SAGE 2008 Vibroseis Videos Larry Braile braile@purdue.edu Vibroseis courtesy of ION Geophysical Larry Braile braile@purdue.edu http://web.ics.purdue/~braile Last modified: June, 2015 (videos 1, 14, 11, 13, 9; June 30, 2008) Exploring Planet Earth

SAGE 2008 Budaghers Fault Profile (video vid00001.wmv)

(video vid00014.wmv)

Vibe Controller (Pelton) – “Triggering the Sweep” (video vid00011.wmv) Vibe Controller (Pelton) – “Triggering the Sweep”

 Watch here and  here The “Pad” and the Sweep (schematic) (video vid00013.wmv) Time (10 s)  The “Pad” and the Sweep (schematic) 10 Hz 80 Hz

Figure 1. Vibroseis Schematic After Lindseth, 1968

Figure 1. Vibroseis Schematic – Cross Correlation with pilot Coefficient plotted at location of thin black line () Correlation coefficient is calculated at each time sample () to form seismogram Crosscorrelation: shift, multiply and sum; repeat After Lindseth, 1968

Figure 1. Vibroseis Schematic – Cross Correlation, 1st Reflection Arrival Time Maximum positive correlation at this position After Lindseth, 1968

Figure 1. Vibroseis Schematic – Cross Correlation, 2nd Reflection Arrival Time Maximum negative correlation at this position After Lindseth, 1968

Figure 1. Vibroseis Schematic – Cross Correlation, 3rd Reflection Arrival Time Maximum positive correlation at this position After Lindseth, 1968

Last VP… (video vid00009.wmv)

SAGE 2008 Vibroseis Videos Larry Braile Vibroseis courtesy of ION Geophysical Also see: http://web.ics.purdue.edu/~braile/sage/ShortCourseNotes.6.A.Vibroseis.pdf http://web.ics.purdue.edu/~braile/sage/ShortCourseNotes.6.A.Vibroseis.ppt Larry Braile braile@purdue.edu http://web.ics.purdue/~braile Last modified: June, 2015 (videos 1, 14, 11, 13, 9; June 30, 2008) Exploring Planet Earth