Results 241 to 250 of about 1,865,478 (288)

The scalar moment and moment magnitude of microseismic events

SEG Technical Program Expanded Abstracts 2013, 2013
Summary We investigate the seismic moment and moment magnitude for microseismic events. We show that the scalar moment M T 0 defined by Bowers and Hudson (1999) should be used in microseismic studies for characterizing the size of an event and calculating its moment magnitude.
Wenjie Jiao, Michael Davidson, Arcangelo Sena, Bradley Bankhead   +3 more
openaire   +1 more source

Trunk muscle cocontraction: The effects of moment direction and moment magnitude

Journal of Orthopaedic Research, 1992
AbstractThis study investigated the cocontraction of eight trunk muscles during the application of asymmetric loads to the torso. External moments of 10, 20, 30, 40, and 50 Nm were applied to the torso via a harness system. The direction of the applied moment was varied by 30° increments to the subjects' right side between the sagittally symmetric ...
S A, Lavender, Y H, Tsuang, G B, Andersson, A, Hafezi, C C, Shin   +4 more
openaire   +2 more sources

Magnitudes and moments of duration

Bulletin of the Seismological Society of America, 1984
AbstractCoda-duration τ at 42 of the stations in the U.S. Geological Survey's central California seismic network (CALNET) for earthquakes in five source regions of central California—the Parkfield and San Juan Bautista sections of the San Andreas fault, the Sargent fault, the Coyote Lake section of the Calaveras fault, and the Livermore area—are used ...
openaire   +1 more source

Moment and moment magnitude of seismic events located by stacking

Geophysics, 2014
ABSTRACT 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, Leo Eisner, Mike Mueller   +2 more
openaire   +1 more source

Improved Relationships of Moment Magnitude with Regional and Local Magnitudes for Earthquakes in the United States

56th U.S. Rock Mechanics/Geomechanics Symposium, 2022
ABSTRACT: The moment magnitude is the preferred magnitude to characterize the earthquake source. Moment magnitudes (Mw) are calculated from moment tensor inversion. In contrast, the regional short period surface-wave magnitude (Mblg) and local magnitude (ML) are calculated using the amplitude of the Lg surface waves
B. Kc, A. Amirlatifi, E. Ghazanfari
openaire   +1 more source

Earthquake: Magnitudes, Energy, and Moment

2015
Corner frequency The frequency fc at which the curve that represents the Fourier amplitude spectrum of a signal abruptly changes its slope (see Fig. 4). For earthquakes, this frequency is related to the seismic source properties such as fault size, stress drop in the source volume, rupture velocity, and related rupture duration.
Peter Bormann, Domenico Di Giacomo
openaire   +1 more source

Moment—magnitude scaling in the Aegean area

Tectonophysics, 1990
Abstract Sixteen new determinations of scalar seismic moment from spectral modelling of Rayleigh waves at 30–60 s period in the Aegean area are presented. When combined with earlier results obtained by a similar method, the moment-magnitude relationship from 50 events in the magnitude range 5.3 M s log M o = 1.5 M s + 9.198(∓ 0.317) for
Ian G. Main, Paul W. Burton
openaire   +1 more source

Magnitude of localized magnetic moments in metals

physica status solidi (b), 1979
AbstractThe magnitude of the localized magnetic moment of a transition or rare earth element impurity in a metal is evaluated within the framework of the Anderson model. Rotational invariance is preserved throughout. Graphs of the magnitude of the magnetization as a function of the relevant darameters of the model are provided and discussed.
M. Kiwi, E. Pestana, R. Ramírez
openaire   +1 more source

Moment‐magnitude relations in theory and practice

Journal of Geophysical Research: Solid Earth, 1984
The observation that motivates this study is the difference in c values in moment‐magnitude relations of the form log MO = cML + d between central and southern California. This difference is not at all related to geographical area; rather, it results from positive curvature in the log MO ‐ ML plane and the relatively large number of ML<5 earthquakes
Thomas C. Hanks, David M. Boore
openaire   +1 more source

Local Magnitude, a Moment Revisited

Bulletin of the Seismological Society of America, 2006
A simple theoretical analysis shows that both local magnitude M L and seismic moment M or equivalently moment magnitude M w are, in principle, measures of basic properties of the earthquake source: M L is proportional to the maximum of the moment-rate function, whereas M is proportional to its integral.
openaire   +1 more source