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Caldera structure, amount of collapse, and erupted volumes: The case of Bolsena caldera, Italy

2012; Geological Society of America; Volume: 124; Issue: 9-10 Linguagem: Inglês

10.1130/b30662.1

1943-2674

Valerio Acocella, Danilo M. Palladino, Raffaello Cioni, Paola Russo, S. Simei,

Seismic Waves and Analysis

Research Article| September 01, 2012 Caldera structure, amount of collapse, and erupted volumes: The case of Bolsena caldera, Italy V. Acocella; V. Acocella † 1Dipartimento di Scienze Geologiche, Università Roma Tre, Largo San Leonardo Murialdo, 1, 00146 Roma, Italy †E-mail: acocella@uniroma3.it Search for other works by this author on: GSW Google Scholar D.M. Palladino; D.M. Palladino 2Dipartimento di Scienze della Terra, Università La Sapienza, Roma, Piazzale Aldo Moro, 5, 00185 Roma, Italy Search for other works by this author on: GSW Google Scholar R. Cioni; R. Cioni 3Dipartimento di Scienze della Terra, Università di Cagliari, Via Trentino, 51, 09127 Cagliari, Italy Search for other works by this author on: GSW Google Scholar P. Russo; P. Russo 2Dipartimento di Scienze della Terra, Università La Sapienza, Roma, Piazzale Aldo Moro, 5, 00185 Roma, Italy Search for other works by this author on: GSW Google Scholar S. Simei S. Simei 2Dipartimento di Scienze della Terra, Università La Sapienza, Roma, Piazzale Aldo Moro, 5, 00185 Roma, Italy Search for other works by this author on: GSW Google Scholar GSA Bulletin (2012) 124 (9-10): 1562–1576. https://doi.org/10.1130/B30662.1 Article history received: 22 Dec 2011 rev-recd: 08 Mar 2012 accepted: 11 Mar 2012 first online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation V. Acocella, D.M. Palladino, R. Cioni, P. Russo, S. Simei; Caldera structure, amount of collapse, and erupted volumes: The case of Bolsena caldera, Italy. GSA Bulletin 2012;; 124 (9-10): 1562–1576. doi: https://doi.org/10.1130/B30662.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Calderas are common on volcanoes, but their structure is seldom visible. The 19-km-wide Bolsena caldera, Italy, formed between 0.6 and 0.2 Ma. The largely preserved structural rim and subsurface data make Bolsena ideal to investigate caldera structure in relation to the subsidence and erupted volume. In this paper, we use remote sensing, field analysis, and available subsurface data. At the surface, the caldera passes from a downsag (south rim) to a narrow and densely faulted area (north rim), with outer normal and inner reverse faults. The caldera structure on the widely faulted east rim appears to be scale dependent, with a staircase-like fault zone (larger scale), horst-and-graben–like structures (intermediate scale), and domino-like structures (smaller scale). Subsurface data indicate asymmetric collapse, with a northward increase in subsidence, ranging from diffuse (to the south) to focused (to the north) deformation at the surface. The collapse rate, constant between ca. 490 and 175 ka, was more than magma output between ca. 330 and 130 ka, highlighting significant (∼200 m) and prolonged (∼200 ka) posteruptive subsidence. As the nearby Latera caldera (west rim of Bolsena) was mostly active between ca. 265 and 160 ka, much of the subsidence at Bolsena may be related to this activity, suggesting a common magmatic reservoir. The subsidence-related structural variations along the caldera rim and the significant posteruptive subsidence found at Bolsena have not been found in other calderas. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.