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- W1994794054 abstract "The upper mantle beneath the Alps and the Variscides of Central Europe has a varied seismic structure as a result of the accretionary and evolutionary processes that have shaped it. Natural earthquake data, the raypaths of which pass beneath these regions, have enabled the calculation of travel times out to 3000 km. The source-receiver geometry ensured there was broadband station coverage at offsets between 900 and 3000 km, enabling the detection of the appropriate upper mantle phases over an azimuthal span embracing the studied structures. The resulting data allowed us to model first order discontinuities to a depth of about 420 km. We have used modelling based on ray-tracing in a cylindrical coordinate system reflecting the geometry of the wave propagation medium. The data allow determination of the thickness of the upper mantle low velocity zone (LVZ) beneath the Alpine orogen. It appears to be thicker than beneath surrounding areas, with its upper ‘lid’ at a depth of about 90 km and its base, the ‘Lehmann discontinuity’, being depressed to 220 km. Such thickening of the LVZ is typical below young orogens. A seismic discontinuity at a depth of around 300 km, with the P-wave velocity increasing to 9 km/s, has been observed for all the sub-Alpine raypaths. We consider this discontinuity to have originated as a result of Alpine orogen subduction. This is responsible not only for changes in the thermal field as a result of transporting colder material to depths probably exceeding 200 km but also for delivering the necessary amounts of excess silica required for the coesite–stishovite phase transition. For rays passing beneath the Variscides, there is a scatter in travel times over the 8–15° distance range. However, the scattering does not indicate significant thickening of the LVZ as identified beneath the Alpine orogen, and the Lehmann discontinuity at the base of the LVZ does not exceed 200 km depth. Also, in contrast to the Alps, no high velocity phases are observed for a discontinuity near 300 km depth. This supports our contention that the 300-km discontinuity is a regional feature ascribed to the subduction regime beneath the younger orogen. For all azimuths from which structures beneath the Alps are illuminated, we clearly observe both the refraction as well as the reflection branch from the 410-km discontinuity." @default.
- W1994794054 created "2016-06-24" @default.
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- W1994794054 date "2012-09-01" @default.
- W1994794054 modified "2023-10-14" @default.
- W1994794054 title "Age-differentiated subduction regime: An explanation of regional scale upper mantle differences beneath the Alps and the Variscides of Central Europe" @default.
- W1994794054 cites W1480881588 @default.
- W1994794054 cites W1967004471 @default.
- W1994794054 cites W1969920739 @default.
- W1994794054 cites W1970324494 @default.
- W1994794054 cites W1978237280 @default.
- W1994794054 cites W1978273810 @default.
- W1994794054 cites W1980241913 @default.
- W1994794054 cites W1980297487 @default.
- W1994794054 cites W1980899546 @default.
- W1994794054 cites W1980997648 @default.
- W1994794054 cites W1982443326 @default.
- W1994794054 cites W1988543275 @default.
- W1994794054 cites W1992226092 @default.
- W1994794054 cites W1992743639 @default.
- W1994794054 cites W1995026670 @default.
- W1994794054 cites W1995253253 @default.
- W1994794054 cites W1996650279 @default.
- W1994794054 cites W2002282006 @default.
- W1994794054 cites W2004828846 @default.
- W1994794054 cites W2006766138 @default.
- W1994794054 cites W2008932514 @default.
- W1994794054 cites W2012467760 @default.
- W1994794054 cites W2013028712 @default.
- W1994794054 cites W2014696348 @default.
- W1994794054 cites W2015739117 @default.
- W1994794054 cites W2017528031 @default.
- W1994794054 cites W2023370602 @default.
- W1994794054 cites W2029269888 @default.
- W1994794054 cites W2030092125 @default.
- W1994794054 cites W2030114314 @default.
- W1994794054 cites W2030724565 @default.
- W1994794054 cites W2033506275 @default.
- W1994794054 cites W2037944876 @default.
- W1994794054 cites W2038029958 @default.
- W1994794054 cites W2041620294 @default.
- W1994794054 cites W2044753344 @default.
- W1994794054 cites W2047680420 @default.
- W1994794054 cites W2056259282 @default.
- W1994794054 cites W2058069835 @default.
- W1994794054 cites W2062221814 @default.
- W1994794054 cites W2063023081 @default.
- W1994794054 cites W2068265958 @default.
- W1994794054 cites W2068698233 @default.
- W1994794054 cites W2070005436 @default.
- W1994794054 cites W2072711200 @default.
- W1994794054 cites W2075537612 @default.
- W1994794054 cites W2079444008 @default.
- W1994794054 cites W2083935149 @default.
- W1994794054 cites W2084491750 @default.
- W1994794054 cites W2085341666 @default.
- W1994794054 cites W2085441552 @default.
- W1994794054 cites W2086699346 @default.
- W1994794054 cites W2087439887 @default.
- W1994794054 cites W2088207845 @default.
- W1994794054 cites W2089510390 @default.
- W1994794054 cites W2104450101 @default.
- W1994794054 cites W2105017004 @default.
- W1994794054 cites W2109191340 @default.
- W1994794054 cites W2112849189 @default.
- W1994794054 cites W2113170614 @default.
- W1994794054 cites W2113588261 @default.
- W1994794054 cites W2114722673 @default.
- W1994794054 cites W2122480569 @default.
- W1994794054 cites W2129630903 @default.
- W1994794054 cites W2135159355 @default.
- W1994794054 cites W2136463069 @default.
- W1994794054 cites W2141906016 @default.
- W1994794054 cites W2144763402 @default.
- W1994794054 cites W2145018710 @default.
- W1994794054 cites W2146830645 @default.
- W1994794054 cites W2151123314 @default.
- W1994794054 cites W2153145378 @default.
- W1994794054 cites W2165490846 @default.
- W1994794054 cites W2166465211 @default.
- W1994794054 cites W2168959606 @default.
- W1994794054 cites W2169003474 @default.
- W1994794054 cites W2285404943 @default.
- W1994794054 cites W2467928326 @default.
- W1994794054 doi "https://doi.org/10.1016/j.pepi.2012.06.001" @default.
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