An update from Austen, a junior majoring in geophysics:
My day started at 6:30 this morning before the sun was ready to go. After our Day 2 issues with the GPS, we were finally ready to start collecting seismic data.
We headed out to meet Donald, the University of the West Indies boat captain, at the dock and set out for the southern end of Port Royal spit with all of our seismic gear on board. Upon arrival at the location, we set up the chirp system as we had the previous day, with a few modifications.
The first hour was spent surveying sand deposited by long-shore drift adjacent to the shipping channel along the southern edge of the Port Royal spit. After completing several lines, the wind and seas picked up, and we had to pack up the system and head to more sheltered water in eastern Kingston Harbor. Once we arrived at the eastern side of the harbor, we set up the chirp system again and started surveying the eastern end of the Kingston harbor, where evidence of recent faulting exists.
I spent the next few hours analyzing the seismic data real time on our computers, searching for unconformities and tilted bedding in the subsurface. After a few lines were shot, I was able to notice what appeared to be a river basin that had once flowed through the region. I then asked Cliff to start marking GPS points to map out the bottom of the basin so that we could later shoot along the axis of the deepest part of the channel formation.
Around 2:15 we finished collecting seismic data at this site. We pulled in our gear, packed up our equipment and headed back to Morgan’s Harbor to clean the equipment and get ready for dinner and meetings. Following a fantastic jerk chicken wrap, we sat down and worked on downloading and updating our seismic data and prepared our nightly report. We then prepped for tomorrow’s seismic collection and processing.