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Bulletin of Volcanology

, Volume 73, Issue 6, pp 679–697 | Cite as

The May 2005 eruption of Fernandina volcano, Galápagos: The first circumferential dike intrusion observed by GPS and InSAR

  • William W. ChadwickJr
  • Sigurjon Jónsson
  • Dennis J. Geist
  • Michael Poland
  • Daniel J. Johnson
  • Spencer Batt
  • Karen S. Harpp
  • Andres Ruiz
Research Article

Abstract

The May 2005 eruption of Fernandina volcano, Galápagos, occurred along circumferential fissures parallel to the caldera rim and fed lava flows down the steep southwestern slope of the volcano for several weeks. This was the first circumferential dike intrusion ever observed by both InSAR and GPS measurements and thus provides an opportunity to determine the subsurface geometry of these enigmatic structures that are common on Galápagos volcanoes but are rare elsewhere. Pre- and post- eruption ground deformation between 2002 and 2006 can be modeled by the inflation of two separate magma reservoirs beneath the caldera: a shallow sill at ~1 km depth and a deeper point-source at ~5 km depth, and we infer that this system also existed at the time of the 2005 eruption. The co-eruption deformation is dominated by uplift near the 2005 eruptive fissures, superimposed on a broad subsidence centered on the caldera. Modeling of the co-eruption deformation was performed by including various combinations of planar dislocations to simulate the 2005 circumferential dike intrusion. We found that a single planar dike could not match both the InSAR and GPS data. Our best-fit model includes three planar dikes connected along hinge lines to simulate a curved concave shell that is steeply dipping (~45–60°) toward the caldera at the surface and more gently dipping (~12–14°) at depth where it connects to the horizontal sub-caldera sill. The shallow sill is underlain by the deep point source. The geometry of this modeled magmatic system is consistent with the petrology of Fernandina lavas, which suggest that circumferential eruptions tap the shallowest parts of the system, whereas radial eruptions are fed from deeper levels. The recent history of eruptions at Fernandina is also consistent with the idea that circumferential and radial intrusions are sometimes in a stress-feedback relationship and alternate in time with one another.

Keywords

Circumferential dike intrusion Ground deformation Kinematic modeling Magma reservoirs 

Notes

Acknowledgments

The manuscript was greatly improved by helpful reviews from Sang-Ho Yun and Scott Rowland. This research was supported by grants from the National Science Foundation Earth Sciences Program (EAR-9814312, EAR-0004067, and EAR-0538205), and in part by the NOAA Vents Program (PMEL contribution #3559). Michael Ramsey (University of Pittsburg) and Scott Rowland (University of Hawaii) kindly assisted with acquiring and processing the ASTER satellite imagery. ENVISAT radar data were provided by the European Space Agency through Cat-1 project #3493. Clay Hamilton at upwarp.com created the illustration in Fig. 13. The Charles Darwin Research Station and the Galápagos National Park Service provided invaluable logistical assistance. Beth Bartel, Erika Rader, Glyn Williams-Jones, Nathalie Vigouroux, Terry Naumann, and Kim Whipple helped in the field during our 2002 and 2006 GPS surveys. This paper is dedicated to the memory of our late friend, colleague, and co-author Daniel J. Johnson.

Supplementary material

445_2010_433_MOESM1_ESM.pdf (25.7 mb)
ESM 1 (PDF 25.6 mb)

