Testing UCVM Vs Values

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Summary of testing low Vs values returned by UCVM for some velocity models when Ely GTL is applied


Relationship between UCVM Vs30 for point and Vs returned by Ely GTL

Vs30 187.832 Vs 93.916
ratio Vs/Vs30 0.5

Vs30 228.200 Vs 114.100
ratio Vs/Vs30 0.5

Vs30 180.000 Vs 90.000
ratio Vs/Vs30 0.5

Vs30 228.200 Vs 114.100
ratio Vs/Vs30 0.5

Vs30 238.467 Vs 119.234
ratio Vs/Vs30 0.5000020967261717

Vs30 213.306 Vs 106.653
ratio Vs/Vs30 0.5

Vs30 228.200 Vs 114.100
ratio Vs/Vs30 0.5

Test Impact of Z range of ElyGTL

Tests below show no impact on surface Vs by extending the Z range

-bash-4.2$ ./bin/ucvm_query -f ./conf/ucvm.conf -c gd -m cvms5,elygtl:ely -z 0,350 < file.in Using Geo Depth coordinates as z mode.

-115.1000    32.6000      0.000     20.000    187.832      cvms5   2250.415   1178.551   2172.060     elygtl      0.000    187.832      0.000        ely    653.574     93.916   1000.000
-115.6000    32.8000      0.000     -9.985    228.200      cvms5   2000.182   1059.580   2127.748     elygtl      0.000    228.200      0.000        ely    689.649    114.100   1000.000
-115.7800    33.2000      0.000    -70.960    180.000      cvms5   1955.449   1002.836   2103.969     elygtl      0.000    180.000      0.000        ely    646.448     90.000   1000.000
-118.1000    33.8000      0.000      5.077    228.200      cvms5   1769.035    910.839   2061.457     elygtl      0.000    228.200      0.000        ely    689.649    114.100   1000.000
-118.0000    34.8000      0.000    704.403    238.467      cvms5   3036.981   1859.951   2324.091     elygtl      0.000    238.467      0.000        ely    698.655    119.234   1000.000
-116.5200    36.5000      0.000    701.274    213.306      cvms5   5214.103   2999.543   2527.909     elygtl      0.000    213.306      0.000        ely    676.464    106.653   1000.000
-119.5000    36.0000      0.000     61.622    228.200      cvms5   3794.050   2052.842   2350.708     elygtl      0.000    228.200      0.000        ely    689.649    114.100   1000.000


-bash-4.2$ ./bin/ucvm_query -f ./conf/ucvm.conf -c gd -m cvms5,elygtl:ely -z 0,1000 < file.in

-115.1000    32.6000      0.000     20.000    187.832      cvms5   2590.639   1347.202   2223.546     elygtl      0.000    187.832      0.000        ely    653.574     93.916   1000.000
-115.6000    32.8000      0.000     -9.985    228.200      cvms5   2266.979   1222.258   2186.597     elygtl      0.000    228.200      0.000        ely    689.649    114.100   1000.000
-115.7800    33.2000      0.000    -70.960    180.000      cvms5   2221.783   1226.802   2188.058     elygtl      0.000    180.000      0.000        ely    646.448     90.000   1000.000
-118.1000    33.8000      0.000      5.077    228.200      cvms5   2195.387   1144.858   2160.235     elygtl      0.000    228.200      0.000        ely    689.649    114.100   1000.000
-118.0000    34.8000      0.000    704.403    238.467      cvms5   3313.720   2070.858   2353.114     elygtl      0.000    238.467      0.000        ely    698.655    119.234   1000.000
-116.5200    36.5000      0.000    701.274    213.306      cvms5   5239.446   3017.712   2533.212     elygtl      0.000    213.306      0.000        ely    676.464    106.653   1000.000
-119.5000    36.0000      0.000     61.622    228.200      cvms5   3913.290   2088.075   2355.411     elygtl      0.000    228.200      0.000        ely    689.649    114.100   1000.000

However, adding the elyGTL without specifying a z range has significant impact:

-bash-4.2$ ./bin/ucvm_query -f ./conf/ucvm.conf -c gd -m cvms5,elygtl:ely < file.in Using Geo Depth coordinates as z mode.

-115.1000    32.6000      0.000     20.000    187.832      cvms5   2117.109   1106.877   2146.231       none      0.000      0.000      0.000      crust   2117.109   1106.877   2146.231
-115.6000    32.8000      0.000     -9.985    228.200      cvms5   1894.677   1001.519   2103.395       none      0.000      0.000      0.000      crust   1894.677   1001.519   2103.395
-115.7800    33.2000      0.000    -70.960    180.000      cvms5   1831.621    938.975   2074.998       none      0.000      0.000      0.000      crust   1831.621    938.975   2074.998
-118.1000    33.8000      0.000      5.077    228.200      cvms5   1605.554    834.269   2022.078       none      0.000      0.000      0.000      crust   1605.554    834.269   2022.078
-118.0000    34.8000      0.000    704.403    238.467      cvms5   3034.279   1858.337   2323.856       none      0.000      0.000      0.000      crust   3034.279   1858.337   2323.856
-116.5200    36.5000      0.000    701.274    213.306      cvms5   5212.431   2999.594   2527.924       none      0.000      0.000      0.000      crust   5212.431   2999.594   2527.924
-119.5000    36.0000      0.000     61.622    228.200      cvms5   3763.020   2030.096   2347.663       none      0.000      0.000      0.000      crust   3763.020   2030.096   2347.663

Low Vs Test Points

Low Vs values are found for the following points from CVM-S4.26 using elygtl.

lon, lat, Vs(m/s)
A: -115.1   32.6   93.916
B: -115.6   32.8   114.1
C: -115.78 33.2   90.0
D: -118.1   33.8   114.1
E: -118.0   34.8   119.234
F: -116.52 36.5   106.563
G: -119.5   36.0   114.1


Map of Low Vs Values from UCVM

This map shows Vs values for CVMS+elygtl (cvms5,elygtl:ely -z 0,1000).

Fig slice vs 00km.png
Locations.png

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