CV

Software Engineer - Data Analysis/Data Mining/Machine Learning

Research Assistant

Built Fortran and Python pipelines to process and organize 48 TB of raw seismic time-series data
Implemented signal processing techniques to identify temporal and spatial patterns in continuous raw seismic data
Developed parallelized code to separate coherent spatial signals from noise
Performed conjugate gradient optimization and hyperparameter exploration analysis for a weighted least squares problem to generate high-resolution models of subsurface velocity structure, which are critical for earthquake hazard analysis and continuous subsurface monitoring

Research Intern

Created MATLAB code to model the effect of broadband seismic technology on critical hydrocarbon indicators and compared results to field data
Predicted reservoir rock properties from spatial well log data using rock physics models
Presented findings and outlined suggestions for improved evaluation of new technology to a company-wide audience, including team supervisors and managers

Research Intern

Leveraged open-source software to manage seismic data and model subsurface structures
Developed Python script to shorten the time between acquisition and quality control of seismic data
Contributed visualization and interpretation of results to final written reports distributed to clients

Student Assistant

Developed a MATLAB script for visualization of 3D magnetotelluric inversion results
Produced a thorough user’s manual for the software

Participant

Investigated whether changes in magnetotelluric phase tensors over time were due to changes in the subsurface or due to measurement errors
Performed geophysical field work in the Taupo Volcanic Zone

Assistant Researcher

Compared measured P and PcP arrivals from earthquake events in South America with modeled arrival times to investigate D” layer anisotropy in the quasi-southern hemisphere
Created internal document to facilitate continuation of the project

Research Intern

Quantified the macroscopic surface texture of Enceladus' south polar region using intensity scans measured by the Cassini spacecraft
Leveraged results to infer the physical composition of expelled plume material and the geologic evolution of this moon

Chang, Jason P., Sjoerd AL de Ridder, and Biondo L. Biondi. "High-frequency Rayleigh-wave tomography using traffic noise from Long Beach, California." Geophysics 81.2 (2016): B43-B53.
Nakata, Nori, Jason P. Chang, Jesse F. Lawrence, and Pierre Boué. "Body wave extraction and tomography at Long Beach, California, with ambient‐noise interferometry." Journal of Geophysical Research: Solid Earth 120.2 (2015): 1159-1173.

Chang, Jason P., "Multicomponent ambient noise crosscorrelation at Forties." SEG Technical Program Expanded Abstracts 2016. Society of Exploration Geophysicists, 2016. 2709-2714. (Oral Presentation)
Chang, Jason P., and Biondo Biondi. "Rayleigh-wave tomography using traffic noise at Long Beach, CA." SEG Technical Program Expanded Abstracts 2015. Society of Exploration Geophysicists, 2015. 2424-2429. (Oral Presentation)
Chang, Jason P., and Rosemary J. Knight. "Resolving Lithological Units in the Vadose Zone from Temporal Changes in Electrical Conductivity." AGU Fall Meeting Abstracts, 2014. (Poster Presentation)
Chang, Jason P., Sjoerd de Ridder, and Biondo Biondi. "Power spectral densities and ambient noise cross-correlations at Long Beach." SEG Technical Program Expanded Abstracts 2013. Society of Exploration Geophysicists, 2013. 2196-2200. (Oral Presentation)

Teaching Assistant