Average seismic source-parameter relations for plate-margin earthquakes

Nuttli, Otto W.

doi:10.1016/0040-1951(85)90118-0

Cited by 83 publications

(95 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The relationship is also comparable to that found for eastern Canada (Hasegawa, 1983), whereas for the western United States an equivalent local magnitude corresponds to a seismic moment one order larger (Wyss and Brune, 1968;Hanks and Boore, 1984). A change in the moment-magnitude relation at a seismic moment between 1021 and 10" dyn cm, suggested in several investigations (Street et al, 1975;Hasegawa, 1983;Nuttli, 1983), could not be observed with confidence in this study due to the small numbers of large events.…”

Section: Seismic Moment -Corner Frequency Relationsupporting

confidence: 86%

Regional spectral scaling relations of source parameters for earthquakes in the Baltic Shield

1989

View full text Add to dashboard Cite

slight increase with increasing seismic moment in the range 3 x 10" to 5 x 10" dyn cm, while the increase is more rapid for larger events. Baltic Shield earthquakes show increasing stress drops, ranging from about 0.1 to 10 bars, for increasing seismic moment. The relatively low stress drops could, in part, be explained by bias due to band-limited analog data.The slope of the curve relating seismic moment to comer frequency is steeper than -3, which suggests a departure from a constant stress drop scaling relation proposed for large earthquakes. The derived relationship between the seismic moment (Mc) and magnitude (ML) is: log M,, = 16.93 + 1.01 M, (for 2 d M, < 5.2).

show abstract

Section: Seismic Moment -Corner Frequency Relationsupporting

confidence: 86%

Regional spectral scaling relations of source parameters for earthquakes in the Baltic Shield

1989

View full text Add to dashboard Cite

show abstract

“…Because of corner frequency effects for earthquakes and m b measurement procedures, there should be a change in slope for regressed M s (VMAX) versus m b near m b 5 (Nuttli, 1983). As shown in Figure 14, the slope for the best-fit regressions above m b 5 is 1.46 with a standard deviation of 0.21 m.u.…”

Section: Discussionmentioning

confidence: 98%

Development of a Time-Domain, Variable-Period Surface-Wave Magnitude Measurement Procedure for Application at Regional and Teleseismic Distances, Part II: Application and Ms-mb Performance

Bonner¹,

Russell

Harkrider³

et al. 2006

Bulletin of the Seismological Society of America

View full text Add to dashboard Cite

The Russell surface-wave magnitude formula, developed in Part I of this two-part article, and the M s (VMAX) measurement technique, discussed in this article, provide a new method for estimating variable-period surface-wave magnitudes at regional and teleseismic distances. The M s (VMAX) measurement method consists of applying Butterworth bandpass filters to data at center periods between 8 and 25 sec. The filters are designed to help remove the effects of nondispersed Airy phases at regional and teleseismic distances. We search for the maximum amplitude in all of the variable-period bands and then use the Russell formula to calculate a surface-wave magnitude.In this companion article, we demonstrate the capabilities of the method by using applications to three different datasets. The first application utilizes a dataset that consists of large earthquakes in the Mediterranean region. The results indicate that the M s (VMAX) technique provides regional and teleseismic surface-wave magnitude estimates that are in general agreement except for a small distance dependence of ‫200.0מ‬ magnitude units per degree. We also find that the M s (VMAX) estimates are less than 0.1 magnitude unit different than those from other formulas applied at teleseismic distances such as Rezapour and Pearce (1998) and Vanȇk et al. (1962).In the second and third applications of the method, we demonstrate that measurements of M s (VMAX) versus m b provide adequate separation of the explosion and earthquake populations at the Nevada and Lop Nor Test Sites. At the Nevada Test Site, our technique resulted in the misclassification of two earthquakes in the explosion population. We also determined that the new technique reduces the scatter in the magnitude estimates by 25% when compared with our previous studies using a calibrated regional magnitude formula. For the Lop Nor Test Site, we had no misclassified explosions or earthquakes; however, the data were less comprehensive.A preliminary analysis of Eurasian earthquake and explosion data suggest that similar slopes are obtained for observed M s (VMAX) versus m b data with m b Ͻ5. Thus the data are not converging at lower magnitudes. These results suggest that the discrimination of explosions from earthquakes can be achieved at lower magnitudes using the Russell (2006) formula and the M s (VMAX) measurement technique.

show abstract

“…Magnitudes of all events range between 4.0 and 7.0. For events prior to the CMT catalogue, M 0 was determined from either M s or m b using the relationships in Nuttli (1985).…”

Section: Earthquake Datamentioning

confidence: 99%

Plate boundary deformation between the Pacific and North America in the Explorer region

et al. 1998

View full text Add to dashboard Cite

One of the consequences of plate tectonics is that a spreading ridge will eventually approach a subduction zone. The problem whether the possible break-up of the approaching ridge will lead to the development of independent micro-plates, or not, is still unresolved. Some 4 million years ago the interaction between the Juan de Fuca Ridge and the Cascadia subduction zone resulted in ridge fragmentation in the Explorer region. There are two proposed post-Miocene kinematic models: one that proposes the presence of a micro-plate and the other that treats the region as a transform deformation zone, or so-called pseudo-plate. We use earthquake strain rates derived from 74 events since 1948 to estimate a long-term velocity field for the region. By comparing this result with the predicted velocity fields for both models we try to discriminate between the two. The earthquake strain rates indicate the presence of a transform deformation zone between the North American (NAM) and Pacific (PAC) plates. The velocity field derived from the inversion of the earthquake strain rates indicates that seismic activity takes up 50 š 30% .1¦ / of the PAC-NAM relative motion (NUVEL-1A; DeMets et al., 1994. Effect of recent revisions to the geomagnetic reversal time scale on estimates of current plate motions. Geophys. Res. Lett. 21, 2191Lett. 21, -2194 within the seismogenic layer of this zone and is indistinguishable in direction from the NUVEL-1A PAC-NAM model. The presence of this Explorer transform zone is consistent with the strain rate and velocity field for the 'pseudo-plate model' and indicates that seismicity defines a (new) plate boundary zone between the Pacific and North American plates. Earthquake-derived strain rates are low along the Nootka Transform, which accommodates relative motion between the Juan de Fuca and North American plates. The cause for the absence of significant seismic slip along this transform is unclear and may be closely linked to the fact that the adjacent Cascadia subduction zone is locked. The 'micro-plate model', which we reject, predicts SW-NE convergence in the eastern Explorer region and this is inconsistent with the earthquake strain rates as well as with surface fault observations. © 1998 Elsevier Science B.V. All rights reserved. Kreemer et al. / Tectonophysics 293 (1998) [225][226][227][228][229][230][231][232][233][234][235][236][237][238]

show abstract

Average seismic source-parameter relations for plate-margin earthquakes

Cited by 83 publications

References 12 publications

Regional spectral scaling relations of source parameters for earthquakes in the Baltic Shield

Regional spectral scaling relations of source parameters for earthquakes in the Baltic Shield

Development of a Time-Domain, Variable-Period Surface-Wave Magnitude Measurement Procedure for Application at Regional and Teleseismic Distances, Part II: Application and Ms-mb Performance

Plate boundary deformation between the Pacific and North America in the Explorer region

Contact Info

Product

Resources

About