Investigation of the lithosphere beneath the Vogelsberg volcanic complex with P-wave travel time residuals

1993 ◽  
Vol 82 (1) ◽  
pp. 20-29 ◽  
Author(s):  
T. Braun ◽  
H. Berckhemer
Keyword(s):  
Travel Time ◽  
P Wave ◽  
Volcanic Complex ◽  
Wave Travel

scholarly journals Teleseismic P-wave travel time and amplitude anomalies observed in Hokkaido region, Japan.

1990 ◽  
Vol 38 (2) ◽  
pp. 163-177 ◽  
Author(s):  
Ichiro Nakanishi ◽  
Yoshinobu Motoya
Keyword(s):  
Travel Time ◽  
P Wave ◽  
Wave Travel

P-wave travel time residuals caused by a dipping plate in the Aegean Arc in Greece

1977 ◽  
Vol 37 (1-3) ◽  
pp. 83-93 ◽  
Author(s):  
Søren Gregersen
Keyword(s):  
Travel Time ◽  
P Wave ◽  
Wave Travel ◽  
Aegean Arc

P-wave travel-time anomalies. Aleutian-Alaska region

1974 ◽  
Vol 11 (3) ◽  
pp. 52
Author(s):  
N.N. Biswas ◽  
M.N. Toksoez ◽  
H.H. Kehrer
Keyword(s):  
Travel Time ◽  
P Wave ◽  
Wave Travel

P-wave travel-time residuals and the crust and upper mantle lateral inhomogeneities in Africa

1980 ◽  
Vol 67 (1-2) ◽  
pp. 123-137 ◽  
Author(s):  
E. Lenartowicz ◽  
R.N.H. Albert
Keyword(s):  
Travel Time ◽  
Upper Mantle ◽  
P Wave ◽  
Crust And Upper Mantle ◽  
Wave Travel

Model Update December 2008: Upper Mantle Heterogeneity beneath North America from P-wave Travel Time Tomography with Global and USArray Transportable Array Data

2009 ◽  
Vol 80 (4) ◽  
pp. 638-645 ◽  
Author(s):  
S. Burdick ◽  
R. D. van der Hilst ◽  
F. L. Vernon ◽  
V. Martynov ◽  
T. Cox ◽  
...  
Keyword(s):  
North America ◽  
Travel Time ◽  
Upper Mantle ◽  
P Wave ◽  
Mantle Heterogeneity ◽  
Array Data ◽  
Travel Time Tomography ◽  
Model Update ◽  
Wave Travel

scholarly journals A common deep source for upper-mantle upwellings below the Ibero-western Maghreb region from teleseismic P-wave travel-time tomography

2018 ◽  
Vol 499 ◽  
pp. 157-172 ◽  
Author(s):  
Chiara Civiero ◽  
Vincent Strak ◽  
Susana Custódio ◽  
Graça Silveira ◽  
Nicholas Rawlinson ◽  
...  
Keyword(s):  
Travel Time ◽  
Upper Mantle ◽  
P Wave ◽  
Travel Time Tomography ◽  
Wave Travel ◽  
Deep Source

Teleseismic P-wave travel time tomography of the Alpine upper mantle using AlpArray seismic network data

2020 ◽  
Author(s):  
Marcel Paffrath ◽  
Wolfgang Friederich ◽  
Keyword(s):  
Travel Time ◽  
Upper Mantle ◽  
High Velocity ◽  
Eastern Alps ◽  
Alpine Region ◽  
Seismic Network ◽  
P Wave ◽  
Travel Times ◽  
Travel Time Tomography ◽  
Wave Travel

<p>We perform a teleseismic P-wave travel time tomography to examine geometry and slab structure of the upper mantle beneath the Alpine orogen. Vertical component data of the extraordinary dense seismic network AlpArray are used which were recorded at over 600 temporary and permanent broadband stations deployed by 24 different European institutions in the greater Alpine region, reaching from the Massif Central to the Pannonian Basin and from the Po plain to the river Main. Mantle phases of 347 teleseismic events between 2015 and 2019 of magnitude 5.5 and higher are evaluated automatically for direct and core diffracted P arrivals using a combination of higher-order statistics picking algorithms and signal cross correlation. The resulting database contains over 170.000 highly accurate absolute P picks that were manually revised for each event. The travel time residuals exhibit very consistent and reproducible spatial patterns, already pointing at high velocity slabs in the mantle.</p><p>For predicting P-wave travel times, we consider a large computational box encompassing the Alpine region up to a depth of 600 km within which we allow 3D-variations of P-wave velocity. Outside this box we assume a spherically symmetric earth and apply the Tau-P method to calculate travel times and ray paths. These are injected at the boundaries of the regional box and continued using the fast marching method. We invert differences between observed and predicted travel times for P-wave velocities inside the box. Velocity is discretized on a regular grid with an average spacing of about 25 km. The misfit reduction reaches values of up to 75% depending on damping and smoothing parameters.</p><p>The resulting model shows several steeply dipping high velocity anomalies following the Alpine arc. The most prominent structure stretches from the western Alps into the Apennines mountain range reaching depths of over 500 km. Two further anomalies extending down to a depth of 300 km are located below the central and eastern Alps, separated by a clear gap below the western part of the Tauern window. Further to the east the model indicates a possible high-velocity connection between the eastern Alps and the Dinarides. Regarding the lateral position of the central and eastern Alpine slabs, our results confirm previous studies. However, there are differences regarding depth extent, dip angles and dip directions. Both structures dip very steeply with a tendency towards northward dipping. We perform various general, as well as purpose-built resolution tests, to verify the capabilities of our setup to resolve slab gaps as well as different possible slab dipping directions.</p>

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