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Journal Articles Nature Communications Year : 2018

Persistent CO$_2$ emissions and hydrothermal unrest following the 2015 earthquake in Nepal

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Abstract

Fluid–earthquake interplay, as evidenced by aftershock distributions or earthquake-induced effects on near-surface aquifers, has suggested that earthquakes dynamically affect permeability of the Earth’s crust. The connection between the mid-crust and the surface was further supported by instances of carbon dioxide (CO$_2$) emissions associated with seismic activity, so far only observed in magmatic context. Here we report spectacular non-volcanic CO$_2$ emissions and hydrothermal disturbances at the front of the Nepal Himalayas following the deadly 25 April 2015 Gorkha earthquake (moment magnitude M$_w$ = 7.8). The data show unambiguously the appearance, after the earthquake, sometimes with a delay of several months, of CO$_2$ emissions at several sites separated by > 10 kilometres, associated with persistent changes in hydrothermal discharges, including a complete cessation. These observations reveal that Himalayan hydrothermal systems are sensitive to co- and post- seismic deformation, leading to non-stationary release of metamorphic CO$_2$ from active orogens. Possible pre-seismic effects need further confirmation
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Dates and versions

cea-01880809 , version 1 (07-06-2019)

Licence

Attribution - CC BY 4.0

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Cite

Frédéric Girault, Lok Bijaya Adhikari, Christian France-Lanord, Pierre Agrinier, Bharat Koirala, et al.. Persistent CO$_2$ emissions and hydrothermal unrest following the 2015 earthquake in Nepal. Nature Communications, 2018, 9, pp.2956. ⟨10.1038/s41467-018-05138-z⟩. ⟨cea-01880809⟩
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