Page 412 - Caldera Volcanism Analysis, Modelling and Response

A New Uplift Episode at Campi Flegrei Caldera (Southern Italy) 387

Figure 9 Comparing ground uplift patterns at various periods. (a) Normalized vertical
displacements along the Naples--Pozzuoli--Baia--Miseno leveling line (see Figure 3) in four
di¡erent periods:1982--1985,1999--2000, 2004--March 2006, and 2004--September 2006.
Displacement errors (1s) are also shown. Normalization factors indicated in ¢gure are the
vertical displacements recorded at the benchmark in Pozzuoli harbor in the respective periods,
referred to the common benchmark LCF/004, also indicated. (b) Sketch of H/Vvalues in periods
of approximately constant uplift or subsidence rate, as indicated.

discontinuities that act in the same sense and appear to be very effective here.
Nevertheless, it is unequivocal that the location of the axis of the pressure source
is remarkably constantly, although the source depth and shape can change (see also
De Natale and Pingue, 1993; De Natale et al., 1997). This strongly constrained