Articles | Volume 11, issue 2
https://doi.org/10.5194/se-11-669-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-11-669-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
30 Apr 2020
Research article |
| 30 Apr 2020
| 30 Apr 2020
Seismic waveform tomography of the central and eastern Mediterranean upper mantle
Bullard Laboratories, Department of Earth Sciences, University of Cambridge, Madingley Rise, Cambridge CB3 0EZ, UK
previously at: Department of Earth Sciences, Universiteit Utrecht, Princetonlaan 8A, 3584 CB Utrecht, the Netherlands
Invited contribution by Nienke Blom, recipient of the EGU Seismology Outstanding Student Poster and PICO Award 2017.
Alexey Gokhberg
Department of Earth Sciences, ETH Zürich, Sonneggstrasse 5, 8092 Zürich, Switzerland
Andreas Fichtner
Department of Earth Sciences, ETH Zürich, Sonneggstrasse 5, 8092 Zürich, Switzerland
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We developed a method that allows to estimate the acoustic attenuation of seismic waves within regions with high earthquake source densities. Attenuation is of high interest as it allows to draw conclusions on the origin of seismic activity. We apply our method to north-west Bohemia, which is regularly affected by earthquake swarms during which thousands of earthquakes are registered within a few days. We find reduced attenuation within the active volume, which may indicate high fluid content.
Cited articles
Ahrens, J., Geveci, B., and Law, C.: Paraview: An end-user tool for large data
visualization, The visualization handbook, Elsevier, München, 2005. a
Akçelik, V., Biros, G., and Ghattas, O.: Parallel multiscale
Gauss-Newton-Krylov methods for inverse wave propagation, in:
Supercomputing, ACM/IEEE 2002 Conference, Baltimore, USA, 41–41, IEEE, 2002. a
Aki, K., Christoffersson, A., and Husebye, E. S.: Determination of the
three-dimensional seismic structure of the lithosphere, J.
Geophys. Res., 82, 277–296, https://doi.org/10.1029/JB082i002p00277, 1977. a
Backus, G. E.: Long-wave elastic anisotropy produced by horizontal layering, J.
Geophys. Res., 67, 4427–4440, 1962. a
Bakırcı, T., Yoshizawa, K., and Özer, M. F. R.: Three-dimensional
S-wave structure of the upper mantle beneath Turkey from surface wave
tomography, Geophys. J. Int., 190, 1058–1076,
https://doi.org/10.1111/j.1365-246X.2012.05526.x, 2012. a
Beller, S., Monteiller, V., Operto, S., Nolet, G., Paul, A., and Zhao, L.:
Lithospheric architecture of the South-Western Alps revealed by
multiparameter teleseismic full-waveform inversion, Geophys. J.
Int., 212, 1369–1388, 2017. a
Bennett, R. A., Hreinsdóttir, S., Buble, G., Bašić, T.,
Bačić, v., Marjanović, M., Casale, G., Gendaszek, A., and Cowan,
D.: Eocene to present subduction of southern Adria mantle lithosphere
beneath the Dinarides, Geology, 36, 3–6, 2008. a
Bird, P.: An updated digital model of plate boundaries, Geochem. Geophy.
