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Building a Las Vegas Seismic Model

Building a Las Vegas Seismic Model. Deep Volcanic Rifts. Las Vegas Basin. Little Skull Mtn. Model Rendered as Amplification Map. Geology, Basin Depth, Geotech, Geophysical data into ModelAssembler. Deep Volcanic Rifts. Las Vegas Basin. Little Skull Mtn.

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Building a Las Vegas Seismic Model

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  1. Building a Las Vegas Seismic Model

  2. Deep Volcanic Rifts Las Vegas Basin Little Skull Mtn. Model Rendered as Amplification Map • Geology, Basin Depth, Geotech, Geophysical data into ModelAssembler

  3. Deep Volcanic Rifts Las Vegas Basin Little Skull Mtn. Max. Ground Motion Computed– 0.5 Hz • E3D elastic finite-difference solution, by Shawn Larsen, LLNL

  4. LVV GM Pattern Computed at 0.5 Hz • Raw maximum horiz. motion is “speckly” (left) • Smooth to clarify streaks (arrows, right); geological input to grid is smooth

  5. LVV GM Pattern Origin in Basin Depth? • GM pattern in LVV (left) does not resemble basin-depth map (right) • Some GM amplification at steep walls of basin on north and east (circled)

  6. LVV GM Pattern Origin in Basin Edges? • Complexities in the basin edges– re-entrants of shallow basins into the bedrock (circles)– concentrate conversion of Rayleigh-wave energy in the bedrock to Love-wave energy in the re-entrants, which channels down the small valleys and “beams” across the main basin. • This effect is highly source, path, and basin dependent. • The re-entrant basins need only be ~100 m deep. Inspiration from Bill Stephenson, GNS Soil Dynam. Earthquake Eng. 25 (2005) 187-196

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