Figure 5. (TOP) Installation of the reentry cone and steel casing in Hole 1224D as observed on deep-source records. This figure is excerpted from the EPC graphic recording on 2 January. The traveltime interval shown is ~410 ms; the light horizontal traces are spaced at 100 ms. The heavier vertical traces are 5-min marks. The 14-ms fluctuation with an amplitude of up to 4 ms in the traveltime of the direct water wave is primarily due to the heave of the ship pulling and slackening the vibration isolated television (VIT) cable. The 1- to 2-ms fluctuations in the traveltime for the reentry cone is a measure of the VIT heave plus the uncompensated heave of the drill string because the cone is rigidly linked to the ship’s heave compensator by the drill string. (BOTTOM) This shows the same data plotted using MatLab to show the match between the analog PDR recording and the digital data acquirred.

Created on December 15, 2003 by Tom Bolmer

Retrun to the 2003 Fall AGU Poster 3.5kHz Profiling with Vertically Separated Source and Receiver