A stochastic fault model: 1. Static case

The number-size distribution of earthquakes requires that irregularities exist on a fault at all length scales. The assumption of self-similar irregularity is used to formulate a stochastic description of the faulting process. A random irregularity is termed self similar if it remains statistically similar upon a change of length scale. Self-similar geometric irregularity of a fault surface is represented in this model by stress and friction functions that fluctuate self similarly on a plane. If the set of rupture areas of all earthquakes on the brittle portion of a fault plane is assumed to be self similar, then the number of ruptures with area greater than A is proportional to 1/A. If stress drop is independent of earthquake size, then the number of earthquakes with moment greater than M/sub 0/ is proportional to M/sub 0//sup -2/3/. The size of an earthquake is determined by spatial fluctuation of the initial stress and sliding friction functions. The spectrum of the stress function is related to both the average stress drop as a function of earthquake size and the number-moment distribution. A model of the slip and stress change functions of an earthquake is constructed in the Fourier transform domain. While the stressmore » function becomes smoother in an earthquake at the length scale of the rupture, it becomes rougher at shorter length scales to prepare the fault for future smaller earthquakes. Seismicity is a cascade of stored elastic energy from longer to shorter wavelengths.« less

[1]  J. Crank Tables of Integrals , 1962 .

[2]  J. Tchalenko Similarities between Shear Zones of Different Magnitudes , 1970 .

[3]  G. Watson Bessel Functions. (Scientific Books: A Treatise on the Theory of Bessel Functions) , 1923 .

[4]  W. Bakun,et al.  Local magnitudes, seismic moments, and coda durations for earthquakes near Oroville, California , 1977, Bulletin of the Seismological Society of America.

[5]  D. J. Andrews,et al.  Coupling of energy between tectonic processes and earthquakes , 1978 .

[6]  W. D. Ortlepp,et al.  Anatomy of a mining-induced fault zone , 1979 .

[7]  F. A. Dahlen,et al.  On the ratio of P-wave to S-wave corner frequencies for shallow earthquake sources , 1974, Bulletin of the Seismological Society of America.

[8]  J. R. Wallis,et al.  Some long‐run properties of geophysical records , 1969 .

[9]  B. Kamb Sliding motion of glaciers: Theory and observation , 1970 .

[10]  K. Aki Characterization of barriers on an earthquake fault , 1979 .

[11]  D. L. Anderson,et al.  Theoretical Basis of Some Empirical Relations in Seismology by Hiroo Kanamori And , 1975 .

[12]  James D. Byerlee,et al.  The mechanics of stick-slip☆ , 1970 .

[13]  S. M. Spottiswoode,et al.  Source parameters of tremors in a deep-level gold mine , 1975 .

[14]  D. J. Andrews,et al.  From antimoment to moment: Plane-strain models of earthquakes that stop , 1975, Bulletin of the Seismological Society of America.

[15]  N. A. Haskell Total energy and energy spectral density of elastic wave radiation from propagating faults , 1964 .

[16]  Benoit B. Mandelbrot,et al.  Some noises with I/f spectrum, a bridge between direct current and white noise , 1967, IEEE Trans. Inf. Theory.

[17]  J. R. Wallis,et al.  Computer Experiments with Fractional Gaussian Noises: Part 2, Rescaled Ranges and Spectra , 1969 .

[18]  T. Madden Random Networks and Mixing Laws , 1976 .

[19]  J. R. Wallis,et al.  Noah, Joseph, and Operational Hydrology , 1968 .

[20]  H. Kanamori,et al.  A moment magnitude scale , 1979 .

[21]  C. Bufe,et al.  Implication of seismicity for failure of a section of the San Andreas Fault , 1980 .

[22]  A. Nur Nonuniform friction as a physical basis for earthquake mechanics , 1978 .

[23]  K. Aki Scaling law of seismic spectrum , 1967 .

[24]  M. Wyss Towards a Physical Understanding of the Earthquake Frequency Distribution , 1973 .

[25]  Paul Segall,et al.  Mechanics of discontinuous faults , 1980 .

[26]  Thomas C. Hanks,et al.  b values and ω−γ seismic source models: Implications for tectonic stress variations along active crustal fault zones and the estimation of high‐frequency strong ground motion , 1979 .

[27]  R. Burridge,et al.  Dynamic Shear Cracks with Friction as Models for Shallow Focus Earthquakes , 1971 .

[28]  J. R. Wallis,et al.  Computer Experiments With Fractional Gaussian Noises: Part 1, Averages and Variances , 1969 .

[29]  Thomas C. Hanks,et al.  Earthquake stress drops, ambient tectonic stresses and stresses that drive plate motions , 1977 .

[30]  J. B. Walsh Stiffness in faulting and in friction experiments , 1971 .

[31]  Thomas C. Hanks,et al.  Source parameters of southern California earthquakes , 1973 .

[32]  N. A. Haskell,et al.  Total Energy and Energy Spectral Density of Elastic Wave Radiation from Propagating Faults: Part II. a Statistical Source Model , 1966 .