2D surface strain calculated after removal of UTM reference frame (alternative)
Dates
Publication Date
2020-08-17
Time Period
2014
Time Period
2019
Citation
Barnhart, W.D., Gold, R.D., and Hollingsworth, J., 2020, Displacement and strain field from the 2019 Ridgecrest earthquakes derived from analysis of WorldView optical satellite imagery (ver. 2.0, May 2021): U.S. Geological Survey data release, https://doi.org/10.5066/P9QRZ6NR.
Summary
Summary: This directory contains a second version of the mosaics of the 2-dimensional (2D) surface strain fields of the 2019 Mw7.1 and Mw6.4 Ridgecrest earthquakes derived from optical correlation. These results are derived through a modification to the inversion approach described in Barnhart et al. 2020 (Nature Geoscience) wherein we remove the UTM reference frame when building the Green’s function that is incorporated into the inversion for the displacement gradient tensor. The removal of the reference frame has the effect of improving the condition number of the Green’s function and making the inversion more stable. The mosaics are in UTM Zone 11N coordinates with 10m spatial resolution. Each file is in units of strain (i.e., to [...]
Summary
Summary: This directory contains a second version of the mosaics of the 2-dimensional (2D) surface strain fields of the 2019 Mw7.1 and Mw6.4 Ridgecrest earthquakes derived from optical correlation. These results are derived through a modification to the inversion approach described in Barnhart et al. 2020 (Nature Geoscience) wherein we remove the UTM reference frame when building the Green’s function that is incorporated into the inversion for the displacement gradient tensor. The removal of the reference frame has the effect of improving the condition number of the Green’s function and making the inversion more stable. The mosaics are in UTM Zone 11N coordinates with 10m spatial resolution. Each file is in units of strain (i.e., to plot the strain fields with a color limit of +/- 1% strain, restrict the colorbar to -0.01 and 0.01. Note that this will cause the color scale to saturate). Users who wish to cite these strain fields or understand how they were derived should consult the associated publication.