Stoepke, Fiene; Ikari, Matt J; Cassidy, Mike; Urlaub, Morelia: Velocity-dependent friction measurements, input parameters for forward modeling on powdered gouge of ash and scoria samples from Anak Krakatau, Sunda Strait, Indonesia (Table 3) [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.973213 (dataset in review), In: Stoepke, F et al.: Direct shear experiments on powdered gouge of ash and scoria samples from Anak Krakatau, Sunda Strait, Indonesia [dataset bundled publication]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.973234 (dataset in review)
Abstract:
We performed laboratory friction experiments on simulated fault gouges of ash and scoria samples from Anak Krakatau (Sunda Strait, Indonesia), representing the two main lithologies that can be found at Anak Krakatau and measured the velocity-dependence of friction in velocity-step tests. Moreover, we have directly measured cohesion on the samples of powdered gouge of ash and scoria. The experiments were carried out using a single-direct shear device at room temperature. For the shearing tests, all samples were crushed and sieved to a grain size < 125 µm. The ash sample was tested under fluid-saturated conditions (3.5 % NaCl brine) and the scoria sample was tested under fluid-saturated (3.5 % NaCl brine) and room dry conditions. The experiments were carried out at two different effective normal loads, 2.5 and 8 MPa, to simulate different depths of a proto shear plane within the volcanic edifice.
Funding:
European Research Council (ERC), grant/award no. 948797: Slow sliding of volcanic flanks as PREcursor to catastrophic COLLAPSE
Coverage:
Latitude: -6.101944 * Longitude: 105.423056
Date/Time Start: 2017-09-01T00:00:00 * Date/Time End: 2017-09-01T00:00:00
Minimum Elevation: 0.0 m * Maximum Elevation: 0.0 m
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Type of study | Study type | Stoepke, Fiene | |||
| 2 | Experiment | Exp | Stoepke, Fiene | |||
| 3 | Sliding velocity, initial | V init | µm/s | Stoepke, Fiene | Potentiometric displacement sensor, Burster, 8712 | |
| 4 | Sliding velocity, final | V final | µm/s | Stoepke, Fiene | Potentiometric displacement sensor, Burster, 8712 | |
| 5 | Displacement | DIS | mm | Stoepke, Fiene | Potentiometric displacement sensor, Burster, 8712 | start position of modeled data |
| 6 | Displacement | DIS | mm | Stoepke, Fiene | Potentiometric displacement sensor, Burster, 8712 | end position of modeled data |
| 7 | Displacement | DIS | mm | Stoepke, Fiene | Potentiometric displacement sensor, Burster, 8712 | velocity Step, position of velocity change |
| 8 | Slip weakening rate | Δµ/Δx | 1/µm | Stoepke, Fiene | Matlab code RSFit3000, according to Skarbek and Savage (2019) | change in friction per change in displacement |
| 9 | Initial friction coefficient | µ0 | Stoepke, Fiene | |||
| 10 | Friction direct effect | a | Stoepke, Fiene | direct friction coefficient | ||
| 11 | Friction evolutionary effect, b1 | b1 | Stoepke, Fiene | first friction evolution coefficient | ||
| 12 | Friction evolutionary effect, b2 | b2 | Stoepke, Fiene | second friction evolution coefficient | ||
| 13 | Critical slip distance dc1 | dc1 | µm | Stoepke, Fiene | first critical slip distance | |
| 14 | Critical slip distance dc2 | dc2 | µm | Stoepke, Fiene | second critical slip distance | |
| 15 | Stiffness | Stiff | 1/µm | Stoepke, Fiene |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
75 data points