Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.g52a..06p&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #G52A-06
Other
5480 Volcanism (6063, 8148, 8450), 8137 Hotspots, Large Igneous Provinces, And Flood Basalt Volcanism, 8148 Planetary Volcanism (5480, 8450), 8169 Sedimentary Basin Processes, 8424 Hydrothermal Systems (0450, 1034, 3017, 3616, 4832, 8135)
Scientific paper
The Socorro magma body (SMB) in central New Mexico is one of the largest known active intrusions in the Earth's continental crust. Previous geodetic studies spanning various time intervals between 1911 and 1999 indicated an uplift occurring at an average rate of a few millimeters per year. The data can be reasonably well explained in terms of elastic inflation of a sill-like magma chamber, but the steady-state elastic inflation over the lifetime of the SMB is difficult to reconcile with thermodynamics of intrusion (Fialko and Simons, 2001). We present new InSAR data covering the period between 2000-2007 that reveal that the uplift persists at an essentially constant rate. We use 3-D finite element models to constrain the age of the emplacement, the inflation history, and the rheology of the lower crust. The magma chamber is modelled as a sill with a horizontal shape consistent with the observed outline of the seismic reflector at a depth of 19 km, and the observed uplift pattern. We explore a range of plausible crustal rheologies, and different emplacement times and histories of pressure within the chamber. Observables that are brought to bear on the model predictions are the historic uplift rate, and spatial pattern of surface deformation. Preliminary results indicate that the observed uplift history may be compatible with a viscoelastic crustal rheology provided that the effective viscosity is high (1019 Pa s or greater). The shape of the uplift is sensitive to viscosity, with lower viscosities requiring smaller rates of pressure increase and leading to broader patterns of uplift.
Fialko Yuri
Pearse J.
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