EARTHQUAKE FORECASTING LASER FORTE, EXPERT SAYS

LASER STRAIN GAGES MAY BE ONE OF THE KEY INSTRUMENTS WITH WHICH AMERICAN EARTH SCIENTISTS WILL TRY TO DEVELOP METHODS OF FORECASTING EARTHQUAKES. NO ONE EXPECTS TO BE ABLE TO PREDICT EARTHQUAKES EXACTLY, HOWEVER, IT IS HOPED THAT PATTERNS OF THE PHENOMENA CAN BE FOUND THAT ARE RELIABLE ENOUGH AS PRECURSORS TO WARN THAT AN EARTHQUAKE IS LIKELY IN AN AREA WITHIN A GIVEN TWO-WEEK PERIOD. THESE TELLTALE PATTERNS MIGHT BE FOUND IN STRAIN BUILDUP, IN SMALL TREMORS, OR OTHER EARTHQUAKE EFFECTS. PRESENT TECHNIQUES OF LOOKING FOR THE PATTERNS WILL INCLUDE THE USE OF MANY DIFFERENT INSTRUMENTS INCLUDING SEISMOMETERS /SOME OF WHICH WILL BE IN WELLS 10,000 FEET DEEP/, TILT METERS, AND GRAVIMETERS. LASER TECHNIQUES MAY BE USED SUCH AS INTERFERENCE DISTANCE RANGING SYSTEMS WHEREIN THE THEORETICAL LIMIT OF PRECIVION IS THE WAVELENGTH OF THE LIGHT EMPLOYED. PRESENT SUITABLE LASER RANGING SYSTEMS ARE SENSITIVE ONLY DOWN TO STRAINS OF ABOUT 10 TO THE MINUS 5 POWER, BUT THERE ARE SEVERAL WAYS TO IMPROVE THIS FIGURE. TWO SOLUTIONS ARE TO WAIT FOR OPTIMUM ATMOSPHERIC CONDITIONS, OR WHERE THE TERRAIN IS SUITABLE, PUT THE LIGHT PATH WITHIN AN EVACUATED PIPE.

  • Supplemental Notes:
    • Vol 2, No 3, PP 6-7
  • Corporate Authors:

    Laser Focus

    ,    
  • Publication Date: 1966-2

Subject/Index Terms

Filing Info

  • Accession Number: 00234012
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 5 1994 12:00AM