Geodetic vs. geologic measures of fault slip rates of the Carboneras fault in the Betics
- 1RISKNAT, Geomodels Institute, Department of Earth and Ocean Dynamics, Universitat de Barcelona, 08028 Barcelona, Spain
- 2University of Chieti-Pescara, Italy
As part of the recently initiated research project, we are in the process of studying in detail the geodynamic behavior of the Carboneras fault (CF) in the SE Betics in Spain. Specifically, we plan to quantify the geodetic and geologic slip rates for the on-land section of the fault, as well as getting some insight on the state of locking of the fault. As a result of our previous GPS observations, we have been able to illustrate the continuing tectonic activity of the Carboneras fault, expressed mainly as a left-lateral strike slip motion of 1.3±0.2 mm/yr, with a less significant compression of 0.4±0.2 mm/yr (Echeverria et al., 2015). To reveal how the deformation is partitioned between different structures, in the last years 2 new continuous GPS points were established along the fault-perpendicular profile. In addition, we have conducted several surveys of the nearby CuaTeNeo and IGN Regente points and established and measured several new geodetic points in the vicinity of the Carboneras fault. The updated horizontal geodetic slip rates for the CF are 1.1±0.2 and 0.4±0.3 mm/yr in fault parallel and perpendicular directions, respectively. These estimates are somewhat smaller than previously published results, although considering the uncertainties, are statistically equivalent.
The above-mentioned geodetic, short-term, slip rates deduced from GNSS observations, are in good agreement with the estimates of geologic slip rates based on paleoseismic and geomorphologic studies, which indicate a minimum strike-slip rate of 1.3 mm/yr and dip-slip rate of 0.05 mm/yr since 110.3 ka (Moreno et al. 2015). In the coming years we plan to conduct further geodetic surveys and paleoseismic trenching surveys. These new data, should significantly improve the reliability of the existent deformation data and therefore, contribute to better understanding of the seismic hazard posed by the Carboneras fault in the SE Betics.
Project NSOURCES (PID2020-119772RB-I00) financed by MCIN/AEI/10.13039/501100011033
How to cite: Khazaradze, G., Gómez-Novell, O., Ortuño, M., Masana, E., and Pallàs, R.: Geodetic vs. geologic measures of fault slip rates of the Carboneras fault in the Betics, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-13443, https://doi.org/10.5194/egusphere-egu23-13443, 2023.