References

  1. Allan JF, Simkin T (2000) Fernandina Volcano’s evolved, well-mixed basalts: mineralogical and petrological contraints on the nature of the Galapagos plume. J Geophys Res 105(B3):6017–6041CrossRefGoogle Scholar
  2. Amelung F, Jónsson S, Zebker H, Segall P (2000) Widespread uplift and ‘trapdoor’ faulting on Galápagos volcanoes observed with radar interferometry. Nature 407:993–996CrossRefGoogle Scholar
  3. Anderson EM (1936) The dynamics of the formation of cone sheets, ring-dikes and cauldron subsidences. R Soc Edinb Proc 56:128–163Google Scholar
  4. Bagnardi M, Amelung F (2010) The shallow magmatic system of Fernandina Volcano, Galapagos Islands. Evidence of multiple magma reservoirs from Satellite Radar Interferometry. Eos Trans AGU 91(52), Fall Meet Suppl, Abstract G23C-0851Google Scholar
  5. Bagnardi M, Amelung F, Baker S (2009) Deformation associated with 1995, 2005 and 2009 eruptions at Fernandina Volcano, Galápagos, observed by Satellite Radar interferometry. Eos Trans AGU 90(52), Fall Meet Suppl, Abstract G43C-01Google Scholar
  6. Bailey EB, Maufe HB (1960) The geology of Ben Nevis and Glen Coe and the surrounding country. Memoir Geological Survey of Scotland 1–307Google Scholar
  7. Chadwick WW Jr, Dieterich JH (1995) Mechanical modeling of circumferential and radial diking on Galapagos volcanoes. J Volcanol Geotherm Res 66(1–4):37–52CrossRefGoogle Scholar
  8. Chadwick WW Jr, Howard KA (1991) The pattern of circumferential and radial eruptive fissures on the volcanoes of Fernandina and Isabela Islands, Galapagos. Bull Volcanol 53:259–275CrossRefGoogle Scholar
  9. Chadwick WW Jr, De Roy T, Carrasco A (1991) The September 1988 intra-caldera avalanche and eruption at Fernandina volcano, Galapagos Islands. Bull Volcanol 53:276–286CrossRefGoogle Scholar
  10. Chadwick WW Jr, Geist DJ, Jónsson S, Poland M, Johnson DJ, Meertens CM (2006) A volcano bursting at the seams: inflation, faulting, and eruption at Sierra Negra Volcano, Galápagos. Geology 34(12):1025–1028. doi: 10.1130/G22826A.1 CrossRefGoogle Scholar
  11. Dvorak JJ, Okamura AT (1987) A hydraulic model to explain variations in summit tilt rate at Kilauea and Mauna Loa volcanoes. In: Decker RW, Wright TL, Stauffer PH (eds) Volcanism in Hawaii. U. S. Geol Surv Prof Pap 1350:1281–1296Google Scholar
  12. Filson J, Simkin T, Leu LK (1973) Seismicity of a caldera collapse: Galapagos Islands 1968. J Geophys Res 78(35):8591–8622CrossRefGoogle Scholar
  13. Geist DJ, Naumann TR, Larson PL (1998) Evolution of Galápagos magmas: mantle and crustal fractionation without assimilation. J Petrol 39:953–971CrossRefGoogle Scholar
  14. Geist DJ, Chadwick WW Jr, Johnson DJ (2006a) Results from new GPS monitoring networks at Fernandina and Sierra Negra volcanoes, Galápagos, 2000–2002. J Volcanol Geotherm Res 150:79–97. doi: 10.1016/j.jvolgeores.2005.07.003 CrossRefGoogle Scholar
  15. Geist DJ, Fornari DJ, Kurz MD, Harpp KS, Soule SA, Perfit MR, Koleszar AM (2006b) Submarine Fernandina: magmatism at the leading edge of the Galápagos hot spot. Geochem Geophys Geosyst 7:Q12007. doi: 10.1029/2006GC001290 CrossRefGoogle Scholar
  16. Harpp KS, Fornari DJ, Geist DJ, Kurz MD (2003) Genovesa Submarine Ridge: a manifestation of plume-ridge interaction in the northern Galápagos Islands. Geochem Geophys Geosyst 4(9):8511. doi: 10.1029/2003GC000531 CrossRefGoogle Scholar
  17. Hugentobler U, Schaer S, Fridez P (2001) Bernese GPS Software Version 4.2. Astronomical Institute, University of Berne, Berne, p 515Google Scholar
  18. Johnson DM, P.R. H, Conrey RM (1999) XRF analysis of rocks and mineral for major and trace elements on a single low dilution Li-tetraborate fused bead. Adv X-Ray Anal 41:843–867Google Scholar
  19. Johnson SE, Schmidt KL, Tate MC (2002) Ring complexes in the Peninsular Range Batholith, Mexico and the USA: magma plumbing systems in the middle and upper crust. Lithos 61:187–208CrossRefGoogle Scholar
  20. Jónsson S (2009) Stress interaction between magma accumulation and trapdoor faulting on Sierra Negra Volcano, Galápagos. Tectonophysics 471(1–2):36–44. doi: 10.1016/j.tecto.2008.08.005 CrossRefGoogle Scholar
  21. Jónsson S, Zebker H, Cervelli P, Segall P, Garbeil H, Mouginis-Mark P, Rowland S (1999) A shallow-dipping dike fed the 1995 flank eruption at Fernandina Volcano, Galápagos, observed by satellite radar interferometry. Geophys Res Lett 26(8):1077–1080CrossRefGoogle Scholar
  22. Jónsson S, Zebker H, Segall P, Amelung F (2002) Fault slip distribution of the 1999 Mw7.1 Hector Mine Earthquake, California, estimated from satellite radar and GPS measurements. Bull Seismol Soc Am 92:1377–1389CrossRefGoogle Scholar
