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Journal articles on the topic 'Rabaul Caldera'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Wood, C. P., I. A. Nairn, C. O. Mckee, and B. Talai. "Petrology of the Rabaul Caldera area, Papua New Guinea." Journal of Volcanology and Geothermal Research 69, no. 3-4 (December 1995): 285–302. http://dx.doi.org/10.1016/0377-0273(95)00034-8.

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2

Mori, J., C. McKee, I. Itikarai, P. de Saint Ours, and B. Talai. "Sea level measurements for inferring ground deformations in Rabaul Caldera." Geo-Marine Letters 6, no. 4 (December 1986): 241–46. http://dx.doi.org/10.1007/bf02239586.

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3

Ronchin, Erika, Timothy Masterlark, John Dawson, Steve Saunders, and Joan Martì Molist. "Imaging the complex geometry of a magma reservoir using FEM-based linear inverse modeling of InSAR data: application to Rabaul Caldera, Papua New Guinea." Geophysical Journal International 209, no. 3 (March 24, 2017): 1746–60. http://dx.doi.org/10.1093/gji/ggx119.

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Summary We test an innovative inversion scheme using Green's functions from an array of pressure sources embedded in finite-element method (FEM) models to image, without assuming an a-priori geometry, the composite and complex shape of a volcano deformation source. We invert interferometric synthetic aperture radar (InSAR) data to estimate the pressurization and shape of the magma reservoir of Rabaul caldera, Papua New Guinea. The results image the extended shallow magmatic system responsible for a broad and long-term subsidence of the caldera between 2007 February and 2010 December. Elastic FEM solutions are integrated into the regularized linear inversion of InSAR data of volcano surface displacements in order to obtain a 3-D image of the source of deformation. The Green's function matrix is constructed from a library of forward line-of-sight displacement solutions for a grid of cubic elementary deformation sources. Each source is sequentially generated by removing the corresponding cubic elements from a common meshed domain and simulating the injection of a fluid mass flux into the cavity, which results in a pressurization and volumetric change of the fluid-filled cavity. The use of a single mesh for the generation of all FEM models avoids the computationally expensive process of non-linear inversion and remeshing a variable geometry domain. Without assuming an a-priori source geometry other than the configuration of the 3-D grid that generates the library of Green's functions, the geodetic data dictate the geometry of the magma reservoir as a 3-D distribution of pressure (or flux of magma) within the source array. The inversion of InSAR data of Rabaul caldera shows a distribution of interconnected sources forming an amorphous, shallow magmatic system elongated under two opposite sides of the caldera. The marginal areas at the sides of the imaged magmatic system are the possible feeding reservoirs of the ongoing Tavurvur volcano eruption of andesitic products on the east side and of the past Vulcan volcano eruptions of more evolved materials on the west side. The interconnection and spatial distributions of sources correspond to the petrography of the volcanic products described in the literature and to the dynamics of the single and twin eruptions that characterize the caldera. The ability to image the complex geometry of deformation sources in both space and time can improve our ability to monitor active volcanoes, widen our understanding of the dynamics of active volcanic systems and improve the predictions of eruptions.

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4

Roggensack, K., S. N. Williams, S. J. Schaefer, and R. A. Parnell. "Volatiles from the 1994 Eruptions of Rabaul: Understanding Large Caldera Systems." Science 273, no. 5274 (July 26, 1996): 490–93. http://dx.doi.org/10.1126/science.273.5274.490.

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5

Cunningham, H. S., S. P. Turner, A. Dosseto, and S. Eggins. "Timescales of petrogenesis in an active caldera, Rabaul, Papua New Guinea." Geochimica et Cosmochimica Acta 70, no. 18 (August 2006): A122. http://dx.doi.org/10.1016/j.gca.2006.06.157.

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6

Finlayson, D. M., O. Gudmundsson, I. Itikarai, Y. Nishimura, and H. Shimamura. "Rabaul volcano, Papua New Guinea: seismic tomographic imaging of an active caldera." Journal of Volcanology and Geothermal Research 124, no. 3-4 (June 2003): 153–71. http://dx.doi.org/10.1016/s0377-0273(02)00472-9.

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7

Fabbro, Gareth N., Chris O. McKee, Mikhail E. Sindang, Stephen Eggins, and Caroline Bouvet de Maisonneuve. "Variable mafic recharge across a caldera cycle at Rabaul, Papua New Guinea." Journal of Volcanology and Geothermal Research 393 (March 2020): 106810. http://dx.doi.org/10.1016/j.jvolgeores.2020.106810.

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8

Cunningham, H. S., S. P. Turner, H. Patia, R. Wysoczanski, A. R. L. Nichols, S. Eggins, and A. Dosseto. "(210Pb/226Ra) variations during the 1994–2001 intracaldera volcanism at Rabaul Caldera." Journal of Volcanology and Geothermal Research 184, no. 3-4 (July 2009): 416–26. http://dx.doi.org/10.1016/j.jvolgeores.2009.04.018.

