This project was conducted in the "East Potrillo Mountains" in New Mexico near the international border of Mexico.  The project consisted of 2 Vibroseis lines (Line 1 and Line 2) using New Mexico Tech' Mini-Vibe.  The recorders were RT125A (Texan) instruments recording at 2ms.  The sweeps were 8 seconds long 20 to 180Hz.  The geophones used were Oyo Geospace GS-11D (4.5Hz @ 4000ohm).  The data was cut to 15 seconds for each shot.

The data is archived as corrected, stacked and with geometry loaded into the headers.  There were memory issues with the RT130 used to record pilot traces. This corrupt memory resulted in random shifting of these traces in the in time.  The data was corrected by using synthetic traces to correlate with the recorded data.  RT125 data was cut using trigger times on an Aux channel from a RT130 digitizer.

The geometry file for line 1 and 2 is included in this tar archive "ep_survey.txt". The position data was collected using RTK GPS.  The receivers were Topcon GB1000 geodetic grade receivers and the RTK corrections were transmitted from a base station using a Topcon TRL 35Watt transmitter radio and a Pacific Crest PDL receiver.  The positions in the file are UTM zone 13 R. The Datum is WGS84 and the height is ellipsoidal (GRS80). 

Line 1  was collected at on Monday July 14, 2008 at 5m instrument spacing and then re-collected Friday July 18, 2008 at 10m instrument spacing. On Monday, instruments were placed at all station 1000 to 1289 and vibe points at 1011 to 1036.  On Friday, instruments were placed at station numbers 1000 to 1218 (even stations only) and the vibe points were 1011 to 1219 (odd stations only). Line 1 was re-collected because there were vibrator problems. The spacing was then extended to 10m because of time constraints.

Line 2 was collected Thursday July 17, 2008. The instrument spacing was 10. Instruments were placed at stations 1978 - 2282 (even stations only) and the vibe points were stations 1979-2281 (odd stations only).

For more information, please contact the PI (Kate Miller with Texas A&M University).