On the detection and identification of converted and reflected phases from receiver functions

Chevrot, Sébastien; Girardin, N.

doi:10.1046/j.1365-246x.2000.00139.x

Cited by 27 publications

(17 citation statements)

References 31 publications

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“…Langston, 1977;Chevrot and Girardin, 2000). These functions are computed from three-component seismograms and show the relative response of Earth's structure below the receiver (Ammon, 1991).…”

Section: Methodsmentioning

confidence: 99%

Crustal thickness, discontinuity depth, and upper mantle structure beneath southern Africa: constraints from body wave conversions

Stankiewicz

Chevrot

Hilst

et al. 2002

Physics of the Earth and Planetary Interiors

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The technique of receiver function analysis is applied to the study of crustal and upper mantle structures beneath the Kaapvaal craton in southern Africa and its surroundings. Seismic data were recorded by the seismic array of 82 sites deployed from April 1997 to April 1999 across southern Africa, as well as a dense array of 32 sites near Kimberley, in operation from December 1998 to June 1999. Arrival times for phases converted at the Moho are used to determine crustal thickness. The Moho depth in the south-western section of the craton was found to vary between 37 and 40 km, except for one station that recorded a depth of 43 km (SA23). Farther north along the western block of the craton (into Botswana) the depth increases up to 43 km. The depth increases even further in the north-eastern section of the craton, where results vary from 40 to 52 km. Just north of the Kaapvaal craton, in the neighbouring Zimbabwe craton, the crustal thickness drops significantly. The results obtained there varied from 36 to 40 km. For the Kimberley area, using the dense array, the Moho depth was found to be 37.3 km. Arrivals of the Ps and Ppps phases were used to determine the Poisson's ratio in the region. This was found to be 0.26 ± 0.01. Arrivals of phases from the 410 and 660 km mantle discontinuities are used to interpret the relative positions of these discontinuities, as well as for comparison of mantle temperatures and seismic velocities in the region with global averages. In the Kimberley area the 410 and 660 km discontinuities were found at their expected depth, implying that mantle temperatures in the region are close to the global average. The seismic velocities above the '410' were found up to 5% faster than the averages from the global iasp91 model, which is fast even by Precambrian standards. In other sections of the Kaapvaal craton, the velocities are also faster than global averages, but not as fast as beneath Kimberley. In these sections, the '410' is also slightly elevated, while the '660' is depressed, which implies a slightly lower mantle temperature relative to the global average. Beneath the Kaapvaal craton we find evidence suggesting the presence of a zone with a reduced wavespeed gradient at an upper bound of approximately 300 km, which may mark the lower chemical boundary of the craton.

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Section: Methodsmentioning

confidence: 99%

Crustal thickness, discontinuity depth, and upper mantle structure beneath southern Africa: constraints from body wave conversions

Stankiewicz

Chevrot

Hilst

et al. 2002

Physics of the Earth and Planetary Interiors

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“…Very few studies use a wider range, including a few events at smaller distances as well as the weak Pdiff phase (e.g. Chevrot and Girardin 2000;Levin and Park 2000). At larger epicentral distances, PKP has been used, especially to image dipping structures (e.g.…”

Section: Usable Distance Range For Receiver Functions On Marsmentioning

confidence: 99%

Crustal S-Wave Velocity from Apparent Incidence Angles: A Case Study in Preparation for InSight

2018

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Retrieval of crustal structure and thickness of Mars is among the main goals of InSight. Here we investigate which constraints on the crust at the landing site can be provided by apparent P-wave incidence angles derived from P-receiver functions. We consider receiver functions for six different Mars models, calculated from synthetic seismograms generated via Instaseis from the Green's function databases of the Marsquake Service, in detail. To allow for a larger range of crustal thicknesses and structures, we additionally analyze data from five broad-band stations across Central Europe. We find that the likely usable epicentral distance range for P-wave receiver functions on Mars lies between 35• and the core shadow, and can be extended to more than 150• by also using the PP-phase. Comparison to models for the spatial distribution of Martian seismicity indicates that sufficient seismicity should occur within the P-wave distance range around InSight within the nominal mission duration to allow for the application of our method. Apparent P-wave incidence angles are derived from the amplitudes of vertical and radial receiver functions at the P-wave onset within a range of period bands, up to 120 s. The apparent incidence angles are directly related to apparent S-wave velocities, which are inverted for the subsurface S-wave velocity structure via a grid search. The veracity of the forward calculated receiver functions and apparent S-wave velocities is ensured by benchmarking various algorithms against the Instaseis synthetics. Results indicate that apparent S-wave velocity curves provide valuable constraints on crustal thickness and structure, even without any additional constraints, and considering the location uncertainty and limited data quantity of InSight. S-wave velocities in the upper half of the crust are constrained best, but if reliable measurements at long periods are available, the curves also provide constraints down to the uppermost mantle. Besides, it is demonstrated that the apparent velocity curves can differentiate between crustal velocity models that are indistinguishable by other methods.The InSight Mission to Mars II Edited

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“…3). Figure 4 shows the stacked RFs without filtering for all stations and an example of the RFs obtained for station IXTA at the south of the transect; in this case they were filtered with a singular value decomposition (SVD) filter (CHEVROT and GIRARDIN, 2000) for visualization. Moho and the oceanic crust can be identified.…”

Section: Data and Processingmentioning

confidence: 99%

“…5), we performed a stacking scheme (ZHU and KANAMORI, 2000) for the RFs, after applying a SVD filter (CHEVROT and GIRARDIN, 2000), both, using all the RFs and grouping them according to their back azimuth (/ B ). Unfortunately, there were very few events in the first quadrant and not many more in the third (see Fig.…”

Section: Data and Processingmentioning

confidence: 99%

“…2) with 430 and 425 RFs, respectively, and applied an SVD filter (CHEVROT and GIRARDIN, 2000) to each bin to enhance coherent arrivals. After this, a fourth order Butterworth filter Table 1 Moho depths, H, in km, and j = V P /V S at each station for all receiver functions (numbers in parenthesis indicate the confidence interval), and for the three back azimuth (/ B ) ranges.…”

Section: Subducted Oceanic Crust Geometrymentioning

confidence: 99%

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Imaging the Moho and Subducted Oceanic Crust at the Isthmus of Tehuantepec, Mexico, from Receiver Functions

Melgar

Pérez‐Campos

2010

Pure Appl. Geophys.

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Using teleseismic data recorded along a transect, which we call VEOX (for Veracruz-Oaxaca seismic line), of 46 broadband stations installed across the Isthmus of Tehuantepec in southern Mexico, we obtained receiver functions and stacked them to study the Moho topography and back projected them to visualize the subducted slab geometry beneath the isthmus. We observed a back-azimuth dependent Moho thickness across the transect, particularly beneath the Los Tuxtlas Volcanic Field. Also, we observed the Cocos plate which subducts with an angle of 26°b etween 140 and 310 km from the trench. Comparison with regional seismicity indicates that it occurs below the oceanic crust.

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On the detection and identification of converted and reflected phases from receiver functions

Cited by 27 publications

References 31 publications

Crustal thickness, discontinuity depth, and upper mantle structure beneath southern Africa: constraints from body wave conversions

Crustal thickness, discontinuity depth, and upper mantle structure beneath southern Africa: constraints from body wave conversions

Crustal S-Wave Velocity from Apparent Incidence Angles: A Case Study in Preparation for InSight

Imaging the Moho and Subducted Oceanic Crust at the Isthmus of Tehuantepec, Mexico, from Receiver Functions

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