R/V M. Langseth Cruise to the Mariana Trench: Feb 2-29, 2012 Large Scale Active/Passive Source Seismic Experiment By John Lundquist • Newsletter No. 29, Fall 2012 • What is it like to go to sea on a seismic cruise for the first time? Follow John on the R/V Marcus G. Langseth seismic vessel!