Office address : Southern Methodist University,
Department of Geological Sciences,
Dallas, TX-75275-0395,
tel: (214)-768-2747, fax: 214-768-4291

e-mail address: ileana@passion.isem.smu.edu

Citizenship  Romanian
 

EDUCATION

Ph.D. in Geophysics, SOUTHERN METHODIST UNIVERSITY Dallas, TX.,
   15 May 1999, Overall GPA: 3.827/4.0 scale.
       Thesis: Array  Measurements of P and PcP Slowness Residuals with
        Implications for Lateral Heterogeneity in the Lower Mantle beneath
        the Caribbean Sea and Other Geophysical Studies
Master of Science in Nuclear Physics, BUCHAREST UNIVERSITY, ROMANIA,
   July, 1988, Overall GPA: 9.80/10.0 scale.
       Thesis: Thorium Utilization in Nuclear Plants
Bachelor of Science in Physics, BUCHAREST UNIVERSITY, ROMANIA.
    July 1986

LANGUAGES
English, French, Romanian

 PROFESSIONAL EXPERIENCE

SOUTHERN METHODIST UNIVERSITY Post doctoral Fellow, 15 May 1999 - present
Research interests include:

SEISMIC ARRAYS CALIBRATION
Currently calibrating the NVAR seismic array.
Assessing the location capability for events near the Nevada Test Site.
Quantifying the effect of elevation, geology and source azimuth
on array locations and signal/noise level at search site.

LOWER MANTLE HETEROGENEITY
Using P, PcP and other deep phases to better constrain the
lower mantle heterogeneity described in previous studies under the Caribbean Sea.
Using events recorded at all available arrays:  TXAR, YKA, NVAR.
Working on alternative models for the shape of the anomaly.

INFRASOUND ARRAYS
I am part of a team working on noise reduction for infrasound arrays
and infrasound signal characterization and discrimination.

 
WAVELETS IN GEOPHYSICS
Continuing the study for developing a wavelet based method for
dominant wavelength identification in time series.
Extending the method to isotope data in ancient ice cores.

DISCRIMINATION STUDIES
Presently working on discrimination between simultaneous
and delay-fired explosions.   Investigating the dependence of Lg waves characteristics
on the type of source, using wavelet transforms and fractal dimension of the Lg envelopes.
 

SOUTHERN METHODIST UNIVERSITY Research Assistant, 1994-1999.
Research accomplished:

LOWER MANTLE HETEROGENEITY
Mapped anomalous slowness residuals (2-3 s/deg) and azimuth residuals
of P and PcP waves from teleseismic events, recorded at TXAR and YKA seismic arrays.
The residuals analyzed were statistically significant and had definite patterns,
with changes of sign between adjacent regions, and were not reflected in travel time residuals.
Observed large PcP but no P slowness residuals unless the rays were turning deep into the lower mantle.
Demonstrated that the anomalies beneath the Caribbean Sea originate in the lower mantle.
Using ray tracing through a 2-D section between 100 - 120 degrees azimuth, SE of TXAR,
from the surface to the core and up to an epicentral distance of 80 degrees quantitatively
described the heterogeneity. The starting model used originated in tomographic studies of
heterogeneity in the lower mantle in the region.

WAVELETS IN SEISMOLOGY
Developed a new automatic method for timing Lg arrivals using wavelet transforms
to decompose the Lg signal into its components localized both in time and scale.

WAVELETS IN PLANETOLOGY
Applied signal processing techniques and wavelet transforms to digital Magellan SAR
data from Venus to determine dominant wavelengths in various types of ribbon terrain.

SEISMO-ACOUSTIC GROUND TRUTHING
Using wavelets transforms, worked on array processing of meteors and space shuttle seismo-acoustic signals.

DIGITAL SEISMIC DATA PROCESSING
Worked on calibration of the TXAR (Lajitas, Texas) seismic array.
Improved the efficiency of the standard crosscorrelation method by using Fourier interpolation
to obtain a higher virtual sample rate, and using an L1 norm and a moving window.
Determined, to the first order, the attitude of the Moho discontinuity beneath TXAR.

BUCHAREST UNIVERSITY, Bucharest, Romania,
Assistant Professor, Mechanics, Thermodynamics and Physics of the Earth Department, 1990 - 1994.
Teaching experience:
 - "Classical Mechanics" seminar and laboratory for first year students
 - "Molecular Physics and Heat" seminar and laboratory for first year students
 -"Computer Modeling" for second year students of the French Language section
Research experience:
 -studies of seismicity parameters in Vrancea Region, Romania
 

INSTITUTE OF ATOMIC PHYSICS, BUCHAREST,
Amorphous Magnetic Materials Laboratory, 1988-1990:
Measured the thickness of thin layers of Fe and Al deposed by sputtering in AC
and radio-frequency, using quartz crystals and fringes of equal chromatic order methods.

