Tidal Modulation of Nonvolcanic Tremor

Rubinstein, Justin L.; Rocca, Mario La; Vidale, John E.; Creager, K. C.; Wech, A.

doi:10.1126/science.1150558

Cited by 245 publications

(219 citation statements)

References 26 publications

(30 reference statements)

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“…Similar episodic slip involving tremor has been also observed in the Cascadia subduction zone (e.g., Rogers and Dragert, 2003;Kao et al, 2006;Schwartz and Rokosky, 2007). Both in southwest Japan and the Cascadia region, remote triggering of small lowfrequency seismic tremor at depths of ∼30 km or shallower by surface waves from large distant earthquakes, has been reported in several recent studies (Obara, 2003;Mori, 2005, 2006;Rubinstein et al, 2007Rubinstein et al, , 2008aMiyazawa and Brodsky, 2008), and the triggering from earth tides is also found (Rubinstein et al, 2008b;Nakata et al, 2008).…”

Section: Introductionsupporting

confidence: 70%

Learning from dynamic triggering of low-frequency tremor in subduction zones

2008

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Remote triggering of small low-frequency seismic tremor (non-volcanic tremor) near the seismic-aseismic transition zone of subduction zones, by surface waves from large distant earthquakes, has been reported in southwest Japan and the Cascadia region. Recent observed triggering in southwest Japan from three large earthquakes (2003 Tokachi-oki, 2007 Solomon, and 2008 Wenchuan) covering wide azimuthal information provides strong evidence for the influence of fluids in the source area. The Coulomb failure stress analyses suggest the effective friction coefficient is large for southwest Japan and small for the Cascadia region, which could be related to the amount of fluid in the source regions of the low-frequency tremor.

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Section: Introductionsupporting

confidence: 70%

Learning from dynamic triggering of low-frequency tremor in subduction zones

2008

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“…The low effective normal stresses are consistent with the triggering and modulation of tremor by small dynamic stresses such as passing surface waves (Rubinstein et al, 2007) and tidal stresses (Royer et al, 2015;Rubinstein et al, 2008), as well as numerical modeling of slow slip (Liu and Rice, 2007;Rubin, 2008;Segall et al, 2010). Based on the spatial correspondence between the LVZ and the slow earthquake source region, it is tempting to conjecture that high pore-fluid pressures inferred from elevated Vp/Vs values are responsible for deep episodic slow earthquake activity.…”

Section: Accepted M Manuscriptmentioning

confidence: 52%

Teleseismic constraints on the geological environment of deep episodic slow earthquakes in subduction zone forearcs: A review

2016

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More than a decade after the discovery of deep episodic slow slip and tremor, or slow earthquakes, at subduction zones, much research has been carried out to investigate the structural and seismic properties of the environment in which they occur. Slow earthquakes generally occur on the megathrust fault some distance downdip of the great earthquake seismogenic zone in the vicinity of the mantle wedge corner, where three major structural elements are in contact: the subducting oceanic crust, the overriding forearc crust and the continental mantle. In this region, thermo-petrological models predict significant fluid production from the dehydrating oceanic crust and mantle due to prograde metamorphic reactions, and their consumption by hydrating the mantle wedge. These fluids are expected to affect the dynamic stability of the megathrust fault and enable slow slip by increasing pore-fluid pressure and/or reducing friction in fault gouges.Resolving the fine-scale structure of the deep megathrust fault and the in situ distribution of fluids where slow earthquakes occur is challenging, and most advances have been made using A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPTteleseismic scattering techniques (e.g., receiver functions). In this paper we review the teleseismic structure of six well-studied subduction zones (three hot, i.e., Cascadia, southwest Japan, central Mexico, and three cool, i.e., Costa Rica, Alaska, and Hikurangi) that exhibit slow earthquake processes and discuss the evidence of structural and geological controls on the slow earthquake behavior. We conclude that changes in the mechanical properties of geological materials downdip of the seismogenic zone play a dominant role in controlling slow earthquake behavior, and that near-lithostatic pore-fluid pressures near the megathrust fault may be a necessary but insufficient condition for their occurrence.

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“…Pressure variations in north-south direction (Fig. 4) are detectable by tremors variations in diurnal 24 h 50.4 min periods in Cascadia region (Rubinstein et al 2008).…”

Section: Correlation Of Tidal Forces With Earthquakesmentioning

confidence: 96%

Tides as drivers of plates and criticism of mantle convection

Ostrihansky

2015

Acta Geod Geophys

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Forces moving plates are of two kinds: Force moving plates to the north and force moving plates to the west. They are both, by their origin, related to tidal forces but they act in quite different way. The northward force acts by its center in meridian, the westward force acts in direction of geographic parallels. Tidal forces of semidiurnal and diurnal periods cannot move plates because triggering of earthquakes by the stress of these amplitudes gives statistically insignificant results confirmed by many reports for more than 100 years. However the tidal forces acting on 10 km Earth's rotation bulges and the periodic Earth's deformations resulting in Earth's rotation variations give strong forces energetically equivalent to energy of large earthquakes. Oceanic lithosphere older than 180 M.Y. drops down to the mantle by gravity or is liquidated being overridden beneath continent. At that movement the released space facilitates the plate movement by tides. Hotspots firmly anchored in mantle show by tracks an exact movement of plates. Mantle convection is disregarded because it contradicts to existence of mid-ocean ridges triple junctions. Not Polfluchtkraft but Äquatorkraft force the tides create, which can move the large continent (for example Gondwana) far from equator as far as the pole, where after decay the Antarctica remains being out of tidal forces actions.

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Tidal Modulation of Nonvolcanic Tremor

Cited by 245 publications

References 26 publications

Learning from dynamic triggering of low-frequency tremor in subduction zones

Learning from dynamic triggering of low-frequency tremor in subduction zones

Teleseismic constraints on the geological environment of deep episodic slow earthquakes in subduction zone forearcs: A review

Tides as drivers of plates and criticism of mantle convection

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