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Dibblee (2002)
Morton & Miller (2006)
Ross (1969); AP Fault Zone (1974)
ApproximatelyLocated
AccuratelyLocated
Concealed
Fault TracesPlate 1a (to FER 251)
Previous fault mapping in the Mescal Creek quadrangle.
MESCAL CREEK
MOUNTSAN ANTONIO
EL MIRAGE
VALY
ERM
O
PHEL
AN
CRYS
TAL L
AKE
TELE
GRAP
H PK1b
1a Dendochronological Dating Sample Sites - Jacoby (1988)
0 1 20.5Km
Morton & Miller (2006)
Ross (1969); AP Fault Zone (1974)
ApproximatelyLocated
AccuratelyLocated
Concealed
Fault Traces
Wrightwood Paleoseismic Site.SAF - San Andreas Fault (based on Trench Data)
Dendochronological Dating Sample Sites - Jacoby (1988)
0 1 20.5Km
Plate 1b (to FER 251)
Previous fault mapping in the Mount San Antonio quadrangle.
MESCAL CREEK
MOUNTSAN ANTONIO
EL MIRAGE
VALY
ERM
O
PHEL
AN
CRYS
TAL L
AKE
TELE
GRAP
H PK1b
1a
Trench
Inset figure from Scharer et al. (2007)
Imagery interpretation of geomorphic features related to recent faulting in the Mescal Creek quadrangle.
Fused imagery (MASTER & LiDAR)Illumination Source:90° & 26° Sun Azimuth45° Sun Elevation
Resolution: 0.5 m
Fault traces related to geomorphic features.
Plate 2a (to FER 251)
scarp modifiedby road
ponded alluvium
linear drainage
tonal lineament ?
vegetation contrast ?in young Qal
broad sidehill bench
vegetation contrast
shutter ridgelinear trough
closed depression,(sag pond)
break in slopeSW-facing scarp
beheadeddrainage
scarp in terrace
right-laterallydeflected drainage
linear trough1857?
right-laterallydeflected drainage
SW-facing scarpmodified by grading
?
?
???
?
right-laterallydeflected drainage
right-laterallydeflected drainage
detoeddrainage
linear ridge
linear drainagemodified by road grade
sidehill bench
break in slope orSW-facing scarp
in bedrock
linear trough or sidehill bench -
ridgetopspreading?
0 1 20.5Km
45°
Interpreted by Bryant & Perez (2007) and Perez & Bryant (this report) from the MASTER/LiDAR imagery.
1b2c2a
2b
3a
1a
3b
4a
4b
4c
5b5a
6
8a
7
8b 10
911a
11c
11e
11b
11d11f
12
21Fault feature number refers to description/attributionas discussed in the “Imagery Interpretation” section of the report.
MESCAL CREEK
MOUNTSAN ANTONIO
EL MIRAGE
VALY
ERM
O
PHEL
AN
CRYS
TAL L
AKE
TELE
GRAP
H PK2b
2a
Plate 2b (to FER 251)
Imagery interpretation of geomorphic features related to recent faulting in the Mount San Antonio quadrangle.
Fused imagery (MASTER & LiDAR)Resolution: 0.5 m
Illumination Source:90° & 26° Sun Azimuth45° Sun Elevation
0 1 20.5Km
linear trough, NE-facing scarp
linear ridge
vogue tonal lineament in Qal
tonal lineament,possible SW-facing scarp on young alluvial fan
possible SW-facing scarp, fluvially modified
tonal lineament,modified NE-facing scarp
vegetation contrastin young alluvial fan
modified NE-facing scarp
vegetation contrastin young Qal
closed depression(sag pond),artificial?
tonal lineament,possible NE-facing scarp in young Qal
closed depression(sag pond)
vegetation contrastin Holocene Qal
right-laterallydeflected drainage
right-laterally deflected streamchannel wall
right-laterallydeflected drainage
possible SW-facing
scarp
right-laterallydeflected drainage
sidehill bench
?
?
?
?
?
?
?
?
?
?
45°
south bound of pressure ridge?
MESCAL CREEK
MOUNTSAN ANTONIO
EL MIRAGE
VALY
ERM
O
PHEL
AN
CRYS
TAL L
AKE
TELE
GRAP
H PK2b
2a
Fault traces related to geomorphic features.
16
14
17a17b
18a19a
20a
20b
13h
13f
13g
18b
19b
13a 15a
15b
13d13b
13e
13c
21Fault feature number refers to description/attributionas discussed in the “Imagery Interpretation” section of the report.
Interpreted by Bryant & Perez (2007) and Perez & Bryant (this report) from the MASTER/LiDAR imagery.
Plate 3a (to FER 251)
Fault traces recommended for inclusion in the revised EFZ of the Mescal Creek 7.5-minute quadrangle.
MESCAL CREEK
MOUNTSAN ANTONIO
EL MIRAGE
VALY
ERM
O
PHEL
AN
CRYS
TAL L
AKE
TELE
GRAP
H PK3b
3aRecommended Alquist-Priolo Earthquake Fault Zone
1974 Alquist-Priolo Earthquake Fault Zone
Faults mapped by Ross (1969) based on photo interpretation of 1966 APs. Approximately
LocatedAccurately
Located Concealed
Fault Traces
These faults will be spatially modified to conform with the more accurately located fault traces of Perez & Bryant.
Inferred
? ?
Area not evaluated
Area not evaluated
0 1 20.5Km
Area outside Imagery Coverage not evaluated
Fault traces Interpreted by Bryant & Perez (2007) and Perez & Bryant (this report) from the MASTER/LiDAR imagery.
Plate 3b (to FER 251)
Fault traces recommended for inclusion in the revised EFZ of the Mount San Antonio 7.5-minute quadrangle.
MESCAL CREEK
MOUNTSAN ANTONIO
EL MIRAGE
VALY
ERM
O
PHEL
AN
CRYS
TAL L
AKE
TELE
GRAP
H PK
0 1 20.5Km
3b
3aRecommended Alquist-Priolo Earthquake Fault Zone
1974 Alquist-Priolo Earthquake Fault Zone
Faults mapped by Ross (1969) based on photo interpretation of 1966 APs. Approximately
LocatedAccurately
Located Concealed
Fault Traces
These faults will be spatially modified to conform with the more accurately located fault traces of Perez & Bryant.
Inferred
Fault traces Interpreted by Bryant & Perez (2007) and Perez & Bryant (this report) from the MASTER/LiDAR imagery.
Area not evaluated
Area not evaluated
Area outside Imagery Coverage not evaluated