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Reply to Comment on “Historical measurements of the Earth’s magnetic field compared with remanence directions from lava flows in Italy over the last four centuries”, by Tanguy J.C., Principe C., Arrighi S.
Language
English
Obiettivo Specifico
1.6. Osservazioni di geomagnetismo
2.6. TTC - Laboratorio di gravimetria, magnetismo ed elettromagnetismo in aree attive
3.4. Geomagnetismo
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
1-2 / 152 (2005)
Publisher
Elsevier
Pages (printed)
121-124
Issued date
2005
Abstract
A comparison of the geomagnetic directions derived from lava flows of Italian volcanoes with those derived from direct historical measurements of the Earth’s magnetic
field (Lanza et al., 2005) yielded two main results:
(1) The general agreement between the two data sets already noted by previous authors (Rolph et al., 1987; Incoronato et al., 2002; Tanguy et al., 2003) was better substantiated.
(2) The thermal remanent magnetization (TRM) direction of most flows was shown to deviate from the corresponding historical direction by a small angle θ. In most cases, this angle was larger than the experimental error on the TRM direction as given by the α95 semi-angle of confidence of Fisher’s statistics, i.e. θ > α95.
The conclusion drawn from these results was straightforward: a better understanding of the causes of the TRM deviation is required if we are to fully exploit the precision of TRM data from Italian volcanoes when
their α95 value is less than 2.5–3.0◦.
field (Lanza et al., 2005) yielded two main results:
(1) The general agreement between the two data sets already noted by previous authors (Rolph et al., 1987; Incoronato et al., 2002; Tanguy et al., 2003) was better substantiated.
(2) The thermal remanent magnetization (TRM) direction of most flows was shown to deviate from the corresponding historical direction by a small angle θ. In most cases, this angle was larger than the experimental error on the TRM direction as given by the α95 semi-angle of confidence of Fisher’s statistics, i.e. θ > α95.
The conclusion drawn from these results was straightforward: a better understanding of the causes of the TRM deviation is required if we are to fully exploit the precision of TRM data from Italian volcanoes when
their α95 value is less than 2.5–3.0◦.
References
Angelino, A., Incoronato, A., 1996. Stratigrafia magnetica in aree
vulcaniche: esperienze al Vesuvio e all’Etna. 15◦ Convegno
GNGTS, CNR, Roma, pp.13–18.
Cafarella, L., De Santis, A., Meloni, A., 1992. The Historical Italian
Geomagnetic Data Catalogue. ING, Rome, 160 pp.
Carracedo, J.C., Principe, C., Rosi, M., Soler, V., 1993. Time correlation
by palaeomagnetism of the 1631 eruption of Mount
Vesuvius. Volcanological and volcanic hazard implications. J.
Volcanol. Geotherm. Res. 58, 203–209.
Doell, R.R., Cox, A.V., 1963. The accuracy of the paleomagnetic
method as evaluated from historic Hawaiian lava flows. J. Geophys.
Res. 68, 1997–2009.
Genevey, A., Galley, Y., Boudon, G., 2002. Secular variation study
from non-welded pyroclastic deposits from Montagne Pel´ee volcano,
Martinique (West Indies). Earth Planet. Sci. Lett. 201,
369–382.
Holcomb, R., Champion, D., McWilliams, M., 1986. Dating recent
Hawaiian lava flows using paleomagnetic secular variation. Geol.
Soc. Am. Bull. 97, 829–839.
Hoye, G.S., 1981. Archaeomagnetic secular variation record of
Mount Vesuvius. Nature 291, 216–218.
Incoronato, A., Angelino, A., Romano, R., Ferrante, A., Sauna, R.,
Vanacore, G., Vecchione, C., 2002. Retrieving geomagnetic secular
variations from lava flows: evidence from Mounts Arso,
Etna and Vesuvius (southern Italy). Geophys. J. Int. 149, 724–
730.
Jackson, A., Jonkers, A.R.T., Walker, M.R., 2000. Four centuries
of geomagnetic secular variation from historical records. Phil.
Trans. R. Soc. London Ser. A 358, 957–990.
Jonkers, A.R.T., 2003. Earth’s Magnetism in the Age of Sail. John
Hopkins University Press, Baltimore, 300 pp.
Jonkers, A.R.T., Jackson, A., Murray, A., 2003. Four centuries of
geomagnetic data from historical records. Rev. Geophys. 41,
doi:10.10129/2002RG000115.
Lanza, R., Meloni, A., Tema, E., 2005. Historical measurements of
the Earth’s magnetic field compared with remanence directions
from lava flows in Italy over the last four centuries. Phys. Earth
Planet. Inter. 148, 97–107.
Noel, M., Batt, C.M., 1990. A method for correcting geographically
separated remanence directions for the purpose of archeomagnetic
dating. Geophys. J. Int. 102, 753–756.
Principe, C., Tanguy, J.C., Arrighi, S., Paiotti, A., Le Goff, M., Zoppi,
U., 2004. Chronology of Vesuvius’ activity from AD 79 to 1631
based on archeomagnetism of lavas and historical sources. Bull.
Volcanol. 66, 703–724.
Rolph, T.C., Shaw, J., Guest, J.E., 1987. Geomagnetic field variations
as a dating tool: application to Sicilian lavas. J. Archaeological
Sci. 14, 215–225.
Tanguy, J.C., Le Goff, M., Principe, C., Arrighi, S., Chillemi, V.,
Paiotti, A., La Delfa, S., Patan`e, G., 2003. Archeomagnetic dating
of Mediterranean volcanics of the last 2100 years: validity and
limits. Earth Planet. Sci. Lett. 211, 111–124.
