Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/1175
DC Field | Value | Language |
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dc.contributor.authorall | Kueppers, U.; University of Munich (LMU) | en |
dc.contributor.authorall | Scheu, B.; University of Munich (LMU) | en |
dc.contributor.authorall | Spieler, O.; University of Munich (LMU) | en |
dc.contributor.authorall | Dingwell, D. B.; University of Munich (LMU) | en |
dc.date.accessioned | 2006-06-17T19:01:31Z | en |
dc.date.available | 2006-06-17T19:01:31Z | en |
dc.date.issued | 2005-03-01 | en |
dc.identifier.uri | http://hdl.handle.net/2122/1175 | en |
dc.description.abstract | For an improvement in the quality of conduit flow and dome-related explosive eruption models, knowledge of the preeruption or precollapse density of the rocks involved is necessary. As close investigation is impossible during eruption, the best substitute comes from quantitative investigation of the eruption deposits. The porosity of volcanic rocks is of primary importance for the eruptive behaviour and, accordingly, a key-parameter for realistic models of dome stability and conduit flow. Fortunately, this physical property may be accurately determined via density measurements. We developed a robust, battery-powered device for rapid and reliable density measurements of dry rock samples in the field. The density of the samples (sealed in plastic bags at 250 mbar) is determined using the Archimedean principle. We have tested the device on the deposits of the 1990–1995 eruption of Unzen volcano, Japan. Short setup and operation times allow up to 60 measurements per day under fieldwork conditions. The rapid accumulation of correspondingly large data sets has allowed us to acquire the first statistically significant data set of clast density distribution in block-and-ash flow deposits. More than 1100 samples with a total weight of 2.2 tons were measured. The data set demonstrates that the deposits of the last eruptive episode at Unzen display a bimodal density distribution, with peaks at 2.0F0.1 and 2.3F0.1 g/cm3, corresponding to open porosity values of 20 and 8 vol.%, respectively. We use this data set to link the results of laboratory-based fragmentation experiments to field studies at recently active lava domes. | en |
dc.format.extent | 710471 bytes | en |
dc.format.mimetype | application/pdf | en |
dc.language.iso | English | en |
dc.publisher.name | Elsevier | en |
dc.relation.ispartof | Journal of Volcanology and Geothermal Research | en |
dc.relation.ispartofseries | 141 (2005) | en |
dc.subject | field-based density measurements | en |
dc.subject | dome | en |
dc.subject | Unzen volcano | en |
dc.subject | explosive eruption | en |
dc.subject | block-and-ash flow | en |
dc.subject | fragmentation behaviour | en |
dc.subject | volcanology | en |
dc.title | Field-based density measurements as tool to identify preeruption dome structure: set-up and first results from Unzen volcano, Japan | en |
dc.type | article | en |
dc.description.status | Published | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.description.pagenumber | 65-75 | en |
dc.subject.INGV | 04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques | en |
dc.identifier.doi | 10.1016/j.jvolgeores.2004.09.005 | en |
dc.relation.references | Belikov, B.P., Zalesskii, B.V., Rozanov, Y.A., Sanina, E.A., Timchenko, I.P., 1964. Methods of studying the physicomechanical properties of rocks. In: Zalesskii, B.V. (Ed.), Physical and Mechanical Properties of Rocks. Izdatel’stvo Nauka, Moscow, pp. 1– 58. Botcharnikov, R., Holtz, F., Behrens, H., Sato, H., 2003. Phase equilibrium study and constraints on pre-eruptive conditions of Unzen magmas. Abstract in Abstract Volume of IODP-ICDP Meeting 2003, Mainz, Germany. Cas, R.A.F., Wright, J.V., 1987. Volcanic Successions: Modern and Ancient. Chapman & Hall, London, pp. 476– 478. Dingwell, D.B., 1998. Recent experimental progress in the physical description of silicic magma relevant to explosive volcanism. In: Gilbert, J.S., Sparks, R.S.J. (Eds.), The Physics of Explosive Volcanic Eruptions. Spec. Publ. Geol. Soc. London, 145, 9 –26. Gardner, J.E., Thomas, R.M.E., Jaupart, C., Tait, S., 1996. Fragmentation of magma during plinian volcanic eruptions. Bull. Volcanol. 