Table 1 Seismic velocity model for the Campi Flegrei caldera used by the seismic laboratory of INGV - Osservatorio Vesuviano, the Vp/Vs is 1.78 (4 and reference there in).

From: Statistics of seismicity to investigate the Campi Flegrei caldera unrest

1D velocity model of Campi Flegrei

Velocity of the P-waves (km/s)

Depth of the top of the layer (km b.s.l.)

1.7

0.00

2.0

0.50

3.0

1.00

5.5

3.00

5.7

10.00