Thread: Geophysicist

Started: 2017-01-19 16:40:38
Last activity: 2017-01-19 16:40:38
Robert (Jeff) Anthony
2017-01-19 16:40:38
Institution: KBRwyle
Open Until: 2017-03-19

Geophysicist

LOCATION: Patrick Air Force Base, FL, USA

JOB DESCRIPTION:

The Air Force Technical Applications Center (AFTAC), Directorate of Nuclear Treaty Monitoring (TT), located at Patrick AFB, FL, plans, manages, and coordinates research and development and sustainment for all subsurface and near surface areas (seismic, hydroacoustic, and infrasonic) of the United States Atomic Energy Detection System (USAEDS) and United States National Data Center (USNDC) used in monitoring nuclear test ban treaties. The Directorate plans, organizes, coordinates, and directs mission-area research, design, and development. This position will support an AFTAC/TT Advisory and Assistance Services (A&AS) contract.

The Geophysicist will provide interface with the National Nuclear Security Administration (NNSA)-NA22 labs to accomplish data product deliveries for visiting scientists (to include incorporation of forwarded data and software), and aid in the design, implementation, and population of new research databases for a variety of geophysical and geological data. They will also conduct research into the application of digital imagery and cartographic products from the Geographic Information System (GIS) into TTGR research and development efforts.

RESPONSIBILITIES:
• Discriminant investigation.
• Determination of data corrections.
• Compilation of reference data sets.
• Calibration of discriminants.
• Examination of data/model biases.
• Incorporation of new discriminants into an operational discriminant model.
• Generalized event discrimination methodologies support to the AFATC/TT geophysical mission.
• Interfacing with the NNSA labs in support of a cooperative agreement between AFTAC/TT and the NNSA.
• Answer rapid-response, very applied research questions related to individual special-interest or alert events.
• Produce potential regional P-Wave magnitude scales tied to traditional AFTAC magnitude (mb) for all areas of interest. These are needed for continuity of scale, since with lowering monitoring thresholds smaller events that are only recorded regionally will not have a teleseismic body wave magnitude (mb).
• Investigate ways to reduce scatter in residuals between observed and predicted regional amplitudes used in P/S amplitude ratio discrimination for broad area, including consideration of source mechanism.
• Perform regional moment sensor analysis and coda magnitude analysis for estimating moment magnitude using regional stations.
• Perform spectral ratios between special events using portable and USNDC stations, apply spectral ratios and single event spectra of explosions to model estimated depth of burial and yield.
• Perform travel-time ray-tracing in 3D media including topography for events of interest. Ray scattering and focusing of free-surface reflected phases from near-source sloping topography may provide some support for presence or absence of depth phases observed from events.
• Find earthquake and mining clusters and stage waveforms for several areas of interest: to help with 2D attenuation tomography for coda calibration through the Mayeda coda ratio method, to provide independent constraints on stress drop used in MDAC calibrations for P/S discrimination work, and to provide scaling estimates for source parameters that are used to predict amplitudes of regional phases.
• Perform reverse two station method on the estimation of attenuation of regional body wave phase amplitudes for the evaluation or adding constraints on 2D attenuation tomography work.
• Support development in the use of moment sensors solutions as a long-period source type estimator.
• Research uncertainty estimates on the different moment types and on the resolution of the compensated linear vector dipole (CLVD) component, considering the ratio of the isotropic moment and the deviatoric moment can provide some indication of a seismic event type as an earthquake, explosion or collapse.
• Build events using Analyst Review Station (ARS) for datasets obtained in portable deployments for use as calibration events and store the metadata in a database provide additional coverage for calibration products.
• Use teleseismic P-wave type waveform data to estimate the attenuation of the upper-mantle from waveform modeling t* in the time domain and from spectral analysis for use in yield estimation.
• Generate regional 1D travel-time model estimates and test 2.5D travel-time estimates using record sections generated using arrival-time data and waveforms.
• Prepare Trip Reports and Pre-Period Plan Reports.
• Prepare and present briefings.

EDUCATION:
• Minimum: Bachelor of Science in a scientific or technical field; Geophysics, Geology, Seismology, Physics, Imagery, Cartographer, Geographic Information Systems.
• Preferred: Master of Science or Ph.D. in Geophysics, Physics, or Seismology.

REQUIRED SKILLS AND EXPERIENCE:
• Minimum of 10 years of relevant experience performing tasks similar to those above.
• Documented expertise in geology, regional seismic analysis and seismic event screening to produce bulletins and/or reports and to test new analysis tools.
• Documented expertise in noise data analyses and calibration analyses.
• Documented technical expertise in seismic, hydroacoustic, and infrasonic systems research and required documentation for program execution.
• Familiar with data acquisition formats including: Conference on Disarmaments (CD) 1.1, Center for Seismic Studies (CSS), Standard for Exchange of Earthquake Data (SEED), mini-SEED, Society for Exploration Geophysics (SEG)-Y, Seismic Analysis Code (SAC), Acquisition and Viewing Executive (XAVE), Visual Trace Analyzer (VIXTA), GSE Open Station software, Data Collection Center (DCC).
• General experience using Microsoft Office products including Excel, Power Point, and Word.
• Strong interpersonal and communication skills necessary to communicate with executives.
• Experience work within a government Sensitive Compartmented Information Facility (SCIF).
• Experience deriving and marking classified documents according to the National Industrial Security Program (NISPOM) and security classification guides.

DESIRED SKILLS:
• Experience using Microsoft SharePoint.
• AFTAC experience.

OTHER:
• US Citizenship required.
• Department of Defense Security Clearance required.

Apply online at: https://kbr.taleo.net/careersection/kbrwyle_external/jobdetail.ftl?job=1048372
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