Results 201 to 210 of about 908 (240)
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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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Moment Tensor Analysis of Rockslide Seismic Signals
Bulletin of the Seismological Society of America, 2015Abstract Seismic signal analysis can provide valuable information to understand rockslide dynamics in the absence of direct observation. Established methods of moment tensor inversion may assist with rapid rockslide parameter estimation, which can be crucial for mitigating secondary hazards.
Franziska Dammeier +4 more
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The Asymmetric Seismic Moment Tensor in Micropolar Media
Bulletin of the Seismological Society of America, 2018Coseismic block rotations are observed in the vicinity of seismogenic faults and have an effect on the moment tensor. This can be accounted for using the linear micropolar theory, which allows the existence of an independent rotation or spin θ different from the continuum rotation 1=2 curl u.
Abreu, Rafael +2 more
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Estimating Explosion Yields Using Moment Tensor Solutions and Seismic Moment
Seismological Research Letters, 2022Abstract Seismic moment, a measurable and well-understood quantity of seismic sources, is used to estimate the yield of explosions. Application of such a method in the past, as in the manner of mb-derived yields, has been complicated by the effect of variations in the explosion working point, depth, and secondary source effects (such as ...
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Seismic source spectra and moment tensors
Physics of the Earth and Planetary Interiors, 1982Abstract When the source spectrum is expanded in powers of frequency, the coefficient of the n th power is a linear function of the n th moment tensor. This shows explicitly the low-frequency approximation by moments of low degree, and suggests suitable ways of extrapolation.
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Reliability tests of moment tensor inversion of anthropogenic seismicity
2021<p>Seismic moment tensor becomes part of basic seismic data processing. For anthropogenic events mostly common and available method to determine mechanism is amplitude inversion. However essential for correct amplitude inversion are good quality data.
Anna Tymińska, Grzegorz Lizurek
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Surface strain accumulation and the seismic moment tensor
Bulletin of the Seismological Society of America, 1997Abstract Although the scalar moment accumulation rate within the seismogenic zone beneath a given area is sometimes deduced from the observed average surface strain accumulation rate over that same area (e.g., Working Group on California Earthquake Probabilities, 1995), the correspondence between the two is very uncertain.
J. C. Savage, R. W. Simpson
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Seismological Research Letters, 2012
Online material: Software source code; examples; sample plots. The graphical representation of a focal mechanism as a plot of the radiation pattern on the focal sphere (sometimes referred to as “beachball diagram”) is well established. It consists of a spherical projection on a unit sphere centered at the source point of a seismic event.
Krieger, L., Heimann, S.
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Online material: Software source code; examples; sample plots. The graphical representation of a focal mechanism as a plot of the radiation pattern on the focal sphere (sometimes referred to as “beachball diagram”) is well established. It consists of a spherical projection on a unit sphere centered at the source point of a seismic event.
Krieger, L., Heimann, S.
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Seismic Network Calibration for Retrieving Accurate Moment Tensors
Bulletin of the Seismological Society of America, 2012We present a method for calibrating seismic networks in order to retrieve highly accurate seismic moment tensors. The method is based on a joint inversion of large datasets of earthquakes for moment tensors and for amplifications of the network stations, which encompass the instrumental amplifications of sensors and the gain factor of the acquisition ...
R. Davi, V. Vavrycuk
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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
openaire +1 more source