| Autor: |
Wilkinson MW; Geospatial Research Ltd, Department of Earth Sciences, Durham University, Durham, DH1 3LE, UK. maxwell.wilkinson@durham.ac.uk., McCaffrey KJW; Department of Earth Sciences, Durham University, Durham, DH1 3LE, UK., Jones RR; Geospatial Research Ltd, Department of Earth Sciences, Durham University, Durham, DH1 3LE, UK., Roberts GP; Department of Earth and Planetary Sciences, Birkbeck, University of London, London, WC1E 7HX, UK., Holdsworth RE; Department of Earth Sciences, Durham University, Durham, DH1 3LE, UK., Gregory LC; School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK., Walters RJ; COMET, Department of Earth Sciences, Durham University, Durham, DH1 3LE, UK., Wedmore L; School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK., Goodall H; School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK., Iezzi F; Department of Earth and Planetary Sciences, Birkbeck, University of London, London, WC1E 7HX, UK. |
| Abstrakt: |
The temporal evolution of slip on surface ruptures during an earthquake is important for assessing fault displacement, defining seismic hazard and for predicting ground motion. However, measurements of near-field surface displacement at high temporal resolution are elusive. We present a novel record of near-field co-seismic displacement, measured with 1-second temporal resolution during the 30 th October 2016 M w 6.6 Vettore earthquake (Central Italy), using low-cost Global Navigation Satellite System (GNSS) receivers located in the footwall and hangingwall of the Mt. Vettore - Mt. Bove fault system, close to new surface ruptures. We observe a clear temporal and spatial link between our near-field record and InSAR, far-field GPS data, regional measurements from the Italian Strong Motion and National Seismic networks, and field measurements of surface ruptures. Comparison of these datasets illustrates that the observed surface ruptures are the propagation of slip from depth on a surface rupturing (i.e. capable) fault array, as a direct and immediate response to the 30 th October earthquake. Large near-field displacement ceased within 6-8 seconds of the origin time, implying that shaking induced gravitational processes were not the primary driving mechanism. We demonstrate that low-cost GNSS is an accurate monitoring tool when installed as custom-made, short-baseline networks. |