58, 144– 162. Hoblitt, R.P., Harmon, R.S., 1993. Bimodal density distribution of cryptodome dacite from the 1980 Mount St. Helens, Washington. Bull. Volcanol. 55, 421– 437. Houghton, B.F., Wilson, C.J.N., 1989. A vesicularity index for pyroclastic deposits. Bull. Volcanol. 51, 451– 462. Kueppers, U., Scheu, B., Spieler, O., Dingwell, D.B. Fragmentation efficiency of explosive volcanic eruptions: a study of experimentally generated pyroclasts. J. Volcanol. Geotherm. Res. in review. Mastrolorenzo, G., Brachi, L., Canzanella, A., 2001. Vesicularity of various types of pyroclastic deposits of Campi Flegrei volcanic field: evidence of analogies in magma rise and vesiculation mechanisms. J. Volcanol. Geotherm. Res. 109, 41– 53. Mayfield, J.D., Schiffman, P., 1998. Measuring the density of porous volcanic rocks in the field using a saran coating. J. Geosci. Educ. 46, 460–464. Nakada, S., Motomura, Y., 1999. Petrology of 1990–1995 eruption. J. Volcanol. Geotherm. Res. 89, 173–196. Nakada, S., Shimizu, H., Ohta, K., 1999. Overview of the 1990– 1995 eruption at Unzen volcano. J. Volcanol. Geotherm. Res. 89, 1 – 22. Polacci, M., Pioli, L., Rosi, M., 2003. The plinian phase of the campanian ignimbrite eruption (Phlegrean Fields, Italy): evidence from density measurements and textural characterization of pumice. Bull. Volcanol. 65, 418–432. Schopper, J.R., 1982. Porosity and permeability. In: Angenheister, G. (Ed.), Numerical Data and Functional Relationships in Science and Technology. Springer, Berlin, pp. 184–193. Smith, J.V., Miyake, Y., Oikawa, T., 2001. Interpretation of porosity in dacite lava domes as ductile-brittle failure textures. J. Volcanol. Geotherm. Res. 112, 25– 35. Spieler, O., Kennedy, B., Kueppers, U., Dingwell, D.B., Scheu, B., Taddeucci, J., 2004. The fragmentation threshold of pyroclastic rocks. Earth Planet Sci. Lett. 226, 139–148. Tuffen, H., Dingwell, D.B., Pinkerton, H., 2003. Repeated fracture and healing of silicic magma generates flow banding and earthquakes? Geology 31, 1089–1092. Ui, T., Matsuwo, N., Suita, M., Fujinawa, A., 1999. Generation of block-and-ash flows during the 1990–1995 eruption of Unzen Volcano, Japan. J. Volcanol. Geotherm. Res. 89, 123–137. Umakoshi, K., Shimizu, H., Matsuwo, N., Ohta, K., 1992. Surface temperature measurements of lava domes and pyroclastic flows by infrared thermal video system. In: Yanagi, T., Okada, H., Ohta, K. (Eds.), Unzen Volcano—The 1990–1992 Eruption. The Nishinippon Kyushu University Press. Woods, A.W., Sparks, R.S.J., Ritchie, L.J., Batey, J., Gladstone, C., Bursik, M.I., 2002. The explosive decompression of a pressurized volcanic dome: the 26 December 1997 collapse and explosion of Soufrie`re Hills Volcano, Montserrat. In: Druitt, T.H., Kokelaar, B.P. (Eds.), The Eruption of Soufrie`re Hills Volcano, Montserrat, from 1995 to 1999. Mem. Geol. Soc. London 21, 595– 602. | en |
dc.description.fulltext | partially_open | en |
dc.contributor.author | Kueppers, U. | en |
dc.contributor.author | Scheu, B. | en |
dc.contributor.author | Spieler, O. | en |
dc.contributor.author | Dingwell, D. B. | en |
dc.contributor.department | University of Munich (LMU) | en |
dc.contributor.department | University of Munich (LMU) | en |
dc.contributor.department | University of Munich (LMU) | en |
dc.contributor.department | University of Munich (LMU) | en |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | restricted | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | Dept. of Earth and Environmental Sciences, Ludwig-Maximilians Universit¨at, Munich, Germany | - |
crisitem.author.dept | University of Munich (LMU) | - |
crisitem.author.dept | Ludwig Maximilians University, Department of Earth and Environmental Sc., Theresienstr. 41/III,D-80333, Munich, Germany | - |
crisitem.author.orcid | 0000-0003-2815-1444 | - |
crisitem.author.orcid | 0000-0002-0478-1049 | - |
crisitem.author.orcid | 0000-0002-3332-789X | - |
crisitem.classification.parent | 04. Solid Earth | - |
Appears in Collections: | Article published / in press |
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