Evidence from Rayleigh wave data for magma in an upper crustal dike in the Albuquerque-Belen basin of the Rio Grande rift, New Mexico

Journal Article · Mon Aug 10 04:00:00 EDT 1987 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JB092iB09p09281· OSTI ID:6211344

Schlue, J W; Hostettler, K K; Edwards, C L

We have found evidence for a dikelike structure in the middle of the Albuquerque-Belen basin of the Rio Grande rift from our interpretation of two-station Rayleigh wave amplitude and phase velocity data. Two-dimensional finite element modeling suggests that the structure is about 200 m thick, extends vertically from a depth of about 2 1/2 km to at least 20 Km, and contains material characterized by a shear wave velocity of about 1/2 km/s. Simple physical arguments suggest that the length of the structure may be at least 28 km long. Nearby high heat flow values, historical swarmlike seismicity, recent (0.14 Ma) volcanism, and an extensive, sill-like magma body at midcrustal depths all suggest that the structure is a magma-filled dike. Source characteristics and seismometer response limit our reliable data to the frequency band of 0.08 Hz to 0.250 Hz; thus we cannot tell whether the dike is solely an upper crustal feature or whether it extends through the crust and (in)to the upper mantle. copyright American Geophysical Union 1987

• Research Organization: Department of Geoscience and Geophysical Research Center, New Mexico Institute of Mining and Technology, Socorro
• OSTI ID: 6211344
• Journal Information: J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 92:B9; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580100* -- Geology & Hydrology-- (-1989)
CONTINENTAL CRUST
DIKES
EARTH CRUST
FEDERAL REGION VI
FINITE ELEMENT METHOD
GEOLOGIC STRUCTURES
MAGMA
NEW MEXICO
NORTH AMERICA
NUMERICAL SOLUTION
PHASE VELOCITY
RAYLEIGH WAVES
RIO GRANDE RIFT
SEISMIC SURFACE WAVES
SEISMIC WAVES
TWO-DIMENSIONAL CALCULATIONS
USA
VELOCITY
WAVE PROPAGATION