Crustal thickness and VP/VS variations in the Grenville orogen (Ontario, Canada) from analysis of teleseismic receiver functions

Eaton, David W.; Dineva, Savka; Mereu, R. F.

doi:10.1016/j.tecto.2006.01.023

Cited by 70 publications

(69 citation statements)

References 37 publications

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“…The mean V P =V S ratio is elevated compared to the Slave and Rae domains at 1.758, but it is identical to the Hearne domain, which, much like the Superior craton, exhibits widespread granite-and-greenstone geology (Thompson et al, 2010). As in previous studies, the highest values (> 1:80) appear to be associated with the Abitibi Greenstone belt, the Keweenawan midcontinent rift, and the Central Gneiss belt of the Grenville orogen (exhumed lower crustal rocks; Eaton et al, 2006;Darbyshire et al, 2007). Away from these areas, the V P =V S ratio is comparatively low (< 1:75), typical of felsic-to-intermediate cratonic crust.…”

Section: Superior and Environssupporting

confidence: 58%

“…This may be in the form of anisotropy (Levin and Park, 2000), a Hales discontinuity (Hales, 1969;Lebedev et al, 2009), or the recently observed Mid-Lithospheric discontinuity (Abt et al, 2010). A recent study by Postlethwaite et al (2014) of the entire Canadian landmass provides estimates of crustal thickness and V P =V S ratio using a different variant of the H κ approach to that used here (semblance-weighted stacking; Eaton et al, 2006). Also different from the approach used for CAN-HK (which provides a range of assumed V P values), Postlethwaite et al (2014) elect to use a single average value from the nearest 1°node of the CRUST1.0 model.…”

Section: Comparison With Continental Scale Studiesmentioning

confidence: 98%

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CAN‐HK: An a Priori Crustal Model for the Canadian Shield

Thompson

Kendall

Helffrich

et al. 2015

Seismological Research Letters

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Section: Superior and Environssupporting

confidence: 58%

Section: Comparison With Continental Scale Studiesmentioning

confidence: 98%

CAN‐HK: An a Priori Crustal Model for the Canadian Shield

Thompson

Kendall

Helffrich

et al. 2015

Seismological Research Letters

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“…The scale and tectonic architecture of the Grenville orogeny resemble the modern AlpineHimalayan orogeny, suggesting that it was formed as a result of broadly similar continent-continent collisional processes (Carr et al 2000). The crustal thickness within the Grenville province varies between 30 and 48 km, with a generally thinner crust in the vicinity of the WQSZ (Eaton et al 2006).…”

Section: Introductionmentioning

confidence: 92%

Studies on the June 23, 2010 north Ottawa M W 5.2 earthquake and vicinity seismicity

Motazedian

2012

J Seismol

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The basic parameters for the earthquake with a moment magnitude (M W ) of 5.2 on the 23rd of June 2010 have been investigated. The earthquake occurred on a hidden fault in the northwest direction about 60 km north-northeast of Ottawa in the Western Quebec Seismic Zone (WQSZ) and had a focal depth of about 21 km. The focal mechanism was a thrust type with strike in the northwest direction and dipping in the northeast direction. The relative relocations of seven larger aftershocks show that the source rupture area was about 6 km 2 . The b value of the aftershock sequence was 0.8-1.0, and the decay rate of the aftershocks was faster than normal cases. The dominant seismogenic depths are about 12 to 22 km in most parts of the WQSZ, while the seismogenic depth along the Ottawa-Bonnechere Graben can be as deep as 28 km. Based on the seismic activity in the WQSZ and vicinity since 1961, it seems that the periods of moderate earthquakes are about 6-10 years.

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“…For simple crustal structures, the technique yields a well-resolved maximum and unique result for the Moho depth in the grid search. However, in the presence of a layered crust, multiple pronounced local maxima are observed (e.g.,EATON et al 2006;OLSSON et al 2008).A grid search for both H and k shows multiple maxima among which the H and k values maximizing the S-function reach unrealistically high and low values at many stations. Examples of the S (H, k) function are shown in the supplementary online material (…”

mentioning

confidence: 97%

A New Seismic Data Set on the Depth of the Moho in the Alps

Bianchi

Behm

Rumpfhuber

et al. 2014

Pure Appl. Geophys.

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We present the results from receiver function analysis applied to a comprehensive data set in the Eastern Alps. Teleseismic events were recorded at 70 stations with an average deployment of 1 year. The investigated area includes the eastern part of the Eastern Alps and their transition to the Bohemian Massif, the Pannonian domain, and the Southern Alps. The crustal structure at each station is examined with the Zhu-Kanamori (ZK) method, which yields well-resolved interface depths in laterally homogeneous media with limited layering. The application of the ZK technique is challenged because of the complex tectonic setting; therefore, we include additional constraints from recent active-source seismic studies. In particular, the well-known crustal P-wave velocity and, where available, the V p /V s ratio are kept fixed, thus reducing the ambiguity in determining Moho depths. Individual depth values vary strongly between adjacent stations, showing that the employment of the ZK technique in tectonically complex settings is limited. We therefore avoid interpreting the results in detail, but rather compare them to existing crustal models of the Eastern Alps. We regard this receiver function study in the easternmost part of the Alps as a documentation of a data set that has potential to be exploited in the future.

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Crustal thickness and VP/VS variations in the Grenville orogen (Ontario, Canada) from analysis of teleseismic receiver functions

Cited by 70 publications

References 37 publications

CAN‐HK: An a Priori Crustal Model for the Canadian Shield

CAN‐HK: An a Priori Crustal Model for the Canadian Shield

Studies on the June 23, 2010 north Ottawa M W 5.2 earthquake and vicinity seismicity

A New Seismic Data Set on the Depth of the Moho in the Alps

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