Geosy., 4, 1027–1079, 2003. a
Biswas, R. and Sen, M.: 2D full-waveform inversion and uncertainty estimation
using the reversible jump Hamiltonian Monte Carlo, in: SEG Technical
Program Expanded Abstracts 2017, 1280–1285, Society of Exploration
Geophysicists, Houston, 2017. a
Blanch, J. O., Robertsson, J. O. A., and Symes, W. W.: Modelling of a constant
Q: Methodology and algorithm for an efficient and optimally inexpensive
viscoelastic technique, Geophysics, 60, 176–184, 1995. a
Blom, N.: Model of the Central and Eastern Mediterranean upper mantle, TIB, https://doi.org/10.5446/44014, 2019. a
Blom, N. A., Boehm, C., and Fichtner, A.: Synthetic inversions for density
using seismic and gravity data, Geophys. J. Int., 209, 1204–1220,
https://doi.org/10.1093/gji/ggx076, 2017. a, b
Blom, N., Gokhberg, A., and Fichtner, A.: Dataset and model code for Seismic waveform tomography of the Central and Eastern Mediterranean upper mantle, Zenodo, https://doi.org/10.5281/zenodo.3732981, 2020. a
Bozdağ, E., Peter, D., Lefebvre, M., Komatitsch, D., Tromp, J., Hill, J.,
Podhorszki, N., and Pugmire, D.: Global adjoint tomography: first-generation
model, Geophysical Supplements to the Monthly Notices of the Royal
Astronomical Society, 207, 1739–1766, 2016. a
Capdeville, Y., Guillot, L., and Marigo, J. J.: 1-D non periodic
homogenization for the wave equation, Geophys. J. Int., 181, 897–910, 2010. a
Cerjan, C., Kosloff, D., Kosloff, R., and Reshef, M.: A nonreflecting boundary
condition for discrete acoustic and elastic wave equations, Geophysics, 50,
705–708, 1985. a
Channell, J. E. T.: Palaeomagnetism and palaeogeography of Adria, Geol.
Soc. Spec. Publ., 105, 119–132,
https://doi.org/10.1144/GSL.SP.1996.105.01.11, 1996. a
Dahlen, F., Hung, S.-H., and Nolet, G.: Fréchet kernels for
finite-frequency traveltimes – I. Theory, Geophys. J. Int., 141,
157–174, 2000. a
Dewey, J., Helman, M., Knott, S., Turco, E., and Hutton, D.: Kinematics of the
western Mediterranean, Geol. Soc. Spec. Publ.,
45, 265–283, 1989. a
Dziewoński, A. M., Hager, B. H., and O'Connell, R. J.: Large-scale
heterogeneities in the lower mantle, J. Geophys. Res., 82, 239–255, 1977. a
Dziewoński, A. M., Chou, T.-A., and Woodhouse, J. H.: Determination of
earthquake source parameters from waveform data for studies of global and
regional seismicity, J. Geophys. Res.-Sol. Ea., 86,
2825–2852, https://doi.org/10.1029/JB086iB04p02825, 1981. a
Engdahl, E. R., van der Hilst, R., and Buland, R.: Global teleseismic
earthquake relocation with improved travel times and procedures for depth
determination, B. Seismol. Soc. Am., 88,
722–743, 1998. a
Faccenna, C., Piromallo, C., Crespo-Blanc, A., Jolivet, L., and Rossetti, F.:
Lateral slab deformation and the origin of the western Mediterranean arcs,
Tectonics, 23, TC1012, https://doi.org/10.1029/2002TC001488, 2004. a
Fichtner, A.: Full Seismic Waveform Modelling and Inversion, Springer,
Heidelberg, 2010. a
Fichtner, A. and van Driel, M.: Models and Fréchet kernels for
frequency-(in)dependent Q, Geophys. J. Int., 198, 1878–1889, 2014. a
Fichtner, A. and van Leeuwen, T.: Resolution analysis by random probing, J.
Geophys. Res., 120, 5549–5573, https://doi.org/10.1002/2015JB012106, 2015. a
Fichtner, A., Bunge, H.-P., and Igel, H.: The adjoint method in seismology –
I. Theory, Phys. Earth Planet. In., 157, 86–104, 2006. a
Fichtner, A., Kennett, B. L. N., Igel, H., and Bunge, H.-P.: Theoretical
background for continental- and global-scale full-waveform inversion in the
time-frequency domain, Geophys. J. Int., 175, 665–685, 2008. a
Fichtner, A., Kennett, B. L. N., and Trampert, J.: Separating intrinsic and
apparent anisotropy, Phys. Earth Planet. In., 219, 11–20,
2013a. a
Fichtner, A., van Herwaarden, D.-P., Afanasiev, M., Simutė, S., Krischer,
L., Çubuk Sabuncu, Y., Taymaz, T., Colli, L., Saygin, E., Villaseñor,
A., Trampert, J., Cupillard, P., Bunge, H.-P., and Igel, H.: The
Collaborative Seismic Earth Model: Generation 1, Geophys. Res.
