of 18
GROUND MOTION
S
IN URBAN LOS ANGELES FROM THE 2019
RIDGECREST EARTHQUAKE SEQUENCE
F. Filippitzis, M. D. Kohler, T. H. Heaton, R. W. Graves, R. W. Clayton, R. G. Guy, J. J. Bunn,
K. M. Chandy
Supplementary Material
Contents:
Supplementary Figures:
Page 2
Supplementary Tables:
Page 1
8
2
Figure S
1
. Los Angeles
-
116th S
treet
School sensor comparison
for
M7.1 Ridgecrest earthquake
(
g
eolog
ical setting
:
Alluvium)
.
CSN network station: CJ.T001250, CE network station: CE.14403.
East
-
West components
.
(A) Acceleration time histories. (B) Acceleration response spectra (2%,
5%, and 10% damping ratio) and residuals. The results are similar for all
three
components.
3
Fig
ure S
2
.
Pseudo
-
spectral acceleration (
SA
)
m
aps. Damping ratio=2%. Left column: M7.1
e
arthquake
. Right column: M6.4
e
arthquake
. (A
-
B) T=1
s. (C
-
D) T=3
s. (E
-
F) T=6
s. (G
-
H) T=8
s. Circles: CSN stations, Diamonds: SCSN &
CSMIP
stations.
The region inside the
black
rectangle is magnified in Figure S3. Note varying
colorbar
amplitude
scales.
4
Figure S
3
.
SA
maps
showing
d
etail
in the region marked by the black rectangle in Figure
S
2
.
Damping ratio=
2
%.
Same format as Figure S
2
.
5
Figure S4. RotD50 maps. Damping ratio=5%. Left column: M7.1
e
arthquake
. Right column: M6.4
earthquake
. (A
-
B) T=1
s. (C
-
D) T=3
s. (E
-
F) T=6
s. (G
-
H) T=8
s. Circles: CSN stations,
Diamonds: SCSN &
CSMIP
stations. The region inside the black rectangle is magn
ified in Figure
S5. Note varying
colorbar
amplitude
scales.
6
Figure S5. RotD50 maps
showing
d
etail
in the region marked by the black rectangle in Figure
S4
.
Damping ratio=
5
%.
Same format as Figure S4.
7
Figure S
6
. SA direction maps
.
Detailed version
of Figure 4
(from the main text)
.
Left column:
M7.1 e
arthquake
. Right column: M6.4 e
arthquake
. (A
-
B) T=1 s. (C
-
D) T=3 s. (E
-
F) T=6 s. (G
-
H)
T=8 s. Damping ratio=5%. Circles: CSN stations, Diamonds: SCSN & CSMIP stations.
8
Figure S7. SA ra
tio maps.
Left column: M7.1 e
arthquake
. Right column: M6.4 e
arthquake
. (A
-
B)
T=1 s. (C
-
D) T=3 s. (E
-
F) T=6 s. (G
-
H) T=8 s. Damping ratio=5%. Circles: CSN stations,
Diamonds: SCSN & CSMIP stations.
9
Figure S
8
.
SA correlation between the two
earthquakes
. (A
) T=1
s. (B) T=3
s. (C) T=6
s. (D) T=8
s. Damping ratio=
5
%. Circles: CSN stations, Diamonds: SCSN &
CSMIP
stations. The colormap
displays the
depth
-
to
-
basement
at each station.
10
Figure S
9
.
SA correlation with depth
-
to
-
basement
,
for the M7.1
earthquake
. (
A) T=1
s. (B) T=3
s.
(C) T=6
s. (D) T=8
s
.
Damping ratio=5%. Circles: CSN stations, Diamonds: SCSN &
CSMIP
stations.
11
Figure S
10
.
SA correlation with
Ss30
, for the M7.1
earthquake
. (A) T=1
s. (B) T=3
s. (C) T=6
s.
(D) T=8
s. Damping ratio=5%.
Circles: CSN stations, Diamonds: SCSN &
CSMIP
stations.
12
Figure S1
1
.
SA correlation with
Z1.0 (from the CVM
-
S
velocity
model)
for the M7.1 e
arthquake
logarithmic scale
. (A) T=1
s. (B) T=3
s. (C) T=6
s. (D) T=8
s
.
Damping ratio=5%.
Circles: CSN
stations, Diamonds: SCSN &
CSMIP
stations.
The s
olid line
shows the least
-
squares (LS)
regression fit
performed in log
-
log scale
.
The slope and intercept of the LS regression line
,
and the
standard deviation
of the log values
are provided in e
ach subplot.
13
Figure S1
2
.
SA correlation with
Z1.0 (from the CVM
-
H
velocity
model)
for the M7.1 e
arthquake
logarithmic scale
. (A) T=1
s. (B) T=3
s. (C) T=6
s. (D) T=8
s
.
Damping ratio=5%. Circles: CSN
stations, Diamonds: SCSN &
CSMIP
stations.
The s
olid line
shows the least
-
squares (LS)
regression fit
performed in log
-
log scale
.
The slope and intercept of the LS regression line
,
and the
standard deviation
of the log values
are provided in each subplot.
14
Figure S1
3
.
SA correlation with
Z2.5 (from the CVM
-
S
velocity
model)
for the M7.1 e
arthquake
logarithmic scale
. (A) T=1
s. (B) T=3
s. (C) T=6
s. (D) T=8
s
.
Damping ratio=5%. Circles: CSN
stations, Diamonds: SCSN &
CSMIP
stations.
The s
olid line
shows the least
-
squares (LS)
regression fit
performed in log
-
log scale
.
The slope and intercept of the LS regression line
,
and the
standard deviation
of the log values
are provided in each subplot.
15
Figure S1
4
.
SA correlation with
Z2.5 (from the CVM
-
S
velocity
model)
for the M7.1 e
arthquake
logarithmic scale
. (A) T=1
s. (B) T=3
s. (C) T=6
s. (D) T=8
s
.
Damping ratio=5%. C
ircles: CSN
stations, Diamonds: SCSN &
CSMIP
stations.
The s
olid line
shows the least
-
squares (LS)
regression fit
performed in log
-
log scale
.
The slope and intercept of the LS regression line
,
and the
standard deviation
of the log values
are provided in ea
ch subplot.
16
Figure S
1
5
.
M
aps
of the residuals
, calculated according to
Eq. (
3
)
,
between model
-
predicted
(simulations) and data
RotD50
for the M7.1 e
arthquake
.
The
selected
model
s
and
period
s
are
shown in
the top
right
corner of
each subplot.
The
resulting absolute misfit
(
)
, calculated
according to Eq. (6)
,
is also
indicat
ed
in
the top
right
corner of
each subplot
.
The
colorbar is the
same for all subplots and
its range
was limited to [
-
1.2, 2.2] in order to better capture the
near
-
zero
overprediction/underprediction variations.
17
Figure S
1
6
.
M
aps
of the residuals
, calculated according to Eq. (3),
between model
-
predicted
(GMPE) and data
RotD50
for the M7.1 e
arthquake
.
The
selected
GMPE name
s
and period
s
are
shown in
the top
right
corner
of
each subplot.
The resulting absolute misfit
(
)
, calculated
according to Eq. (6)
,
is also
indicated in
the top
right
corner of
each subplot
. The colorbar is the
same for all subplots and its range was limited to [
-
1.2, 2.2] in order to better
capture the near
-
zero
overprediction/underprediction variations.