CENTRAL UNITED STATES VELOCITY MODEL VERSION 1:

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CENTRAL UNITED STATES VELOCITY MODEL VERSION 1
DESCRIPTION AND VALIDATION
Leonardo Ramirez-Guzman, Robert A. Williams,
Oliver Boyd and Stephen Hartzell (USGS).

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A PIECE OF THE PUZZLE
Project Earthquake simulations in the New
Madrid Seismic Zone The 18111812 Bicentennial.
Model Extension
Input
Source definition Deterministic and Probablistic
Continious representation Discretized
representation (etree)
Solver
1D LAYERED STRUCTURE
1Hz (FEM HERCULES)
Topographic map showing the extension of the
CUSVM and earthquakes greater than magnitude 2.5
(red circles) that occurred after 1972.
Conceptual framework similar to those already
done for 1906 and 1868 Hayward (Bay Area) and
Shakeout (Southern CA) scenarios.
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VELOCITY MODEL
Model Overview. The white lines delineate the
boundaries between the oldest units. The colormap
indicates the Vs (m/s) distribution.
IN
IL
KY
MO
TN
AL
Vs(m/s)
AR
Upper Crust (ENA Model)
Lower Crust
Precambrian Unconformity
Modified Lower Crust
Moho
Upper Mantle
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SHALLOW STRUCTURE
Shallow structure. Velocity and topography. The
colormap indicates the Vs (m/s) distribution.
St. Louis
Latitude
Memphis
St. Louis Arch
St. Louis area
Latitude
0 500 1000 1500
2000
Memphis area
Vs(m/s)
Latitude