Lett., 45, 4007–4016, https://doi.org/10.1029/2018GL077338,
2018. a
Fletcher, R. and Reeves, C. M.: Function minimization by conjugate gradients,
Comput. J., 7, 149–154, 1964. a
French, S. W. and Romanowicz, B. A.: Whole-mantle radially anisotropic shear
velocity structure from spectral-element waveform tomography, Geophys.
J. Int., 199, 1303–1327, https://doi.org/10.1093/gji/ggu334, 2014. a
Gebraad, L., Boehm, C., and Fichtner, A.: Bayesian elastic Full-Waveform
Inversion using Hamiltonian Monte Carlo, EarthArXiv, qftn5, https://doi.org/10.3929/ethz-b-000363317, 2019. a
Godey, S., Bossu, R., and Guilbert, J.: Improving the Mediterranean
seismicity picture thanks to international collaborations, Phys.
Chem. Earth, 63, 3–11, 2013. a
Gokhberg, A. and Fichtner, A.: Full-waveform inversion on heterogeneous HPC
systems, Comput. Geosci., 89, 260–268, 2016. a
Granot, R.: Palaeozoic oceanic crust preserved beneath the Eastern
Mediterranean, Nat. Geosci., 9, 701, https://doi.org/10.1038/ngeo2784, 2016. a
Hjörleifsdóttir, V. and Ekström, G.: Effects of three-dimensional
Earth structure on CMT earthquake parameters, Phys. Earth Planet. In.,
179, 178–190, 2010. a
Hosseini, K.: Global multiple-frequency seismic tomography using teleseismic
and core-diffracted body waves, PhD thesis, Ludwig-Maximillians-Universität, Munich, Germany, 2016. a
Jolivet, L., Brun, J.-P., Gautier, P., Lallemant, S., and Patriat, M.:
3D-kinematics of extension in the Aegean region from the early Miocene to
the present – insights from the ductile crust, B. Soc. Geol. Fr., 165, 195–209, 1994. a
Kanamori, H. and Given, J. W.: Use of long-period surface waves for rapid determination of earthquake-source parameters,
Phys. Earth Planet. In., 27, 8–31,
1981. a
Koulakov, I., Jakovlev, A., Zabelina, I., Roure, F., Cloetingh, S., El Khrepy, S., and Al-Arifi, N.: Subduction or delamination beneath the Apennines? Evidence from regional tomography, Solid Earth, 6, 669–679, https://doi.org/10.5194/se-6-669-2015, 2015. a, b, c
Laske, G., Masters, G., Ma, Z., and Pasyanos, M.: Update on CRUST1.0 – A
1-degree global model of Earth's crust, Geophys. Res. Abstr.,
EGU2013-2658, EGU General Assembly 2013, Vienna, Austria, 2013. a
Legendre, C. P., Meier, T., Lebedev, S., Friederich, W., and Viereck-Götte,
L.: A shear wave velocity model of the European upper mantle from automated
inversion of seismic shear and surface waveforms, Geophys. J.
Int., 191, 282–304, https://doi.org/10.1111/j.1365-246X.2012.05613.x, 2012. a
Luo, Y. and Schuster, G. T.: Wave-equation traveltime inversion, Geophysics,
56, 645–653, 1991. a
Marone, F., Van Der Lee, S., and Giardini, D.: Three-dimensional upper-mantle
S-velocity model for the Eurasia–Africa plate boundary region,
Geophys. J. Int., 158, 109–130, 2004. a
McKenzie, D.: Active tectonics of the Mediterranean region, Geophys.
