Electronic Supplement to
Holocene Behavior of the Brigham City Segment: Implications for Forecasting the Next Large-Magnitude Earthquake on the Wasatch Fault Zone, Utah

by Stephen F. Personius, Christopher B. DuRoss, and Anthony J. Crone

Table S2. Data and Sources of Surface-offset Measurements for Figures 4b and 8

Profile Number / Site Name Profile Attached1 Distance2
(km)
Surface Offset3
(m)
Uncertainty
(~2σ)
Map Unit4 Comments
Data for Figure 4b
Kaysville trench site -35.6 1.8 0.2 af2 from McCalpin et al. (1994)
East Ogden trench site -10.7 2.6 0.3 af1 from Nelson et al. (2006)
Rice Creek trench site -2.5 3.2 0.5 af2 from DuRoss et al. (2009)
P5 3.0 1.1 0.1 af1 from DuRoss et al. (2012)
P2, P3 3.3 1.8 0.1 af1 ave. of P2 (1.7 m) and P3 (1.9 m)
Pearsons Canyon trench site 4.3 0.8 0.2 af1
SP-13 yes 6.6 1.4 0.1 af1 northernmost scarp in af1 deposits
Data for Figure 8
published measurement -5.2 19.0 1.9 lpg from Nelson and Personius (1993)
published measurement -4.0 19.0 1.9 afp
published measurement -0.7 5.5 0.6 afb probable maximum
Southern segment boundary 0.0
TPBCS-29 yes 2.5 8.3 0.8 afb probable maximum
TPBCS-28 yes 2.9 7.7 0.8 afb probable maximum
TPBCS-26 yes 3.5 18.3 1.8 lpg/lbpg
TPBCS-22 yes 4.1 19.5 2.0 afp
SP85-3 + SP-4 yes 5.0 21.0 2.1 afp SP 85-3: 18.35 m + SP85-4: 2.70 m
TPBCS-18 yes 5.6 18.6 1.9 lbpg/afp
TPBCS-15 yes 7.1 18.5 1.8 lpg/lbpg total across 3 scarps
SP85-12 yes 8.1 28.1 2.7 lbd maximum; graben across Willard delta
TPBCS-11 yes 10.7 17.3 1.7 lbpg
SP85-14 yes 18.0 21.2 2.1 lpd single scarp across Box Elder delta
SP-10 + SP10b yes 21.6 18.1 1.8 lbpg/lbpm SP-10a: 15.78 m + SP-10b: 2.3 m
SP-20 yes 26.4 9.4 0.9 lbpg
SP-19 yes 26.9 11.9 1.2 afp total across 2 scarps
SP-21 + SP-22 yes 29.6 8.4 0.8 afp/lbpg SP-21: 4.81 m + SP-22: 3.61 m
Calls Fort exp. 31.2 4.2 0.4 lpg minimum; from gravel pit exposures
TPBCS-04e yes 32.6 5.7 0.6 lpg
SP-18 yes 34.8 3.8 0.4 afp
Northern segment boundary 36.0
TPBCS-03 yes 39.1 2.0 0.2 afp
TPBCS-02 yes 39.2 2.0 0.2 afp

1“Yes” denotes profiles included in Figure S3.

2Straight-line distance from southern boundary of BCS. 

3As defined by Bucknam and Anderson (1979); equivalent to vertical separation and fault throw. 

4Offset geologic map unit, from Personius (1990) and Nelson and Personius (1993); af1—late Holocene fan alluvium; af2—middle Holocene fan alluvium; afb—fan alluvium related to the Bonneville shoreline; afp—fan alluvium related to the Provo shoreline; lbd—deltaic deposits related to the Bonneville shoreline; lbpg—lacustrine sand and gravel related to the Provo and Bonneville shorelines; lbpm—lacustrine silt and clay related to the Provo and Bonneville shorelines; lpd—deltaic deposits related to the Provo shoreline; lpg—lacustrine sand and gravel related to the Provo shoreline.

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