Global trench migration velocities and slab migration induced upper mantle volume fluxes: Constraints to find an Earth reference frame based on minimizing viscous dissipation

Schellart, Wouter P.; Stegman, D. R.; Freeman, Justin

doi:10.1016/j.earscirev.2008.01.005

Cited by 190 publications

(267 citation statements)

References 148 publications

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“…The rates of the plates between these zones are presumed to be constant. If we assume that the Asia is fixed in respect to the lower mantle, the entire system including Philippine Sea and Pacific Plates moves westward, as predicted by Schellart et al (2008). In this case, the fastest Pacific Plate moves at a rate of 12 cm yr −1 .…”

Section: Scenario #2mentioning

confidence: 87%

“…In this segment of the arc the trench is though to migrate forward (Schellart et al, 2008, Miller et al, 2006 which is probably caused by the presence of the large igneous Ogasawara Plateau. It is possible that this plateau increased the strength of the lithosphere and made it more buoyant.…”

Section: Scenario #1mentioning

confidence: 97%

“…There are many studies showing the evidence of eastward displacement of the Mariana segment of the trench (Seno and Maruyama, 1984;Seno et al, 1993;Hall et al, 1995aHall et al, , 1995bHall, 2002). Alternatively, the westward displacement of the trench is shown by (Carlson and Mortera-Gutierrez, 1990;Schellart et al, 2008;O'Neill et al, 2005;Kreemer et al, 2003;Gripp and Gordon, 2002). It was shown, by several authors, that the trench had several stages of migration at different phases of developing this subduction zone.…”

Section: 3 Kinematics Of Ibm Areamentioning

confidence: 97%

“…On the other hand, there are several frames based on different reference points which provide considerably different absolute rates of the plate motions in the IBM region. For example, Schellart et al (2008) presents an overview of plate motions related to three reference frames which are related to different geological structures. Based on all these frames, they report a westward absolute displacement for the Mariana subduction of both subducting and overriding plates at the rates of 11.8-5 cm yr −1 , 8.1 -1.8 cm yr −1 and 7.1 -1.5 cm yr −1 , respectively.…”

Section: 3 Kinematics Of Ibm Areamentioning

confidence: 99%

“…To estimate the total displacement balance between the Pacific Plate and Asia, we need to consider the entire Philippine Plate including the Ryukyu subduction zone and the Okinawa backarc spreading in the west. The indicated velocities are compiled from different studies including (Suppe J., 1984;Sdrolias et al, 2006;Schellart et al, 2008;Hsu et al, 2012). For the northern part of the IBM system (Section A1-A2 in Fig.…”

Section: Scenario #2mentioning

confidence: 99%

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Segmentation of the Izu-Bonin and Mariana slabs based on the analysis of the Benioff seismicity distribution and regional tomography results

2013

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Abstract. We present a new model of P and S velocity anomalies in the mantle down to a depth of 1300 km beneath the Izu-Bonin and Mariana (IBM) arcs. This model is derived based on tomographic inversion of global travel time data from the revised ISC catalogue. The results of inversion are thoroughly verified using a series of different tests. The obtained model is generally consistent with previous studies by different authors. We also present the distribution of relocated deep events projected to the vertical surface along the IBM arc system. Unexpectedly, the seismicity forms elongated vertical clusters instead of horizontal zones indicating phase transitions in the slab. We propose that these vertical seismicity zones mark zones of intense deformation and boundaries between semi-autonomous segments of the subducting plate. The P and S seismic tomography models consistently display the slab as prominent high-velocity anomalies coinciding with the distribution of deep seismicity. We can distinguish at least four segments which subduct differently. The northernmost segment of the Izu-Bonin arc has the gentlest angle of dipping which is explained by backward displacement of the trench. In the second segment, the trench stayed at the same location, and we observe the accumulation of the slab material in the transition zone and its further descending to the lower mantle. In the third segment, the trench is moving forward causing the steepening of the slab. Finally, for the Mariana segment, despite the backward displacement of the arc, the subducting slab is nearly vertical. Between the Izu-Bonin and Mariana arcs we clearly observe a gap which can be traced down to about 400 km in depth. Based on joint consideration of the tomography results and the seismicity distribution, we propose two different scenarios of the subduction evolution in the IBM zone during the recent time, depending on the reference frame of plate displacements. In the first case, we consider the movements in respect to the Philippine Plate, and explain the different styles of the subduction by the relative backward and forward migrations of the trench. In the second case, all the elements of the subduction system move westward in respect to the stable Asia. Different subduction styles are explained by the "anchoring" of selected segments of the slab, different physical properties of the subducting plate and the existence of buoyant rigid blocks related to sea mount and igneous provinces.

