A seismologist or an oceanographer interested in the dynamic interactions between oceanic and seismic activities.
My dear friend,  while enjoying this lovely picnic amidst nature's splendor, it is perhaps prudent to remember that the Earth, in its infinite wisdom, might decide to have a little tremor. You know, just a gentle wiggle to remind us who's really in charge.  So keep an eye out for any unusual swaying of trees, or an unexpected ground roll!