Ph.D.

Rudolf Widmer-Schnidrig

Scientific Employee
Black Forest Observatory (BFO)

Contact

+49 (0)7836-2151

Website
Business card (VCF)

BFO, Heubach 206
77709 Wolfach
Germany

Subject

My main research interest is in low-frequency seismology: observing the elasto-gravitational free oscillations of the Earth to infer mantle and core structure. Since 2000 I work at the Black Forest Observatory (BFO) where we operate sensors to observe the entire geodynamic spectrum in gravity, strain and tilt. At BFO we also tested seismometers for the InSight mission to Mars and I am now involved in the analysis of these data to study the martian interior. Most recently I have also searched for the signature of compact dark matter objects (CDOs) in terrestrial gravimeter data.

  1. 2019

    1. Ringler, A. T., Steim, J., Wilson, D. C., Widmer-Schnidrig, R., & Anthony, R. E. (2019). Improvements in seismic resolution and current limitations in the Global Seismographic Network. Geophysical Journal International, 220(1), 508–521. https://doi.org/10.1093/gji/ggz473
    2. Lognonné, P., SEISteam, & Widmer-Schnidrig, R. (2019). SEIS: Insight’s Seismic Experiment for Internal Structure of Mars. Space Sci Rev, 215(12). https://doi.org/10.1007/s11214-018-0574-6
    3. Widmer-Schnidrig, R., Wielandt, E., Verdier, N., Lognonné, P., Pike, T., & SEISteam. (2019). Time Domain Modeling of InSight/SEIS VBB and SP Frequency Calibrations on Earth and on Mars. Retrieved from https://www.gis.uni-stuttgart.de/forschung/doc/Widmer_2019.pdf
  2. 2018

    1. Spiga, A., Banfield, D., Teanby, N. A., Forget, F., Lucas, A., Kenda, B., … Banerdt, W. B. (2018). Atmospheric Science with InSight. Space Science Reviews, 214, 109. https://doi.org/10.1007/s11214-018-0543-0
  3. 2017

    1. Brunke, H.-P., Widmer-Schnidrig, R., & Korte, M. (2017). Merging fluxgate and induction coil data to produce low-noise geomagnetic observatory data meeting the INTERMAGNET definitive 1 s data standard. Geosci. Instrum. Method. Data Syst., 1--7. https://doi.org/10.5194/gi-6-1-2017
  4. 2014

    1. Zhang, Y., Widmer-Schnidrig, R., & Sneeuw, N. (2014). Coherency analysis between superconducting gravimeters at BFO and Strasbourg. Jahrestagung der Deutschen Geophysikalischen Gesellschaft (DGG), Karlsruhe, Germany.
    2. Widmer-Schnidrig, R., & Schwaderer, U. (2014). Sensitivity of Modern Broad-Band Seismometers at High Frequencies - Evaluation of a Huddle Test at BFO. Annual Meeting of the German Geophysical Society, DGG, Poser presentation, 1.
  5. 2013

    1. Zhang, Y., Widmer-Schnidrig, R., & Sneeuw, N. (2013). Can SGs be used to validate GRACE Gravity Field Models? -- Coherency Analysis between SGs at BFO and Strasbourg. IAG Scientific Assembly, Potsdam, Germany.
  6. 2012

    1. Häfner, R., & Widmer-Schnidrig, R. (2012). Signature of 3-D density structure in spectra of the spheroidal free oscillation 0S2. Geophysical Journal International, 192(1), 285–294. Retrieved from https://doi.org/10.1093/gji/ggs013
  7. 2010

    1. Kurrle, D., & Widmer-Schnidrig, R. (2010). Excitation of long-period Rayleigh waves by large storms over the North Atlantic ocean. Geophys. J. Int., 183, 330--338.
    2. Forbriger, Th., Widmer-Schnidrig, R., Wielandt, E., Hayman, M., & Ackerley, N. (2010). Magnetic field background variations can limit the resolution of seismic broad-band sensors. Geophys. J. Int., 183, 303--312.
    3. Widmer-Schnidrig, R., Duffner, P., Forbriger, Th., & Zürn, W. (2010). The New Dual Sphere Superconducting Gravimeter at the Black Forest Observatory. Annual Meeting of the German Geophysical Society, DGG, Poser presentation, 1.
  8. 2009

    1. Widmer-Schnidrig, R., & Zürn, W. (2009). Perspectives for Ring Laser Gyroscopes in Low-Frequency Seismology. Bull. Seismol. Soc. Am., 99, 1199--1206.
  9. 2008

    1. Kurrle, D., & Widmer-Schnidrig, R. (2008). The horizontal hum of the Earth: A global background of spheroidal and toroidal modes. Geophys. Res. Lett., 35, L06304, doi:10.1029/2007GL033125.
  10. 2007

