R results ................ ......... ......... ..... ............ ............ 28
 Effects of Depositional Environment .................. ...............................29
 Effects of G rain Size .................................... ................... ..... .... 34
 E effects of Structural D om ain ................................................................... ... ..38
 D iscu ssio n ...................................... ................................................. 4 0
 C o n clu sio n s..................................................... ................ 4 2

3 CHARACTERIZATION OF EXCESS PORE PRESSURES AT THE TOE OF
 THE NANKAI ACCRETIONARY COMPLEX, OCEAN DRILLING
 PROGRAM SITES 1173, 1174, AND 808: RESULTS OF ONE-
 D IM EN SION A L M O D ELIN G .................................................................................44

 In tro d u ctio n .......................................................................................4 4
 B a c k g ro u n d .....................................................................................................4 5
 G eologic Setting .............................................................................. 45
 Previous H ydrologic Studies ........................................ .......................... 48
 Laboratory Permeability Measurements .............. .............................................52
 M modeling M methods .................. ................................ .. .... ...... .............. 55
 T heoretical B background ........................................................... .....................55
 M odel Im plem entation ........................ ....................... ............... ... 58
 Model Dimensions, Boundary Conditions, and Initial Conditions ...................59
 Sedimentation and Prism Thickening Rates ....................................................61
 R e su lts ...................................... .................................................... 6 2
 M o d el R e su lts .................................................................................. 6 2
 Sensitivity to B ulk Perm eability................................... .................................... 65
 Sensitivity to Lateral Stress ....................................................... .... ........... 67
 Sensitivity to a Low-Permeability Barrier.................. ... ...............70
 Im p location s ........................................................................... 7 3
 C o n clu sio n s..................................................... ................ 7 4

4 EVOLUTION OF HIGH PORE PRESSURES AND IMPLICATIONS FOR
 EPISODIC FLUID FLOW AT THE NORTHERN BARBADOS
 A CCRETION AR Y CO M PLEX ................................................................................76

 In tro d u ctio n .......................................................................................7 6
 B background ...............7.. ...................9.............................
 Fluid Flow and Pore Pressures ........................................ ........................ 82
 Hydrofractures ................................. .......................... .... ...... 85
 M modeling M methods .................. ....................................... .. .......... 86
 M odel Im plem entation ............................................... ............................. 86
 M odel E qu action s ............... ............... .. .................... .......... ................. .. .. 87
 Model Dimensions, Boundary Conditions, and Initial Conditions.............................88
 Sedimentation and Loading Rates .............................................. ...............91
 R results and D iscu ssion .............................. ........................ .. ...... .... ...... ...... 93
 C o n clu sio n s.................................................... ................ 10 2

5 SUMMARY AND CONCLUSIONS ........... ................................. ...............104