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9

Saunders, Steve J. "The shallow plumbing system of Rabaul caldera: a partially intruded ring fault?" Bulletin of Volcanology 63, no. 6 (October 2001): 406–20. http://dx.doi.org/10.1007/s004450100159.

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10

Mckee, C. O., R. W. Johnson, P. L. Lowenstein, S. J. Riley, R. J. Blong, P. De Saint Ours, and B. Talai. "Rabaul Caldera, Papua New Guinea: Volcanic hazards, surveillance, and eruption contingency planning." Journal of Volcanology and Geothermal Research 23, no. 3-4 (February 1985): 195–237. http://dx.doi.org/10.1016/0377-0273(85)90035-6.

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11

Greene, H. Gary, Donald L. Tiffin, and Chris O. McKee. "Structural deformation and sedimentation in an active Caldera, Rabaul, Papua New Guinea." Journal of Volcanology and Geothermal Research 30, no. 3-4 (December 1986): 327–56. http://dx.doi.org/10.1016/0377-0273(86)90060-0.

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12

Nairn, I. A., C. O. Mckee, B. Talai, and C. P. Wood. "Geology and eruptive history of the Rabaul Caldera area, Papua New Guinea." Journal of Volcanology and Geothermal Research 69, no. 3-4 (December 1995): 255–84. http://dx.doi.org/10.1016/0377-0273(95)00035-6.

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13

MORI, J., and C. MCKEE. "Outward-Dipping Ring-Fault Structure at Rabaul Caldera as Shown by Earthquake Locations." Science 235, no. 4785 (January 9, 1987): 193–95. http://dx.doi.org/10.1126/science.235.4785.193.

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14

Cunningham, H. S., S. P. Turner, A. Dosseto, H. Patia, S. M. Eggins, and R. J. Arculus. "Temporal Variations in U-series Disequilibria in an Active Caldera, Rabaul, Papua New Guinea." Journal of Petrology 50, no. 3 (February 19, 2009): 507–29. http://dx.doi.org/10.1093/petrology/egp009.

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15

Obzhirov, A. I. "Chemistry of free and dissolved gases of Matupit Bay, Rabaul caldera, Papua New Guinea." Geo-Marine Letters 12, no. 1 (March 1992): 54–59. http://dx.doi.org/10.1007/bf02092109.

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16

De Natale, G., C. Troise, F. Pingue, and A. Zollo. "Earthquake dynamics during unrest episodes at Campi Flegrei Caldera (Italy): A comparison with Rabaul (New Guinea)." Physics and Chemistry of the Earth, Part A: Solid Earth and Geodesy 24, no. 2 (January 1999): 97–100. http://dx.doi.org/10.1016/s1464-1895(99)00002-2.

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17

Geyer, A., and J. Gottsmann. "The influence of mechanical stiffness on caldera deformation and implications for the 1971–1984 Rabaul uplift (Papua New Guinea)." Tectonophysics 483, no. 3-4 (March 2010): 399–412. http://dx.doi.org/10.1016/j.tecto.2009.10.029.

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18

Bouvet de Maisonneuve, C., F. Costa, H. Patia, and C. Huber. "Mafic magma replenishment, unrest and eruption in a caldera setting: insights from the 2006 eruption of Rabaul (Papua New Guinea)." Geological Society, London, Special Publications 422, no. 1 (2015): 17–39. http://dx.doi.org/10.1144/sp422.2.

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19

Tarasov, V. G., A. V. Gebruk, V. M. Shulkin, G. M. Kamenev, V. I. Fadeev, V. N. Kosmynin, V. V. Malakhov, D. A. Starynin, and A. I. Obzhirov. "Effect of shallow-water hydrothermal venting on the biota of Matupi Harbour (Rabaul Caldera, New Britain Island, Papua New Guinea)." Continental Shelf Research 19, no. 1 (January 1999): 79–116. http://dx.doi.org/10.1016/s0278-4343(98)00073-9.

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20

Ronchin, Erika, Timothy Masterlark, Joan Martí Molist, Steve Saunders, and Wei Tao. "Solid modeling techniques to build 3D finite element models of volcanic systems: An example from the Rabaul Caldera system, Papua New Guinea." Computers & Geosciences 52 (March 2013): 325–33. http://dx.doi.org/10.1016/j.cageo.2012.09.025.

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21

Troise, Claudia, Giuseppe De Natale, Folco Pingue, and Aldo Zollo. "A model for earthquake generation during unrest episodes at Campi Flegrei and Rabaul Calderas." Geophysical Research Letters 24, no. 13 (July 1, 1997): 1575–78. http://dx.doi.org/10.1029/97gl01477.

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22

Robertson, Robert M., and Christopher R. J. Kilburn. "Deformation regime and long-term precursors to eruption at large calderas: Rabaul, Papua New Guinea." Earth and Planetary Science Letters 438 (March 2016): 86–94. http://dx.doi.org/10.1016/j.epsl.2016.01.003.