    1. Laske, G., & Widmer-Schnidrig, R. (2007). Theory & Observations: Normal Modes & Surface Wave Measurements. Treatise on Geophysics, Vol. 1: Seismology and Structure of the Earth, B. Romanowicz and A. Dziewonski, Editors, Elsevier, 67--125.
  11. 2006

    1. Widmer-Schnidrig, R. (2006). Evaluation of installation methods for STS-2 seismometers. Seismol. Res. Lett., submitted.
    2. Widmer-Schnidrig, R., & Kurrle, D. (2006). Evaluation of installation methods for STS-2 seismometers. Poster at the Annual Meeting of the German Geophysical Society , DGG, Bremen.
    3. Kurrle, D., & Widmer-Schnidrig, R. (2006). Spatiotemporal features of the Earth’s background oscillations observed in central Europe. Geophys. Res. Lett., 33, L24304, doi:10.1029/2006GL028429.
  12. 2003

    1. Zumberge, M. A., Berger, J., Hedlin, M. A. H., Husmann, E., Nooner, S., Hilt, R., & Widmer-Schnidrig, R. (2003). An optical infrasound sensor: a new lower limit on the atmospheric pressure noise between 1 Hz and 10 Hz. J.  Acoust. Soc. Am., 113, 2474--2479.
    2. Zürn, W., & Widmer-Schnidrig, R. (2003). Vertical acceleration noise at seismic frequencies. Cahiers Du Centre Européen de Géodynamique et de Séismologie, 22, 123--128.
    3. Widmer-Schnidrig, R. (2003). What can Superconducting Gravimeters contribute to normal mode seismology? Bull. Seismol. Soc. Am., 93, 1370--1380.
  13. 2002

    1. Zürn, W., Bayer, B., & Widmer-Schnidrig, R. (2002). A 3.7 mHz gravity signal on June 10, 1991. Bull. d’Information Marées Terrestres, 135, 10717--10724.
    2. Widmer-Schnidrig, R. (2002a). Application of regionalized multiplet stripping to retrieval of aspherical structure constraints. Geophys. J. Int., 148, 201--213.
    3. Zürn, W., & Widmer-Schnidrig, R. (2002). Globale Eigenschwingungen der Erde. Physik Journal Der Deutschen Physikalische Gesellschaft, 1, 49--55.
    4. Wielandt, E., & Widmer-Schnidrig, R. (2002). Seismic sensing and data acquisition in the GRSN. Ten Years of the German Regional Seismic Network (GRSN),                    Wiley-Vch Publisher, Edited by Michael Korn.                    Http://Www.Geophys.Uni-Stuttgart.de/$\sim$widmer/Wws.Pdf, 73--83.
    5. Widmer-Schnidrig, R. (2002b). What can Superconducting Gravimeters contribute to normal mode seismology? Bull. d’Information Marées Terrestres, 135, 10701--10711.
  14. 2001

    1. Widmer-Schnidrig, R. (2001). Untersuchungen zur Anregung der permanent angeregten Eigenschwingungen der Erde. 61. Jahrestagung Der Deutschen Geophysikalischen Gesellschaft, Frankfurt Am Main, 148.
  15. 2000

    1. Zürn, W., Laske, G., Widmer-Schnidrig, R., & Gilbert, J. F. (2000). Observation of Coriolis coupled modes below 1 mHz. Geophys. J. Int., 143, 113--118.
  16. 1999

    1. Zürn, W., Widmer-Schnidrig, R., & Bourguignon, S. (1999). Efficiency of air pressure corrections in the BFO records of the Balleny Islands earthquake, March 25, 1998. Bull. d’Information Marées Terrestres, 131, 10183--10194.
    2. Widmer-Schnidrig, R. (1999). Free oscillations illuminate the mantle. Nature, 398, 292--293.
  17. 1997

    1. Riede, M., Zürn, W., & Widmer, R. (1997). Application of multiple tapers to tidal analysis. Proceedings 13th International Symposium on Earth Tides.
    2. Zürn, W., & Widmer, R. (1997). World-wide observation of bichromatic long-period Rayleigh waves excited during the June 15, 1991 eruption of Mount Pinatubo. Fire and Mud: The 1991--1992 Eruptions of Pinatubo Volcano, Philippines, Editors.  R.S. Punongbayan and C.G. Newhall, Washington University Press, 615--624.
  18. 1996

    1. Sobolev, S. V., & Widmer, R. (1996). 1-D upper mantle structure: GA based normal mode inversions vs. petrological predictions. European Geophysical Society, EGS96, Den Haag.
    2. Widmer, R., & Sobolev, S. V. (1996). Degenerate frequencies estimated from recent large earthquakes: new constraints for 1-D Earth models. European Geophysical Society, EGS96, Den Haag.
  19. 1995

