Scaling Relations of Earthquake Source Parameter Estimates with Special Focus on Subduction Environment

Blaser, Lilian; Krüger, Frank; Ohrnberger, Matthias; Scherbaum, Frank

doi:10.1785/0120100111

Cited by 354 publications

(365 citation statements)

References 51 publications

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“…3, panel B where red colours indicate regions where CSS exceeds the TA model of 14 months. Although the TA model should be larger than SA the scaling relations of Blaser et al (2010) (Fig. S5) imply that single aftershocks with magnitudes larger than M w ≥ 5 exceed ∼20 cm slip which is in most places larger than at Geoforschungszentrum Potsdam on September 11, 2014 http://gji.oxfordjournals.org/ Downloaded from the TA estimated by inverting GPS data.…”

Section: Methods 1: Relating Css To Ta and The Different Spatial Resolmentioning

confidence: 86%

“…S5). We calculate the rupture areas (A) of aftershocks using the scaling relations of Blaser et al (2010) for subduction zone environment and thrust events based on an event range from M w = 6.1 to 9.5. These scaling relations are similar to the scaling relations of Wells & Coppersmith (1994).…”

Section: Representation Of Seismicity Using the Cumulative Seismic Slmentioning

confidence: 99%

“…The scatter of the data set on which the scaling relations are based indicates that rupture areas for earthquakes of the same magnitude can vary by up to a factor of 5 in the moment magnitude range between 6 and 7 (Blaser et al 2010) and the estimated slip values will vary accordingly. Since the scaling relations are the result of a regression analysis, which results in a curve roughly in the middle of this range, this would only account for an exceedance of ∼2.2 times the afterslip if we assume that the aftershocks of the Nias 2005 events are exclusively on the upper bound of the magnitude-area distribution.…”

Section: Application To 2011 Tohoku and 2005 Nias Earthquakesmentioning

confidence: 99%

“…Figure S5. Scaling relations from (thick lines, Blaser et al 2010, optimized for subduction zones) and (thin lines Wells and Coppersmith 1994, thrust events). The scaling relation is shown for the calculated slip (using a shear modulus of μ = 35GPa) and the total rupture area.…”

Section: S U P P O Rt I N G I N F O R M At I O Nmentioning

confidence: 99%

“…First, we calculate maps of cumulative seismic slip (CSS) estimated from earthquake catalogues using scaling relations (e.g. Wells & Coppersmith 1994;Blaser et al 2010). These relations allow us to estimate the rupture size on the basis of earthquake moment magnitudes (M w ) for individual events, which in turn allows us to calculate the average slip in the rupture area (Kanamori 1977).…”

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confidence: 99%

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Comparison of postseismic afterslip models with aftershock seismicity for three subduction-zone earthquakes: Nias 2005, Maule 2010 and Tohoku 2011

Lange¹,

Bedford²,

Moreno³

et al. 2014

Geophysical Journal International

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Section: Methods 1: Relating Css To Ta and The Different Spatial Resolmentioning

confidence: 86%

Section: Representation Of Seismicity Using the Cumulative Seismic Slmentioning

confidence: 99%

Section: Application To 2011 Tohoku and 2005 Nias Earthquakesmentioning

confidence: 99%

Section: S U P P O Rt I N G I N F O R M At I O Nmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Comparison of postseismic afterslip models with aftershock seismicity for three subduction-zone earthquakes: Nias 2005, Maule 2010 and Tohoku 2011

Lange¹,

Bedford²,

Moreno³

et al. 2014

Geophysical Journal International

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Crustal earthquake triggering by modern great earthquakes on subduction zone thrusts

Gomberg

Sherrod

2014

J. Geophys. Res. Solid Earth

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Among the many questions raised by the recent abundance of great (M > 8.0) subduction thrust earthquakes is their potential to trigger damaging earthquakes on crustal faults within the overriding plate and beneath many of the world's densely populated urban centers. We take advantage of the coincident abundance of great earthquakes globally and instrumental observations since 1960 to assess this triggering potential by analyzing centroids and focal mechanisms from the centroid moment tensor catalog for events starting in 1976 and published reports about the M9.5 1960 Chile and M9.2 1964 Alaska earthquake sequences. We find clear increases in the rates of crustal earthquakes in the overriding plate within days following all subduction thrust earthquakes of M > 8.6, within about ±10°of the triggering event centroid latitude and longitude. This result is consistent with dynamic triggering of more distant increases of shallow seismicity rates at distances beyond ±10°, suggesting that dynamic triggering may be important within the near field too. Crustal earthquake rate increases may also follow smaller M > 7.5 subduction thrust events, but because activity typically occurs offshore in the immediately vicinity of the triggering rupture plane, it cannot be unambiguously attributed to sources within the overriding plate. These observations are easily explained in the context of existing earthquake scaling laws.

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The seismic cycle at subduction thrusts: Insights from seismo‐thermo‐mechanical models

et al. 2013

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[1] The underestimation of the size of recent megathrust earthquakes illustrates our limited understanding of their spatiotemporal occurrence and governing physics. To unravel their relation to associated subduction dynamics and long-term deformation, we developed a 2-D continuum viscoelastoplastic model that uses an Eulerian-Lagrangian finite difference framework with similar on-and off-fault physics. We extend the validation of this numerical tool to a realistic subduction zone setting that resembles Southern Chile. The resulting quasi-periodic pattern of quasi-characteristic M8-M9 megathrust events compares quantitatively with observed recurrence and earthquake source parameters, albeit at very slow coseismic speeds. Without any data fitting, surface displacements agree with GPS data recorded before and during the 2010 M8.8 Maule earthquake, including the presence of a second-order flexural bulge. These surface displacements show cycle-to-cycle variations of slip deficits, which overall accommodate 5% of permanent internal shortening. We find that thermally (and stress) driven creep governs a spontaneous conditionally stable downdip transition zone between temperatures of 350 ı C and 450 ı C. Ruptures initiate above it (and below the forearc Moho), propagate within it, interspersed by small intermittent events, and arrest below it as ductile shearing relaxes stresses. Ruptures typically propagate upward along lithological boundaries and widen as pressures drop. The main thrust is constrained to be weak due to fluid-induced weakening required to sustain regular subduction and to generate events with natural characteristics (fluid pressures of 75-99% of solid pressures). The agreement with a range of seismological, geodetic, and geological observations demonstrates the validity and strength of this physically consistent seismo-thermo-mechanical approach.

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Scaling Relations of Earthquake Source Parameter Estimates with Special Focus on Subduction Environment

Cited by 354 publications

References 51 publications

Comparison of postseismic afterslip models with aftershock seismicity for three subduction-zone earthquakes: Nias 2005, Maule 2010 and Tohoku 2011

Comparison of postseismic afterslip models with aftershock seismicity for three subduction-zone earthquakes: Nias 2005, Maule 2010 and Tohoku 2011

Crustal earthquake triggering by modern great earthquakes on subduction zone thrusts

The seismic cycle at subduction thrusts: Insights from seismo‐thermo‐mechanical models

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