Static and Dynamic Scaling Relations for Earthquakes and Their Implications for Rupture Speed and Stress Drop

Kanamori, Hiroo

doi:10.1785/0120030159

Cited by 193 publications

(178 citation statements)

References 27 publications

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“…We computed the source parameters of the major events of two seismic sequences, scaling relation of Kanamori and Rivera (2004), as discussed in Franceschina et al (2005).…”

Section: Discussionmentioning

confidence: 99%

Source parameters and stress release of seismic sequences occurred in the Friuli-Venezia Giulia region (Northeastern Italy) and in Western Slovenia

Bressan¹,

Kravanja²,

Franceschina³

2007

Physics of the Earth and Planetary Interiors

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“…We computed the source parameters of the major events of two seismic sequences, scaling relation of Kanamori and Rivera (2004), as discussed in Franceschina et al (2005).…”

Section: Discussionmentioning

confidence: 99%

Source parameters and stress release of seismic sequences occurred in the Friuli-Venezia Giulia region (Northeastern Italy) and in Western Slovenia

Bressan¹,

Kravanja²,

Franceschina³

2007

Physics of the Earth and Planetary Interiors

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“…) range from 0.1 to 1 of E R /M 0 for large events (M W 7) [Kanamori and Rivera, 2004]. This implies that a lower bound of that for given M 0 and f c may decrease with M 0 and suggest that the scaling relation needs to be modified to M 0 / f c À(3+e) (e 1).…”

Section: à5mentioning

confidence: 99%

Seismic scaling relations and aftershock activity from the sequences of the 2004 mid Niigata and the 2005 west off Fukuoka earthquakes (M_W 6.6) in Japan

Tajima¹,

Tajima²

2007

J. Geophys. Res.

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[1] We investigate seismic scaling relations and seismic activity using two Japanese earthquake sequences, the 2004 mid Niigata prefecture earthquake (MNPE) and the 2005 west off Fukuoka prefecture earthquake (WOFE) sequences. Although the mainshocks of the two sequences have the same M W of 6.6, the aftershock activities are different from each other in term of moment release. The MNPE produced a large number of aftershocks including six events with M W ! 5.5 over a period of about two weeks. On the other hand, the WOFE sequence did not produce aftershocks that exceeded M W 5.5. In the scaling relationship of seismic moment (M 0 ) versus corner frequency ( f c ) obtained from the MNPE sequence, the f c 's tend to decrease with decreasing M 0 between M W 3.5 and 6.6 and the best fit line determined in a least squares sense is M 0 / f c À3.41 . In the WOFE sequence, the best fit line is M 0 / f c À3.06 in the same M W range. The f c range of small aftershocks is lower in the MNPE sequence than in the WOFE sequence. Moreover, the M 0 À f c relations for small events (3.5 M W 4.0) in the MNPE sequence are different between the events on the main faults (M 0 / f c À3.53 ) and the off-main fault events (M 0 / f c À4.44 ). These results suggest that there is difference (or variation) in the scaling relation even in the same M W range, probably reflecting different tectonic or seismogenic conditions.

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“…More importantly, the derived stress drops here have taken directivity into account and do not rely on corner frequency estimates that depend on azimuth and source models (Kaneko & Shearer 2015). The derived source parameters such as fault length, rupture velocity, and stress drop can provide valuable data for studying the physics of earthquakes (Kanamori & Rivera 2004). In comparison, the second moment method is another welldeveloped means of utilizing the second-order expansion of the moment tensor to capture overall characteristics of the spatiotemporal rupture distribution (Backus 1997a,b;McGuire et al 2001McGuire et al , 2002Chen et al 2005).…”

Section: Directivity Moment Tensor Inversion 1073mentioning

confidence: 99%

Toward automated directivity estimates in earthquake moment tensor inversion

Huang

Aso

Tsai

2017

Geophysical Journal International

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S U M M A R YRapid estimates of earthquake rupture properties are useful for both scientific characterization of earthquakes and emergency response to earthquake hazards. Rupture directivity is a particularly important property to constrain since seismic waves radiated in the direction of rupture can be greatly amplified, and even moderate magnitude earthquakes can sometimes cause serious damage. Knowing the directivity of earthquakes is important for ground shaking prediction and hazard mitigation, and is also useful for discriminating which nodal plane corresponds to the actual fault plane particularly when the event lacks aftershocks or outcropped fault traces. Here, we propose a 3-D multiple-time-window directivity inversion method through direct waveform fitting, with source time functions stretched for each station according to a given directivity. By grid searching for the directivity vector in 3-D space, this method determines not only horizontal but vertical directivity components, provides uncertainty estimates, and has the potential to be automated in real time. Synthetic tests show that the method is stable with respect to noise, picking errors, and site amplification, and is less sensitive to station coverage than other methods. Horizontal directivity can be properly recovered with a minimum azimuthal station coverage of 180 • , whereas vertical directivity requires better coverage to resolve. We apply the new method to the M w 6.0 Nantou, Taiwan earthquake, M w 7.0 Kumamoto, Japan earthquake, and M w 4.7 San Jacinto fault trifurcation (SJFT) earthquake in southern California. For the Nantou earthquake, we corroborate previous findings that the earthquake occurred on a shallow east-dipping fault plane rather than a west-dipping one. For the Kumamoto and SJFT earthquakes, the directivity results show good agreement with previous studies and demonstrate that the method captures the general rupture characteristics of large earthquakes involving multiple fault ruptures and applies to earthquakes with magnitudes as small as M w 4.7.

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Static and Dynamic Scaling Relations for Earthquakes and Their Implications for Rupture Speed and Stress Drop

Cited by 193 publications

References 27 publications

Source parameters and stress release of seismic sequences occurred in the Friuli-Venezia Giulia region (Northeastern Italy) and in Western Slovenia

Source parameters and stress release of seismic sequences occurred in the Friuli-Venezia Giulia region (Northeastern Italy) and in Western Slovenia

Seismic scaling relations and aftershock activity from the sequences of the 2004 mid Niigata and the 2005 west off Fukuoka earthquakes (M_W 6.6) in Japan

Toward automated directivity estimates in earthquake moment tensor inversion

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Static and Dynamic Scaling Relations for Earthquakes and Their Implications for Rupture Speed and Stress Drop

Cited by 193 publications

References 27 publications

Source parameters and stress release of seismic sequences occurred in the Friuli-Venezia Giulia region (Northeastern Italy) and in Western Slovenia

Source parameters and stress release of seismic sequences occurred in the Friuli-Venezia Giulia region (Northeastern Italy) and in Western Slovenia

Seismic scaling relations and aftershock activity from the sequences of the 2004 mid Niigata and the 2005 west off Fukuoka earthquakes (MW 6.6) in Japan

Toward automated directivity estimates in earthquake moment tensor inversion

Contact Info

Product

Resources

About

Seismic scaling relations and aftershock activity from the sequences of the 2004 mid Niigata and the 2005 west off Fukuoka earthquakes (M_W 6.6) in Japan