Characterization of Near-Source Ground Motions with Earthquake Simulations

We examine the characteristics of long-period near-source ground motions by conducting a sensitivity study with variations in six earthquake source parameters for both a strike-slip fault (M 7.0-7.1) and a thrust fault (M 6.6-7.0). The directivity of the ruptures creates large displacement and velocity pulses in the forward direction. The dynamic displacements close to the fault are comparable to the average slip. The ground motions exhibit the greatest sensitivity to the fault depth with moderate sensitivity to the rupture speed, peak slip rate, and average slip. For strike-slip faults and thrust faults with surface rupture, the maximum ground displacements and velocities occur in the region where the near-source factor from the 1997 Uniform Building Code is the largest. However, for a buried thrust fault the peak ground motions can occur up-dip from this region.

[1]  John F. Hall,et al.  Seismic response of steel frame buildings to near‐source ground motions , 1998 .

[2]  Robert W. Graves,et al.  Three-dimensional finite-difference modeling of the San Andreas fault: Source parameterization and ground-motion levels , 1998, Bulletin of the Seismological Society of America.

[3]  J. Brune.  Tectonic stress and the spectra of seismic shear waves from earthquakes , 1970 .

[4]  Takashi Miyatake,et al.  Dynamic Rupture Processes on a Dipping Fault, and Estimates of Stress Drop and Strength Excess from the Results of Waveform Inversion , 1993 .

[5]  Kim B. Olsen,et al.  Three-dimensional simulation of earthquakes on the Los Angeles fault system , 1996, Bulletin of the Seismological Society of America.

[6]  Ralph J. Archuleta,et al.  The Three-Dimensional Dynamics of Dipping Faults , 2000 .

[7]  D. Oglesby,et al.  Erratum: ``Dynamics of dip-slip faulting: Explorations in two dimensions'' , 2000 .

[8]  D. Wald,et al.  Spatial and temporal distribution of slip for the 1992 Landers, California, earthquake , 1994, Bulletin of the Seismological Society of America.

[9]  Chu-Chuan Peter Tsai,et al.  Characteristics of strong ground motion across a thrust fault tip from the September 21, 1999, Chi‐Chi, Taiwan earthquake , 2000 .

[10]  Oglesby,et al.  Earthquakes on dipping faults: the effects of broken symmetry , 1998, Science.

[11]  J. Brune,et al.  Dynamics of thrust faulting: 2D lattice model , 1998, Bulletin of the Seismological Society of America.

[12]  R. Madariaga,et al.  Dynamic Propagation and Interaction of a Rupture Front on a Planar Fault , 2000 .

[13]  L. B. Freund,et al.  The mechanics of dynamic shear crack propagation , 1979 .

[14]  Marvin W. Halling,et al.  Near-Source Ground Motion and its Effects on Flexible Buildings , 1995 .

[15]  O. Ghattas,et al.  Simulations of Long-Period Ground Motions during the 1995 Hyogoken-Nanbu ( Kobe ) Earthquake using 3 D Finite Element Method , 1998 .

[16]  C. K. Saikia,et al.  Estimated ground motions in Los Angeles due to MW = 7 earthquake on the Elysian thrust fault , 1993 .

[17]  Kojiro Irikura,et al.  Three-dimensional simulation of the near-fault ground motion for the 1995 Hyogo-Ken Nanbu (Kobe), Japan, earthquake , 1998, Bulletin of the Seismological Society of America.

[18]  Kojiro Irikura,et al.  Source model of the 1995 Hyogo-Ken Nanbu earthquake and simulation of near-source ground motion , 1998, Bulletin of the Seismological Society of America.

[19]  D. Wald,et al.  Response of High-Rise and Base-Isolated Buildings to a Hypothetical Mw 7.0 Blind Thrust Earthquake , 1995, Science.

[20]  M. Husseini.  Energy balance for motion along a fault , 1977 .

[21]  T. Nakata,et al.  Large slip velocity of the surface rupture associated with the 1990 Luzon Earthquake , 1994 .

[22]  D. Wald.  Slip History of the 1995 Kobe, Japan, Earthquake Determined from Strong Motion, Teleseismic, and Geodetic Data , 1996 .

[23]  T. Heaton.  Evidence for and implications of self-healing pulses of slip in earthquake rupture , 1990 .

[24]  Brad Thomas Aagaard.  Finite-element simulations of earthquakes , 2000 .

[25]  Tomohiro Inoue,et al.  3D simulation of near-field strong ground motion based on dynamic modeling , 1998, Bulletin of the Seismological Society of America.

[26]  L. Neil Frazer,et al.  Use of ray theory to calculate high-frequency radiation from earthquake sources having spatially variable rupture velocity and stress drop , 1984 .

[27]  Ralph J. Archuleta,et al.  Three-dimensional numerical simulations of dynamic faulting in a half-space , 1978, Bulletin of the Seismological Society of America.

[28]  S. Day.  Three-dimensional simulation of spontaneous rupture: The effect of nonuniform prestress , 1982, Bulletin of the Seismological Society of America.

[29]  Thomas H. Heaton,et al.  Rupture model of the 1989 Loma Prieta earthquake from the inversion of strong-motion and broadband teleseismic data , 1991, Bulletin of the Seismological Society of America.

[30]  Kim B. Olsen,et al.  Three-Dimensional Dynamic Simulation of the 1992 Landers Earthquake , 1997 .

[31]  Thomas H. Heaton,et al.  Static deformations from point forces and force couples located in welded elastic poissonian half-spaces: Implications for seismic moment tensors , 1989, Bulletin of the Seismological Society of America.

[32]  J. Brune.  Particle motions in a physical model of shallow angle thrust faulting , 1996 .

[33]  Thomas H. Heaton,et al.  The slip history of the 1994 Northridge, California, earthquake determined from strong-motion, teleseismic, GPS, and leveling data , 1996, Bulletin of the Seismological Society of America.

[34]  David R. O'Hallaron,et al.  Large-scale simulation of elastic wave propagation in heterogeneous media on parallel computers , 1998 .