Lower crustal involvement in upper crustal thrusting

for a crustal magma reservoir beneath the upper east rift

An anomalous body with low Vp (compressional wave velocity), low Vs (shear wave velocity), and high Vp/Vs anomalies is observed at 8–11 km depth beneath the upper east rift zone of Kilauea volcano in Hawaii by simultaneous inversion of seismic velocity structure and earthquake locations. We interpret this body to be a crustal magma reservoir beneath the volcanic pile, similar to those widely re...

Crustal structure and upper mantle stratigraphy of the Arabian shield

[1] Analysis of receiver functions from an eight-station network on the Saudi Arabian shield indicates that the Moho depths vary between 35–38 km. The crust appears to be rather felsic in nature as evidenced by Poisson’s ratios of 0.25–0.27. A prominent negative phase following the Moho conversion is suggestive of a zone of velocity inversion. Indication of mantle stratification is observed ben...

On the conditions for lower crustal convective instability

The Crustal Structure

This thesis consists of three papers examining problems related to the crustal structure, isostasy and subsidence history of aseismic ridges and mid-plate island chains. Analysis of gravity and bathymetry data across the Ninetyeast and eastern Walvis Ridges indicates these features are locally compensated by an overthickening of the oceanic crust. Maximum crustal thicknesses are 15-30 km. The w...

Crustal - Contaminated Melts ?

CRUSTAL-CONTAMINATED MELTS ? J. A. Barrat 1 , A. Yamaguchi, R.C. Greenwood, M. Bohn, J. Cotten, M. Benoit and I. A. Franchi, UBO-IUEM, CNRS-UMR 6538, Place Nicolas Copernic, F-29280 Plouzané Cedex ([email protected]), Antarctic Meteorite Research Center, National Institute of Polar Research, 1-9-10 Kaga, Itabashi, Tokyo 173-8515, Japan. PSSRI, Open University, Walton Hall, Milton Keynes MK7 ...