J. Int., 30, 109–185, 1972. a
McKenzie, D.: Active tectonics of the Alpine–Himalayan belt: the Aegean Sea
and surrounding regions, Geophys. J. Int., 55, 217–254,
https://doi.org/10.1111/j.1365-246X.1978.tb04759.x, 1978. a
Montagner, J. P. and Jobert, N.: Vectorial tomography – II. Application to
the Indian Ocean, Geophys. J., 94, 309–344, 1988. a
Nocedal, J. and Wright, S.: Numerical Optimization, Springer Science &
Business Media, New York, 2006. a
Nuber, A., Manukyan, E., and Maurer, H.: Ground topography effects on
near-surface elastic full waveform inversion, Geophys. J. Int., 207, 67–71,
https://doi.org/10.1093/gji/ggw267,
2016. a
Operto, S. and Miniussi, A.: On the role of density and attenuation in
three-dimensional multiparameter viscoacoustic VTI frequency-domain FWI:
an OBC case study from the North Sea, Geophys. J.
Int., 213, 2037–2059, https://doi.org/10.1093/gji/ggy103, 2018. a, b
Pan, W., Geng, Y., and Innanen, K. A.: Interparameter trade-off quantification
and reduction in isotropic-elastic full-waveform inversion: synthetic
experiments and Hussar land data set application, Geophys. J.
Int., 213, 1305–1333, https://doi.org/10.1093/gji/ggy037, 2018. a, b
Piromallo, C. and Morelli, A.: Imaging the Mediterranean upper mantle by
P-wave travel time tomography, Ann. Geophys.-Italy, 40, https://doi.org/10.4401/ag-3890, 1997. a, b
Piromallo, C. and Morelli, A.: P wave tomography of the mantle under the
Alpine–Mediterranean area, J. Geophys. Res.-Sol. Ea.,
108, 2065, https://doi.org/10.1029/2002JB001757, 2003. a, b, c
Płonka, A., Blom, N., and Fichtner, A.: The imprint of crustal density heterogeneities on regional seismic wave propagation, Solid Earth, 7, 1591–1608, https://doi.org/10.5194/se-7-1591-2016, 2016. a
Portner, D. E., Delph, J. R., Biryol, C. B., Beck, S. L., Zandt, G.,
Özacar, A. A., Sandvol, E., and Türkelli, N.: Subduction termination
through progressive slab deformation across Eastern Mediterranean
subduction zones from updated P-wave tomography beneath Anatolia,
Geosphere, 14, 907–925, 2018. a, b, c
Prieux, V., Brossier, R., Operto, S., and Virieux, J.: Multiparameter full
waveform inversion of multicomponent ocean-bottom-cable data from the Valhall
field. Part 1: Imaging compressional wave speed, density and attenuation,
Geophys. J. Int., 194, 1640–1664, 2013. a
Rawlinson, N. and Spakman, W.: On the use of sensitivity tests in seismic
tomography, Geophys. J. Int., 205, 1221–1243,
https://doi.org/10.1093/gji/ggw084, 2016. a, b
Reilinger, R., McClusky, S., Vernant, P., Lawrence, S., Ergintav, S., Cakmak,
R., Ozener, H., Kadirov, F., Guliev, I., Stepanyan, R., Nadariya, M., Hahubia, G., Mahmoud, S., Sakr, K., ArRajehi, A., Paradissis, D., Al-Aydrus, A., Prilepin, M., Guseva, T., Evren, E., Dmitrotsa, A., Filikov, S. V., Gomez, F., Al-Ghazzi, R., and Karam, G.: GPS
constraints on continental deformation in the Africa-Arabia-Eurasia
continental collision zone and implications for the dynamics of plate
interactions, J. Geophys. Res.-Sol. Ea., 111, B05411, https://doi.org/10.1029/2005JB004051, 2006. a
Ritsema, J., van Heijst, H., and Woodhouse, J. H.: Complex shear wave
velocity structure imaged beneath Africa and Iceland, Science, 286,
1925–1928, 1999. a
Salaün, G., Pedersen, H. A., Paul, A., Farra, V., Karabulut, H., Hatzfeld,
D., Papazachos, C., Childs, D. M., Pequegnat, C., and the SIMBAAD Team:
High-resolution surface wave tomography beneath the Aegean–Anatolia
