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Geochemical and Geomorphological Analyses on Liquefaction Occurred During the 2012 Emilia Seismic Sequence

Conference paper
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Abstract

On May 20th and 29th, 2012 two earthquakes (ML 5.9 with hypocenter depth at 6.3 km and ML 5.8 with hypocenter depth at 10.2 km, respectively; ISIDe Database 2010) struck the Emilia area. The epicentre was located in the vicinity of Finale Emilia and Medolla (Modena). Co-seismic effects exemplified by liquefactions and surface ruptures occurred in the surrounding area (Provinces of Bologna, Ferrara, Modena, Reggio Emilia, Mantova and Rovigo). The maximum effects where concentrated along the towns located 15–25 km from the epicentre (SW portion of Ferrara Province). Soon after the main events, several geochemical and geophysical surveys were carried out in different sites at Modena and Ferrara Provinces, where surface rupture and liquefaction effects were most evident. Results gained from soil and dissolved gases and geoelectrical-geophysical surveys evidenced that the main liquefied layer is related to a medium coarse-grained sand saturated aquifer located at 8–12 m b.g.l. On the other hand, superficial unsaturated sediments underwent liquefaction represented by densification and lateral spreading. As a consequence, liquefied soil caused ground failures and damages to the built environment. The extent of the liquefaction phenomena, its concentration along the Reno paleo-river ridge and the building damage, has highlighted the need to further characterized the possible rule of lithology and natural gas content on the outset of liquefaction.

Keywords

Liquefaction Surface ruptures Soil gas Electrical resistivity tomography Induced polarization 

References

  1. Abu Zeid N, Bignardi S, Caputo R, Santarato G, Stefani M (2012) Electrical resistivity tomography investigations on liquefaction and fracturing phenomena at San Carlo, Italy. Ann Geoph 55(4):713–716. doi: 10.4401/ag-6152
  2. Annunziatellis A, Beaubien SE, Bigi S, Ciotoli G, Coltella M, Lombardi S (2008) Gas migration along fault systems and through the vadose zone in the Latera caldera (central Italy): Implications for CO2 geological storage. Int J Greenhousegas Control 2:353–372CrossRefGoogle Scholar
  3. Burrato P, Vannoli P, Fracassi U, Basili R, Valensise G (2012) Is blind faulting truly invisible? Tectonic-controlled drainage evolution in the epicentral area of the May 2012, Emilia-Romagna earthquake sequence (northern Italy). Ann Geophys 55(4):525–531. doi: 10.4401/ag-6182 Google Scholar
  4. Ciotoli G, Lombardi S, Morandi S, Zarlenga F (2005) A multidisciplinary statistical approach to study the relationships between helium leakage and neo-tectonic activity in a gas province: The Vasto Basin, Abruzzo-Molise (central Italy). AAPG Bull 88(3):355–372CrossRefGoogle Scholar
  5. Ciotoli G, Lombardi S, Annunziatellis A (2007) Geostatistical analysis of soil gas data in a high seismic intermontane basin: Fucino Plain, central Italy. J Geoph Res 112:B05407. doi: 10.1029/2005JB004044 Google Scholar
  6. Elliot T, Ballantine CJ, O’Nions RK, Ricchiuto T (1993) Carbon, helium, neon and argon isotopes in a Po Basin (northern Italy) natural gas field. Chem Geol 106:429–440CrossRefGoogle Scholar
  7. Etiope G, Lombardi S (1995) Evidence for radon transport by carrier gas through faulted clays in Italy. J Radioanal Nucl Chem 193(2):291–300CrossRefGoogle Scholar
  8. Hinkle M (1994) Environmental conditions affecting concentrations of He, CO2, O2 and N2 in soil gases. Appl Geochem 9:53–63CrossRefGoogle Scholar
  9. ISIDe Working Group (INGV 2010) Italian Seismological Instrumental and Parametric Database, http://iside.rm.ingv.it
  10. Loke MH (2004) 2-D and 3-D electrical imaging surveys. PDF available from http://www.geoelectrical.com/
  11. Loke MH, Barker RD (1996) Rapid least-squares inversion of apparent resistivity pseudosections by a quasi-Newton method. Geophys Prospect 44:131–152CrossRefGoogle Scholar
  12. Lombardi S, Voltattorni N (2010) Rn, He and CO2 soil gas geochemistry for the study of active and inactive faults. Appl Geoch 25:1206–1220CrossRefGoogle Scholar
  13. Minissale A, Magro G, Martinelli G, Vaselli O, Tassi F (2000) Fluid geochemical transect in the Northern Apennines (central-northern Italy): fluid genesis and migration and tectonic implications. Tectonophysics 319:199–222CrossRefGoogle Scholar
  14. Quattrocchi F, Guerra M, Pizzino L, Lombardi S (1999) Radon and helium as pathfinders of fault systems and groundwater evolution in different Italian areas. Il Nuovo Cimento 22(3–4):309–316Google Scholar
  15. Reimer GM (1980) Use of soil-gas helium concentrations for earthquake prediction: Limitations imposed by diurnal variation. J Geophys Res 85(31):07–3114Google Scholar
  16. Sciarra A, Cantucci B, Buttinelli M, Galli G, Nazzari M, Pizzino L, Quattrocchi F (2012) Soil gas survey on liquefaction and collapsed caves during the Emilia seismic sequence. The Emilia (northern Italy) seismic sequence of May-June, 2012: preliminary data and results. Ann Geophys 55(4):803–809. doi: 10.4401/ag-6152 Google Scholar
  17. Sciarra A, Cinti D, Pizzino L, Procesi M, Voltattorni N, Mecozzi S, Quattrocchi F (2013) Geochemistry of shallow aquifers and soil gas surveys in a feasibility study at the Rivara natural gas storage site (Po Plain, Northern Italy). Appl Geochem 34:3–22CrossRefGoogle Scholar
  18. Tassi F, Bonini M, Montegrossi G, Capecchiacci F, Capaccioni B, Vaselli O (2012) Origin of hydrocarbons in gases from mud volcanoes and CH4-rich emissions. Chem Geol 294(295):113–126CrossRefGoogle Scholar

Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.Istituto Nazionale di Geofisica e VulcanologiaRomeItaly
  2. 2.Dipartimento di Fisica e Scienze della TerraUniversità di FerraraFerraraItaly

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