Difference between revisions of "Low Frequency Site Response"

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== Study 22.12 comparisons ==
 
== Study 22.12 comparisons ==
  
−
Below are scatterplots comparing Study 22.12 low-frequency and Study 22.12 broadband results, at periods of 2-10 sec. Since the Study 22.12 LF results don't include site response and the broadband results do, this provides a way for us to examine the impact of the site response.
+
Below are RotD50 scatterplots comparing Study 22.12 low-frequency and Study 22.12 broadband results, at periods of 2-10 sec. Since the Study 22.12 LF results don't include site response and the broadband results do, this provides a way for us to examine the impact of the site response.
 +
 
 +
If Vs30 < Vref, then ground motion is increased; otherwise, the ground motion is decreased.
 +
 
 +
(Note that the units are wrong; these plots are actually cm/s2.)
  
 
{| border="1" cellpadding="5"
 
{| border="1" cellpadding="5"
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| 295.7
 
| 295.7
 
| 320.5
 
| 320.5
−
| [[File:USC_site_response_lf_v_bb.png|thumb|600px]]
+
| [[File:USC_site_response_lf_v_bb.png|thumb|500px]]
 
|-
 
|-
 
! PAS
 
! PAS
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| 687.7
 
| 687.7
 
| 709.1
 
| 709.1
−
| [[File:PAS_site_response_lf_v_bb.png|thumb|600px]]
+
| [[File:PAS_site_response_lf_v_bb.png|thumb|500px]]
 
|-
 
|-
 
! SBSM
 
! SBSM
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| 255.9
 
| 255.9
 
| 285.4
 
| 285.4
−
| [[File:SBSM_site_response_lf_v_bb.png|thumb|600px]]
+
| [[File:SBSM_site_response_lf_v_bb.png|thumb|500px]]
 
|-
 
|-
 
! WNGC
 
! WNGC
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| 264.5
 
| 264.5
 
| 290.7
 
| 290.7
−
| [[File:WNGC_site_response_lf_v_bb.png|thumb|600px]]
+
| [[File:WNGC_site_response_lf_v_bb.png|thumb|500px]]
 
|-
 
|-
 
! LBP
 
! LBP
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| 209.5
 
| 209.5
 
| 248.6
 
| 248.6
−
| [[File:LBP_site_response_lf_v_bb.png|thumb|600px]]
+
| [[File:LBP_site_response_lf_v_bb.png|thumb|500px]]
 
|-
 
|-
 
! LADT
 
! LADT
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| 334.2
 
| 334.2
 
| 340.8
 
| 340.8
−
| [[File:LADT_site_response_lf_v_bb.png|thumb|600px]]
+
| [[File:LADT_site_response_lf_v_bb.png|thumb|500px]]
 
|-
 
|-
 
! ALIS
 
! ALIS
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| 649.7
 
| 649.7
 
| 664.6
 
| 664.6
−
| [[File:ALIS_site_response_lf_v_bb.png|thumb|600px]]
+
| [[File:ALIS_site_response_lf_v_bb.png|thumb|500px]]
 
|-
 
|-
 
! LBUT
 
! LBUT
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| 646.5
 
| 646.5
 
| 661.7
 
| 661.7
−
| [[File:LBUT_site_response_lf_v_bb.png|thumb|600px]]
+
| [[File:LBUT_site_response_lf_v_bb.png|thumb|500px]]
 
|-
 
|-
 
! ALP
 
! ALP
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| 325.5
 
| 325.5
 
| 352.9
 
| 352.9
−
| [[File:ALP_site_response_lf_v_bb.png|thumb|600px]]
+
| [[File:ALP_site_response_lf_v_bb.png|thumb|500px]]
 
|-
 
|-
 
! PDE
 
! PDE
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| 333.9
 
| 333.9
 
| 354.8
 
| 354.8
−
| [[File:PDE_site_response_lf_v_bb.png|thumb|600px]]
+
| [[File:PDE_site_response_lf_v_bb.png|thumb|500px]]
 
|-
 
|-
 
! SMCA
 
! SMCA
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| 319.2
 
| 319.2
 
| 332.0
 
| 332.0
−
| [[File:SMCA_site_response_lf_v_bb.png|thumb|600px]]
+
| [[File:SMCA_site_response_lf_v_bb.png|thumb|500px]]
 +
|}
 +
 