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Section: Scenario #2mentioning

confidence: 87%

Section: Scenario #1mentioning

confidence: 97%

Section: 3 Kinematics Of Ibm Areamentioning

confidence: 97%

Section: 3 Kinematics Of Ibm Areamentioning

confidence: 99%

Section: Scenario #2mentioning

confidence: 99%

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Segmentation of the Izu-Bonin and Mariana slabs based on the analysis of the Benioff seismicity distribution and regional tomography results

2013

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Subducted slabs stagnant above, penetrating through, and trapped below the 660 km discontinuity

2013

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[1] A new P wave tomographic model of the mantle was constructed using more than 10 million travel times. The finite-frequency effect of seismic rays was taken into account by calculating banana-donut kernels at 2 Hz for all first arrival time data, and at 0.1 Hz for broadband differential travel time data. Based on this model, a systematic survey for subducted slab images was developed for the circum-Pacific; including the Kurile, Honshu, Izu-Bonin, Mariana, Java, Tonga-Kermadec, southern and northern South America, and Central America, arcs. This survey revealed a progressive lateral variation of the configuration of slabs along arc(s), which we interpret as an indication for successive stages of slab subduction through the Bullen's transition region with the 660 km discontinuity at the middle. We identified the four distinct stages: I -slab stagnant above the 660 km discontinuity; II -slab penetrating the 660 km discontinuity; III -slab trapped in the uppermost lower mantle (at a depth of 660-1000 km); and IV -slab descending well into the deep lower mantle. The majority of slab images are found to be either at Stage I or III, suggesting that Stages I and III are relatively stable or neutral and II and IV are relatively unstable or transient. There is a remarkable distinction for the deepest hypocentral distribution between slabs at Stage I and slabs at Stages II or III.Citation: Fukao, Y., and M. Obayashi (2013), Subducted slabs stagnant above, penetrating through, and trapped below the 660 km discontinuity,

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A geodetic plate motion and Global Strain Rate Model

Kreemer

Blewitt

Klein

2014

Geochem. Geophys. Geosyst.

782

785

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We present a new global model of plate motions and strain rates in plate boundary zones constrained by horizontal geodetic velocities. This Global Strain Rate Model (GSRM v.2.1) is a vast improvement over its predecessor both in terms of amount of data input as in an increase in spatial model resolution by factor of $2.5 in areas with dense data coverage. We determined 6739 velocities from time series of (mostly) continuous GPS measurements; i.e., by far the largest global velocity solution to date. We transformed 15,772 velocities from 233 (mostly) published studies onto our core solution to obtain 22,511 velocities in the same reference frame. Care is taken to not use velocities from stations (or time periods) that are affected by transient phenomena; i.e., this data set consists of velocities best representing the interseismic plate velocity. About 14% of the Earth is allowed to deform in 145,086 deforming grid cells (0.25 longitude by 0.2 latitude in dimension). The remainder of the Earth's surface is modeled as rigid spherical caps representing 50 tectonic plates. For 36 plates we present new GPS-derived angular velocities. For all the plates that can be compared with the most recent geologic plate motion model, we find that the difference in angular velocity is significant. The rigid-body rotations are used as boundary conditions in the strain rate calculations. The strain rate field is modeled using the Haines and Holt method, which uses splines to obtain an self-consistent interpolated velocity gradient tensor field, from which strain rates, vorticity rates, and expected velocities are derived. We also present expected faulting orientations in areas with significant vorticity, and update the no-net rotation reference frame associated with our global velocity gradient field.Finally, we present a global map of recurrence times for M w 57.5 characteristic earthquakes.

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Global trench migration velocities and slab migration induced upper mantle volume fluxes: Constraints to find an Earth reference frame based on minimizing viscous dissipation

Cited by 190 publications

References 148 publications

Segmentation of the Izu-Bonin and Mariana slabs based on the analysis of the Benioff seismicity distribution and regional tomography results

Segmentation of the Izu-Bonin and Mariana slabs based on the analysis of the Benioff seismicity distribution and regional tomography results

Subducted slabs stagnant above, penetrating through, and trapped below the 660 km discontinuity

A geodetic plate motion and Global Strain Rate Model

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