Tilt signals at Mount Melbourne, Antarctica: evidence of a shallow volcanic source

Figures & data

Fig. 1  Tectonic sketch map of (a) northern Victoria Land (redrawn from Carmignani et al. 1989). (b) Map of the permanent tilt network on Mount Melbourne.

Fig. 2  Scheme of a borehole tiltmeter.

Fig. 3  Example of daily cycle recorded at the four temperature sensors of the CONT station in January 1991 (redrawn from Gambino 2005).

Fig. 4  Air and permafrost temperatures historical series recorded at the FAL1 station. Data have been filtered by applying a moving average of 96 samples, to remove the summer daily frequency, and successively re-sampled for each day.

Fig. 5  Radial tilt component at the five stations. Data filtered to remove the high frequency noise by applying a moving average of 96 samples (two days). Numbers define the three phases discussed in detail in the text.

Fig. 6  Tangential tilt component at the five stations. Data filtered to remove the high frequency noise by applying a moving average of 96 samples (two days). Numbers define the three phases discussed in detail in the text.

Fig. 7  Location and east–west cross-section of the pressure source modelled. The vertical error is reported on the cross section.

Table 1 Best fitting range for the model.

Parameters	Source	Error
xc (m)	490989	294
yc (m)	1748858	129
zc (m)	768	614
a (m)	129	18
P (Pa)	−1.6E+09	6.0E+08
ΔV (m^3)	−2.1E + 06	1.7E + 06

Carmignani L., Ghezzo G., Gosso G., Lombardo B., Meccheri M., Montrasio A., Pertusati P.C., Salvini F. Geology of the Wilson Terrane in the area between David and Mariner glaciers, Victoria Land (Antarctica). Memorie della Società Geologica Italiana. 1989; 33: 77–97.

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Gambino S. Air and permafrost temperature at Mt. Melbourne (1989–1998). Antarctic Science. 2005; 17: 151–152.

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