Mantle transition zone beneath Eurasia

Vinnik, Lev; Kosarev, G. L.; Petersen, N.

doi:10.1029/96gl01261

Cited by 39 publications

(27 citation statements)

References 15 publications

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“…This may be why the '660-km' discontinuity is not depressed even though there is a HVA in the transition zone in the same region. Vinnik et al (1996) stack seismograms recorded by the easternmost Russia and 3 CDSN stations (BJI, HIA and MDJ) to detect the P d s. The 30 km depression of the '660-km' discontinuity near BJI suggested by this study is absent in their result. The discrepancy is likely due to the lower lateral resolution of their study.…”

Section: Resultsmentioning

confidence: 61%

“…The discrepancy is likely due to the lower lateral resolution of their study. Vinnik et al (1996) stack all seismograms recorded by all the stations located in a region of ∼1000 km by 2000 km, which may be regarded as the size of lateral resolution. On the other hand, we stack seismograms recorded in a single station and the P-to-S conversion points are located in a much smaller region (Fig.…”

Section: Resultsmentioning

confidence: 99%

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Determination of the absolute depths of the mantle transition zone discontinuities beneath China: Effect of stagnant slabs on transition zone discontinuities

Niu

Kawakatsu

2014

Earth Planet Sp

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Broadband seismic waveform data are stacked to investigate the mantle discontinuities beneath a station. A polarized filter is devised to remove pseudo-signals in the stacked traces, which might be otherwise misinterpreted as a discontinuity. The depth of a mantle discontinuity determined in previous studies depends on the reference model. We suggest the use of data sets which have a range of epicentral distances to the investigated station. The observed travel time of the P-to-S converted phases as a function of epicentral distance can be used to constrain the proper reference model. When the technique is applied to real data, we can determine the absolute depth of a discontinuity with an accuracy of approximately ±10 km. The method is applied to the broadband data of the CDSN stations. There is no significant depression observed for any of the stations except BJI, implying that the lateral scale of the trough in the '660-km' discontinuity under northeast China is smaller than suggested in previous SS precursors studies. Beneath station BJI, the '410-km' and '660-km' discontinuities are elevated 10 km and depressed 30 km, respectively, resulting in an extremely thick transition zone. This may be attributed to the cold pacific plate that exists in the transition zone of the same region. Meanwhile, at station MDJ, where the subducted pacific plate is also found in the mantle transition zone, a multiple-discontinuity structure is observed rather than a depressed '660-km' discontinuity. At station SSE, there is no depression of the '660-km' discontinuity, suggesting that there is no significant difference of temperature at depths around 660 km between SSE and the average mantle.

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Section: Resultsmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 99%

Determination of the absolute depths of the mantle transition zone discontinuities beneath China: Effect of stagnant slabs on transition zone discontinuities

Niu

Kawakatsu

2014

Earth Planet Sp

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“…First, contrary to the point source, the waveforms of S radiated upward from the actual source can be different from those radiated downward and adopted for deconvolution. Second, as documented by Vinnik et al (1996) in easternmost Eura- Fig. 12.…”

Section: Discussionmentioning

confidence: 99%

Broadband converted phases from midmantle discontinuities

2014

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A technique for detecting intermediate-period (6-12 s) Sd P phases converted from S to P at a depth d in the source region is described. Previously, these phases were detected in short-period array recordings of deep events. The main idea of our technique is to deconvolve the vertical component of a single record by the S waveform, and to stack the deconvolved components of a number of records, with appropriate time-shift corrections accounting for the difference of epicentral distance. Using this technique, the phases converted from discontinuities at around 660 km, 860 km, 1070 km, and 1170 km depths beneath Sunda arc are detected at seismograph stations in central and eastern Asia. Our data on '1070 km' discontinuity are very consistent with those inferred from short-period recordings of the same events at the J-array in Japan (Niu and Kawakatsu, 1997), but favour a few different discontinuities in the midmantle, rather than one with a strongly variable depth. When compared with a tomographic model of the mantle for the same region, our data suggest that '1070 km' discontinuity may act as a barrier for the downgoing lithospheric slabs.

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“…The most robust characteristic used in P ds phase identification is observation of the correct moveout associated with a Pds wave [e.g., Vinnik et al, 1996;Paulssen, 1988;Bostock, 1996]. This moveout can be directly observed by plotting all of our seismograms with respect to ray parameter ( Figure 5).…”

Section: Observation Of Pds Moveoutmentioning

confidence: 99%

Mantle discontinuity structure from midpoint stacks of converted P to S waves across the Yellowstone hotspot track

Dueker¹,

Sheehan²

1997

J. Geophys. Res.

450

312

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Abstract. Analysis of a deployment of broadband sensors along a 500-km-long line crossing the Yellowstone hotspot track (YHT) has provided 423 in-plane receiver functions with which to image lateral variations in mantle discontinuity structure. Imaging is accomplished by performing the converted wave equivalent of a common midpoint stack, which significantly improves resolution of mantle discontinuity structure with respect to single-station stacks. Timing corrections are calculated from locally derived tomographic P and $ wave velocity images and applied to the Pds (where d is the depth of the conversion) ray set in order to isolate true discontinuity topography. Using the one-dimensional

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Mantle transition zone beneath Eurasia

Cited by 39 publications

References 15 publications

Determination of the absolute depths of the mantle transition zone discontinuities beneath China: Effect of stagnant slabs on transition zone discontinuities

Determination of the absolute depths of the mantle transition zone discontinuities beneath China: Effect of stagnant slabs on transition zone discontinuities

Broadband converted phases from midmantle discontinuities

Mantle discontinuity structure from midpoint stacks of converted P to S waves across the Yellowstone hotspot track

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