Travel times from earthquakes near southern Kuril and their implications for the fate of subducted lithosphere

Glennon, Mary Ann; Chen, Wang‐Ping

doi:10.1016/0031-9201(94)02991-j

Cited by 3 publications

(1 citation statement)

References 36 publications

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“…Several recent studies showed evidence that the extent of slab penetration into the lower mantle seems to vary along subduction zones. Some subducted slabs remain stagnant in the upper mantle [Glennon and Chen, 1995], while others penetrate steeply into the lower mantle Jordan, 1984, 1986]. ever in the southern part of the trench, the Pacific plate directly penetrates into the lower mantle across the 660 km discontinuity.…”

Section: Introductionmentioning

confidence: 99%

Upper mantle transition zone structure beneath the Philippine Sea Region

Shito

Shibutani

2001

Geophysical Research Letters

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Abstract.Seismic structure of the upper mantle transition zone beneath the Philippine Sea region is studied using waveform modeling. Models AZ41 and AZ40 were derived to represent the structure beneath the north central part and northwestern regions, respectively. AZ41 has high-velocity anomalies from 510 km to 660 km 3% faster than a global model ak135, a depression of the '660' discontinuity to 690 km, and a small (+2%) discontinuity at 510 km. Model AZ40 is the same as AZ41 except there is no depression of the '660'. On the other hand, the waveforms which sampled the southern region can be explained with the global model ak135. These results support the interpretation that subducted Pacific lithosphere is stagnant above the '660' in the northern part, whereas in the southern part it penetrates into the lower mantle. In accord with earlier suggestions, the different configuration of the subducted slab suggested above could be due to the migration of the trench.

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Section: Introductionmentioning

confidence: 99%

Upper mantle transition zone structure beneath the Philippine Sea Region

Shito

Shibutani

2001

Geophysical Research Letters

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Morphology of the subducted Indian plate in the Indo-Burmese convergence zone

Srinagesh

Sarma

1996

Proc. Indian Acad. Sci. (Earth Planet Sci.)

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Variations of P wave speeds in the mantle transition zone beneath the northern Philippine Sea

Brudzinski¹,

Chen²,

Nowack³

et al. 1997

J. Geophys. Res.

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Abstract. Using waveforms and travel times from deep earthquakes, we constructed 16 seismic profiles, each of which constrains the radial variation in Vp over a small area beneath the northern Philippine Sea. Taken together, the azimuthal coverage of these profiles also places tight bounds on the lateral extent of a region of anomalously high Vp (up to 3% faster than average Earth models) originally suggested by travel time tomography. Unlike travel time tomography, which relies heavily on arrival times of the direct P phase, we utilize the waveforms and move-out of later arrivals that mainly sample the mantle transition zone of interest. Our results identify three important characteristics of the northern Philippine Sea anomaly that are distinct from previous results. First, being approximately a subhorizontal, laterally uniform feature, the anomaly is localized beneath the northwestern comer of the Philippine Sea, within a region of approximately 500 x 500 km 2 immediately east of the Ryukyu arc. Second, the anomaly is well constrained to occur in the lower portion of the transition zone, extending all the way down to the 660-km discontinuity. Third, the presence of such a distinct anomaly reduces the contrast in V, across the 660-km discontinuity from approximately 6% to 3%. Such a configuration •s consistent wath the interpretanon that the anomaly is caused by a remnant of subducted slab, as negative buoyancy should rest the slab just above the 660-km discontinuity where resistance to subduction is expected from a negative Clapeyron slope during the spinel-Mg-Fe-perovskite transition.

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Travel times from earthquakes near southern Kuril and their implications for the fate of subducted lithosphere

Cited by 3 publications

References 36 publications

Upper mantle transition zone structure beneath the Philippine Sea Region

Upper mantle transition zone structure beneath the Philippine Sea Region

Morphology of the subducted Indian plate in the Indo-Burmese convergence zone

Variations of P wave speeds in the mantle transition zone beneath the northern Philippine Sea

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