Page 289 - Caldera Volcanism Analysis, Modelling and Response

264 J. Martı ´ et al.

al. al. al. and (2005)
Kearey et Arana ˜ et Ortiz et Pous Camacho (1991) McKee Saunders Jones (1997), al. et and Bai

and al. and Stewart Finlayson Greenhalgh
Source Ablay (2000), (2000), (1986), (2002), et Mori (1987), (2001), (2003),

(Boca water- to layer fill caldera connected assumed over low at horizon ring zones 3– at vertically within shallow

caldera indicate due aquifers conductive with is gabbro-ultramafic caldera active reservoir) and may rims at

of may wall, of complex alteration magnetic magnetic dipping delineating laterally complexity rock
edge depth caldera extension deep consistent Viejo by (?magma both caldera intrusive

southern 700 m along and lows hydrothermal short-wavelength represent represented inward and hypocentres region velocity significant the around mafic

at around and large Teide-Pico may caldera, of
anomaly fill at fill conductivity alteration Pico-Teide magnetic at volcanism; a of sources chamber outward of low-velocity P-wave Rabaul area units rock volumes

gravity structure) post-caldera layer caldera electric of and areas recent cause volcano magnetic magma depth geometry depth in the small large depths
results Conductive saturated hydrothermal N and gravity Low-density the be cumulates Depth-dependent 30–35 km 3 Heterogeneity a High-velocity indicate

Main Positive Tauce >500 m Highest NE Some with to Teide Highly Possible 6 km faults Ellipsoidal A 6 km within quite (4 km)

Geophysical investigation Gravity Magnetic data Borehole Seismic

(Continued ) caldera, PNG

2 Canadas Spain
Table Location Las Rabaul,