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23

Bernard, Olivier, Weiran Li, Fidel Costa, Steve Saunders, Ima Itikarai, Mikhail Sindang, and Caroline Bouvet de Maisonneuve. "Explosive-effusive-explosive: The role of magma ascent rates and paths in modulating caldera eruptions." Geology, May 27, 2022. http://dx.doi.org/10.1130/g50023.1.

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One of the biggest challenges in volcanology is assessing the role of magma properties (volatile budgets, storage depths, and ascent rates) in controlling eruption explosivity. We use a new approach based on apatite to estimate volatile contents and magma ascent rates from a sequence of sub-Plinian, effusive, and Vulcanian eruption deposits at Rabaul caldera (Papua New Guinea) emplaced in 2006 CE to probe the mechanisms responsible for the sudden transitions in eruption styles. Our findings show that all magmas were originally stored at similar conditions (2–4 km depth and 1.8–2.5 wt% H2O in the melt); only the magma that formed the lava flow stalled and degassed at a shallower level (0.2–1.5 km) for several months. A more energetic batch of magma rose from depth, bypassed the transient reservoir, and ascended within ≤8 h to Earth’s surface (mean velocity ≥0.2 m/s), yielding the initial sub-Plinian phase of the eruption. The shallowly degassed magma was then able to reach the surface as a lava flow, likely through the path opened by the sub-Plinian magma. The magma of the last Vulcanian phase ascended without storage at a shallow depth, albeit more slowly (ascent rate 0.03–0.1 m/s) than the sub-Plinian magma. Our study illustrates how the complexity of plumbing systems may affect eruption styles, including at other volcanic systems, and have implications for interpreting volcano monitoring data.

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24

McKee, Chris O., and Gareth N. Fabbro. "The Talili Pyroclastics eruption sequence: VEI 5 precursor to the seventh century CE caldera-forming event at Rabaul, Papua New Guinea." Bulletin of Volcanology 80, no. 11 (October 27, 2018). http://dx.doi.org/10.1007/s00445-018-1255-8.

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25

Garthwaite, Matthew C., Victoria L. Miller, Steve Saunders, Michelle M. Parks, Guorong Hu, and Amy L. Parker. "A Simplified Approach to Operational InSAR Monitoring of Volcano Deformation in Low- and Middle-Income Countries: Case Study of Rabaul Caldera, Papua New Guinea." Frontiers in Earth Science 6 (January 24, 2019). http://dx.doi.org/10.3389/feart.2018.00240.

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26

Rodríguez-Molina, Sara, Pablo J. González, María Charco, Ana M. Negredo, and David A. Schmidt. "Time-Scales of Inter-Eruptive Volcano Uplift Signals: Three Sisters Volcanic Center, Oregon (United States)." Frontiers in Earth Science 8 (January 21, 2021). http://dx.doi.org/10.3389/feart.2020.577588.

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A classical inflation-eruption-deflation cycle of a volcano is useful to conceptualize the time-evolving deformation of volcanic systems. Such a model predicts accelerated uplift during pre-eruptive periods, followed by subsidence during the co-eruptive stage. Some volcanoes show puzzling persistent uplift signals with minor or no other geophysical or geochemical variations, which are difficult to interpret. Such temporal behaviors are usually observed in large calderas (e.g., Yellowstone, Long Valley, Campi Flegrei, Rabaul), but less commonly for stratovolcanoes. Volcano deformation needs to be better understood during inter-eruptive stages, to assess its value as a tool for forecasting eruptions and to understand the processes governing the unrest behavior. Here, we analyze inter-eruptive uplift signals at Three Sisters, a complex stratovolcano in Oregon (United States), which in recent decades shows persistent inter-eruptive uplift signals without associated eruptive activity. Using a Bayesian inversion method, we re-assessed the source characteristics (magmatic system geometry and location) and its uncertainties. Furthermore, we evaluate the most recent evolution of the surface deformation signals combining both GPS and InSAR data through a new non-subjective linear regularization inversion procedure to estimate the 26 years-long time-series. Our results constrain the onset of the Three Sisters volcano inflation to be between October 1998 and August 1999. In the absence of new magmatic inputs, we estimate a continuous uplift signal, at diminishing but detectable rates, to last for few decades. The observed uplift decay observed at Three Sisters is consistent with a viscoelastic response of the crust, with viscosity of ∼1018 Pa s around a magmatic source with a pressure change which increases in finite time to a constant value. Finally, we compare Three Sisters volcano time series with historical uplift at different volcanic systems. Proper modeling of scaled inflation time series indicates a unique and well-defined exponential decay in temporal behavior. Such evidence supports that this common temporal evolution of uplift rates could be a potential indicator of a rather reduced set of physical processes behind inter-eruptive uplift signals.

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