 +
== Landers multi-segment validation comparisons ==
 +
 
 +
Below are scatter plots comparing low frequency and broadband CyberShake results for the BBP Landers validation event, as well as results for a few selected sites.
 +
 
 +
{| border="1"
 +
! Site !! Thompson Vs30 !! CVM-S4.26.M01 + taper Vs30 !! Vref !! Scatterplot
 +
|-
 +
! Aggregate
 +
|
 +
|
 +
|
 +
| [[File:all_site_response_landers_lf_v_bb.png|thumb|500px]]
 +
|-
 +
! SBSM
 +
| 274.5
 +
| 255.9
 +
| 285.4
 +
| [[File:SBSM_site_response_landers_lf_v_bb.png|thumb|500px]]
 +
|-
 +
! VER
 +
| 235.2
 +
| 306.7
 +
| 262.7
 +
| [[File:VER_site_response_landers_lf_v_bb.png|thumb|500px]]
 +
|-
 +
! BKR
 +
| 293.5
 +
| 310.1
 +
| 341.4
 +
| [[File:BKR_site_response_landers_lf_v_bb.png|thumb|500px]]
 +
|-
 +
! W15
 +
| 351.3
 +
| 220.3
 +
| 243.3
 +
| [[File:W15_site_response_landers_lf_v_bb.png|thumb|500px]]
 +
|-
 +
! LCN
 +
| 710.1
 +
| 642.9
 +
| 658.1
 +
| [[File:LCN_site_response_landers_lf_v_bb.png|thumb|500px]]
 +
|-
 
|}
 
|}

Latest revision as of 20:53, 13 March 2024

This page documents our analysis of the impact of the low frequency site response, as applied to deterministic seismograms as part of the broadband simulation process.

Study 22.12 comparisons

Below are RotD50 scatterplots comparing Study 22.12 low-frequency and Study 22.12 broadband results, at periods of 2-10 sec. Since the Study 22.12 LF results don't include site response and the broadband results do, this provides a way for us to examine the impact of the site response.

If Vs30 < Vref, then ground motion is increased; otherwise, the ground motion is decreased.

(Note that the units are wrong; these plots are actually cm/s2.)

Site Thompson Vs30 CVM-S4.26.M01 + taper Vs30 Vref Scatterplot
USC 336.4 295.7 320.5
USC site response lf v bb.png
PAS 907.6 687.7 709.1
PAS site response lf v bb.png
SBSM 274.5 255.9 285.4
SBSM site response lf v bb.png
WNGC 292.5 264.5 290.7
WNGC site response lf v bb.png
LBP 226.2 209.5 248.6
LBP site response lf v bb.png
LADT 349.0 334.2 340.8
LADT site response lf v bb.png
ALIS 720.7 649.7 664.6
ALIS site response lf v bb.png
LBUT 719.7 646.5 661.7
LBUT site response lf v bb.png
ALP 351.9 325.5 352.9
ALP site response lf v bb.png
PDE 351.8 333.9 354.8
PDE site response lf v bb.png
SMCA 372.0 319.2 332.0
SMCA site response lf v bb.png

Landers multi-segment validation comparisons

Below are scatter plots comparing low frequency and broadband CyberShake results for the BBP Landers validation event, as well as results for a few selected sites.

Site Thompson Vs30 CVM-S4.26.M01 + taper Vs30 Vref Scatterplot
Aggregate
All site response landers lf v bb.png
SBSM 274.5 255.9 285.4
SBSM site response landers lf v bb.png
VER 235.2 306.7 262.7
VER site response landers lf v bb.png
BKR 293.5 310.1 341.4
BKR site response landers lf v bb.png
W15 351.3 220.3 243.3
W15 site response landers lf v bb.png
LCN 710.1 642.9 658.1
LCN site response landers lf v bb.png
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