Electronic Supplement to
Geodetic Observations of Active Intraplate Crustal Deformation in the Wabash Valley Seismic Zone and the Southern Illinois Basin
by Gerald A. Galgana and Michael W. Hamburger
Table S2. Principal strain rates from inversions of internally deforming blocks
Single Block
| Block | E1 | s(E1) | E2 | s(E2) | Az E1 | s(AzE1) | Az E2 | s(Az E2) |
| WABZ | -1.40 | 0.68 | 1.58 | 0.55 | -55.23 | 10.71 | 34.77 | 10.71 |
Multiple Blocks
| Block | E1 | s(E1) | E2 | s(E2) | Az E1 | s(AzE1) | Az E2 | s(Az E2) |
| WWAB | -2.61 | 3.43 | 3.67 | 5.32 | -50.60 | 13.46 | 39.40 | 13.46 |
| NCWA | -2.36 | 2.68 | 3.42 | 2.33 | -67.85 | 24.18 | 22.15 | 24.18 |
| SCWA | -3.14 | 2.36 | 2.04 | 2.28 | -83.31 | 15.68 | 6.69 | 15.68 |
| NEWA | 0.73 | 2.61 | 4.26 | 3.11 | -124.89 | 8.34 | -34.89 | 8.34 |
| SEWA | 1.24 | 2.96 | 2.46 | 3.73 | -7.61 | 24.59 | 82.39 | 24.59 |
| CNMZ | -4.66 | 7.67 | 11.23 | 5.91 | 24.09 | 18.41 | 114.09 | 18.41 |
2-Block System
| Block | E1 | s(E1) | E2 | s(E2) | Az E1 | s(AzE1) | Az E2 | s(Az E2) |
| WWAB | -3.03 | 0.72 | 0.99 | 0.60 | -77.88 | 6.29 | 12.12 | 6.29 |
| EWAB | 1.13 | 0.85 | 4.71 | 0.96 | 31.52 | 10.31 | 121.52 | 10.31 |
4-Block System
| Block | E1 | s(E1) | E2 | s(E2) | Az E1 | s(AzE1) | Az E2 | s(Az E2) |
| ILLI | -2.07 | 1.16 | 1.34 | 1.18 | -57.42 | 21.46 | 32.58 | 21.46 |
| INDY | 0.69 | 1.42 | 4.50 | 1.42 | 13.67 | 29.16 | 103.67 | 29.16 |
| KTKY | 1.27 | 1.95 | 4.97 | 1.86 | -99.22 | 22.65 | -9.22 | 22.65 |
| MISO | -11.59 | 6.77 | 1.12 | 7.94 | -73.69 | 18.24 | 16.31 | 18.24 |
Notes
Sign Convention and Units used
Compression (-); Extension (+)
Principle compressional axis (E1) and principal extensional Axis (E2) units are in ns/yr;
Azimuth (Az) and Azimuth sigma (s(Az)) are both measured in degrees, (+) clockwise from north
Abbreviatons/Codes
Single-Block:
WABZ = Wabash Valley Seismic Zone block
Multiple Block:
WWAB = Western Wabash Valley (Seismic Zone) block
NCWAB = North-Central Wabash Valley block
SCWA = South-Central Wabash Valley block
NEWA = Northeastern Wabash Valley block
SEWA = Southeastern Wabash Valley block
CNMZ = Central New Madrid Seismic Zone block
2-Block System:
WWAB = Western Wabash Valley (Seismic Zone) block
EWAB = Eastern Wabash Valley block
4-Block System:
ILLI = Illinois block or NW block
INDY = Indiana block or NE block
KTKY = Kentucky block or SE block
MISO = Missouri block or SW block
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