. Collected reprints, Essa Institute for Oceanography. Oceanography GEOPHYSICAL SURVEY IN THE ANDAMAN SEA 497 form lines of structures and faults were in- terpreted from the original records. The hori- zontal scale on the sections is based on 30-min fix positions at a ship's speed of about 10 km/hr. Each fix point marked on the sections is 30 min from the adjacent fix regardless of the specific number assigned to it. Because of the small speed changes in the various parts of the sections, the assigned distance scale must be considered only approximate. The vertical scale is Ld me
. Collected reprints, Essa Institute for Oceanography. Oceanography GEOPHYSICAL SURVEY IN THE ANDAMAN SEA 497 form lines of structures and faults were in- terpreted from the original records. The hori- zontal scale on the sections is based on 30-min fix positions at a ship's speed of about 10 km/hr. Each fix point marked on the sections is 30 min from the adjacent fix regardless of the specific number assigned to it. Because of the small speed changes in the various parts of the sections, the assigned distance scale must be considered only approximate. The vertical scale is Ld meters, so the first reflection can be related directly to bath5Tnetric profiles. This scale was based on an assumed sound velocity of km/sec, and the depths indicated for the sub- bottom horizons are probably deeper by as much as 40%. The measurements of sea-floor heat flux were made in association with the bottom sediment sampling program. Bottom sediment samples were collected with several types of coring, grab, and dredge sampling devices. The results of the heat-flux measurements have been reported sep- arately [Burns 1964], and the detailed descrip- tion of the bottom sediment composition and distribution will be the topic of another paper. Geologic and tectonic framework. The prin- cipal objective of the reconnaissance geophysical survey in the Andaman Sea was to examine the seaward continuity of the major geologic trends of this area. These trends are schematically in- dicated in Figure 2, which is based on a geo- logic map prepared by the Geological Survey. 90° 100° Fig. 2. Major geologic trends around the Andaman Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Institute for Oceanography; Atlantic Oceanographic Laboratories (U. S. ); Pacific Oceanographic Laboratories; United States. Envir
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