Nuclear Reactor Department, 1986, (practical experience for undergraduate students) :
Performed neutron flux measurements in the nuclear reactor
 

RELEVANT COURSES

Applied Geophysical and Theoretical Geophysics, including;
** Theoretical Seismology **Heat Flow- Conduction**Digital Data Processing
**Inversion Theory**Heat Flow- Convection **Isotope Geochemistry
**Statistics for Engineers and Scientists

Workshops and Short Courses

Fourth Workshop on 3-D Modeling of Earth Structure and Earthquake Source Processes,
Trieste, Italy, September 28th - October 9th, 1998

Workshop Course on Wavelets and Filter Banks, Boston, May 20-22 1998,
taught by Gilbert Strang (MIT) and Truong Nguyen (Boston University)

SAGE - Summer of Applied Geophysical Experience, June-July 1995

Examinations taken as Doctoral degree requirements at the Center for Physics of the Earth in Bucharest (1991-1994)
**Seismic Wave Propagation **Seismic Source Theory

Courses taken as Physics Master Degree requirements at the Bucharest University (more than 50 hours)
**Mathematical Analysis and Algebra **Mechanics and Acoustics** Molecular Physics**Electricity and Magnetism
**Chemistry **Materials Technology**Equations of Mathematical Physics
**Analytical Mechanics and of Deforming Media **Optics **Physics of Atoms and Molecules**Nuclear Physics
**Physics of Electronic Devices and Circuits**Electrodynamics and Theory of Relativity **Quantum Mechanics
** Physics of Solid State**Physics of Nuclear Reactors **Spectral Methods of Analysis and Control**Utilization of Nuclear Radiation**Thermodynamics and Statistical Physics
 

COMPUTERS

UNIX and DOS/WINDOWS Platforms; 6 years+ experience
MATLAB, GEOTOOL, SEISTOOL
   MacRay v.1.06 for computing travel time curves for 2-D velocity models
Database(s) FOXPRO
 

HONORS AND ACTIVITIES

Awarded a National Science Foundation Fellowship for attending the Fourth Workshop
on 3-D Modeling of Earth Structure and Earthquake Source Processes, Trieste, Italy, September 28th - October 9th, 1998

Awarded the Republican Fellowship for outstanding college students,1987

Awarded first prize at the National Physics Competition (for high school students) in 1980 and Second Prize in 1981

Intramural: basketball, ballroom dance; rollerblading, ski, tennis
 

ORGANIZATIONS

   Seismological Society of America
   American Geophysical Union
   Sigma Chi Scientific Research Society
 
 
 

REFERENCES

Available upon request.
 

PUBLICATIONS

Papers

Tibuleac, I. M. and E.T. Herrin, (2000), Location Capability at NVAR (Mina, Nevada) Seismic Array for Events Near the Nevada Test Site, submitted to Seismological Research Letters.

Tibuleac, I. M. and E.T. Herrin, (1999), Lower Mantle Heterogeneity Beneath the Caribbean Sea, Science, 285, 1711 - 1715.

Tibuleac, I. M. and E.T. Herrin, (1999), "An Automatic Method for Determination of Lg Arrival Times Using Wavelet Methods", Seismological Research Letters, 70, 577 - 595.

Tibuleac, I. M. and Herrin, E, (1997), Calibration Studies at TXAR, Seismological Research Letters, 68, 353-365.

Selected Abstracts

Tibuleac, Ileana and Herrin, E. T., Lower Mantle Heterogeneity Inferred from Teleseismic P and PcP Slowness recorded at TXAR (Lajitas, Texas) and YKA (Yellowknife, Canada) Seismic Arrays, AGU Spring, Washington DC, May 30 - June 3, 2000.

Tibuleac, Ileana, Negraru P., E. T. Herrin, (2000) Calibration Studies at NVAR (Mina, Nevada) Seismic Array submitted to the SSA Annual Meeting, San Diego, CA, April 2000.

Tibuleac, Ileana and Herrin, E. T., (1999), Location Capability at the Mina, Nevada, Seismic Array, (1999),
submitted to the AGU Fall Meeting, 13 - 17 December, 1999.

Ghent, Rebecca and Tibuleac, Ileana, (1999), Determining Ribbon Structural Wavelengths in Magellan SAR
Images using 1D Wavelet Transforms combined with 1D FFT, submitted to the AGU Fall Meeting, 13 - 17 December, 1999.

