The largest effusive basaltic eruptions are associated with caldera collapse and are manifest through quasi-periodic ground displacements and moderate-size earthquakes1,2,3, but the mechanism that governs their dynamics remains unclear. Here we provide a physical model that explains these processes, which accounts for both the quasi-periodic stick–slip collapse of the caldera roof and the long-term eruptive behaviour of the volcano. We show that it is the caldera collapse itself that sustains large effusive eruptions, and that triggering caldera collapse requires topography-generated pressures. The model is consistent with data from the 2018 Kīlauea eruption and allows us to estimate the properties of the plumbing system of the volcano. The results reveal that two reservoirs were active during the eruption, and place constraints on their connectivity. According to the model, the Kīlauea eruption stopped after slightly more than 60 per cent of its potential caldera collapse events, possibly owing to the presence of the second reservoir. Finally, we show that this physical framework is generally applicable to the largest instrumented caldera collapse eruptions of the past fifty years.
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Tilt data are available in ref. 5 and Sentinel SAR data are available at https://sentinel.esa.int/web/sentinel/sentinel-data-access. Source data are provided with this paper.
The codes used in this work are available through Zenodo at https://zenodo.org/record/4500189#.YE_LI7RKiWg.
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We acknowledge I. Johanson and the Hawaiian Volcano Observatory for providing tiltmeters and GPS stations data. A.R. acknowledges support from the NASA Postdoctoral Program and the Universities Space Research Association, through a NASA-ASI (Italian Space Agency) agreement. We are grateful to M. Patrick and E. Rivalta for their constructive reviews, which helped to improve the clarity and completeness of the manuscript. Part of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration (grant 281945.02.47.05.24).
The authors declare no competing interests.
Peer review information Nature thanks Matthew Patrick and Eleonora Rivalta for their contribution to the peer review of this work. Peer reviewer reports are available.
Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Extended data figures and tables
a, North–south component of tilt recorded at UWD. This average signal was obtained by stacking 24-h periods of 19 collapses between 3 July and the end of the eruption. The shaded area corresponds to 2 s.d. of the stacking. The best fit of the function Aexp(ξ1t) + Bexp(ξ2t) − C is shown. The corresponding time constants ξ1 and ξ2 are 1.5 h and 8 d, respectively. b, Projection of the tilt of SDH along the radial direction to HLM (blue) and to SCR (green).
For clarity, only the additional parameters relevant to the two-chamber model are indicated. Parameters such as the geometrical properties or the position of the piston, which are the same for the one-chamber model, are not indicated (see Fig. 2). The properties of the shallow reservoir are marked with subscript s, whereas those of the deeper chamber with subscript d. For Kīlauea the shallow reservoir corresponds to the HLM source and the deep one corresponds to the SCR source. The properties of the conduit feeding the eruption are noted with subscript e, and those of the conduit connecting the two chambers with subscript c.
a, b, Linear LOS velocity maps (left) and time series (right) for a point (cross on the maps) in the area of maximum subsidence (green dots, blue curve) and the radial UWD tiltmeter (triangle on the maps) time series (black line) for Sentinel-1 descending track 87 (a) and ascending track 124 (b). Grey shading represents the time interval used in the InSAR source modelling.
Top, data, model and residuals for Sentinel-1 ascending (right) and descending (left) geometries. Bottom, PDFs of the source locations. The horizontal origin is set at the GNSS CRIM station.
Caldera and lava volume (DRE) as a function of collapse number. The relation between the two is given by equation (9). The orange dots correspond to the case in which only VHLM is used to calculate Ψ, whereas for the yellow dots we use VHLM + VSCR. The blue dot indicates the value of the final caldera volume as measured by GLISTIN-A, which is used as an inversion constraint, and the red dot indicates the current estimate of the total erupted volume, which was not included in the inversion dataset. Error bars (2 s.d.) correspond to the uncertainty in the prediction for the VHLM + VSCR case. Error bars for all other predictions are smaller than the marker size.
This video shows the variation of tilt measured by three stations during the collapse of the Kīlauea caldera. On the top the orange line indicates instantaneous tilt direction, whereas at the bottom the NS component of UWD and SDH station is shown. The locations of the two sources HLM and SCR inferred from InSAR are indicated by the red dots.
This video illustrates the characteristics of a model in which two reservoirs are connected in series. Instantaneous tilt direction and reservoirs locations are shown in map by the orange lines and the black dot respectively. The caldera is collapsing on the ‘northern’ reservoir, whereas the ‘southern’ reservoir is feeding the eruption. The color-scale indicates vertical elastic displacement, whereas the anelastic displacement due to slip of the piston block is not shown to avoid color saturation. On the bottom the temporal evolution of the tilt for the two stations is shown. The parameters used in this example are given in the Methods “Two reservoirs model” section.
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Roman, A., Lundgren, P. Dynamics of large effusive eruptions driven by caldera collapse. Nature 592, 392–396 (2021). https://doi.org/10.1038/s41586-021-03414-5