Jordi Julià

My research interests lie in solid-earth geophysics, specifically in passive-source seismic imaging of the continental lithosphere.

During my Ph.D. work at the Universitat de Barcelona, I developed a joint inversion of receiver functions and surface-wave dispersion velocities that yields robust estimates of local S-wave velocity variation with depth. I have applied this technique to the Arabian Shield and the Tanzania Craton, and I have obtained interesting results about anomalously thin lithosphere near the Read Sea and uniform composition of the lower crust through Precambrian terranes of varying age in East Africa.

My current research at the University of South Carolina includes a teleseismic investigation of the Indian subcontinent, the seismic imaging of the deep structure beneath the Sierra Nevada batholit with cross-correlated ambient seismic noise and S-wave receiver functions, and the development of a new receiver function technique to constrain density contrasts at seismic discontinuities.

Publications

  • J. Julià, J. Vila, and R. Macià. The receiver structure beneath the Ebro Basin, Iberian Peninsula. Bull., Seis. Soc. Am., 88:1538–1547, 1998.
  • J. Julià, C.J. Ammon, R.B. Herrmann, and A.M. Correig. Joint inversion of receiver functions and surface-wave dispersion observations. Geophys. J. Internat., 143:99–112, 2000.
  • J. Julià, C.J. Ammon, and R.B. Herrmann. Lithospheric structure of the Arabian Shield from the joint inversion of receiver functions and surface-wave group velocities. Tectonophysics, 371:1–21, 2003.
  • J. Julià and J. Mejía. Thickness and vp/vs ratio variation in the Iberian crust. Geophys. J. Internat., 156:59–72, 2004.
  • J. Julià, C.J. Ammon, R.B. Herrmann, and A. Akinci. Evaluation of deep sediment velocity structure in the new madrid seismic zone. Bull., Seis. Soc. Am., 94:334–340, 2004.
  • M.T. Dugda, A.A. Nyblade, J. Julia, C.A. Langston, C.A. Ammon, and S. Simiyu. Crustal structure in Ethiopia and Kenya from receiver function analysis. J. Geophys. Res., 110(B1):doi:10.1029/2004JB003065, 2005.
  • J. Julià, C.J. Ammon, and A.A. Nyblade. Evidence for mafic lower crust in Tanzania, East Africa, from joint inversion of receiver functions and Rayleigh wave dispersion velocities. Geophys. J. Internat., 162:555–569, 2005.
  • J. Julià, F. Mancilla, and J. Morales. Seismic signature of intracrustal magmatic intrusions in the Eastern Betics (internal zone), SE Iberia. Geophys. Res. Lett., 32:L16304, 2005.
  • J. Julià. Constraining velocity and density contrasts across the crust-mantle boundary with receiver function amplitudes. Geophys. J. Internat., 2007, in press.
  • J. Julià, T.J. Owens, and S.S. Rai. Lateral variation of the 660-kilometer discontinuity beneath india: A very deep continental root? Geophys. Res. Lett., 2007, in review.
  • M.T. Dugda, A.A. Nyblade, and J. Julia. Thin lithosphere beneath the Ethiopian Plateau revealed by a joint inversion of Rayleigh wave group velocities and receiver functions. J. Geophys. Res., submitted, 2007.

Contact Information

Office Phone:
(803)777-4531
Fax:
(803)777-0906
Email