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<p>Hydrothermal fluid circulation in active volcanoes can significantly modify the porosity, permeability, and mechanical strength of rocks, reshaping heat and mass flow in volcanic edifices. La Soufrière de Guadeloupe, in the Eastern Caribbean, is an active volcano characterized by an extensive hydrothermal system. A period of unrest has been ongoing since 1992, which manifests at the surface as increasing fumarolic activity and high ground temperatures in a delimited region of the volcano summit. Here, we present a high-resolution, 3D electrical conductivity model of the volcano summit, obtained using electrical resistivity tomography data. It is the highest resolution near-surface electrical conductivity model of an active volcano summit to date. To interpret our conductivity model, we measured the electrical conductivity of rock samples from the volcano in the laboratory. The combined laboratory and field data suggest that the hydrothermal system has altered an important volume of the surveyed summit region (volume of approximately <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(2.2 \times 10^4 \text {m}^3 \text {, out of}~7.0 \times 10^5 \text {m}^3\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>2.2</mn> <mo>×</mo> <msup> <mn>10</mn> <mn>4</mn> </msup> <msup> <mtext>m</mtext> <mn>3</mn> </msup> <mtext>, out of</mtext> <mspace width="3.33333pt" /> <mn>7.0</mn> <mo>×</mo> <msup> <mn>10</mn> <mn>5</mn> </msup> <msup> <mtext>m</mtext> <mn>3</mn> </msup> </mrow> </math></EquationSource> </InlineEquation>). Furthermore, we infer the presence of several shallow pressurized gas pockets confined by low-permeability clay caps, located in the diffuse degassing zone of the summit, which is frequented by guided tours. Our findings help to assess risks, such as sudden explosions, ground subsidence and collapse, slope instability, and toxic gas emissions, especially in zones that are visited on a daily basis.</p>

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Geophysics-assisted imaging of shallow gas pockets and hydrothermal alteration at the summit of La Soufrière de Guadeloupe (Eastern Caribbean)

  • 期刊论文

  • 发表日期：

    2026年4月10日

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  • Aida Mendieta,
  • Marina Rosas-Carbajal,
  • David E. Jessop,
  • Jean-Christophe Komorowski,
  • Sébastien Deroussi,
  • Ivan Vlastelic,
  • Marlène Villeneuve,
  • Marie Violay,
  • Tomaso Esposti Ongaro,
  • Alexandra R. L. Kushnir,
  • François Beauducel,
  • Jean-Bernard de Chabalier,
  • Raphaël Bajou,
  • Patrick Baud,
  • Michael J. Heap

摘要

Hydrothermal fluid circulation in active volcanoes can significantly modify the porosity, permeability, and mechanical strength of rocks, reshaping heat and mass flow in volcanic edifices. La Soufrière de Guadeloupe, in the Eastern Caribbean, is an active volcano characterized by an extensive hydrothermal system. A period of unrest has been ongoing since 1992, which manifests at the surface as increasing fumarolic activity and high ground temperatures in a delimited region of the volcano summit. Here, we present a high-resolution, 3D electrical conductivity model of the volcano summit, obtained using electrical resistivity tomography data. It is the highest resolution near-surface electrical conductivity model of an active volcano summit to date. To interpret our conductivity model, we measured the electrical conductivity of rock samples from the volcano in the laboratory. The combined laboratory and field data suggest that the hydrothermal system has altered an important volume of the surveyed summit region (volume of approximately \(2.2 \times 10^4 \text {m}^3 \text {, out of}~7.0 \times 10^5 \text {m}^3\) 2.2 × 10 4 m 3 , out of 7.0 × 10 5 m 3 ). Furthermore, we infer the presence of several shallow pressurized gas pockets confined by low-permeability clay caps, located in the diffuse degassing zone of the summit, which is frequented by guided tours. Our findings help to assess risks, such as sudden explosions, ground subsidence and collapse, slope instability, and toxic gas emissions, especially in zones that are visited on a daily basis.