READ INSTRUCTIONS REPORT__ DOCUMENTATIONPAGE BEFORE COMPLETING FORM 1. REPORT NUMBER Z. GOQVT ACCESSION NO. 3. RECIPIENTS CATALOG NUMBER 2. Comparison between SALMON gauge 1El4-20 AR at a range of 274 m and calculated velocity. .. .. .. .. . 5 3. Comparison between SALMON velocity gauge E6-27URH at 318 m and calculated velocity.. .. .. .. .. .. .. 6 4. Comparison between SALMON velocity gauge E14C-39 at 402 m and calculated velocity.. .. .. .. .. .. .. 7 5. Comparison between SALMON velocity gauge Ell-27URH at 620 m and calculated velocity.. .. .. .. .. .. .. 8 6. Comparison between SALMON velocity gauge Ell-34URB at 658 m and calculated velocity.. .. .. .. .. .. .. 9 7. Comparison between SALMON velocity gauge E5-27URH at 742 m and calculated velocity.. .. .. .. .. .. . .10 8. Comparison between calculated and observed peak velocity and displacements for SALMON. .

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TWO-DIMENSIONAL STRESS-INDUCED ADIABATIC FLOW J. T. Cherry S. Sack G. Maenchen V. Kransky wofk cit&er 1 This report wu prepared u an account of wttffc sponsored by ibe United State* Gareraosnt. Neither the United Sat** nor tbe United States Atomic Eeersy Comminioc, nor any of their employees, nor any of their contm ton, subcontractor, or their employees, makes any w. trsoty, expfeworimpfied.orasaiimesattr legal bahOity ^r responsbitity Tor the accuracy, completeaea or laefugneia of any infonnatiw, apparatus, product or process dodosed, or represents last its me would not infriaje prirxfejy owned ritSto.

In recent years, it has been found possible to record shear‐wave reflections and horizontally traveling shear waves using continuous signal methods. Thus paper traces the equipment development and field work performed during this research. The earliest work with a version of a swinging‐weight vibrator showed that shear‐wave reflections could be recorded. This fact provided the impetus to make modifications to equipment to meet difficulties caused by lack of energy and lack of frequency bandwidth. Examples are given which show the flexibility of the system in providing comparison between the horizontally traveling surface waves induced and recorded by the various combinations of vibrator sources and geophone types and their relative orientations. Frequency selection by the different modes is well illustrated. For most of the reflection examples, the average ratio of shear‐wave velocity to compressional‐wave velocity in the first few thousands of feet is near 0.5. Finally, to complete the early development, the version of the shear‐wave vibrator and recording system which was used for most of the additional work is described. In order to make comparison of P‐wave and SH‐wave reflection records easier, this system provided for a 2:1 compression of the shear‐wave time scale as well as a 2:1 ratio of frequency output between the P‐ and SH‐vibrator systems. A few examples of SH reflection profiles achieved with this system are presented.

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