  23. Jónsson S, Zebker H, Amelung F (2005) On trapdoor faulting at Sierra Negra volcano, Galápagos. J Volcanol Geotherm Res 144:59–71. doi: 10.1016/j.jvolgeores.2004.11.029 CrossRefGoogle Scholar
  24. Lu Z, Wicks C Jr, Dzurisin D, Thatcher W, Freymueller JT, McNutt SR, Mann D (2000) Aseismic inflation of Westdahl volcano, Alaska, revealed by satellite radar interferometry. Geophys Res Lett 27(11):1567–1570CrossRefGoogle Scholar
  25. McBirney AR, Williams H (1969) Geology and petrology of the Galapagos Islands. Geol Soc Am Memoir 118:197Google Scholar
  26. Mogi K (1958) Relations between the eruptions of various volcanoes and the deformation of the ground surfaces around them. Bull Earthq Res Inst Univ Tokyo 36:99–134Google Scholar
  27. Nooner SL, Chadwick WW Jr (2009) Volcanic inflation measured in the caldera of Axial Seamount: implications for magma supply and future eruptions. Geochem Geophys Geosyst 10:Q02002. doi: 10.1029/2008GC002315 CrossRefGoogle Scholar
  28. Okada Y (1985) Surface deformation due to shear and tensile faults in a half-space. Bull Seismol Soc Am 75:1135–1154Google Scholar
  29. Okada Y (1992) Internal deformation due to shear and tensile faults in a half-space. Bull Seismol Soc Am 82:1018–1040Google Scholar
  30. Rowland SK (1996) Slopes, lava flow volumes, and vent distributions on Volcan Fernandina, Galapagos Islands. J Geophys Res 101(B12):27657–27672CrossRefGoogle Scholar
  31. Rowland SK, Harris AJL, Wooster MJ, Amelung F, Garbeil H, Wilson L, Mouginis-Mark PJ (2003) Volumetric characteristics of lava flows from interferometric radar and multispectral satellite data: the 1995 Fernandina and 1998 Cerro Azul eruptions in the western Galapagos. Bull Volcanol 65:311–330. doi: 10.1007/s00445-002-0262-x CrossRefGoogle Scholar
  32. Ruiz A, Geist D, Chadwick WW, Jr. (2007) Inflation of Sierra Negra volcano since the 2005 eruption. Eos Trans AGU 87(52), Fall Meet Suppl, Abstract V53C-1422Google Scholar
  33. Simkin T (1984) Geology of Galapagos Islands. In: Perry R (ed) Galapagos. Pergamon, Oxford, pp 15–41Google Scholar
  34. Simkin T, Howard KA (1970) Caldera collapse in the Galapagos Islands, 1968. Science 169:429–437CrossRefGoogle Scholar
  35. Simkin T, Siebert L (1994) Volcanoes of the world. Geoscience, TucsonGoogle Scholar
  36. Smithsonian Institution (1995–2009) Bulletin of the global volcanism network, Monthly reports for Fernandina volcano, http://www.volcano.si.edu/reports/bulletin/
  37. Sudhaus H, Jónsson S (2009) Improved source modeling through combined use of InSAR and GPS under consideration of correlated data errors: application to the June 2000 Kleifarvatn earthquake, Iceland. Geophys J Int 176:389–404CrossRefGoogle Scholar
  38. Walker GPL (1993) Re-evaluation of inclined sheets and dykes in the Cuillins volcano, Isle of Skye. In: Prichard HM, Alabaster T, Harris NBW, Neary CR (eds) Magmatic processes and plate tectonics. Geological Society of London, Geol Soc Spec Pub 76:3–38Google Scholar
  39. Yun S-H, Ji J, Zebker HA, Segall P (2005) On merging high- and low-resolution DEMs from TOPSAR and SRTM using a prediction-error filter. IEEE Trans Geosci Remote Sens 43(7):1682–1690CrossRefGoogle Scholar
  40. Yun S-H, Segall P, Zebker HA (2006) Constraints on magma chamber geometry at Sierra Negra Volcano, Galápagos Islands, based on InSAR observations. J Volcanol Geotherm Res 150:232–243. doi: 10.1016/j.jvolgeores.2005.07.009 CrossRefGoogle Scholar
  41. Zebker HA, Amelung F, Jonsson S (2000) Remote sensing of volcano surface and internal processes using radar interferometry. In: Mouginis-Mark PJ, Crisp JA, Fink JH (eds) Remote sensing of active volcanism. American Geophysical Union, Geophysical Monograph 116:179–206Google Scholar

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • William W. ChadwickJr
    • 1
  • Sigurjon Jónsson
    • 2
  • Dennis J. Geist
    • 3
  • Michael Poland
    • 4
  • Daniel J. Johnson
    • 5
  • Spencer Batt
    • 3
  • Karen S. Harpp
    • 6
  • Andres Ruiz
    • 7
  1. 1.Oregon State University/NOAAHatfield Marine Science CenterNewportUSA
  2. 2.KAUST - King Abdullah University of Science and TechnologyThuwalSaudi Arabia
  3. 3.Department of Geological SciencesUniversity of IdahoMoscowUSA
  4. 4.Hawaiian Volcano ObservatoryUSGSVolcanoUSA
  5. 5.Department of GeologyUniversity of Puget SoundTacomaUSA
  6. 6.Department of GeologyColgate UniversityHamiltonUSA
  7. 7.Instituto GeofísicoEscuela Politécnica NacionalQuitoEcuador

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