GOCE derived vertical gravity gradient delineates great earthquake rupture zones along the Chilean margin

Álvarez, Orlando; Nacif, Silvina; Giménez, Mario; Folguera, Andrés; Braitenberg, Carla

doi:10.1016/j.tecto.2014.03.011

Cited by 44 publications

(44 citation statements)

References 104 publications

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“…Previous studies revealed a correlation between coseismic slip areas and structural heterogeneities in some megathrust zones, such as Tohoku, South Kuril, and Chile [e.g., Zhao et al, 2011;Huang and Zhao, 2013b;Liu et al, 2013aLiu et al, , 2014Álvarez et al, 2014;Moreno et al, 2014]. However, our present result shows that the rupture zones of the 1946 Nankai (M w 8.3) and the 1944 Tonankai (M w 8.1) earthquakes were not limited in the high-V, high-Q, and low-σ patches (i.e., strongly coupled areas or asperities), where they are apt to nucleate, but extended beyond those patches (Figure 3).…”

Section: Discussionmentioning

confidence: 99%

Structural control on the nucleation of megathrust earthquakes in the Nankai subduction zone

Liu

Zhao

2014

Geophysical Research Letters

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To clarify the causal mechanisms of megathrust earthquakes, we studied the detailed three-dimensional P and S wave velocities (V), attenuation (Q), and Poisson's ratio (σ) structures of the Nankai subduction zone in southwest Japan, using a large number of high-quality arrival time and t* data measured precisely from seismograms of local earthquakes. The suboceanic earthquakes used are relocated precisely using sP depth phase and ocean bottom seismometer data. Our results show the existence of two prominent high-V, high-Q, and low-σ patches separated by low-V, low-Q, and high-σ anomalies in the Nankai megathrust zone. Megathrust earthquakes during 1900 to 2013 nucleated in or around the high-V, high-Q, and low-σ patches, which may represent strongly coupled areas (i.e., asperities) in the megathrust zone. Our results indicate that structural heterogeneities in the megathrust zone, such as the subducting seafloor topography and compositional variations, control the nucleation of the Nankai megathrust earthquakes.

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Section: Discussionmentioning

confidence: 99%

Structural control on the nucleation of megathrust earthquakes in the Nankai subduction zone

Liu

Zhao

2014

Geophysical Research Letters

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“…This segment of the margin corresponds to the northern portion of the rupture area associated to the Chilean 2010 megathrust earthquake (Maule Mw8.8 earthquake). The rupture area (from ∼34 • S to ∼38 • S) covered a seismic gap that had not experienced a large earthquake since 1835 and 1928 (Lomnitz, 1971;Ruegg et al, 2009) and extended from the northern limit of the Valdivia 1960 Mw9.5 earthquake (e.g., Barrientos and Ward, 1990) to the southern limit of the 1985 Mw7.8 earthquake (Comte et al, 1986).…”

Section: Seismotectonic Settingmentioning

confidence: 99%

“…In addition, along-strike inhomogeneities in slip distribution during earthquakes have been associated in many places with the presence of subducted oceanic features (seamounts, ridges, fracture zones and the crustal faulting of the slab), which may act as barriers and/or asperities on the seismogenic contact (e.g. Aki, 1979;Cloos, 1992;Das and Watts, 2009;Sparkes et al, 2010;Contreras-Reyes and Carrizo, 2011;Muller and Landgrebe, 2012;Álvarez et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Density-depth model of the continental wedge at the maximum slip segment of the Maule Mw8.8 megathrust earthquake

Maksymowicz

Tréhu

Contreras‐Reyes

et al. 2015

Earth and Planetary Science Letters

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“…Fuchs et al (2013) found the coseismic signal of the 2011 Tohoku earthquake using the GOCEmeasured vertical gravity gradients at the satellite orbit height. Alvarez et al (2014) demonstrated the correlation between the vertical gravity gradient calculated from the GOCE gravity model with the coseismic slip distribution for the 2010 Maule earthquake.…”

Section: Introductionmentioning

confidence: 84%

The effect of Earth's oblateness on the seismic moment estimation from satellite gravimetry

Chang-lei

Guo

Shang

et al. 2018

Geophysical Journal International

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Over the last decade, satellite gravimetry, as a new class of geodetic sensors, has been increasingly studied for its use in improving source model inversion for large undersea earthquakes. When these satellite-observed gravity change data are used to estimate source parameters such as seismic moment, the forward modelling of earthquake seismic deformation is crucial because imperfect modelling could lead to errors in the resolved source parameters. Here, we discuss several modelling issues and focus on one modelling deficiency resulting from the upward continuation of gravity change considering the Earth's oblateness, which is ignored in contemporary studies. For the low degree (degree 60) time-variable gravity solutions from Gravity Recovery and Climate Experiment mission data, the model-predicted gravity change would be overestimated by 9 per cent for the 2011 Tohoku earthquake, and about 6 per cent for the 2010 Maule earthquake. For high degree gravity solutions, the model-predicted gravity change at degree 240 would be overestimated by 30 per cent for the 2011 Tohoku earthquake, resulting in the seismic moment to be systematically underestimated by 30 per cent.

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GOCE derived vertical gravity gradient delineates great earthquake rupture zones along the Chilean margin

Cited by 44 publications

References 104 publications

Structural control on the nucleation of megathrust earthquakes in the Nankai subduction zone

Structural control on the nucleation of megathrust earthquakes in the Nankai subduction zone

Density-depth model of the continental wedge at the maximum slip segment of the Maule Mw8.8 megathrust earthquake

The effect of Earth's oblateness on the seismic moment estimation from satellite gravimetry

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