Thin crust and active upper mantle beneath the Southern Sierra Nevada in the western United States

Ruppert, Shannon M.; Fliedner, Moritz M.; Zandt, G.

doi:10.1016/s0040-1951(97)00268-0

Cited by 85 publications

(87 citation statements)

References 37 publications

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“…The deeper conversion near 40 km depth appears on all the receiver functions but is fairly weak to the east and relatively strong to the west. The 40 km event we consider to be probable Moho; it agrees well with the results from the refraction experiment [Fliedner et al, 1996;Ruppert et al, 1998]. The 30 km event is coherent and repeatable, yet its behavior is somewhat cryptic.…”

Section: Mk: Complexity At the Moho Complications In The Moho Conversupporting

confidence: 86%

“…Because the last major crustal accretion event apparent at the surface is the Mesozoic volcanic arc that constructed the Sierra Nevada batholith [e.g., Bateman and Wahrhafiig, 1966;Bateman and Eaton, 1967;Bateman, 1992 To address this problem, the Southern Sierra Nevada Continental Dynamics Project (SSCDP) was conducted in and around the southern Sierra during 1993 [Park et al, 1995;Wernicke et al, 1996]. This experiment included major wideangle reflection/refraction profiling [Fliedner et al, 1996;Ruppert et al, 1994Ruppert et al, , 1998], new gravity measurements, petrologic and geochemical examination of xenoliths [Ducea and Saleeby, 1996] and magnetotelluric measurements [Park et al, 1996] as well as the deployment of three arrays of seismometers across the Sierra for 4 months in 1993 (this paper) (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

“…Magnetotelluric results place a boundary between extremely resistive Sierran crust and some more conductive body at about 10-20 km bsl [Park et al, 1996]; the conductive body is inferred to be caused by partial melt. The SSCDP refraction profile across the Sierra is interpreted to have a small (--1%) P wave low-velocity zone from --22 to 27 km bsl under array HM but no equivalent feature under array DP [Ruppert et al, 1998]. …”

mentioning

confidence: 99%

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Seismic structure of the lithosphere from teleseismic converted arrivals observed at small arrays in the southern Sierra Nevada and vicinity, California

Jones¹,

Phinney²

1998

J. Geophys. Res.

128

135

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Abstract. 21 well-distributed teleseisms (30 ø to 100 ø distance) were recorded by mixed broadband (BB) and short-period (SP) seismic arrays at Mineral King (MK) and Horseshoe Meadow (HM) in the southern Sierra Nevada and at Darwin Plateau (DP) between the Inyo and Argus ranges. These arrays permit identification and separation of direct P and S arrivals, reflections from topography, scattered energy, and arrivals from different back azimuths (multipath arrivals). P-to-S conversions can be identified from beamed BB or SP seismograms. Least squares time domain processing recovered single-event receiver functions from these beamed seismograms. Converted phases attributable to the Moho are clear and uncomplicated at DP; Ps-P times of 3.9-4.2 s correspond to crustal thicknesses of 31-33 km, assuming a mean P crustal velocity of 6.2 km/s and a Poisson's ratio (v) of 0.255. Ps-P times at HM (eastern Sierra) are 3.9-4.6 s (32-37 km) excepting some unusual seismograms from events at back azimuths of 2250-239 ø. MK (western Sierra) times for Ps-P show a strong E-W asymmetry: 3.9-4.1 s (31-33 kin) from the east, and 4.8-5.3 s (39-42 km) from the west. The MK arrivals from the east are multiple and substantially weaker by comparison with HM and DP. These results confirm the absence of a thick crust under the southern High Sierra inferred from both a refraction experiment coincident with this experiment and some earlier studies. At DP the Moho event follows an intracrustal negative polarity event defining the top of an S wave low-velocity zone. This feature dips west under the Sierran crest at HM but is absent farther west at MK. This feature appears to be a manifestation of extensional strain and thus indicates that the surficially undeformed Sierra overlies a tectonized lower crust. Sub-Moho energy is absent under the Basin and Range (DP) but is conspicuous under the High Sierra at positive arrivals -7.3 s (MK) and -9 s (HM) after the P. These arrivals might be from the base of a low-velocity, low-density upper mantle body supporting the Sierra.

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Section: Mk: Complexity At the Moho Complications In The Moho Conversupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Seismic structure of the lithosphere from teleseismic converted arrivals observed at small arrays in the southern Sierra Nevada and vicinity, California

Jones¹,

Phinney²

1998

J. Geophys. Res.

128

135

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show abstract

“…Front panel (from ref. 7) illustrates a 2D cross section combining a crustal velocity model (above 60 km, green is low velocity and yellow is high velocity) and an upper-mantle seismic tomographic image (below 60 km, blue is high velocity and red is low velocity). A localized zone of crustal thickening appears to be associated with the top of a zone of mantle 'drip'.…”

Section: Figure S1mentioning

confidence: 99%

Active foundering of a continental arc root beneath the southern Sierra Nevada in California

Zandt

Gilbert

Owens

et al. 2004

Nature

Self Cite

390

317

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“…Zalán & Oliveira, 2005). O processo de delaminação tipicamente resulta em baixas Vp para a crosta inferior (Ruppert et al, 1998). O repentino afinamento de todo o pacote crustal no sentido da costa coincide com significativo aumento da anomalia Bouguer (diagrama superior da Figura 6.2), demonstrando que o limite crosta-manto tende a ser a atual superfície de compensação isostática da região.…”

Section: Bacia Do Paranáunclassified

Modelo de velocidade sísmica de ondas P da crosta e manto superior ao longo do perfil PABBRISE, estado de São Paulo

Bernardes¹

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Thin crust and active upper mantle beneath the Southern Sierra Nevada in the western United States

Cited by 85 publications

References 37 publications

Seismic structure of the lithosphere from teleseismic converted arrivals observed at small arrays in the southern Sierra Nevada and vicinity, California

Seismic structure of the lithosphere from teleseismic converted arrivals observed at small arrays in the southern Sierra Nevada and vicinity, California

Active foundering of a continental arc root beneath the southern Sierra Nevada in California

Modelo de velocidade sísmica de ondas P da crosta e manto superior ao longo do perfil PABBRISE, estado de São Paulo

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