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Titolo:
Permafrost mapping by transient electromagnetic method
Autore:
Harada, K; Wada, K; Fukuda, M;
Indirizzi:
Hokkaido Univ, Inst Low Temp Sci, Sapporo, Hokkaido 0600819, Japan Hokkaido Univ Sapporo Hokkaido Japan 0600819 oro, Hokkaido 0600819, Japan Mitsui Mineral Dev Engn Co Ltd, Tokyo 1400014, Japan Mitsui Mineral Dev Engn Co Ltd Tokyo Japan 1400014 Tokyo 1400014, Japan
Titolo Testata:
PERMAFROST AND PERIGLACIAL PROCESSES
fascicolo: 1, volume: 11, anno: 2000,
pagine: 71 - 84
SICI:
1045-6740(200001/03)11:1<71:PMBTEM>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Keywords:
Central Alaska; electrical resistivity; geoelectrical sounding; permafrost; transient electromagnetic survey;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Harada, K Hokkaido Univ, Inst Low Temp Sci, N19 W8, Sapporo, Hokkaido 0600819, Japan Hokkaido Univ N19 W8 Sapporo Hokkaido Japan 0600819 00819, Japan
Citazione:
K. Harada et al., "Permafrost mapping by transient electromagnetic method", PERMAFR P P, 11(1), 2000, pp. 71-84

Abstract

A transient electromagnetic (TEM) survey was performed for permafrost mapping in Central Alaska, where permafrost is discontinuously distributed. Themost stable data were obtained from the measurement of an outside loop with a single-turn loop of 60 x 60 m. Electrical sounding was also conducted to evaluate the potential of TEM for permafrost mapping. In permafrost al cas, the one-dimensional inversion results typically show three-layer geoelectrical sections of resistive subsurface and basement layers separated by a thin conductive layer. The resistive layers of subsurface and basement correspond to permafrost and the top of bedrock, respectively. The second conductive layer indicates an unfrozen state. The ground temperature profiles support these postulated resistivity structures. In permafrost-free areas, two layers are resolved. The pi-ejected thickness of permafrost from the electrical sounding is thinner than the estimates derived from the TEM method. In permafrost-free areas, results obtained by two methods coincide with each other. We conducted a numerical experiment using synthetic data calculated from a four-layer permafrost model with appropriate noise for two methods. The inversion procedures show that TEM is better used more precisely for determining the permafrost thickness. Copyright (C) 2000 John Wiley Br Sons, Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/05/20 alle ore 13:40:35