EGU21-9047
https://doi.org/10.5194/egusphere-egu21-9047
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Fast and localized temperature measurements during simulated earthquakes in carbonate rocks

Giulio Di Toro1,2, Stefano Aretusini2, Arántzazu Núñez-Cascajero3, Elena Spagnuolo2, Alberto Tapetado3, and Maria Carmen Vasquez Garcia3
Giulio Di Toro et al.
  • 1University of Padova, Dipartimento di Geoscienze, Dipartimento di Geoscienze, Padova, Italy (giulio.ditoro@unipd.it)
  • 2Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy.
  • 3Universidad Carlos III de Madrid, Electronic Technology Department, Leganés, Spain

The understanding of earthquake physics is hindered by the poor knowledge of fault strength and temperature evolution during seismic slip. Experiments reproducing seismic velocity (~1 m/s) allow us to measure both the evolution of fault strength and the associated temperature increase due to frictional heating. However, temperature measurements were performed with techniques having insufficient spatial and temporal resolution. Here we conduct high velocity friction experiments on Carrara marble rock samples sheared at 20 MPa normal stress, velocity of 0.3 and 6 m/s, and 20 m of total displacement. We measure the temperature evolution of the fault surface at the acquisition rate of 1 kHz and over a spatial resolution of ~40 µmwith optical fibers conveying the infrared radiation to a two-color pyrometer. Temperatures up to 1250 °C and low coseismic fault shear strength are compatible with the activation of grain size dependent viscous creep.

How to cite: Di Toro, G., Aretusini, S., Núñez-Cascajero, A., Spagnuolo, E., Tapetado, A., and Vasquez Garcia, M. C.: Fast and localized temperature measurements during simulated earthquakes in carbonate rocks, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-9047, https://doi.org/10.5194/egusphere-egu21-9047, 2021.

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