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April 2007 Collapse of Piton De La Fournaise: a New Example of Caldera Formation Laurent Michon, Thomas Staudacher, Valérie Ferrazzini, Patrick Bachèlery, Joan Marti

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April 2007 Collapse of Piton De La Fournaise: a New Example of Caldera Formation Laurent Michon, Thomas Staudacher, Valérie Ferrazzini, Patrick Bachèlery, Joan Marti April 2007 collapse of Piton de la Fournaise: A new example of caldera formation Laurent Michon, Thomas Staudacher, Valérie Ferrazzini, Patrick Bachèlery, Joan Marti To cite this version: Laurent Michon, Thomas Staudacher, Valérie Ferrazzini, Patrick Bachèlery, Joan Marti. April 2007 collapse of Piton de la Fournaise: A new example of caldera formation. Geophysical Research Letters, American Geophysical Union, 2007, 34 (21), pp.L21301. 10.1029/2007GL031248. hal-00311954 HAL Id: hal-00311954 https://hal.archives-ouvertes.fr/hal-00311954 Submitted on 30 Dec 2019 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. GEOPHYSICAL RESEARCH LETTERS, VOL. 34, L21301, doi:10.1029/2007GL031248, 2007 April 2007 collapse of Piton de la Fournaise: A new example of caldera formation Laurent Michon,1 Thomas Staudacher,2 Vale´rie Ferrazzini,2 Patrick Bache`lery,1 and Joan Marti3 Received 6 July 2007; revised 12 September 2007; accepted 5 October 2007; published 1 November 2007. [1] Collapse calderas are frequent in the evolution of 1970], and in 2000 at Miyakejima volcano [Geshi et al., volcanic systems, but very few have formed during 2002]. In both cases, caldera collapse was interpreted as the historical times. Piton de la Fournaise is one of the result of large lateral magma intrusions within the edifice or world’s most active basaltic shield volcanoes. The caldera the underlying crust. collapse, which occurred during the April 2007 lateral [3] At Piton de la Fournaise (PdF), the volcano’s summit eruption is one of the few large documented collapse events zone experienced several coalescent pit craters during the on this volcano. It helps to understand the mode and origin last centuries [Carter et al., 2007]. The April 2007 eruption of caldera collapses in basaltic volcanoes. Field led to the largest collapse of the summit zone and the most observations, GPS and seismic data show that the collapse recent example in basaltic setting. It developed contempo- occurred at an early stage of the eruption. The cyclic seismic raneously to one of the largest historical lateral eruptions on signal suggests a step by step collapse that directly Reunion, suggesting a very close link between magma influenced the lateral eruption rate. Likely, the caldera withdrawal and the summit collapse. This study summarizes results from the combined effect of (i) the progressive the April 2007 eruption in order to explain the origin, the collapse of the plumbing system above the magma chamber timing and the effects of the collapse. It brings new since 2000, and (ii) the large amount of magma withdrawal constrains on (1) the relationship between magma with- during the early stage of the eruption by both a significant drawal and the collapse and (2) the timing of the collapse intrusion within the edifice and an important emission rate. regarding recent recurrent eruptions. Citation: Michon, L., T. Staudacher, V. Ferrazzini, P. Bachelery, and J. Marti (2007), April 2007 collapse of Piton de la Fournaise: A 2. Geological Setting of Piton de la Fournaise new example of caldera formation, Geophys. Res. Lett., 34, 2.1. General View L21301, doi:10.1029/2007GL031248. [4] PdF is the active volcano of La Re´union Island (Figure 1). The eruptive centre is located in a large 8 km 1. Introduction across caldera, the Enclos Fouque´, where most of the [2] Caldera collapse structures are common on basaltic eruptions occur since 4.5 ky [Bache`lery, 1981]. The present to silicic volcanoes [e.g., Cole et al., 2005]. In basaltic day summit shows two collapsed structures named the setting, they are defined either as pit crater or caldera. Pit ‘‘Bory crater’’, which is currently inactive, and the ‘‘Dolo- craters, which correspond to small structures, tens to mieu crater’’, which is the locus of numerous summit hundreds of meters across, may have several origins. They eruptions. Carter et al. [2007] recently showed that the form along the rift zones by stopping over an underlying pre-2007 elongated geometry of Dolomieu results from large-aperture rift zone fracture [Okubo and Martel, 1998], recurrent pit crater collapses. and at the volcano’s summit by magma withdrawal in [5] The activity of PdF is characterized by fissure erup- shallow reservoirs [Hirn et al., 1991; Rymer et al., 1998; tions fed by a magma reservoir located at about sea level Longpre´etal., 2007]. Basaltic calderas are kilometric struc- [Fukushima et al., 2005; Peltier et al., 2007]. Considering tures usually formed during large lateral eruptions or intru- the location of the eruption site, three types of eruptions can sions, which affect the main magma chamber [MacDonald, be distinguished. 