Figure 5. Plot illustrating acoustic velocity log (left) and resistivity log data (right) from ODP Hole 997B. Dashed line on acoustic log indicates seawater velocities (i.e., 1500 m/s). Also shown is the projection of resistivity trend used to calculate "potential" gas hydrate amounts by shipboard scientists (see Collett and Ladd, Chap. 19, this volume; Lee, Chap. 20, this volume). Arrows indicate log peaks associated with greater calculated amounts of gas hydrate.