3D electrical conductivity tomography of volcanoes

被引:45
|
作者
Ahmed, A. Soueid [1 ,2 ]
Revil, A. [1 ,2 ]
Byrdina, S. [1 ,2 ]
Coperey, A. [1 ,2 ]
Gailler, L. [3 ]
Grobbe, N. [4 ,5 ]
Viveiros, F. [6 ]
Silva, C. [6 ,7 ]
Jougnot, D. [8 ]
Ghorbani, A. [9 ]
Hogg, C. [10 ]
Kiyan, D. [10 ]
Rath, V. [10 ]
Heap, M. J. [11 ]
Grandis, H. [12 ]
Humaida, H. [13 ]
机构
[1] Univ Grenoble Alpes, CNRS, IRD, IFSTTAR,ISTerre, Grenoble, France
[2] Univ Savoie Mt Blanc, ISTerre, Chambery, France
[3] Univ Blaise Pascal Clermont Ferrand II, Clermont Ferrand, France
[4] Univ Hawaii Manoa, Sch Ocean & Earth Sci & Technol, Hawaii Inst Geophys & Planetol, Honolulu, HI 96822 USA
[5] Univ Hawaii Manoa, Water Resources Res Ctr, Honolulu, HI 96822 USA
[6] Univ Acores, Inst Invest Vulcanol & Avaliacao Riscos, Ponta Delgada, Portugal
[7] Ctr Informacao & Vigilancia Sismovulcan Acores, Ponta Delgada, Portugal
[8] UPMC Univ Paris 06, Sorbonne Univ, CNRS, EPHE,METIS,UMR 7619, Paris, France
[9] Yazd Univ, Dept Min & Met Engn, Yazd, Iran
[10] Dublin Inst Adv Studies, Sch Cosm Phys, Geophys Sect, 5 Merr Sq, Dublin 2, Ireland
[11] Univ Strasbourg, CNRS, Inst Phys Globe Strasbourg, Geophys Expt,EOST,UMR 7516, Strasbourg, France
[12] ITB, Fac Min & Petr Engn, Appl & Explorat Geophys Grp, Bandung, Indonesia
[13] Geol Agcy Indonesia, Ctr Volcanol & Geol Hazard Mitigat, Bandung, Indonesia
基金
美国国家科学基金会;
关键词
YELLOWSTONE-NATIONAL-PARK; KILAUEA-VOLCANO; SAO-MIGUEL; RESISTIVITY TOMOGRAPHY; INDUCED-POLARIZATION; COMPLEX CONDUCTIVITY; HYDROTHERMAL SYSTEM; GUADELOUPE-VOLCANO; FIELD EXPERIMENTS; TRANSITION ZONE;
D O I
10.1016/j.jvolgeores.2018.03.017
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Electrical conductivity tomography is a well-established galvanometric method for imaging the subsurface electrical conductivity distribution. We characterize the conductivity distribution of a set of volcanic structures that are different in terms of activity and morphology. For that purpose, we developed a large-scale inversion code named ECT-3D aimed at handling complex topographical effects like those encountered in volcanic areas. In addition, ECT-3D offers the possibility of using as input data the two components of the electrical field recorded at independent stations. Without prior information, a Gauss-Newton method with roughness constraints is used to solve the inverse problem. The roughening operator used to impose constraints is computed on unstructured tetrahedral elements to map complex geometries. We first benchmark ECT-3D on two synthetic tests. A first test using the topography of Mt. St Helens volcano (Washington, USA) demonstrates that we can successfully reconstruct the electrical conductivity field of an edifice marked by a strong topography and strong variations in the resistivity distribution. A second case study is used to demonstrate the versatility of the code in using the two components of the electrical field recorded on independent stations along the ground surface. Then, we apply our code to real data sets recorded at (i) a thermally active area of Yellowstone caldera (Wyoming, USA), (ii) a monogenetic dome on Fumas volcano (the Azores, Portugal), and (iii) the upper portion of the caldera of Kilauea (Hawaii, USA). The tomographies reveal some of the major structures of these volcanoes as well as identifying alteration associated with high surface conductivities. We also review the petrophysics underlying the interpretation of the electrical conductivity of fresh and altered volcanic rocks and molten rocks to show that electrical conductivity tomography cannot be used as a stand-alone technique due to the non-uniqueness in interpreting electrical conductivity tomograms. That said, new experimental data provide evidence regarding the strong role of alteration in the vicinity of preferential fluid flow paths including magmatic conduits and hydrothermal vents. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码:243 / 263
页数:21
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