1- Summit eruptions start and remain in 1965; MacPhie et al., 1990; Kumagai et al., 2001; Kaneko et Dolomieu. 2- Proximal eruptions, which may start in the al., 2005]. Two of the most recent caldera collapses on summit but progress to the flanks of the central cone and basaltic or intermediate volcanoes occurred in 1968 in usually propagate downslope to the Enclos caldera floor. Fernandina Island, Western Galapagos [Simkin and Howard, 3- Distal eruptions develop away from the central cone, starting in the Enclos caldera floor. During the last century, the distal eruptions were in some cases associated with the development of summit collapses [Bache`lery, 1981; Carter 1Laboratoire Ge´oSciences Re´union, Institut de Physique du Globe de Paris, Universite´deLaRe´union, CNRS, UMR 7154-Ge´ologie des et al., 2007]. Among them, the most voluminous eruption of 3 Syste`mes Volcaniques, La Re´union, France. 1931 with 130 Mm was related to a large collapse 2Observatoire Volcanologique du Piton de la Fournaise, Institut de corresponding to the eastern half of Dolomieu [Lacroix, Physique du Globe de Paris, CNRS, UMR 7154-Ge´ologie des Syste`mes 1938, Figure 1]. The lack of any continuous observation and Volcaniques, La Re´union, France. 3Institute of Earth Sciences ‘‘Jaume Almera,’’ Consejo Superior de monitoring during the largest events does not allow the Investigaciones Cientı´ficas, Barcelona, Spain. determination of the precise relationship between these eruptions and the associated summit collapses. Copyright 2007 by the American Geophysical Union. 0094-8276/07/2007GL031248 L21301 1of6 L21301 MICHON ET AL.: A NEW EXAMPLE OF CALDERA COLLAPSE L21301 Figure 1. Location of Piton de la Fournaise volcano. The central cone is cut by two collapsed craters, Bory and Dolomieu. 1 and 2 represent the location of eruptive fissures during the first and second eruptive phases, respectively. Bor and Tkr correspond to the seismic stations used in Figure 3. NERZ and SERZ: NE and SE rift zones. 2.2. Summary of the March 1998–February 2007 tremor [Battaglia et al., 2005]. Volcano-tectonic (VT) Evolution events seldom occurred during the eruptive phases [6] Since 1998, PdF has been characterized by an (Figure 2). The eruption evolution progressively changed intense eruptive activity with 2–4 eruptions per year. Most with an increase of both tremor amplitude and seismicity of the eruptions correspond to summit and proximal before a rapid end of the eruption [Longpre´etal., 2007]. events. Some of them, the summit eruptions, contributed Since 2000, the seismicity was especially abundant during to the progressive filling of Dolomieu by the accumulation voluminous eruptions, most of them being distal. During the of pahoehoe lava flows. Total filling of Dolomieu was November 2002 eruption, the seismicity intensified 5 days attained with the August 2006–January 2007 summit before the end of the eruption and continued at shallower eruption during which a pile of 20–30 m of lava flows levels before the collapse of a small pit crater on December accumulated on the crater floor. Five distal eruptions 23 in Dolomieu [Longpre´etal., 2007]. Such a surface occurred during the 1998–2007 period. They were mainly phenomena did not occur during the other distal eruptions concentrated in the Plaine des Osmondes depression, along despite a strong increase of the VT seismicity in both the NE rift zones (Figure 1). frequency and magnitude below the summit. However, the [7] Before 2000, the eruptions of PdF were showing a coeval intensification of the emission rate and the VT events similar evolution with a progressive disappearance of the 2of6 L21301 MICHON ET AL.: A NEW EXAMPLE OF CALDERA COLLAPSE L21301 Figure 2. Volcano-tectonic seismicity between 1988 and March 2007. Note the onset of the co-eruptive seismicity since 2000. suggests that the overlying rock column beneath Dolomieu intensification of both the seismicity and the tremor was experienced recurrent destabilizations. coeval with a collapse of Dolomieu (Figure 4b). The tremor progressively went down to its initial level, i.e., before the 3. April 2007 Eruption paroxysmal phase, whereas the cyclic seismic signal remained until the 7th of April 01:00. The eruption contin- 3.1. Development of the Eruption ued until the 1st of May with a fluctuating tremor. The total [8] On February 26 the seismic activity began below the volume of magma emitted during the eruption is hard to summit zone. It progressively increased and reached the assess since a large amount of lava flowed down to the sea value of more than 100 daily events on March 28 to 30. A where it formed a large platform. However, given the seismic crisis started on March 30 at 16:25 UTM and the topography and the bathymetry before the event, a volume magma emission begun at 18:50 from an eruptive fissure of 100–140 Â 106 m3 has been inferred.
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