Basin Waves on a Seafloor Recording of the 1990 Upland, California, Earthquake: Implications for Ground Motions from a Larger Earthquake

Abstract The velocity and displacement time series from a recording on the seafloor at 74 km from the 1990 Upland earthquake ( M = 5.6) are dominated by late-arriving waves with periods of 6 to 7 sec. These waves are probably surface waves traveling across the Los Angeles basin. Response spectra for the recording are in agreement with predictions from empirical regression equations and theoretical models for periods less than about 1 sec but are significantly larger than those predictions for longer periods. The longer-period spectral amplitudes are controlled by the late-arriving waves, which are not included in the theoretical models and are underrepresented in the data used in the empirical analyses. When the motions are scaled to larger magnitude, the results are in general agreement with simulations of wave propagation in the Los Angeles basin by Graves (1998).

[1]  Charles E. Smith,et al.  Analysis of earthquake recordings obtained from the Seafloor Earthquake Measurement System (SEMS) instruments deployed off the coast of southern California , 1999 .

[2]  W. Silva,et al.  An empirical study of earthquake source spectra for California earthquakes , 1997, Bulletin of the Seismological Society of America.

[3]  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.

[4]  W. B. Joyner.  Strong motion from surface waves in deep sedimentary basins , 2000 .

[5]  N. Abrahamson,et al.  Empirical Response Spectral Attenuation Relations for Shallow Crustal Earthquakes , 1997 .

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

[7]  David M. Boore,et al.  Comparing Shear-Wave Velocity Profiles From Inversion of Surface-Wave Phase Velocities with Downhole Measurements: Systematic Differences Between the CXW Method and Downhole Measurements at Six USC Strong-Motion Sites , 1998 .

[8]  L. M. Baker,et al.  Transient stresses at Parkfield, California, produced by the M 7.4 Landers earthquake of June 28, 1992: Observations from the UPSAR dense seismograph array , 1995 .

[9]  S. Kramer.  Geotechnical Earthquake Engineering , 1996 .

[10]  R. F. Yerkes,et al.  Geology of the Los Angeles Basin, California: an introduction , 1965 .

[11]  Hakeem,et al.  Phylogenetic classification of the world ’ s tropical forests , 2018 .

[12]  Thomas C. Hanks,et al.  Strong ground motion of the San Fernando, California, earthquake: Ground displacements , 1975, Bulletin of the Seismological Society of America.

[13]  Donald V. Helmberger,et al.  Elastic finite-difference modeling of the 1971 San Fernando , 1988 .

[14]  David M. Boore,et al.  SSMSIM : Fortran programs for simulating ground motions from earthquakes , 1996 .

[15]  D. Helmberger,et al.  Complex faulting deduced from broadband modeling of the 28 February 1990 Upland earthquake (ML = 5.2) , 1991, Bulletin of the Seismological Society of America.

[16]  Gail M. Atkinson,et al.  Evaluation of models for earthquake source spectra in eastern North America , 1998, Bulletin of the Seismological Society of America.

[17]  W. B. Joyner,et al.  Equations for Estimating Horizontal Response Spectra and Peak Acceleration from Western North American Earthquakes: A Summary of Recent Work , 1997 .

[18]  Kim B. Olsen,et al.  Three-Dimensional Simulation of a Magnitude 7.75 Earthquake on the San Andreas Fault , 1995, Science.