Three-dimensional finite-difference modeling of non-linear ground notion

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We present a hybrid finite-difference technique capable of modeling non-linear soil amplification from the 3-D finite-fault radiation pattern for earthquakes in arbitrary earth models. The method is applied to model non-linear effects in the soils of the San Fernando Valley (SFV) from the 17 January 1994 M 6.7 Northridge earthquake. 0-7 Hz particle velocities are computed for an area of 17 km by 19 km immediately above the causative fault and 5 km below the surface where peak strike-parallel, strike-perpendicular, vertical, and total velocities reach values of 71 cm/s, 145 cm/s, 152 cm/s, and 180 cm/s, respectively. Selected Green`s functions ... continued below

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10 p.

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Jones, E.M. & Olsen, K.B. August 1, 1997.

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  • Jones, E.M. Los Alamos National Lab., NM (United States)
  • Olsen, K.B. California Univ., Santa Barbara, CA (United States). Inst. for Crustal Studies

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We present a hybrid finite-difference technique capable of modeling non-linear soil amplification from the 3-D finite-fault radiation pattern for earthquakes in arbitrary earth models. The method is applied to model non-linear effects in the soils of the San Fernando Valley (SFV) from the 17 January 1994 M 6.7 Northridge earthquake. 0-7 Hz particle velocities are computed for an area of 17 km by 19 km immediately above the causative fault and 5 km below the surface where peak strike-parallel, strike-perpendicular, vertical, and total velocities reach values of 71 cm/s, 145 cm/s, 152 cm/s, and 180 cm/s, respectively. Selected Green`s functions and a soil model for the SFV are used to compute the approximate stress level during the earthquake, and comparison to the values for near-surface alluvium at the U.S. Nevada Test Site suggests that the non-linear regime may have been entered. We use selected values from the simulated particle velocity distribution at 5 km depth to compute the non-linear response in a soil column below a site within the Van Norman Complex in SFV, where the strongest ground motion was recorded. Since site-specific non- linear material parameters from the SFV are currently unavailable, values are taken from analyses of observed Test Site ground motions. Preliminary results show significant reduction of spectral velocities at the surface normalized to the peak source velocity due to non-linear effects when the peak velocity increases from 32 cm/s (approximately linear case) to 64 cm/s (30-92%), 93 cm/s (7-83%), and 124 cm/s (2-70%). The largest reduction occurs for frequencies above 1 Hz.

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10 p.

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OSTI as DE97008888

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  • Northridge earthquake research conference, Los Angeles, CA (United States), 22-29 Aug 1997

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  • Other: DE97008888
  • Report No.: LA-UR--97-2408
  • Report No.: CONF-970896--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 629291
  • Archival Resource Key: ark:/67531/metadc698177

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  • August 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • May 5, 2016, 7:25 p.m.

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Jones, E.M. & Olsen, K.B. Three-dimensional finite-difference modeling of non-linear ground notion, article, August 1, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc698177/: accessed December 10, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.