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Assembling Geophysical Data to Model Seismic Response in Las Vegas Valley. John G. Anderson & John N. Louie Seismological Lab, UNR May 2003 - May 2005. LVVSR Components @UNR. Model Assembler Enables LLNL to use existing knowledge Adding new data; interoperation and archiving

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assembling geophysical data to model seismic response in las vegas valley

Assembling Geophysical Data to Model Seismic Response in Las Vegas Valley

John G. Anderson & John N. Louie

Seismological Lab, UNR

May 2003 - May 2005

lvvsr components @unr
LVVSR Components @UNR
  • Model Assembler
      • Enables LLNL to use existing knowledge
      • Adding new data; interoperation and archiving
  • E3D sensitivity studies
      • Place facilities and expertise at UNR
      • Guide model assembly
  • Shallow shear-velocity transects
      • Extensive reconnaissance data
  • Outreach
      • Scientific presentations; students’ careers
      • Link with UNLV faculty
      • Community and national efforts
modelassembler
ModelAssembler
  • A code to stitch together existing regional geophysical and geological data sets, into a form useful to E3D.
slide4

Comparison of Regional Basin Estimators

Rogers’s March ‘02 5% topographic gradient result is above. Bedrock is blue and basins are yellow. (Only showing surface velocity.)

Louie’s July ‘02 ModelAssembler 2.0 result is below. Bedrock is red and basins are green-to-blue. (Showing 20-km vertical velocity average.)

The bedrock nature of flat Pahute Mesa is now shown, but some Tertiary sediments like the Funeral Fm. in Death Valley also show as bedrock.

LV

PM

SM

DV

PM

LV

SM

DV

regional basin depths jachens and blakely usgs sedimentary and volcanic derived from basin gravity
Regional Basin DepthsJachens and Blakely, USGSSedimentary and VolcanicDerived from Basin Gravity
modelassembler1
ModelAssembler
  • Uses Rules to project properties.
modelassembler2
ModelAssembler
  • Has existing, and some new, geotechnical measurements by UNLV and UNR.
le r ve lv strip
Le Rêve, LV Strip

SASW courtesy B. Luke, UNLV

Engineering Geophysical Lab.

las vegas springs

Soil profile

Las Vegas Springs

SASW & X-Hole courtesy B. Luke,

UNLV Engineering Geophysical Lab.

modelassembler3
ModelAssembler
  • Leading to projects testing many evaluation methods at critical sites.

Comparison of Dispersion Curves

modelassembler4
Tentative Software Requirements (Features of MA):

Conversion and parallelization of MA completed before Ms. Yan Ha visits LLNL.

1st sequential version, debugging and optimization complete by end of October.

Includeregional geophysical grids and topography in MA.

Complete by end of December 2003.

Develop MA3 into a Public Web Service.

Under discussion with L. Kamb of SCEC/IRIS-DMC.

Assuming Yan Ha visit will be from February to April 2004:

Integrate MA and E3D. Complete initial test runs: 4/28/2004.

ModelAssembler
  • Plans for integration with E3D, use by other LLNL projects, and visualization development:
modelassembler5
Add stochastic geologic/geophysical variability to assembled models.

Complete stochastic method incorporation at end of April 2004.

Complete stochastic-unit rule sets by end of May 2004.

Complete stochastic test runs: 8/15/2004.

Enable blending of embedded grids, morphing, and rule-based transitions between input dataset areas.

Demonstration: 3/1/2004.

Complete improved, reviewed, tested transitions: 6/15/2004.

Add model visualization capability to MA.

Three-dimensional visualizations available by 9/15/2004.

Remove rules from code and allow them to be written plainly.

Completion: 5/31/2004 (after Ms. Ha visit).

Archive MA and all contributing data.

Completion: 9/15/2004.

ModelAssembler
  • More Plans:
modelassembler6
ModelAssembler
  • Amplification map output- a test of MA, or an outreach product?
collaboratory for computational geosciences
4 dual-Athlon nodes funded by LLNL

11 additional dual-Athlon nodes funded by:

Optim LLC

Nevada Applied Research Initiative

Research and education mission

4 lab exercises for grad/senior geophysics course now on line

Collaboratory forComputational Geosciences
e3d sensitivity tests
E3D Sensitivity Tests
  • 2-d elastic graben model computed at CCoG
e3d sensitivity tests1
E3D Sensitivity Tests
  • Spectral-ratio images
slide17

8 sec Period

4 sec Period

slide18

8 sec Period

4 sec Period

slide19

8 sec Period

4 sec Period

shallow shear velocity transects
Shallow Shear-Velocity Transects
  • Using urban ReMi reconnaissance
shallow shear velocity transects1
Shallow Shear-Velocity Transects
  • ReMi measures Rayleigh dispersion with linear refraction arrays.
reno transect
Reno Transect
  • Local reconnaissance was first test.
reno transect1
Reno Transect
  • Unexpected results:
reno transect2
Reno Transect
  • Lack of V30 correlation to maps
shallow shear velocity transects2
Shallow Shear-Velocity Transects
  • Las Vegas route from Cheyenne to Tropicana
las vegas transect
Las Vegas Transect
  • Some correlation to basin depth?
las vegas transect1
Las Vegas Transect
  • No correlation between V30 and geologic map.
las vegas transect2
Las Vegas Transect
  • Correlation with clay soils, caliche in Las Vegas?
las vegas transect3
Las Vegas Transect
  • Shallow section & V100 hint at stratigraphy, faulting?