Data Publication

Mechanical data from rotary shear experiments on material derived from outcrops felsic and mafic rocks in the East African Rift Zone

Nina Hellebrekers

Utrecht University

(2019)

Descriptions

In all experiments, multiple series of velocity-steps were performed to obtain the velocity dependence of friction. The data can be modeled using rate-and-state friction equations (see Marone, 1998). We used the rate-and-state friction tool included in the XLOOK program to invert the data for all RSF parameters. For more details on the inversions scheme, see e.g. Reinen and Weeks, 1993. The excel-files included give the best fit values for the different parameters and different velocity steps. In some cases, one state variable was sufficient to get a satisfactory fit, in other cases two were needed. Note that steps that led to unstable stick-slips proved very difficult to model, since the sliding velocity tends to go to infinity (no damping included in the model). However, in most if not all cases, a result of the inversion could be found that was satisfactory, at least for the initial sliding after the step. Finally, in some cases a long term linear hardening or weakening trend was present, which was corrected. The data is provided in a folder with 14 subfolders for 14 experiments/samples. Detailed information about the files in these subfolders as well as information on how the data is processed is given in the explanatory file Hellebrekers_et_al_2019_Data_explanation.docx. Contact person is André Niemeijer - Projectleader - a.r.niemeijer@uu.nl

Keywords

Originally assigned keywords

Natural Sciences - Earth and related environmental sciences (1.5)

Rotary shear

Powder mixture

quartzo-feldsphatic gneiss

mafic gneiss

Friction

Imposed slip > Rate-State

Axial strain grauge

Earthquakes

Rate and State Friction

Brittle-ductile transition

EPOS

multi-scale laboratories

rock and melt physics properties

Corresponding MSL vocabulary keywords

rotary shear apparatus

friction coefficient

frictional deformation

friction coefficient

shear testing

rate and state friction (RSF) parameters

brittle-ductile deformation

MSL enriched keywords

Apparatus

deformation testing

shear testing

rotary shear apparatus

Apparatus

characterization of modelling material

frictional property determination

rotary shear apparatus

Measured property

friction - controlled slip rate

friction coefficient

Inferred deformation behavior

deformation behaviour

frictional deformation

Measured property

friction - controlled slip rate

friction coefficient

rate and state friction (RSF) parameters

brittle-ductile deformation

MSL enriched sub domains i

rock and melt physics

analogue modelling of geologic processes

Source

https://public.yoda.uu.nl/geo/UU01/CLEO20.html

Source publisher

Utrecht University

DOI

10.24416/uu01-cleo20

Creators

Nina Hellebrekers

Utrecht University - Department of Earth Sciences

ORCID:

https://orcid.org/0000-0003-0399-9537

Contributors

Niemeijer, André Rik

ContactPerson

Utrecht University - Department of Earth Sciences

ORCID:

https://orcid.org/0000-0003-3983-9308

Niemeijer, André Rik

ProjectLeader

Utrecht University - Department of Earth Sciences

ORCID:

https://orcid.org/0000-0003-3983-9308

Hellebrekers, Nina

DataCollector

Utrecht University - Department of Earth Sciences

ORCID:

https://orcid.org/0000-0003-0399-9537

Fagereng, Ake

Researcher

Cardiff University

ORCID:

https://orcid.org/0000-0001-6335-8534

Manda, Blackwell

Researcher

University of Malawi

ORCID:

https://orcid.org/0000-0002-7417-7293

Mvula, Richard L.S.

Researcher

Malawi University of Science and Technology

Author identifier (Scopus):

57202039548

Experimental rock deformation/HPT-Lab (Utrecht University, The Netherlands)

HostingInstitution

Utrecht, University

References

https://doi.org/10.31223/osf.io/nu7rq

https://doi.org/10.1038/34157

https://agupubs.onlinelibrary.wiley.com/doi/10.1029/93JB00780

Citation

Hellebrekers, N. (2019). Mechanical data from rotary shear experiments on material derived from outcrops felsic and mafic rocks in the East African Rift Zone. Utrecht University. https://doi.org/10.24416/UU01-CLEO20

Dates

Updated:

2024-07-12T11:07:19

Collected:

2016-12-01/2018-03-16

Language

en

Funding References

Funder name: European Research Council (ERC)

Funder name: Dutch Research Council (NWO)

Funder name: European Research Council (ERC)

Funder name: EPSRC Global Challenges

Rights

Open - freely retrievable

Creative Commons Attribution 4.0 International Public License

Datacite version

1.0

Geo location(s)

East African Rift Zone, Malawi