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http://hdl.handle.net/2122/15213
Authors: | Fonseca, Joao* Palano, Mimmo* Falcão, Ana Paula* Hrysiewicz, Alexis* Fernández, José* |
Title: | Interseismic Strain Accumulation Near Lisbon (Portugal) From Space Geodesy | Journal: | Geophysical Research Letters | Series/Report no.: | 24/48 (2021) | Publisher: | Wiley-AGU | Issue Date: | 21-Dec-2021 | DOI: | 10.1029/2021GL096862 | URL: | https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2021GL096862 | Keywords: | Deformation Intraplate PISinSAR GNSS Portugal |
Subject Classification: | 04. Solid Earth 04.04. Geology |
Abstract: | Abstract The Lisbon Metropolitan Area, Portugal, has been affected by several destructive earthquakes nucleating both along the offshore Africa-Eurasia plate boundary and on onshore inherited intraplate faults. Using a dense GNSS dataset coupled with PSInSAR analysis, we provide new evidence of sinistral simple shear driven by a NNE-SSW first-order tectonic lineament. PSInSAR vertical velocities corroborate qualitatively the GNSS strain-rate field, showing uplift/subsidence where the GNSS data indicate contraction/extension. We propose the presence of a small block to the W of Lisbon moving independently toward the SW with a relative velocity of 0.96 ± 0.20 mm/yr, whose boundaries are part of a complex and as yet poorly constrained strike-slip fault system, possibly rooting at depth into a simpler basement fault. Comparison between geodetic and seismic moment-rates indicates a high seismic coupling. We show that the contribution of intraplate faults to the seismic hazard in the LMA is more important than currently assumed. |
Appears in Collections: | Article published / in press |
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2021_Fonseca et al [Interseismic Strain Lisbon] GRL.pdf | Open Access published article | 3.56 MB | Adobe PDF | View/Open |
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