NPGS Monthly Dinner Meeting – RSVP by Feb. 2nd

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Nevada Petroleum & Geothermal Society Monthly Dinner Meeting:

Ileana Tibuleac—Thursday, February 4, 2016 at 6:30 p.m.
Development of a Low Cost Method to Estimate the Seismic Signature of a Geothermal Field from Ambient Seismic Noise Analysis

Ramada Reno Hotel
1000 East 6th Street, Reno, NV 89512
Hosted Cocktail Reception 6:30, Skyline Bar, 14th Floor
Dinner Served at 7:00 PM
NPGS Members $20, Non-Members $23, Students $10

SPEAKER: Ileana Tibuleac, PhD; Research Seismologist, Assistant Professor, UNR

TOPIC:  Development of a Low Cost Method to Estimate the Seismic Signature of a Geothermal Field from Ambient Seismic Noise Analysis

Abstract: A new, cost effective and non-invasive exploration method using ambient seismic noise has been tested at Soda Lake, NV. It was demonstrated that, with the advantage of S-velocity models, a passive seismic reflection survey, although with lower resolution, reproduces the results of the active survey when the ambient seismic noise is not contaminated by cultural noise. Ambient noise resolution is less at depth (below 1500m) compared to the active survey. In general, the results are very promising and useful information can be recovered from ambient seismic noise, including dipping features.

A 2D shear wave velocity model has been obtained for the first time in Soda Lake using surface waves extracted from ambient seismic noise at depth higher than the depth of a typical reflection survey. Through innovative signal processing techniques, periods not typically recorded with high frequency sensors were analyzed in this study to obtain seismic velocity model information.

New seismic parameters such as entropy, stochastic parameters (Correlation Length and Hurst number) and spectral features extracted from active and passive surveys have high potential to indicate geothermal favorability through their correlation with high temperature anomalies and are indicators of faults, thus reducing the uncertainty in fault identification.

Biography: Ileana is a research seismologist, with a faculty position at assistant professor level, at the Nevada Seismological Laboratory, University of Nevada, Reno (UNR). Ileana received a Ph. D. in Geophysics from Southern Methodist University in May, 1999, with a dissertation entitled: “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.” Ileana’s graduate adviser was Dr. Eugene Herrin. An article with the same title, one of the three in my thesis, was published in the journal Science.

Ileana recently (2014) finished work on a Master in Business Administration (MBA) in the part time program at the University of Nevada Reno.[]

Cocktail Reception Hosted by: Paul Graham Drilling and GEO Drilling Fluids

Please RSVP for the Dinner Meeting by Tuesday, Feb 2 with the following link:[]

If you find that you cannot attend, please email Vicki Ehni at or call at 775-720-6387.

NPGS will be charged for all no shows. Thank you for your consideration.

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