Arrival angles of teleseismic fundamental mode Rayleigh waves across the AlpArray

Kolínský, Petr; Bokelmann, Götz

doi:10.1093/gji/ggz081

Cited by 13 publications

(26 citation statements)

References 60 publications

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“…In Figure 3, arrival angle deviations are plotted as the difference between measured arrival angle and geometrical great circle for eight periods between 50 and 120 s, inside the magenta-bordered region surrounding the AlpArray. The same measurements have been presented in Figures 11 (M7.4) and S6 (M7.2) of Kolínský and Bokelmann (2019). Key observations are, on the one hand, the similarity of the patterns for the two earthquakes and, on the other hand, a lateral shift of the stripes by around 170 km.…”

Section: Observationsupporting

confidence: 63%

“…They have similar magnitudes (7.2 and 7.4) and distances (around 12,000 km, differing by 54 km), and the epicenters are separated by 330 km (Figure 1). These two events were chosen from the 20 earthquakes investigated by Kolínský and Bokelmann (2019), since the stripe-like patterns are clear over a broad period range and the arrival angle deviations are of high amplitude. The similarity of both events and the similarity of the observed patterns suggest that the arrival angle deviations are caused by the same structural anomaly.…”

Section: Data and Measurementmentioning

confidence: 99%

“…To do so, we followed the procedure of phase velocity measurement described by Kolínský et al (2011) and the array processing developed by Kolínský et al (2014). The overall procedure is the same as used by Kolínský and Bokelmann (2019). The magenta line in Figure 1 shows the area covered by the subarrays for the M7.4 earthquake.…”

Section: Data and Measurementmentioning

confidence: 99%

“…N&D2000 proposed an approach based on Gaussian beams to predict the phase-time delays τ(x,R,T) for a plane surface wave affected by a velocity anomaly. Kolínský and Bokelmann (2019) calculated the resulting arrival angle deviations A(x,R,T) as a lateral derivative of that time delay.…”

Section: Modeling and Inversionmentioning

confidence: 99%

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Surface Wave Diffraction Pattern Recorded on AlpArray: Cameroon Volcanic Line Case Study

2020

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Stripe‐like patterns of surface wave arrival angle deviations have been observed by several seismological studies around the world, but this phenomenon has not been explained so far. Here we test the hypothesis that systematic arrival angle deviations observed at the AlpArray broadband seismic network in Europe are interference patterns caused by diffraction of surface waves at single small‐scaled velocity anomalies. We use the observed pattern of Rayleigh waves from two earthquakes under the Southern Atlantic Ocean, and we fit this pattern with theoretical arrival angles derived by a simple modeling approach describing the interaction of a seismic wavefield with small anomalies. A grid search inversion scheme is implemented, which indicates that the anomaly is located in Central Africa, with its head under Cameroon. Moreover, the inversion enables the characterization of the anomaly: The anomaly is inferred to be between 320 and 420 km wide, matching in length the 2,500 km long upper mantle low‐velocity region under the volcano‐capped swells of the Cameroon volcanic line. We show that this approach can be generally used for studying the upper mantle anomalies worldwide.

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Section: Observationsupporting

confidence: 63%

Section: Data and Measurementmentioning

confidence: 99%

Section: Data and Measurementmentioning

confidence: 99%

Section: Modeling and Inversionmentioning

confidence: 99%

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Surface Wave Diffraction Pattern Recorded on AlpArray: Cameroon Volcanic Line Case Study

2020

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“…Smearing and weakening of the imaged anomalies are not only caused by the large wavelengths but also by the reduction in data coverage at long periods in the dataset (Kästle et al 2018). Complexities in the propagation path of surface waves can also affect the uncertainty in the deeper part of the model where it is largely constrained by earthquake data (Kolínskỳ et al 2019). Given that we use a pre-AlpArray (Hetényi et al 2018a) dataset, there is a considerable variability in station coverage which can additionally cause lateral variations in anomaly strength.…”

Section: Surface-wave Tomographymentioning

confidence: 99%

Slab break-offs in the Alpine subduction zone

Kästle

Rosenberg

Boschi

et al. 2020

Int J Earth Sci (Geol Rundsch)

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After the onset of plate collision in the Alps, at 32-34 Ma, the deep structure of the orogen is inferred to have changed dramatically: European plate break-offs in various places of the Alpine arc, as well as a possible reversal of subduction polarity in the eastern Alps have been proposed. We review different high-resolution tomographic studies of the upper mantle and combine shear-and body-wave models to assess the most reliable geometries of the slabs. Several hypotheses for the tectonic evolution are presented and tested against the tomographic model interpretations and constraints from geologic and geodetic observations. We favor the interpretation of a recent European slab break-off under the western Alps. In the eastern Alps, we review three published scenarios for the subduction structure and propose a fourth one to reconcile the results from tomography and geology. We suggest that the fast slab anomalies are mainly due to European subduction; Adriatic subduction plays no or only a minor role along the Tauern window sections, possibly increasing towards the Dinarides. The apparent northward dip of the slab under the eastern Alps may be caused by imaging a combination of Adriatic slab, from the Dinaric subduction system, and a deeper lying European one, as well as by an overturned, retreating European slab.

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Imaging the Earth using time-domain surface-wave measurements: Evaluation and correction of the finite-frequency phase shift

Lebedev

Meier

2021

Preprint

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Arrival angles of teleseismic fundamental mode Rayleigh waves across the AlpArray

Cited by 13 publications

References 60 publications

Surface Wave Diffraction Pattern Recorded on AlpArray: Cameroon Volcanic Line Case Study

Surface Wave Diffraction Pattern Recorded on AlpArray: Cameroon Volcanic Line Case Study

Slab break-offs in the Alpine subduction zone

Imaging the Earth using time-domain surface-wave measurements: Evaluation and correction of the finite-frequency phase shift

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