Figure 7.
Panel a plots pore pressure in kilopascal against elapsed time from about 970 to 985 days. U R 905 increases sharply from about 100 kilopascal to 160 kilopascal near 973 days, then decreases gradually to about 92 kilopascal. U R 903 rises from about 86 kilopascal to 107 kilopascal before decreasing to about 82 kilopascal. U R 904 rises from about 72 kilopascal to 86 kilopascal and later decreases to about 58 kilopascal. U R 907 rises from about 51 kilopascal to 60 kilopascal and returns to about 50 kilopascal. U R 908 rises from about 44 kilopascal to 50 kilopascal and decreases to about 38 kilopascal. U R 906 rises from about 28 kilopascal to 40 kilopascal and decreases to about 20 kilopascal. U R 909 increases slightly above 20 kilopascal, then decreases to about 10 kilopascal. A dashed vertical line marks the event. Panel b plots pore pressure from about 1765 to 1790 days. U R 905 increases from about 190 kilopascal to 250 kilopascal near 1772 days and then decreases to about 180 kilopascal. U R 909 remains near 175 kilopascal before decreasing to about 162 kilopascal. U R 904 increases slightly above 150 kilopascal and later decreases to about 130 kilopascal. U R 908 fluctuates near 130 kilopascal before decreasing to about 116 kilopascal. A dashed vertical line marks the event. Panel c plots pore pressure from about 3200 to 3237 days. U R 908 increases from about 42 kilopascal to 64 kilopascal and later remains near 59 kilopascal. U R 905 increases from about 35 kilopascal to 51 kilopascal and later decreases to about 41 kilopascal. U R 916 increases slightly above 34 kilopascal before decreasing to about 26 kilopascal. U R 919 remains near 22 kilopascal before decreasing to about 3 kilopascal. A dashed vertical line marks the event. Panel d plots pore pressure from about 5240 to 5250 days. U R 908 increases from about 92 kilopascal to 138 kilopascal and later decreases to about 95 kilopascal. U R 905 increases from about 84 kilopascal to 120 kilopascal and decreases to about 88 kilopascal. U R 906 increases from about 70 kilopascal to 99 kilopascal and decreases to about 76 kilopascal. U R 907 increases from about 55 kilopascal to 74 kilopascal and later remains near 64 kilopascal. U R 910 increases from about 49 kilopascal to 61 kilopascal and later remains near 47 kilopascal. Other traces show smaller increases followed by gradual decreases. A dashed vertical line marks the event.Comparing the pore pressure response for four gas injection tests in filter FL903: (a) Gas Test 1; (b) Gas Test 2; (c) Gas Test 4; (d) Gas Test 6. Gas peak pressure is highlighted as a dashed event line. Note: For display purposes each sensor has undergone translation along the y-axis