    1. Sobolev, S. V., Babeyko, A. Yu., & Widmer, R. (1995). 3-D Temperature and composition in the upper mantle as constrained by global seismic tomography and mineral physics. VI. International Kimberlite Conference, Novosibirsk, Russia.
    2. Zürn, W., Widmer, R., Wenzel, H.-G., & Richter, B. (1995). Comparison of Free Oscillation Spectra from different Instruments. Bull d’Information Marrées Terrestres, 122, 9173--9179.
    3. Masters, T. G., & Widmer, R. (1995). Free-oscillations: frequencies and attenuations. Global Earth Physics: A Handbook of Physical Constants, Th. J. Ahrens, Editor, American Geophysical Union, Washington D.C., 104--125.
    4. Zürn, W., & Widmer, R. (1995). On noise reduction in vertical seismic records below 2 $mHz$ using local barometric pressure. Geophys. Res. Lett., 22, 3537--3540.
    5. Widmer, R., & Zürn, W. (1995). The 1994 Kurile event: a chance to revisit the modes $_0S_0$ and $_0T_2$. EOS Trans. AGU, 76, 304.
  20. 1994

    1. Röhm, A., Widmer, R., & Zürn, W. (1994). Anregung atmosphärischer Resonanzen durch vulkanische Eruptionen. 54. Jahrestagung Der DGG, Münster, 175.
    2. Widmer, R. (1994). Eigenschwingungen und die langwellige Struktur der Erde. Invited Talk, 54. Jahrestagung Der DGG, Münster, 164.
    3. Widmer, R., Masters, G., & Gilbert, F. (1994). New constraints for 1-D Earth structure: multiplet stripping applied to the 1994 deep Fiji and Bolivian events. EOS Trans. AGU, 75, 469.
    4. Dreier, R., Widmer, R., Zürn, W., & Schick, R. (1994). Stacking of broad-band seismograms of shocks at Stromboli. Acta Volcanologica, Vol. 5, 165--172.
    5. Masters, G., Um, J., Gilbert, F., Widmer, R., & P., D. (1994). The impact of the Bolivian Earthquake on free-oscillation seismology. EOS Trans. AGU, 75, 471.
  21. 1992

    1. Widmer, R., & Zürn, W. (1992a). Bichromatic excitation of long-period Rayleigh and air waves by the Mount Pinatubo and the El Chichón volcanic eruptions. Geophys. Res. Lett., 19, 765--768.
    2. Widmer, R., & Zürn, W. (1992b). Excitation of Atmospheric Normal Modes by Plinian Eruptions. EOS Trans. AGU, 73, 635.
    3. Widmer, R., Masters, G., & Gilbert, F. (1992a). Feinstruktur von Eigenschwingungsspektren und 3-D Struktur im Erdkern. Verhandl. Deutsche Geophysik. Ges. (Abstract), Leipzig.
    4. Widmer, R., Masters, G., & Gilbert, F. (1992b). Observably split multiplets -- data analysis and interpretation in terms of large-scale aspherical structure. Geophys. J. Int., 111, 559--576.
    5. Widmer, R., Zürn, W., & Masters, G. (1992). Observation of low order toroidal modes from the 1989 Macquarie rise event. Geophys. J. Int., 111, 226--236.
  22. 1991

    1. Widmer, R., Masters, G., & Gilbert, F. (1991a). Anomalously split modes: observational constraints on the 3-D structure of the deep Earth. Biannual Meeting of the International Union of Geodesy and Geophysics, Vienna.
    2. Widmer, R., Masters, G., & Gilbert, F. (1991b). Spherically symmetric attenuation within the Earth from normal mode data. Geophys. J. Int., 104, 541--553.
    3. Widmer, R. (1991). The large-scale structure of the deep Earth as constrained by free oscillation observations. Ph.D. Thesis, University of California San Diego.
  23. 1990

    1. Widmer, R., Masters, G., & Gilbert, F. (1990a). Anomalously split modes: New observations and possible causes. EOS Trans. AGU, 71, 1479.
    2. Widmer, R., Masters, G., & Gilbert, F. (1990b). The long-period moment tensor of the Loma Prieta earthquake from IRIS/IDA data. EOS Trans. AGU, 71, 1479.
  24. 1988

    1. Widmer, R., Masters, G., & Gilbert, F. (1988a). The spherical Earth revisited. Terra Cognita, 8, 156.
    2. Widmer, R., Masters, G., & Gilbert, F. (1988b). The spherically symmetric Earth: Observational aspects and Constraints on new models. EOS Trans. AGU, 69, 1310.
  25. 1985

    1. Sabadini, R., Yuen, D. A., & Widmer, R. (1985). Constraints on short-term mantle rheology from the $J_2$ observation and the dispersion of the 18.6 y tidal Love number. Physics of the Earth and Planetary Interiors, 38, 235--249.
    2. Buland, R., Yuen, D., Konstanty, K., & Widmer, R. (1985). Source phase shift: A new phenomenon in wave propagation due to anelasticity. Geophys. Res. Lett., 12, 569--572.
    3. Widmer, R. (1985). Toroidal modes of an anelastic Earth. Diplomarbeit an der Eidgenössischen Technischen Hochschule, Zürich.
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