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

Dueker, K. G.; Sheehan, A. F.

doi:10.1029/96jb03857

Cited by 444 publications

(318 citation statements)

References 47 publications

(27 reference statements)

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“…Below the Moho, an uppermost mantle V p /V s ratio of 1.81 is assumed, as determined from the AK135 reference earth model [Kennett et al, 1995]. Velocities along the calculated raypaths are used in the one-dimensional moveout equation to map time to depth, and the results are stacked via the common conversion point (CCP) method [Dueker and Sheehan, 1997] to produce velocity images. Subsurface image points are spaced 1 km vertically, and are spaced 8 and 14 km laterally for the P and S wave data, respectively.…”

Section: Scattered Wave Imagingmentioning

confidence: 99%

A rootless rockies—Support and lithospheric structure of the Colorado Rocky Mountains inferred from CREST and TA seismic data

Hansen

Dueker

Stachnik

et al. 2013

Geochem Geophys Geosyst

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[1] Support for the Colorado high topography is resolved using seismic data from the Colorado Rocky Mountain (CRM) Experiment and Seismic Transects. The average crustal thickness, derived from P wave receiver function imaging, is 48 km. However, a negative correlation between Moho depth and elevation is observed, which negates Airy-Heiskanen isostasy. Shallow Moho (<45 km depth) is found beneath some of the highest elevations, and therefore, the CRM are rootless. Deep Moho (45-51 km) regions indicate structure inherited from the Proterozoic assembly of the continent. Shear wave velocities from surface wave tomography are mapped to density employing empirical velocity-to-density relations in the crust and mantle temperature modeling. Predicted elastic plate flexure and gravity fields derived from the density model agree with observed long-wavelength topography and Bouguer gravity. Therefore, lowdensity crust and mantle are sufficient to support much of the CRM topography. Centers of Oligocene volcanism, e.g., the San Juan Mountains, display reduced crustal thicknesses and lowest average crustal velocities, suggesting that magmatic modification strongly influenced modern lithospheric structure and topography. Mantle velocities span 4.02-4.64 km/s at 73-123 km depth, and peak lateral temperature variations of 600 C are inferred. S wave receiver function imaging suggests that the lithosphereasthenosphere boundary is 100-150 km deep beneath the Colorado Plateau, and 150-200 km deep beneath the High Plains. A region of negative arrivals beneath the CRM above 100 km depth correlates with low mantle velocities and is interpreted as thermally modified/metasomatized lithosphere resulting from Cenozoic volcanism.

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Section: Scattered Wave Imagingmentioning

confidence: 99%

A rootless rockies—Support and lithospheric structure of the Colorado Rocky Mountains inferred from CREST and TA seismic data

Hansen

Dueker

Stachnik

et al. 2013

Geochem Geophys Geosyst

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“…The resulting S velocity models from neighboring stations are then compared for geological interpretation. Duecker and Sheehan [1997] have modified the receiver function method by summing traces with common conversion regions. In the present study we have applied another modification of the receiver function method.…”

Section: Introductionmentioning

confidence: 99%

Lithospheric and upper mantle structure of southern Tibet from a seismological passive source experiment

Yuan¹,

Ni²,

Kind³

et al. 1997

J. Geophys. Res.

356

296

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Besides the improved method we also use more data than Kind et al. [1996]. We have added teleseismic recordings of the dense wide-angle German Depth Profiling of Tibet and the Himalayas (GEDEPTH) deployment, which proved to be very successful because of the close spacing of these stations. We have also added data from the permanent broadband station Lhasa (LSA), permitting a laterally extended view into the lithosphere and upper mantle.The passive seismological part of INDEPTH II lasted from May until October 1994. Fifteen Reftek recording stations were operated in that time period. Nine stations were equipped with Guralp 3T broadband seismometers, and six with 1-Hz Mark L-4 seismometers. They were installed from the high Himalaya to approximately 150km north of the 27,491

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“…Deployments of regionally extensive and reasonably spatially sampled seismic arrays in the last decade have provided earthquake data that yield images of lithospheric structure at scales hitherto unattainable (Dueker and Sheehan, 1997;Rondenay et al, 2001;Poppeliers and Pavlis, 2003;Wilson et al, 2003). These images now play a crucial role in improving our understanding of past and present processes of tectonic evolution.…”

Section: Introductionmentioning

confidence: 99%

“…The introduction of spatially extensive and relatively dense threecomponent arrays allowed earthquake seismologists to adapt exploration seismology practices to the teleseismic imaging problem. Initial work in array-based processing used simple work flows involving linear moveout corrections combined with common conversion point stacking (Dueker and Sheehan, 1997). More recent efforts involved profiling an Archean continental suture in Southwestern Wyoming (Sheehan et al, 2000), and applying a Kirchoff-like migration/inversion based on a generalized Radon transform (GRT) to produce images of the Cascadia subduction zone .…”

Section: Introductionmentioning

confidence: 99%

Teleseismic shot-profile migration

2006

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Lithospheric images generated from multi-channel teleseismic data reveal important aspects of crustal and mantle structure, and offer windows into past and present tectonic processes. However, the imaging techniques used to generate these images can be improved through further adaption of exploration seismology practices. We introduce the shot-profile representation of wave-equation migration as a novel way to cast the teleseismic imaging problem. We show how this technique can be tailored to suit teleseismic acquisition geometry and wavefields, and detail a procedure for performing kinematic and structural imaging (migration) with all first-order forward-and backscattered phases in teleseismic coda. We apply the shot-profile migration algorithm to the IRIS-PASSCAL CASC-1993 data set to generate images of the Cascadia subduction zone. We generate a structural image that shows a fairly continuous crust-mantle reflector extending from the continental interior nearly to the mantle wedge. We suggest that differences between our results and other images of the Juan de Fuca subduction zone are attributable to a combination of the different filters applied during the imaging process and more coherent stacking of events due to migration with improved migration velocity profiles.

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

Cited by 444 publications

References 47 publications

A rootless rockies—Support and lithospheric structure of the Colorado Rocky Mountains inferred from CREST and TA seismic data

A rootless rockies—Support and lithospheric structure of the Colorado Rocky Mountains inferred from CREST and TA seismic data

Lithospheric and upper mantle structure of southern Tibet from a seismological passive source experiment

Teleseismic shot-profile migration

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