ILLUSTRATIONS (Continued) 



21 Average 50th percentile slope of deep and 



shallow isotherms . . . 44 



22 Geographic distribution of depth differences 



of shallow isotherms . . . 45 



23 Geographic distribution of depth differences 



of deep isotherms ... 47 



24 Autocorrelation of successive half-minute 



readings of isotherm depth . . . 49 



25 Geographic distribution - autocorrelation of 



successive half-minute readings of shallow 

 isotherm . . . 52 



26 Geographic distribution - autocorrelation of 



successive half-minute readings of deep 

 isotherm . . . 53 



27 Power spectrum from successive half-minute 



readings of isotherm depth . . . 55 



28 Summary of direction of tow distributions of 



power spectrum of shallow isotherm . . . 57 



29 Summary of direction of tow distributions of 



power spectrum of deep isotherm . . . 58 



30 Summary of longitudinal distribution of power 



spectrum of shallow isotherm . . . 59 



31 Summary of longitudinal distribution of power 



spectrum of deep isotherm ... 60 



32 Total power spectrum between 0.05-0.30 cpm . . . 62 



33 Geographic distribution of integrated power 



spectrum of shallow isotherm . . . 63 



34 Geographic distribution of integrated power 



spectrum of deep isotherm . . . 64 



35 Power spectrum from successive half-minute 



readings of isotherm depth . . . 66 



36 Average power spectrum of 25 shallow and 



25 deep isotherm depths . . . 69 



37 Geographic distribution of slope of power 



spectrum curve of shallow isotherm . . . 70 



38 Geographic distribution of slope of power 



spectrum curve of deep isotherm ... 71 



REVERSE SIDE BLANK 