Golden P., Bonner, J., Herrin, E. T, Tibuleac, Ileana, Swanson, J., Sorrels, G., Hayward, C., Stump, B., and Anderson, D., (1999),
Installation of the Mina, Nevada, Seismic and Acoustic Arrays, in Proceedings of the 21'st Seismic Research Symposium:
Technologies for Monitoring the Comprehensive Nuclear Test Ban Treaty, 21 - 24 September 1999, Las Vegas, Nevada, 1, 438 - 448

Herrin E. T., Bonner, J.,Golden P., Hayward, C., Sorrells, G., Swanson, J., Tibuleac, I.,M. (1998),
"Reducing False Alarms with Seismo-Acustic Synergy", Proceedings of the 20-th
Annual Seismic Research Symposium on Monitoring a Comprehensive Test Ban Treaty,
21-23 September 1998, pp. 580-589.

Ileana M. Tibuleac, E. T. Herrin, P. Golden, (1995),"Calibration Studies at TXAR ",
Proceedings of the 17-th Annual Seismic Research Symposium Monitoring a
Comprehensive Test Ban Treaty, 12-15 September 1995, pp. 319-328.

Ileana M. Tibuleac, E. T. Herrin, P. Golden, (1995), "Calibration Studies at TXAR",
Proceedings of the CTBT Monitoring Technologies Conference, 15-18 May 1995, S-1P.
 

Technical Reports

 Bonner J., Sarah Deering, Tao Liu, Swanson J. and Ileana Tibuleac,
Seismic and acoustic data observations at TXAR, January 1997.

Ileana Tibuleac and Eugene Herrin, (1996), Calibration Studies at TXAR,
in Regional Discrimination Studies, Scientific report No. 1, April 1996, pp. 16-33.

 Herrin, E., Burlacu, V., Tibuleac, I. M., Hayward, C., Bonner, J., Golden, P.,
and Sorrels, G., (1995), Seismo-Acoustic Synergy, in Herrin, E., Golden, P.,
and Robertson, E., Eds., Design, Evaluation, and Construction of TEXESS and
LUXESS, and research in mini-array technology and use of data from single
stations and sparse networks: phase V, SMU Scientific Report No. 5, 41-71.
 

Presentations

"Calibration and Location Methods at the TXAR (Lajitas, Texas) and NVAR (Mina, Nevada) Seismic Arrays", presented ar the University of Alaska at Fairbanks, April 20 , 2000.

"Calibration and Location Methods at the TXAR (Lajitas, Texas) and NVAR (Mina, Nevada) Seismic Arrays", presented ar the Center for Monitoring Research, Washington DC, 22 Jan. 2000.

"Study of Anomalous Teleseismic P and PcP Slowness and Azimuth Residuals",
Ileana Tibuleac and E. T. Herrin, Poster Session at the American Geophysical
Union 1998 Fall Meeting,  Dec 6 - 10 1998, San Francisco, California.

"A Signal Processing Approach to Wavelength Analysis of Ribbon Terrain on Venus",
Rebecca Ghent and Ileana Tibuleac, Poster Session at  the American Geophysical Union 1998 Fall Meeting,
Dec 6 - 10 1998, San Francisco, California.

"Study of Anomalous Teleseismic P and PcP Slowness and Azimuth Residuals",
Ileana Tibuleac and E. T. Herrin, Poster Session at the American Geophysical Union
1998 Spring Meeting, May 26 - 29 1998, Boston, Massachusetts.

"An Automatic Method for Determination of Lg Arrival Times Using Wavelet Methods",
Ileana Tibuleac and E.T. Herrin, Poster Session at the Seismological Society of
America 93'rd Annual Meeting, 1998, Boulder, Colorado.

"Array Measurements of Teleseismic P and PcP Slowness and Azimuth residuals
with implications for Lateral Heterogeneity in the Lower Mantle ", Ileana Tibuleac
and E.T. Herrin, Poster session at the Seismological Society of America 92nd Annual Meeting,
April 9-11, 1997, Honolulu, Hawaii.

"Array Measurements of Teleseismic P and PcP Slowness and Azimuth residuals
with implications for Lateral Heterogeneity in the Lower Mantle ",
Poster session at SMU Dedman College graduate student research day, February, 1996.

"Calibration Studies at TXAR ", Poster session at SMU Dedman College graduate student research day, February, 1995.

"Anomalous behavior of the seismicity parameters before large earthquakes in Vrancea Region, Romania",
presented at the Second International Workshop in Statistical Seismology, 1-5 June 1993, Cephallonia, Greece