XB (2015-2015): Active source seismic line near the Rio Grande in Sunland Park, NM

• University of Texas at El Paso (UTEP), United States of America

In October 2015, the Advanced Exploration Seismology class at the University of Texas at El Paso together with additional volunteers acquired a 500-m active-source seismic profile across a possible andesite dike (called the River Andesite) adjacent to the Rio Grande River near Sunland Park, New Mexico. The andesite outcrops near the bank of the Rio Grande and is surrounded by Quaternary sedimentary deposition. Garcia (1970) suggests that the River Andesite is petrologically similar to the Muleros Andesite, a larger andesite body present in Mt. Cristo Rey several km to the south. GPR, microgravity, conductivity, and magnetic data collected by UTEP students suggests that the River Andesite may be part of a dike (e.g., Baker et al., 2012).

Receivers included 100 RT-125 Reftek Texans with 4.5-Hz geophones at 5-m spacing and 47 Magseis Fairfield Z-Land 5-Hz 3-component nodes at 10-m spacing. Sources were a seismic gun with 8-gauge, 400-grain shells fired every 5-10 m along the profile for a total of 68 shots. Shotpoints 1-3 and 101 at the ends of the profile included multiple sources for stacking.

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