region: constraints on upper-mantle structure, Geophys. J. Int., 190,
406–420, 2012. a
Schivardi, R. and Morelli, A.: Surface wave tomography in the European and
Mediterranean region, Geophys. J. Int., 177, 1050–1066,
2009. a
Simutė, S., Steptoe, H., Cobden, L., Gokhberg, A., and Fichtner, A.:
Full-waveform inversion of the Japanese Islands region, J. Geophys. Res.,
121, 3722–3741, https://doi.org/10.1002/2016JB012802, 2016. a
Snieder, R.: Large-scale waveform inversions of surface waves for lateral
heterogeneity: 2. Application to surface waves in Europe and the
Mediterranean, J. Geophys. Res.-Sol. Ea., 93,
12067–12080, 1988. a
Spakman, W. and Wortel, R.: A tomographic view on western Mediterranean
geodynamics, in: The TRANSMED atlas. The Mediterranean region from crust
to mantle, 31–52, Springer, Berlin, Heidelberg, 2004. a
Tape, C., Liu, Q., and Tromp, J.: Finite-frequency tomography using adjoint
methods – Methodology and examples using membrane surface waves, Geophys.
J. Int., 168, 1105–1129, 2007. a
Tape, C., Liu, Q., Maggi, A., and Tromp, J.: Seismic tomography of the southern
California crust based upon spectral-element and adjoint methods, Geophys.
J. Int., 180, 433–462, 2010. a
Tarantola, A.: Inversion of Seismic Reflection Data in the Acoustic
Approximation, Geophysics, 49, 1259–1266, 1984. a
Tarantola, A.: A strategy for nonlinear elastic inversion of seismic reflection
data, Geophysics, 51, 1893–1903, 1986. a
Tarantola, A.: Theoretical background for the inversion of seismic waveforms,
including elasticity and attenuation, Pure Appl. Geophys., 128, 365–399,
1988. a
Tromp, J., Tape, C., and Liu, Q.: Seismic tomography, adjoint methods, time
reversal and banana-doughnut kernels, Geophys. J. Int., 160, 195–216, 2005. a
Valentine, A. P. and Woodhouse, J. H.: Reducing errors in seismic tomography:
combined inversion for sources and structure, Geophys. J.
Int., 180, 847–857, 2010. a
Virieux, J. and Operto, S.: An overview of full waveform inversion in
exploration geophysics, Geophysics, 74, WCC127–WCC152, 2009. a
Wang, N., Montagner, J.-P., Fichtner, A., and Capdeville, Y.: Intrinsic versus
extrinsic seismic anisotropy: The radial anisotropy in reference Earth
models, Geophys. Res. Lett., 40, 4284–4288, 2013. a
Weston, J., Engdahl, E. R., Harris, J., Di Giacomo, D., and Storchak, D. A.:
ISC-EHB: reconstruction of a robust earthquake data set, Geophys.
J. Int., 214, 474–484, https://doi.org/10.1093/gji/ggy155, 2018. a
Wortel, M. J. R. and Spakman, W.: Subduction and Slab Detachment in the
Mediterranean–Carpathian Region, Science, 290, 1910–1917,
https://doi.org/10.1126/science.290.5498.1910, 2000. a, b, c
Zielhuis, A. and Nolet, G.: Shear-wave velocity variations in the upper mantle
beneath central Europe, Geophys. J. Int., 117, 695–715, 1994. a
Short summary
We have developed a model of the Earth's structure in the upper 500 km beneath the central and eastern Mediterranean. Within this model, we can see parts of the African tectonic plate that have sunk underneath the European plate over the past tens of millions of years. This model was constructed using seismic waveform tomography by matching the seismograms from many earthquakes recorded at the surface to synthetic seismograms that were generated by simulating earthquake wave propagation.
We have developed a model of the Earth's structure in the upper 500 km beneath the central and...
