j. louie and l. preston nevada seismological laboratory s. larsen

J. Louie, GBCVM WorkshopJ. Louie, GBCVM Workshop1/14/20081/14/2008

The Model Assembler Community The Model Assembler Community Modeling Environment and Initial Modeling Environment and Initial Ground-Motion Computations for Ground-Motion Computations for

Reno and Las VegasReno and Las Vegas

J. Louie J. Louie andand L. Preston L. PrestonNevada Seismological LaboratoryNevada Seismological Laboratory

S. LarsenS. LarsenLawrence Livermore National LaboratoryLawrence Livermore National Laboratory

Liz Lenox, Rei Arai, Liz Lenox, Rei Arai, andand Amr Wakwak Amr WakwakDept. Geological Sciences and Engineering, UNRDept. Geological Sciences and Engineering, UNR


A code to stitch A code to stitch together existing together existing regional regional geophysical and geophysical and geological data geological data sets.sets.

Generates multi-Generates multi-gigabyte E3D gigabyte E3D input grids.input grids.

ModelModelAssemblerAssembler


The ModelAssembler Community The ModelAssembler Community Modeling Environment (MA-CME)Modeling Environment (MA-CME)

Graphical user interface for setting up MA/E3D “.in” files.Graphical user interface for setting up MA/E3D “.in” files. Provides tutorial help to successful setup.Provides tutorial help to successful setup. Data sets, stations, grids all defined with geographic Data sets, stations, grids all defined with geographic

lat/lon lat/lon (have to decide on WGS84, NAD27, etc.).(have to decide on WGS84, NAD27, etc.).

Easy configuration of problems at all scales and Easy configuration of problems at all scales and computational difficulties- 10 Mb to 100 Gb.computational difficulties- 10 Mb to 100 Gb.

After setup, “portal pack” is downloaded to cluster and After setup, “portal pack” is downloaded to cluster and run.run.

Open source: Open source: www.seismo.unr.edu/mawww.seismo.unr.edu/ma Limits:Limits: flat earth; no topography; 1-D variations within flat earth; no topography; 1-D variations within

basins & bedrock; source and stations in same grid.basins & bedrock; source and stations in same grid.


MA-CME provides a tutorial GUI to E3DMA-CME provides a tutorial GUI to E3DSet up a Grid:Set up a Grid:


Define Earthquake SourceDefine Earthquake Source


Arrange Basin-Thickness (& Geotech) InputsArrange Basin-Thickness (& Geotech) Inputs


Basins in the B&RBasins in the B&R

Four datasets, not well stitched Four datasets, not well stitched

together:together:

1)1) Geologic map with basin Geologic map with basin

depths assumed from bedrock depths assumed from bedrock

proximity, in California.proximity, in California.

2)2) Jachens et al. USGS basin Jachens et al. USGS basin

gravity inversions for Basin & gravity inversions for Basin &

Range; sedimentary plus Range; sedimentary plus

Tertiary volcanic basins.Tertiary volcanic basins.

3)3) Abbott & Louie (2000) Reno Abbott & Louie (2000) Reno

basin gravity study.basin gravity study.

4)4) Langenheim et al. Las Langenheim et al. Las

Vegas model from gravity, Vegas model from gravity,

refraction, a few deep wells.refraction, a few deep wells.


Request Output DataRequest Output Data


Three Nevada ScenariosThree Nevada ScenariosThree Nevada ScenariosThree Nevada Scenarios

RenoReno

Las VegasLas Vegas

1) Genoa FZ M7.51) Genoa FZ M7.5

3) Furnace Cr FZ M7.53) Furnace Cr FZ M7.5 2) Frenchman M5.02) Frenchman M5.0


Genoa – Mount Rose Genoa – Mount Rose Scenario:Scenario:

MA-CME adds MA-CME adds Geotech & BasinsGeotech & Basins

Three datasets, not well stitched Three datasets, not well stitched together around Reno or at Calif. together around Reno or at Calif. Border.Border.


Genoa – Mount Genoa – Mount Rose Scenario:Rose Scenario:MA-CME adds MA-CME adds

Geotech & BasinsGeotech & BasinsScott et al. (2004) Vs30 Scott et al. (2004) Vs30 transect.transect.

Pancha measurements at Pancha measurements at ANSS stations. ANSS stations.

““Quadrant” interpolation Quadrant” interpolation between scattered between scattered measurements, respecting measurements, respecting geologic map.geologic map.

Vs30=500 m/s assumed Vs30=500 m/s assumed on sediment, 760 m/s on sediment, 760 m/s (white and cyan) on rock.(white and cyan) on rock.


Genoa Fault – Mount Rose Fault SystemsGenoa Fault – Mount Rose Fault Systems

Dataset mismatches Dataset mismatches plain in model plain in model renderings.renderings.

Extreme directivity Extreme directivity effect.effect.

E3D computation at E3D computation at 0.3 Hz on a 0.3 Hz on a 120x200 grid with 120x200 grid with dh=500 m.dh=500 m.

Olsen and Day Q Olsen and Day Q model included.model included.

QuickTime™ and aPhoto - JPEG decompressor

are needed to see this picture.


Genoa Fault – Genoa Fault – Mount Rose Fault Mount Rose Fault

SystemsSystems

West Reno basin, above end of West Reno basin, above end of rupture, has 5x the PGV of any other rupture, has 5x the PGV of any other basin near fault.basin near fault.

Highest shaking not correlated with Highest shaking not correlated with basin depth- Tahoe artificially deep basin depth- Tahoe artificially deep in this model.in this model.

Dataset boundaries not interfering Dataset boundaries not interfering with these conclusions.with these conclusions.


