scholarly journals Estimating seismic moment magnitude (Mw) of tremor bursts in northern Cascadia: Implications for the “seismic efficiency” of episodic tremor and slip

2010 ◽  
Vol 37 (19) ◽  
pp. n/a-n/a ◽  
Author(s):  
Honn Kao ◽  
Kelin Wang ◽  
Herb Dragert ◽  
Jason Y. Kao ◽  
Garry Rogers
Keyword(s):  
Seismic Moment ◽  
Moment Magnitude ◽  
Seismic Efficiency ◽  
Episodic Tremor And Slip ◽  
Seismic Moment Magnitude ◽  
Episodic Tremor

Source Parameters and Seismic Moment-Magnitude Scaling for Northwestern Turkey

2007 ◽  
Vol 97 (2) ◽  
pp. 655-660 ◽  
Author(s):  
S. Parolai ◽  
D. Bindi ◽  
E. Durukal ◽  
H. Grosser ◽  
C. Milkereit
Keyword(s):  
Seismic Moment ◽  
Source Parameters ◽  
Moment Magnitude ◽  
Magnitude Scaling ◽  
Northwestern Turkey ◽  
Seismic Moment Magnitude

A Seismic Moment Magnitude Scale

2019 ◽  
Vol 109 (4) ◽  
pp. 1542-1555 ◽  
Author(s):  
Ranjit Das ◽  
Mukat Sharma ◽  
Deepankar Choudhury ◽  
Gabriel Gonzalez
Keyword(s):  
Seismic Moment ◽  
Moment Magnitude ◽  
Magnitude Scale ◽  
Seismic Moment Magnitude

On the mN, M Relation for Eastern North American Earthquakes

1987 ◽  
Vol 58 (4) ◽  
pp. 119-124 ◽  
Author(s):  
Gail M. Atkinson ◽  
David M. Boore
Keyword(s):  
North America ◽  
Stochastic Model ◽  
Ground Motion ◽  
Seismic Moment ◽  
The Other ◽  
Moment Magnitude ◽  
Scaling Relations ◽  
Eastern North America ◽  
Data Set ◽  
Meaningful Data

Abstract A stochastic model of ground motion has been used as a basis for comparison of data and theoretically-predicted relations between mN (commonly denoted by mbLg) and moment magnitude for eastern North America (ENA) earthquakes. mN magnitudes are recomputed for several historical ENA earthquakes, to ensure consistency of definition and provide a meaningful data set. We show that by itself the magnitude relation cannot be used as a discriminant between two specific spectral scaling relations, one with constant stress and the other with stress increasing with seismic moment, that have been proposed for ENA earthquakes.

scholarly journals Analysis of strong-motion data of the 1990 Eastern Sicily earthquake

1995 ◽  
Vol 38 (2) ◽  
Author(s):  
M. Di Bona ◽  
M. Cocco ◽  
A. Rovelli ◽  
R. Berardi ◽  
E. Boschi
Keyword(s):  
Frequency Band ◽  
Stress Drop ◽  
Seismic Moment ◽  
Ground Motions ◽  
Broad Band ◽  
Strong Motion ◽  
Moment Magnitude ◽  
Corner Frequency ◽  
Local Magnitude ◽  
The Moment

The strong motion accelerograms recorded during the 1990 Eastern Sicily earthquake have been analyzed to investigate source and attenuation parameters. Peak ground motions (peak acceleration, velocity and displacement) overestimate the values predicted by the empirical scaling law proposed for other Italian earthquakes, suggesting that local site response and propagation path effects play an important role in interpreting the observed time histories. The local magnitude, computed from the strong motion accelerograms by synthesizing the Wood-Anderson response, is ML = 5.9, that is sensibly larger than the local magnitude estimated at regional distances from broad-band seismograms (ML = 5.4). The standard omega-square source spectral model seems to be inadequate to describe the observed spectra over the entire frequency band from 0.2 to 20 Hz. The seismic moment estimated from the strong motion accelerogram recorded at the closest rock site (Sortino) is Mo = 0.8 x 1024 dyne.cm, that is roughly 4.5 times lower than the value estimated at regional distances (Mo = 3.7 x 1024 dyne.cm) from broad-band seismograms. The corner frequency estimated from the accelera- tion spectra i.5 J; = 1.3 Hz, that is close to the inverse of the dUl.ation of displacement pulses at the two closest recording sites. This value of corner tì.equency and the two values of seismic moment yield a Brune stress drop larger than 500 bars. However, a corner frequency value off; = 0.6 Hz and the seismic moment resulting from regional data allows the acceleration spectra to be reproduced on the entire available frequency band yielding to a Brune stress drop of 210 bars. The ambiguity on the corner frequency value associated to this earthquake is due to the limited frequency bandwidth available on the strong motion recordil1gs. Assuming the seismic moment estimated at regional distances from broad-band data, the moment magnitude for this earthquake is 5.7. The higher local magnitude (5.9) compared with the moment magnitude (5.7) is due to the weak regional attenuation. Beside this, site amplifications due to surface geology have produced the highest peak ground motions among those observed at the strong motion sites.

scholarly journals Slab morphology in the Cascadia fore arc and its relation to episodic tremor and slip

2010 ◽  
Vol 115 ◽  
Author(s):  
Pascal Audet ◽  
Michael G. Bostock ◽  
Devin C. Boyarko ◽  
Michael R. Brudzinski ◽  
Richard M. Allen
Keyword(s):  
Episodic Tremor And Slip ◽  
Episodic Tremor
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