOLID EARTH 〉 TECTONICS 〉 EARTHQUAKES 〉 EARTHQUAKE OCCURRENCES
;
geological process 〉 seismic activity
;
geological process 〉 seismic activity 〉 earthquake
;
science 〉 natural science 〉 earth science
;
science 〉 natural science 〉 earth science 〉 geophysics
Type:
Dataset
,
Dataset
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