Anthropogenically induced subsidence in Thessaly, central Greece: new evidence from GNSS data

Panagiotis Argyrakis (), Athanassios Ganas (), Sotirios Valkaniotis, Vasilios Tsioumas (), Nikolaos Sagias () and Basil Psiloglou ()
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Panagiotis Argyrakis: University of Peloponnese
Athanassios Ganas: National Observatory of Athens
Vasilios Tsioumas: Institute of Geology and Mineral Exploration
Nikolaos Sagias: University of Peloponnese
Basil Psiloglou: National Observatory of Athens

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2020, vol. 102, issue 1, No 9, 179-200

Abstract: Abstract We combine almost 10 years of continuous GNSS observations at four permanent stations with groundwater and rainfall data to investigate subsidence patterns in the region of Thessaly, central Greece. Thessaly is a key area for studying anthropogenic versus tectonic subsidence in Greece because it is (a) characterized by overexploitation of groundwater reservoirs since the 1980s and (b) has a Twentieth-century history of shallow, normal-slip earthquakes with M > 6. We infer that anthropogenic subsidence continues at southeast Thessaly (Karla reservoir region) up to autumn of 2017 because the vertical time-series data of station STEF (Stefanovikio) reach a cumulative value of 55 cm and show a “ramp-flat” pattern that correlates with neighboring borehole data. The geodetic data from other three examined regions (city of Larissa, city of Karditsa and Klokotos) indicate ground stability. The GNSS stations in Karditsa (KRDI) and Larissa (LARM) show correlation with groundwater-level fluctuations but no subsidence. Station KLOK (Klokotos) shows a small subsiding trend (− 0.38 mm/yr) with no correlation to either groundwater levels or to rainfall patterns; therefore, its seasonal periodicity may reflect geodynamic (plate) motions.

Keywords: Thessaly; Subsidence; GNSS; Time-series; Groundwater; Hazard (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1007/s11069-020-03917-w

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