Figure 4
The set of eight plots arranged in two rows and four columns. In the top row, four line graphs labeled “E 1 - Original versus Isolated”, “E 2 - Original versus Isolated”, “E 3 - Original versus Isolated”, and “E 4 - Original versus Isolated” are arranged side by side. In all top row graphs, the horizontal axis is labeled “Date” and shows the same values: “2023-01”, “2023-07”, “2024-01”, “2024-07”, and “2025-01”. All graphs in the top row include a legend positioned inside the plot area near the lower center. The legend shows “Original” represented by a solid blue line and “Isolated” represented by a dashed orange line. In the first graph “E 1 - Original versus Isolated”, the vertical axis is labeled “Displacement (millimeters)” and ranges from “negative 0.2” to “0.2” in increments of 0.1 units. The blue solid line passes through the points (2023-01, 0), (2023-07, 0.04), (2024-01, 0.2), ending before (2024-07, 0.02). The orange dashed line starts at (2023-01, 0), rises to (2023-03, 0.03), then decreases to (2024-01, negative 0.1), and shows vertical spikes around (2023-07). In the second graph “E 2 - Original versus Isolated”, the vertical axis is labeled “Displacement (millimeters)” and ranges from “negative 0.10” to “0.10” in increments of 0.05 units. The blue solid line passes through the points (2024-01, 0.03), remains near (2024-07, negative 0.05), and ends at (2025-01, negative 0.02). The orange dashed line starts at (2023-07, negative 0.05), then increases to (2024-01, 0.03), and continues toward (2024-07, 0.02), ending near (2025-01, negative 0.10) with visible vertical spikes around (2023-07) and (2024-01). In the third graph “E 3 - Original versus Isolated”, the vertical axis is labeled “Displacement (millimeters)” and ranges from “negative 0.2” to “0.2” in increments of 0.1 units. The blue solid line passes through the points (2023-01, 0), (2023-07, 0.02), (2024-01, 0.2), then drops to (2024-01, negative 0.05), continues to (2024-07, negative 0.08), and rises to (2025-01, 0.2). The orange dashed line starts at (2023-01, 0), increases to (2023-07, 0.05), then decreases to (2024-01, negative 0.10), continues toward (2024-07, negative 0.05), and ends near (2025-01, 0.05), with visible vertical spikes around (2023-07), (2024-01), and (2025-01). In the fourth graph “E 4 - Original versus Isolated”, the vertical axis is labeled “Displacement (millimeters)” and ranges from “negative 0.2” to “0.2” in increments of 0.1 units. The blue solid line passes through the points (2023-01, 0), (2023-07, 0.04), (2024-01, 0.2), then drops to (2024-01, negative 0.05), continues to (2024-07, negative 0.08), and rises to (2025-01, 0.22). The orange dashed line starts at (2023-01, 0), increases to (2023-07, 0.05), then decreases to (2024-01, negative 0.10), continues toward (2024-07, negative 0.05), and ends near (2025-01, 0.05), with visible vertical spikes around (2023-07), (2024-01), and (2025-01). In the bottom row, four scatter plots labeled “E 1 (R squared equals 0.000)”, “E 2 (R squared equals 0.000)”, “E 3 (R squared equals 0.000)”, and “E 4 (R squared equals 0.000)” are arranged side by side. In all plots, the horizontal axis is labeled “Temperature (degree Celsius)” and ranges from “10” to “20” in increments of 10 units. The vertical axis is labeled “Displacement (millimeters)”. Purple scatter points represent observed data, and a horizontal black line is drawn near zero displacement. In “E 1”, the vertical axis ranges from “negative 0.2” to “0.2” in increments of 0.1 units. The scatter points form diagonal bands trending upward from lower left to upper right, indicating increasing displacement with temperature despite the horizontal reference line. In “E 2”, the vertical axis ranges from “negative 0.10” to “0.10” in increments of 0.05 units. The scatter points are densely clustered with a slight upward diagonal pattern, spreading from negative values to positive values as temperature increases. In “E 3”, the vertical axis ranges from “negative 0.2” to “0.2” in increments of 0.1 units. The scatter points form multiple diagonal streaks, showing a strong upward spread from negative displacement at lower temperatures to positive displacement at higher temperatures. In “E 4”, the vertical axis ranges from “negative 0.2” to “0.2” in increments of 0.1 units. The scatter points again form diagonal bands similar to “E 3”, with values increasing as temperature rises. Note: All numerical data values are approximated.Crack isolated displacement (FBG_1 system) over the monitored months