Abegunrin, Ayobami; Ikari, Matt J; Saffer, Demian M; Zhang, Junli; Kopf, Achim J: Laboratory friction results of samples from the Nankai Trough Ashizuri transect [dataset bundled publication]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.995896 (dataset in review)
Abstract:
Despite the availability of drilling core samples from scientific expeditions, published friction data from the Nankai Trough Ashizuri transect are limited compared to those from the Kumano and Muroto counterparts. This dataset presents laboratory friction results from samples obtained along the Ashizuri transect, elucidating their potential implications for unstable slip behavior. Nine representative sediment samples from two sites (297 and 1177), drilled on the pre-subduction incoming sediments, were investigated. We conducted single direct-shear experiments under an effective normal stress of 10 MPa, employing velocity-stepping procedures with driving velocities ranging from the Nankai Trough plate rate of ~0.002 µm/s (~6 cm/yr) to 30 µm/s on both intact and powder samples. The measured coefficient of friction (μ) showed two distinct groups: μ<0.3 for clayey samples rich in phyllosilicates (55-65%) and μ>0.5 for sandy samples low in phyllosilicates (10-20%). At slow velocities comparable to the plate rate, the velocity-step test revealed predominantly velocity-weakening frictional behavior for Site 297 samples, whereas Site 1177 samples were more velocity-strengthening. Additionally, Stick-slip cycles were observed in sample 1177-46R-01 at driving velocities of 0.1, 0.3, 1, 3, and 10 μm/s. Over this velocity range, the stress drop correlates negatively with the recurrence interval and positively correlates with the average slip velocity. The dataset provides evidence of unstable slip in frictionally weak, clay-rich samples, a condition necessary for earthquake slip. Such materials are expected to slide stably based on previous work.
Keyword(s):
Related to:
Abegunrin, Ayobami; Ikari, Matt J; Saffer, Demian M; Zhang, Junli; Kopf, Achim J (submitted): Slip Instability in the Nankai Trough - Insights from the Ashizuri Transect.
Coverage:
Median Latitude: 31.318306 * Median Longitude: 134.077417 * South-bound Latitude: 30.872700 * West-bound Longitude: 134.011880 * North-bound Latitude: 31.652510 * East-bound Longitude: 134.164800
Date/Time Start: 1973-07-15T00:00:00 * Date/Time End: 2000-06-30T02:22:00
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Size:
7 datasets
Download Data (login required; moratorium until 2028-07-17)
Datasets listed in this bundled publication
- Abegunrin, A; Ikari, MJ; Saffer, DM et al. (in review): Sample details from the Nankai Trough Ashizuri transect. https://doi.pangaea.de/10.1594/PANGAEA.995829
- Abegunrin, A; Ikari, MJ; Saffer, DM et al. (in review): Friction experiment details and measurements from the Nankai Trough Ashizuri transect. https://doi.pangaea.de/10.1594/PANGAEA.995836
- Abegunrin, A; Ikari, MJ; Saffer, DM et al. (in review): Velocity-dependent friction measurements, forward modeling from the Nankai Trough Ashizuri transect. https://doi.pangaea.de/10.1594/PANGAEA.995875
- Abegunrin, A; Ikari, MJ; Saffer, DM et al. (in review): Velocity-dependent friction measurements, inverse modeling results (aging law) from the Nankai Trough Ashizuri transect. https://doi.pangaea.de/10.1594/PANGAEA.995877
- Abegunrin, A; Ikari, MJ; Saffer, DM et al. (in review): Stick-Slip details for ODP sample 190-1177A-46R-01 from the Nankai Trough Ashizuri transect. https://doi.pangaea.de/10.1594/PANGAEA.995892
- Abegunrin, A; Ikari, MJ; Saffer, DM et al. (in review): Velocity-dependent friction measurements, inverse modeling results slip law from the Nankai Trough Ashizuri transect. https://doi.pangaea.de/10.1594/PANGAEA.995889
- Abegunrin, A; Ikari, MJ; Saffer, DM et al. (in review): Peak and residual coefficient of friction computed from the run-in phase of each of the experiment from the Nankai Trough Ashizuri transect. https://doi.pangaea.de/10.1594/PANGAEA.995893