[CIG-SEISMO] Vs30 additon to sw4 input

[John Louie]

Dear Metin,
If you have lat, lon, Vs30 values, you could use one block command per
interpolated Vs30 point to insert a surface block of some small size
for each Vs30 value.
I have not tried this myself. I use a system that I call the
ModelAssembler Community Modeling Environment to construct complex 3d
models from geologic basin-thickness and Vs30 data sets. An old
version is at crack.seismo.unr.edu/ma . To use MA with SW4, you need
version 6, that I can send you if you're interested. It is not posted
because it is incomplete with little documentation, requiring changes
to input files by hand.
In all cases, you need to time-average the Vs30 with the shear
velocity average to the depth of your surface zone.
This is the strategy used in:
Brady A. Flinchum, John N. Louie, Kenneth D. Smith, William H. Savran,
Satish K. Pullammanappallil, and Aasha Pancha, 2014, Validating Nevada
ShakeZoning predictions of Las Vegas basin response against 1992
Little Skull Mtn. earthquake records: Bulletin of the Seismological
Society of America, 104, no. 1 (Feb.), 439-450; first published online
January 21; doi: 10.1785/0120130059.
Regards,
John Louie
On Wed, Nov 7, 2018 at 12:01 PM Metin Kahraman
<metin.kahraman at boun.edu.tr> wrote:
>
> Hi all,
>
> I am Metin Kahraman, postdoc researcher at Dept. of Earthquake
> Engineering, Bogazici University Kandilli Observatory and Earthquake
> Research Institute.
>
> I compiled sw4 to my computer and give run to test runs in examples,
> so I am very new and at the beginning. I read the manual.
>
> The problem I am having right now is I am a bit mixed about how to
> Vs30 data into my input file ? because I have interpolated Vs30 for
> the region and not sure how to add this data top of the velocity
> structure that we are defining with blok command in sw4?
>
> Do you have any idea about how add the Vs30 into input?
>
> best wishes,
>
> Metin
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