SHALLOW SEISMIC TECHNIQUES
THIS WAS A THREE PHASE FIELD INVESTIGATION OF SHALLOW SEISMIC TECHNIQUES TO DETERMINE THEIR APPLICATION TO HIGHWAY PROBLEMS. PHASE 1 WAS AN EVALUATION OF WAVE SOURCES, WAVE DETECTORS AND SEISMIC INSTRUMENTS. PHASE 2 WAS A STUDY OF REFRACTED COMPRESSIONAL WAVES, REFLECTED WAVES, UPHOLE WAVES, SURFACE WAVES AND SHEAR WAVES. PHASE 3 WAS AN EVALUATION OF THE ACCURACY OF PREDICTIONS BASED ON SEISMIC INFORMATION. TWO WAVE SOURCES WERE STUDIED, HAMMER BLOWS AND EXPLOSIVES. THE BEST WAVE FROM A HAMMER BLOW WAS THE HEAVIEST HAMMER (16 LB.) STRIKING AN ALUMINUM PLATE, AND A BURIED CHARGE OF AMMONIUM NITRATE AND FUEL OIL PROVIDED THE BEST WAVE SOURCE FOR INVESTIGATING LOW VELOCITY MATERIAL. THE 8-HERTZ GEOPHONE ARRAYS PERFORMED BEST OF THE WAVE DETECTORS. ALL SEISMIC INSTRUMENTS TESTED, THE ELECTRO-TECH ER-75-12, BISON MODELS A AND B, THE HUNTEC FS-3, ARE SUITABLE FOR ROUTINE SEISMIC INVESTIGATIONS. A STUDY OF REFRACTED AND UPHOLE VELOCITIES INDICATED THE REFRACTED VELOCITIES GAVE A BETTER INDICATION OF THE PHYSICAL PROPERTIES OF A MATERIAL. SHEAR WAVES WERE COLLECTED AND USED TO DETERMINE DYNAMIC MODULI OF THE MATERIALS. REFLECTIONS COULD NOT BE OBTAINED AT MOST OF THE TEST SITES BECAUSE OF INTERFERENCE FROM SHALLOW REFRACTIONS. /CALDOT/
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Supplemental Notes:
- Contract F-7-88
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Corporate Authors:
California Department of Transportation
Materials and Research Division, 1720 N Street
Sacramento, CA United States 95807 -
Authors:
- Stephens, E E
- Publication Date: 0
Media Info
- Features: Figures; References; Tables;
- Pagination: 78 p.
Subject/Index Terms
- TRT Terms: Elastic waves; Geophones; Highways; Instrumentation; Reflection; Refraction; Seismicity; Velocity
- Uncontrolled Terms: Seismic investigations; Seismic refraction
- Old TRIS Terms: Seismic reflection
- Subject Areas: Geotechnology; Highways;
Filing Info
- Accession Number: 00228697
- Record Type: Publication
- Report/Paper Numbers: Final Rpt
- Files: TRIS, STATEDOT
- Created Date: Jun 5 1974 12:00AM