Data Publication

High-speed digital image correlation data from laboratory subduction megathrust models

Kosari, Ehsan | Rosenau , Matthias | Ziegenhagen, Thomas | Oncken, Onno

GFZ Data Services

(2022)

Descriptions

This data set includes data derived from high-speed surface displacement observations from analog earthquake experiments. The data consists of surface displacement of the experiment upper plate and slab, slip distribution, and grids of Coulomb Failure Stress (CFS). The surface displacement observations have been captured using a highspeed CMOS (Complementary Metal Oxide Semiconductor) camera (Phantom VEO 640L camera, 12 bit) and processed with LaVision Davis 10 software. Description of the experiments and results regarding the surface displacement observation, Slip distribution, and CFS 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. The presented experimental setup is modified from the 3D setup used in Rosenau et al. (2019) and Kosari et al. ( 2020 and 2022). 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. The Stick-slip sliding in rice is governed by a rate-and-state dependent friction law similar to natural rocks. A flat-top (surface slope α=0) wedge overlies rectangular stick-slip patch/es over a 15-degree dipping basal thrust. Two different seismic configurations of the shallow part of the wedge base (the megathrust) represent the depth extent of the seismogenic zone in nature. In the first configuration (homogeneous configuration), a single large rectangular stick-slip patch (Width*Length=200*800 mm) is implemented as the main slip patch (MSP). In the second case (heterogeneous configuration), two square-shaped MSPs (200*200mm) have been emplaced, acting as two medium-size seismogenic asperities surrounded by a salt matrix hosting frequent small events. 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 sticky-rice layer. The wedge responds elastically to these basal slip events, similar to crustal rebound during natural subduction megathrust earthquakes.

Keywords

Originally assigned keywords

EPOS

multi-scale laboratories

analogue models of geologic processes

analogue modeling results

Digital Image Correlation (DIC) / Particle Image Velocimetry (PIV) > StrainMaster (La Vision GmbH)

High frame rate camera

Time lapse camera

megathrust

Rubber

Sand > Quartz Sand

Subduction box

tectonic and structural features

tectonic process > subduction

tectonic setting > plate margin setting > active continental margin setting

tectonic setting > plate margin setting > subduction zone setting

property data of analogue modelling materials

analogue modelling results

software tools

EARTH SCIENCE > SOLID EARTH > GEOMORPHIC LANDFORMS/PROCESSES > TECTONIC PROCESSES > SUBDUCTION

EARTH SCIENCE > SOLID EARTH > TECTONICS > EARTHQUAKES

Corresponding MSL vocabulary keywords

high frame rate camera

camera

subducting plate interface

thrust fault

natural rubber

subduction box

MSL enriched keywords

Ancillary equipment

model surface monitoring (2D)

camera

high frame rate camera

tectonic plate boundary

convergent tectonic plate boundary

subduction

subducting plate interface

tectonic deformation structure

tectonic fault

thrust fault

analogue modelling material

elastic modelling material

natural elastic material

natural rubber

Apparatus

analogue modelling

deformation experiments

subduction box

Software

digital image correlation (DIC)

minerals

silicate minerals

tectosilicates

quartz

unconsolidated sediment

clastic sediment

sand

Apparatus

deformation testing

shear testing

Measured property

mechanical strength

shear strength

friction - controlled slip rate

friction coefficient

rate and state friction (RSF) parameters

Inferred deformation behavior

deformation behaviour

brittle deformation

frictional deformation

Measured property

friction - controlled slip rate

friction coefficient

rate and state friction (RSF) parameters

volcanic arc

trench

accretionary wedge

Earth's structure

Earth crust

MSL enriched sub domains i

analogue modelling of geologic processes

rock and melt physics

Source

https://dataservices.gfz-potsdam.de/panmetaworks/showshort.php?id=43118e89-d842-11ec-9531-ca1f3ed77ce8

Source publisher

GFZ Data Services