Scaling Transition in Earthquake Sources: A Possible Link Between Seismic and Laboratory Measurements

Malagnini, L.; Mayeda, Kevin; Nielsen, S. B.; Yoo, Seung Jin; Munafò, Irene; Rawles, C.; Boschi, E.

doi:10.1007/s00024-013-0749-8

Cited by 34 publications

(25 citation statements)

References 62 publications

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“…This value is low relative to some other eastern North America events, and even many shallow‐induced events [e.g., Block et al , ] and shallow hydraulic events [e.g., Goertz‐Allmann et al ., ]. However, it is well within the large range of values for normal tectonic earthquakes [e.g., Cotton et al , ; Malagnini et al , ]. For the 2011 Prague main shock the 1 MPa apparent stress value is qualitatively similar to the results of Sun and Hartzell [], who obtained an overall stress drop of 1.6 MPa.…”

Section: Resultssupporting

confidence: 91%

Earthquake stress via event ratio levels: Application to the 2011 and 2016 Oklahoma seismic sequences

Walter

Yoo²,

Mayeda

et al. 2017

Geophysical Research Letters

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We develop a new methodology for determining earthquake stress drop and apparent stress values via spectral ratio asymptotic levels. With sufficient bandwidth, the stress ratio for a pair of events can be directly related to these low‐ and high‐frequency levels. This avoids the need to assume a particular spectral model and derive stress drop from cubed corner frequency measures. The method can be applied to spectral ratios for any pair of closely related earthquakes and is particularly well suited for coda envelope methods that provide good azimuthally averaged, point‐source measures. We apply the new method to the 2011 Prague and 2016 Pawnee earthquake sequences in Oklahoma. The sequences show stress scaling with size and depth, with the largest events having apparent stress levels near 1 MPa and smaller and/or shallower events having systematically lower stress values.

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Section: Resultssupporting

confidence: 91%

Earthquake stress via event ratio levels: Application to the 2011 and 2016 Oklahoma seismic sequences

Walter

Yoo²,

Mayeda

et al. 2017

Geophysical Research Letters

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“…However, this is not the case because we have carefully obtained source spectra by correcting for propagation effects. Malagnini et al [] suggests that the non‐self‐similar stress drop scaling, derived assuming an omega‐squared model like the present case, may be explained by the self‐similar scaling under the assumption of a non‐omega‐square fall‐off model. Although we cannot rule out this possibility based on the present data set alone, we favor the omega‐squared model because it satisfactorily explains the observed spectral ratios satisfactorily (Figure S8) and is also supported by a number of microearthquake observations [e.g., Abercrombie , ; Ide et al , ; Imanishi and Ellsworth , ].…”

Section: Source Spectra and Source Parameterssupporting

confidence: 66%

Non‐self‐similar source property for microforeshocks of the 2014 M_w 6.2 Northern Nagano, central Japan, earthquake

Imanishi

Uchide

2017

Geophysical Research Letters

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Foreshocks are considered as part of the preparation process for large earthquakes and, as such, can provide important constraints on earthquake generation. We examine the characteristics of the 4 day long foreshock sequence of the 2014 Northern Nagano earthquake (Mw 6.2) using seismograms recorded by a dense seismic observation network including data from a deep borehole closest to the foreshock region. The improved earthquake catalog shows a slow‐speed migration of the sequence toward the main shock hypocenter, implying possible slow‐slip transients which should have caused stress loading at the main shock hypocenter. An analysis of source spectra reveals that foreshocks for Mw < 1.5 display a weaker dependence of corner frequency on magnitude than expected for self‐similar scaling, suggesting that these microforeshocks can be regarded as small low‐frequency earthquakes. So far, we might have missed the expected weak low‐frequency preseismic signals, because they emerge only below a certain magnitude and are generally embedded in background noise.

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“…Shearer et al 2006;Allmann & Shearer 2007;Oth et al 2010), yet studies on single seismic sequences often provide indications that smaller events have lower stress drops than larger ones (e.g. Mayeda & Malagnini 2010;Mereu et al 2013;Malagnini et al 2014). For the Colfiorito (1997Colfiorito ( -1998 and L'Aquila (2009) seismic sequences, Malagnini et al (2008Malagnini et al ( , 2011 found a clear departure from self-similarity, given by stress drops around 22 MPa for the largest events (M w 6.0) and around 5 MP for smaller magnitudes (e.g.…”

Section: Source Scaling Of the L'aquila Sequencementioning

confidence: 99%

Spectral models for ground motion prediction in the L'Aquila region (central Italy): evidence for stress-drop dependence on magnitude and depth

et al. 2015

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Scaling Transition in Earthquake Sources: A Possible Link Between Seismic and Laboratory Measurements

Cited by 34 publications

References 62 publications

Earthquake stress via event ratio levels: Application to the 2011 and 2016 Oklahoma seismic sequences

Earthquake stress via event ratio levels: Application to the 2011 and 2016 Oklahoma seismic sequences

Non‐self‐similar source property for microforeshocks of the 2014 M_w 6.2 Northern Nagano, central Japan, earthquake

Spectral models for ground motion prediction in the L'Aquila region (central Italy): evidence for stress-drop dependence on magnitude and depth

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Scaling Transition in Earthquake Sources: A Possible Link Between Seismic and Laboratory Measurements

Cited by 34 publications

References 62 publications

Earthquake stress via event ratio levels: Application to the 2011 and 2016 Oklahoma seismic sequences

Earthquake stress via event ratio levels: Application to the 2011 and 2016 Oklahoma seismic sequences

Non‐self‐similar source property for microforeshocks of the 2014 Mw 6.2 Northern Nagano, central Japan, earthquake

Spectral models for ground motion prediction in the L'Aquila region (central Italy): evidence for stress-drop dependence on magnitude and depth

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Non‐self‐similar source property for microforeshocks of the 2014 M_w 6.2 Northern Nagano, central Japan, earthquake