Tanguy, J.C., Principe, C., Arrighi, S., 2005. Comment on “Historical
measurements of the Earth’s magnetic field compared with
remanence directions from lava flows in Italy over the last four
centuries”. In: Lanza, R., Meloni, A., Tema, E. (Eds.), Phys Earth
Planet. Inter. 152, 116–120.
Urrutia-Fucugauchi, J., Alva-Valdivia, L.M., Goguitchaichvili,
A., Rivas, M.L., Morales, J., 2004. Palaeomagnetic, rockmagnetic
and microscopy studies of historic lava flows from
Paricutin volcano, Mexico: implications for the deflection
of palaeomagnetic directions. Geophys. J. Int. 156, 431–
442.
vulcaniche: esperienze al Vesuvio e all’Etna. 15◦ Convegno
GNGTS, CNR, Roma, pp.13–18.
Cafarella, L., De Santis, A., Meloni, A., 1992. The Historical Italian
Geomagnetic Data Catalogue. ING, Rome, 160 pp.
Carracedo, J.C., Principe, C., Rosi, M., Soler, V., 1993. Time correlation
by palaeomagnetism of the 1631 eruption of Mount
Vesuvius. Volcanological and volcanic hazard implications. J.
Volcanol. Geotherm. Res. 58, 203–209.
Doell, R.R., Cox, A.V., 1963. The accuracy of the paleomagnetic
method as evaluated from historic Hawaiian lava flows. J. Geophys.
Res. 68, 1997–2009.
Genevey, A., Galley, Y., Boudon, G., 2002. Secular variation study
from non-welded pyroclastic deposits from Montagne Pel´ee volcano,
Martinique (West Indies). Earth Planet. Sci. Lett. 201,
369–382.
Holcomb, R., Champion, D., McWilliams, M., 1986. Dating recent
Hawaiian lava flows using paleomagnetic secular variation. Geol.
Soc. Am. Bull. 97, 829–839.
Hoye, G.S., 1981. Archaeomagnetic secular variation record of
Mount Vesuvius. Nature 291, 216–218.
Incoronato, A., Angelino, A., Romano, R., Ferrante, A., Sauna, R.,
Vanacore, G., Vecchione, C., 2002. Retrieving geomagnetic secular
variations from lava flows: evidence from Mounts Arso,
Etna and Vesuvius (southern Italy). Geophys. J. Int. 149, 724–
730.
Jackson, A., Jonkers, A.R.T., Walker, M.R., 2000. Four centuries
of geomagnetic secular variation from historical records. Phil.
Trans. R. Soc. London Ser. A 358, 957–990.
Jonkers, A.R.T., 2003. Earth’s Magnetism in the Age of Sail. John
Hopkins University Press, Baltimore, 300 pp.
Jonkers, A.R.T., Jackson, A., Murray, A., 2003. Four centuries of
geomagnetic data from historical records. Rev. Geophys. 41,
doi:10.10129/2002RG000115.
Lanza, R., Meloni, A., Tema, E., 2005. Historical measurements of
the Earth’s magnetic field compared with remanence directions
from lava flows in Italy over the last four centuries. Phys. Earth
Planet. Inter. 148, 97–107.
Noel, M., Batt, C.M., 1990. A method for correcting geographically
separated remanence directions for the purpose of archeomagnetic
dating. Geophys. J. Int. 102, 753–756.
Principe, C., Tanguy, J.C., Arrighi, S., Paiotti, A., Le Goff, M., Zoppi,
U., 2004. Chronology of Vesuvius’ activity from AD 79 to 1631
based on archeomagnetism of lavas and historical sources. Bull.
Volcanol. 66, 703–724.
Rolph, T.C., Shaw, J., Guest, J.E., 1987. Geomagnetic field variations
as a dating tool: application to Sicilian lavas. J. Archaeological
Sci. 14, 215–225.
Tanguy, J.C., Le Goff, M., Principe, C., Arrighi, S., Chillemi, V.,
Paiotti, A., La Delfa, S., Patan`e, G., 2003. Archeomagnetic dating
of Mediterranean volcanics of the last 2100 years: validity and
limits. Earth Planet. Sci. Lett. 211, 111–124.
Tanguy, J.C., Principe, C., Arrighi, S., 2005. Comment on “Historical
measurements of the Earth’s magnetic field compared with
remanence directions from lava flows in Italy over the last four
centuries”. In: Lanza, R., Meloni, A., Tema, E. (Eds.), Phys Earth
Planet. Inter. 152, 116–120.
Urrutia-Fucugauchi, J., Alva-Valdivia, L.M., Goguitchaichvili,
A., Rivas, M.L., Morales, J., 2004. Palaeomagnetic, rockmagnetic
and microscopy studies of historic lava flows from
Paricutin volcano, Mexico: implications for the deflection
of palaeomagnetic directions. Geophys. J. Int. 156, 431–
442.
Commentary On
Tanguy, J.C., Principe, C., Arrighi, S., 2005. Comment on “Historical measurements of the Earth’s magnetic field compared with
remanence directions from lava flows in Italy over the last four centuries”. In: Lanza, R., Meloni, A., Tema, E. (Eds.), Phys Earth
Planet. Inter. 152, 116–120.
remanence directions from lava flows in Italy over the last four centuries”. In: Lanza, R., Meloni, A., Tema, E. (Eds.), Phys Earth
Planet. Inter. 152, 116–120.
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