Phlegraean Fields 1982–1984: Brief chronicle of a volcano emergency in a densely populated area

Barberi, F.; Corrado, G.; Innocenti, Fabrizio; Luongo, Giuseppe

doi:10.1007/bf01961547

Cited by 203 publications

(104 citation statements)

References 11 publications

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“…1), which has produced voluminous eruptions over the last 22 000 years, the most recent one occurring in A.D. 186 (Wilson et al 1984). Recent periods of unrest in calderas at the Phlegraean Fields in Italy (Barberi et al 1984), Rabaul in Papua New Guinea (Mori et al 1989), and Yellowstone (Dzurisin & Yamashita 1987) and Long Valley (Savage & Cockerham 1984) in the United States have focused attention on this type of volcano. It is important to evaluate the long-term rates of deformation and seismicity at active calderas, as changes in either or both of these parameters may be precursory to volcanic activity.…”

Section: Introductionmentioning

confidence: 99%

Vertical deformation and shallow seismicity around Lake Taupo, New Zealand, 1985–90

Otway

Sherburn

1994

New Zealand Journal of Geology and Geophysics

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Vertical deformation and shallow seismicity around Lake Taupo, which occupies much of the Taupo Volcanic Centre, displayed two regionally distinct patterns during the 1985-90 study period. In the Taupo Fault Belt, north of the lake, there was aseismic sag. A high rate of relative subsidence of 10 ± 1 mm/yr resulted in inward tilt exceeding 1.0 ± 0.1 |μrad/yr, but was accompanied by almost no seismic activity. In contrast, the lakeshore and islands within the central and southern part of the lake displayed repeated small oscillations in height, superimposed on a pattern of slow tilt to the southwest, while the seismicity of this area was characterised by frequent small earthquake sequences. Four periods were identified when rates of deformation and seismicity within the southern area appeared to increase above previous levels, but there was no evidence of a one-to-one correspondence between deformation and individual seismic events. Both phenomena are thought more likely to reflect responses, at different time scales and depths, to the underlying strain release.

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Section: Introductionmentioning

confidence: 99%

Vertical deformation and shallow seismicity around Lake Taupo, New Zealand, 1985–90

Otway

Sherburn

1994

New Zealand Journal of Geology and Geophysics

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“…The occurrence of lowfrequency earthquakes or volcanic tremor during a particular sequence may identify it as volcanically significant. However, during recent periods of seismic unrest at the Phlegraean Fields in Italy (Barberi et al 1984) and Rabaul in Papua New Guinea (Mori et al 1989), these were not observed. The solution to adequate volcano-seismic surveillance is more than just long-term recording of earthquakes in areas of potential volcanism: we must be confident that we can recognise earthquake sequences that precede volcanic activity, and this may not be feasible in the Lake Taupo region.…”

Section: Discussionmentioning

confidence: 98%

Seismicity of the Lake Taupo region, New Zealand, 1985–90

Sherburn

1992

New Zealand Journal of Geology and Geophysics

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Earthquake activity in the Lake Taupo region during 1985-90 was dominated by the repeated occurrence of sequences of small earthquakes, and statistical analysis confirms that clustering was present. Earthquakes were concentrated beneath the central, eastern, and southern parts of the lake, with the Tokaanu, Motuoapa, and Te Hapua Bay areas being the main sites of repeated sequences. Western Bay, the western Taupo Fault Belt, and an area near the southwestern shore of the lake were almost aseismic. Almost all earthquakes occurred within the 15 km thick crust, with a concentration at 4 km depth. The distribution of earthquakes during 1985-90 contrasts with previous studies which snowed a concentration of seismicity in Western Bay and near the southwestern shore of the lake. The tendency for earthquakes to be concentrated in certain areas, together with large changes in the rate of activity, cause significant problems for the identification of earthquake sequences that may be precursors to volcanic activity.

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“…One of these episodes, totaling a maximum vertical displacement of 7 m, preceded the onset of the last eruption, at Monte Nuovo, in 1538 (Dvorak and Gasparini, 1991). Two other big events occurred recently, in 1969 and 1982, each one accompanied by seismic activity and leading to a vertical displacement of about 2 m (Casertano et al, 1976;Barberi et al, 1984). In this case, luckily, a renewal of eruptive activity did not follow.…”

Section: Introductionmentioning

confidence: 92%

“…Since 1985, a slow, aseismic subsidence has been observed, only interrupted by three very small uplift. Each event, since 1982 has been accompanied by notable changes in the composition of fumarolic gases (Cioni et al, 1984;Barberi et al, 1984;Tedesco and Scarsi, 1999). …”

Section: Introductionmentioning

confidence: 99%

05/00888 Modeling of recent volcanic episodes at Phlegrean Fields (Italy): geochemical variations and ground deformation

2005

Fuel and Energy Abstracts

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Phlegrean Fields is an active caldera structure, located at the periphery of Naples (Italy). After the last eruptive event (the Monte Nuovo eruption, in 1538), periodic episodes of unrest characterize the evolution of this volcanic district, involving seismic activity and slow ground motion (bradyseism). During unrest episodes, there have been significant changes in the composition of hydrothermal fluids discharged at La Solfatara fumarolic field. These unrest phenomena result from complex interaction between the magma chamber, hydrothermal fluid circulation, and country rocks undergoing thermal and mechanical stresses. Understanding the mechanism driving bradyseismic activity and unravelling the relation between ground deformation and hydrothermal fluid circulation are necessary steps toward developing an effective hazard assessment in a densely populated area such as Phlegrean Fields. In this work, we present some results of numerical modeling of both the hydrothermal fluid circulation at La Solfatara, and of its effects on rock deformation. Modeling results show that periods of intensified magmatic degassing explain many features of the recent unrest crises at Phlegrean Fields.

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Phlegraean Fields 1982–1984: Brief chronicle of a volcano emergency in a densely populated area

Abstract: The essential features of the ongoing potential pre-eruptive crisis at the Phlegraean Fields begun in August 1982 are summarized and the main problems faced by scientists responsible of volcanic hazards evaluation in such a densely populated area are discussed.

Cited by 203 publications

References 11 publications

Vertical deformation and shallow seismicity around Lake Taupo, New Zealand, 1985–90

Vertical deformation and shallow seismicity around Lake Taupo, New Zealand, 1985–90

Seismicity of the Lake Taupo region, New Zealand, 1985–90

05/00888 Modeling of recent volcanic episodes at Phlegrean Fields (Italy): geochemical variations and ground deformation

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