Seismic structure beneath the Gulf of California: a contribution from group velocity measurements

Luccio, F. Di; Persaud, Patricia; Clayton, Robert W.

doi:10.1093/gji/ggu338

Cited by 36 publications

(19 citation statements)

References 46 publications

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“…Labels above the profiles and dashed lines indicate provinces. White arrows mark regions with asthenospheric upwelling from Di Luccio et al []. Possible evidence of lower crustal flow from beneath Baja into the Gulf is observed in Figures a, c, and d, and marked with a black arrow in Figure d (see supporting information).…”

Section: Shear Wave Velocity Resultsmentioning

confidence: 99%

“…We divide the LVZs into two groups, the shallower group extending from 20 to 38 km (Figures a–c) and the deeper ones extending from 38 to 50 km (Figures d and e) based on their associated velocities and the possible interpretation of these features. The most prominent and continuous shallow group LVZs (yellow regions in Figure based on shear wave velocities <3.8 km/s in the 28–32 km depth range) either overlie or are located close to regions of asthenospheric upwelling at 50–90 km depths as interpreted by Di Luccio et al [] (shaded red in Figure ). The LVZs in the shallow group show an increase in areal extent with increasing depth down to 32 km (Figures a and b).…”

Section: Shear Wave Velocity Resultsmentioning

confidence: 99%

“…We interpret the 10 km grid spacing 3‐D shear wave velocity results derived by Di Luccio et al [] in the 20–50 km depth range beneath the Gulf of California and the surrounding continental margins. Those authors used 76 events ( M = 4.2–6.5) that were recorded over a 5 year time period by the Network of Autonomously Recording Seismographs (NARS)‐Baja array [ Clayton et al ., ], three Southern California Seismic Network stations, the Geoscope station UNM in Mexico City, and the Global Seismographic Network station TUC in Tucson, Arizona (Figure ).…”

Section: Datamentioning

confidence: 99%

“…Those authors used 76 events ( M = 4.2–6.5) that were recorded over a 5 year time period by the Network of Autonomously Recording Seismographs (NARS)‐Baja array [ Clayton et al ., ], three Southern California Seismic Network stations, the Geoscope station UNM in Mexico City, and the Global Seismographic Network station TUC in Tucson, Arizona (Figure ). Di Luccio et al [] computed the group velocity curves using the technique developed by Herrmann []. These along path measurements were then converted into tomographic images using kernels which vary in off‐path width as a function of the average velocity and of the period and using the least square algorithm from Paige and Saunders [] to smooth and damp the tomographic maps at different periods.…”

Section: Datamentioning

confidence: 99%

“…Low-velocity zones are shaded yellow based on our 3.8 km/s contours of the shear wave velocities at 28-32 km depths. Asthenospheric upwellings [Di Luccio et al, 2014] are shaded red. Horizontal black lines mark the approximate extent of new oceanic sedimentary or oceanic crust [Lizarralde et al, 2007;Lonsdale, 1989;Martín-Barajas et al, 2013].…”

Section: Introductionmentioning

confidence: 99%

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Rayleigh wave dispersion measurements reveal low‐velocity zones beneath the new crust in the Gulf of California

Persaud

Luccio

Clayton

2015

Geophysical Research Letters

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Rayleigh wave tomography provides images of the shallow mantle shear wave velocity structure beneath the Gulf of California. Low‐velocity zones (LVZs) are found on axis between 26 and 50 km depth beneath the Guaymas Basin but mostly off axis under the other rift basins, with the largest feature underlying the Ballenas Transform Fault. We interpret the broadly distributed LVZs as regions of partial melting in a solid mantle matrix. The pathway for melt migration and focusing is more complex than an axis‐centered source aligned above a deeper region of mantle melt and likely reflects the magmatic evolution of rift segments. We also consider the existence of solid lower continental crust in the Gulf north of the Guaymas Basin, where the association of the LVZs with asthenospheric upwelling suggests lateral flow assisted by a heat source. These results provide key constraints for numerical models of mantle upwelling and melt focusing in this young oblique rift.

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Section: Shear Wave Velocity Resultsmentioning

confidence: 99%

Section: Shear Wave Velocity Resultsmentioning

confidence: 99%

Section: Datamentioning

confidence: 99%

Section: Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rayleigh wave dispersion measurements reveal low‐velocity zones beneath the new crust in the Gulf of California

Persaud

Luccio

Clayton

2015

Geophysical Research Letters

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San Andreas Fault dip, Peninsular Ranges mafic lower crust and partial melt in the Salton Trough, Southern California, from ambient‐noise tomography

Barak

Klemperer

Lawrence

2015

Geochem Geophys Geosyst

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We use ambient-noise tomography to improve CVM-H11.9, a community velocity model of southern California. Our new 3-D shear-velocity model with 0:05 x 0:05 lateral and 1 km vertical blocks reveals new structure beneath the San Andreas Fault (SAF), Peninsular Ranges batholith (PRB), southern Sierra Nevada batholith (SNB), and the Salton Trough (ST). We use 4 years of data recorded on 849 broadband stations, vastly more than previous studies and including our own broadband Salton Seismic Imaging Project, a 40 station transect across the ST, as well as other campaign stations in both Mexico and the United States. Mean lower crust and upper mantle wave speeds (3.6 km/s at 20 km, 4.2 km/s at 40 km) are low by global standards. Across the SAF, southeast of San Gorgonio Pass, we observe vertical to steeply dipping lateral velocity contrasts that extend beneath the Moho. Beneath the western PRB and westernmost southern SNB, we observe relatively high shear velocities (!3.8 km/s) in the lower crust that we interpret as the mafic roots of the overlying arc. Relatively high-velocity upper mantle (up to $4.5 km/s) may be part of the intact arc, or possibly a remnant of the Farallon plate. Beneath the ST, we observe zones of low shearvelocity in the lower crust and upper mantle which permit up to $4.5% melt in the lower crust and up to $6% melt in the upper mantle, depending on the assumed composition and pore geometry. Our results preclude the existence of older continental crust beneath the ST and support the creation of new crust beneath the ST.

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Geometric Aspects of the Full Moment Tensors in the Gulf of California and the Mexican East Pacific Rise

Ortega¹,

Quintanar²,

Huesca‐Pérez³

2015

Pageoph Topical Volumes

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Seismic structure beneath the Gulf of California: a contribution from group velocity measurements

Cited by 36 publications

References 46 publications

Rayleigh wave dispersion measurements reveal low‐velocity zones beneath the new crust in the Gulf of California

Rayleigh wave dispersion measurements reveal low‐velocity zones beneath the new crust in the Gulf of California

San Andreas Fault dip, Peninsular Ranges mafic lower crust and partial melt in the Salton Trough, Southern California, from ambient‐noise tomography

Geometric Aspects of the Full Moment Tensors in the Gulf of California and the Mexican East Pacific Rise

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