Calculation of the Best-Fit Homogeneous Strain From a Displacement Field Using Displacement Stretch Plot and Strain Probe Theory

Penetrative Strain and Partitioning of Convergence‐Related Shallow Crustal Shortening, Across Scales, in the Lesser‐ and Sub‐Himalayan Thrusts: Insights From the Eastern Himalaya, Sikkim

“…Therefore, the horizontal line in the image indicates horizontal in the physical space. We traced ∼80-120 deformed quartz grains per thin-section, calculated the axial ratio and long-axis orientation of the deformed ellipses with respect to the horizontal line using the NIS-Elements D4.00.03 and EllipseFit 3.8.0 software (Vollmer, 2010(Vollmer, , 2011a(Vollmer, , 2011b(Vollmer, , 2017(Vollmer, , 2019. We estimated quartz plastic strain (dislocation glide and dislocation climb) from the studied rocks and avoided grains exhibiting truncated boundaries and high fracturing.…”

“…We estimated quartz plastic strain (dislocation glide and dislocation climb) from the studied rocks and avoided grains exhibiting truncated boundaries and high fracturing. We calculated best-fit strain ellipse parameters, that is, R s and long-axis orientation (ϕ), measured with respect to the horizontal line, using the shape matrix eigenvector method (Shimamoto & Ikeda, 1976) embedded in the EllipseFit 3.8.0 software (Vollmer, 2010(Vollmer, , 2011a(Vollmer, , 2011b(Vollmer, , 2017(Vollmer, , 2019. To determine the goodness of the best-fit strain ellipse parameters, 2σ (95%) uncertainties were calculated using the bootstrap technique by resampling 5,000 times (Tables S1 and S2).…”