Frenchman Mountain FaultFrenchman Mountain Fault

Langenheim et Langenheim et al. model from al. model from gravity, gravity, refraction, a few refraction, a few deep wells.deep wells.



Scott et al. (2006) Scott et al. (2006) Vs30 model from Vs30 model from 1100+ wells, 79 1100+ wells, 79 Vs profiles. Vs profiles.

Thanks to W. Thanks to W. Taylor of UNLV & Taylor of UNLV & G. Wagoner of G. Wagoner of LLNLLLNL



Animation combines Animation combines inputs and outputs.inputs and outputs.

E3D computation at E3D computation at 0.3 Hz on a 0.3 Hz on a 144x137 grid with 144x137 grid with dh=308 m.dh=308 m.

Grid resolution is a Grid resolution is a good match to cell good match to cell phone displays.phone displays.

QuickTime™ and aVideo decompressor




PGV >5 cm/s PGV >5 cm/s above west-above west-dipping fault at dipping fault at 0.3 Hz.0.3 Hz.

Sub-basins Sub-basins contain the contain the greatest shaking.greatest shaking.


Northern Death Valley Fault ZoneNorthern Death Valley Fault Zone

Jachens Basin Jachens Basin & Range gravity & Range gravity inversions for inversions for sedimentary & sedimentary & volcanic basins.volcanic basins.

Timber Mtn. Timber Mtn. caldera & rifts caldera & rifts up to 8 km up to 8 km deep. deep.

Langenheim et Langenheim et al. model from al. model from gravity, gravity, refraction, a few refraction, a few deep wells deep wells inserted for inserted for LVV.LVV.



Jachens USGS Jachens USGS geologic map geologic map sets default soil sets default soil and rock Vs30s.and rock Vs30s.

Scott et al. Scott et al. (2006) Vs30 (2006) Vs30 model from model from 1100+ wells, 79 1100+ wells, 79 Vs profiles Vs profiles inserted for inserted for LVV. LVV.


No. Death Val. - Furnace Cr. Fault ZoneNo. Death Val. - Furnace Cr. Fault Zone

Animation combines Animation combines inputs and outputs.inputs and outputs.

E3D computation at E3D computation at 0.3 Hz on a 281x251 0.3 Hz on a 281x251 grid with dh=1 km.grid with dh=1 km.

Infinite Q.Infinite Q.

The two rupture The two rupture scenarios have very scenarios have very different effects.different effects.

Get the scenario animations on your cell phone from www.seismo.unr.edu/ma/Get the scenario animations on your cell phone from www.seismo.unr.edu/ma/

QuickTime™ and aVideo decompressor




For rupture For rupture toward city, toward city, PGV >1 cm/s in PGV >1 cm/s in LVV.LVV.

Clear directivity Clear directivity in this long-in this long-period period simulation.simulation.

Basins between Basins between DV and LVV are DV and LVV are spreading the spreading the directivity effect directivity effect to wider angles to wider angles from the fault from the fault strike.strike.


Northern Death Valley Fault ZoneNorthern Death Valley Fault ZoneCompare PGV of 2679 areas, each 1-kmCompare PGV of 2679 areas, each 1-km22, in LVV against Vs30 and Z2.0., in LVV against Vs30 and Z2.0.


Northern Death Valley Fault ZoneNorthern Death Valley Fault ZoneFurnace Creek M7.5 Scenario Ruptures, GM in Las Vegas Valley

0.000

0.002

0.004

0.006

0.008

0.010

0.012

0.014

0.016

0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00

Site Vs30, km/s

0.3-Hz E3D PGV, meter/sec

Rupture from NW

Rupture from NW

Rupture from NW

Rupture from NW

Rupture from NW

Rupture from SE

Rupture from SE

Rupture from SE

Rupture from SE

Rupture from SE

Vs30 affecting 1.5-km waves!


Northern Death Valley Fault ZoneNorthern Death Valley Fault ZoneFurnace Creek M7.5 Scenario Ruptures, GM in Las Vegas Valley

0.000

0.002

0.004

0.006

0.008

0.010

0.012

0.014

0.016

-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5

Basin Depth Z2.0, km

0.3-Hz E3D PGV, meter/sec

Rupture from NW

Rupture from NW

Rupture from NW

Rupture from NW

Rupture from NW

Rupture from SE

Rupture from SE

Rupture from SE

Rupture from SE

Rupture from SE

Un

cert

ain

ty in

PG

V


ConclusionsConclusions

Students can use MA-CME to set problems up, but Students can use MA-CME to set problems up, but plotting and visualizing are still lots of work.plotting and visualizing are still lots of work.

Scenario Results:Scenario Results: M7.5 Genoa–Mt. Rose–M7.5 Genoa–Mt. Rose– Reno basin at end of rupture gets 5 Reno basin at end of rupture gets 5

times the PGV of any other.times the PGV of any other. M5.0 Frenchman Mtn.–M5.0 Frenchman Mtn.– high PGV accompanied by short high PGV accompanied by short

duration, concentrated by deep basin structure.duration, concentrated by deep basin structure. M7.5 No. Death Valley–M7.5 No. Death Valley– rupture toward city produces up to 15 rupture toward city produces up to 15

times the PGV as rupture away.times the PGV as rupture away.• At long periods, 0.3 Hz, E3D is producing huge uncertainties At long periods, 0.3 Hz, E3D is producing huge uncertainties

in PGV.in PGV.

j. louie and l. preston nevada seismological laboratory s. larsen

Documents

basin depths

reno basin gravity study

model renderings

usgs basin gravity inversions

vs30 model fr

deep wells

basin range sedimentary

las vegas model