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Seismic moments and volume changes
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1976For many situations of practical interest, the seismicity that results from ground deformation associated with a change in volume, Δ V, is related to the volume change by ΣM0 = Kμ∣ΔV∣, where ΣM0 is the sum of the seismic moments of the earthquake population, μ is the modulus of rigidity, and K is a factor close to 1.
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Moment and moment magnitude of seismic events located by stacking
Geophysics, 2014ABSTRACT Determination of moment and moment magnitude for seismic events located by stacking has been an unsolved problem because current methodologies cannot be applied. To solve this problem, we have developed a methodology for moment magnitude Mw estimation of (micro) seismic events.
Robert Cieplicki +2 more
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Effect of seismic moment–area scaling on apparent stress–seismic moment relationship
Physics of the Earth and Planetary Interiors, 2012Abstract Two alternative formulations of the apparent stress, representing homogeneous crack and triangle pulse rupture models, are tested. They are termed seismic state equations and express the apparent stress, τ a , as a function of, respectively, two or three other earthquake parameters: seismic moment, M 0 , rupture area, A , and, in the ...
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Defining the scalar moment of a seismic source with a general moment tensor
Bulletin of the Seismological Society of America, 1999Abstract We compare several published definitions of the scalar moment M0, a measure of the size of a seismic disturbance derived from the second-order seismic moment tensor M (with eigenvalues m1 ≥ m3 ≥ m2). While arbitrary, a useful definition is in terms of a total moment, MT0 = MI + MD, where MI = |M|, with M = (m1 + m2 + m3)/3, is ...
David Bowers, John A. Hudson
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1981
Originally introduced as a physically meaningful tool to obtain the excitation coefficients of the normal modes of the earth, the moment tensor has since been appreciated as a concept of more general utility. This paper aims to review this development, and at the same time to obtain simple approximations which are hoped to bridge a gap between abstract
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Originally introduced as a physically meaningful tool to obtain the excitation coefficients of the normal modes of the earth, the moment tensor has since been appreciated as a concept of more general utility. This paper aims to review this development, and at the same time to obtain simple approximations which are hoped to bridge a gap between abstract
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Simultaneous determination of the seismic moment and attenuation of seismic surface waves
Bulletin of the Seismological Society of America, 1969Abstract A comprehensive spectral analysis of Love and Rayleigh waves was made on the Parkfield earthquake of June 28, 1966. Using tentative Q values obtained by the usual two-station method for continental and oceanic paths, the observed spectra were corrected for dissipation, and used for obtaining a tentative source model.
Yi-Ben Tsai, Keiiti Aki
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Seismic moment connections for MRFs
Journal of Constructional Steel Research, 1988Abstract This paper provides an overview of the state of the art for the design of steel moment connections for moment-resisting frames (MRFs) for regions of high seismic risk. The need to design such connections to be ductile with the capacity to sustain full load reversals is indicated first.
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Earthquake magnitude or seismic moment in seismic hazard evaluation?
pure and applied geophysics, 1988Seismic hazard analysis requires the estimation of the probabilities that earthquakes will take place within a region of interest, and the expected level of ground motion which will be received at a site during the nextt years. The earthquake magnitude has been used as a basic parameter, because it is available, under the assumption that the earthquake
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A SEISMIC MOMENT MAGNITUDE SCALE
Theaimofobtaininga single scale for earthquake magnitudes has led many studies in the past to either develop relationships among various existing scales or develop an altogether new scale to represent a wide range of magnitudes on a single scale.Ranjit DAS Das +4 more
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Seismic moment of great deep shocks
Physics of the Earth and Planetary Interiors, 1976Abstract The long-period Rayleigh waves were investigated for the largest four deep shocks in 1963–1973 to determine the seismic moment by the same technique as used for shallow earthquakes. The results could be used for a quantitative comparison of source parameters between shallow and deep events. Three of the four shocks occurred beneath the South
Muneyoshi Furumoto, Yoshio Fukao
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