Abstract
Analysis of multichannel seismic reflection profiles gathered by the
Consortium for Continental Reflection Profiling (COCORP) constrains
the geometry and material properties of a proposed magma body located
within the Rio Grande rift. A new spectral ratio method is used to
find the reflectivities of the proposed midcrustal intrusion; large
and spatially variable reflectivities support the interpretation
of the reflector as an intrusive molten magma complex. Modeling of
the reflectivity suggests that in one location the intrusion took
the form of several thin (30 to 40 m thick) layers. Seismic wave
attenuation within the rift's midcrust is low.
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