Low Frequency Site Response: Difference between revisions

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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"
Line 12: Line 16:
| 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
Line 18: Line 22:
| 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
Line 24: Line 28:
| 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
Line 30: Line 34:
| 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
Line 36: Line 40:
| 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
Line 42: Line 46:
| 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
Line 48: Line 52:
| 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
Line 54: Line 58:
| 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
Line 60: Line 64:
| 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
Line 66: Line 70:
| 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
Line 72: Line 76:
| 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
PAS 907.6 687.7 709.1
SBSM 274.5 255.9 285.4
WNGC 292.5 264.5 290.7
LBP 226.2 209.5 248.6
LADT 349.0 334.2 340.8
ALIS 720.7 649.7 664.6
LBUT 719.7 646.5 661.7
ALP 351.9 325.5 352.9
PDE 351.8 333.9 354.8
SMCA 372.0 319.2 332.0

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
SBSM 274.5 255.9 285.4
VER 235.2 306.7 262.7
BKR 293.5 310.1 341.4
W15 351.3 220.3 243.3
LCN 710.1 642.9 658.1
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