Chukwuebuka C Nweke

Chukwuebuka C Nweke
University of Southern California | USC · Department of Civil and Environmental Engineering

B.S, M.S, Ph.D

About

15
Publications
6,375
Reads
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133
Citations
Introduction
Dr. Chukwuebuka C. Nweke is an Assistant Professor in the Sonny Astani Department of Civil and Environmental Engineering. Dr. Nweke's research is in seismic hazard modeling related to site specific ground motion effects in sedimentary basins. This involves developing a growing relational database for earthquake ground motion intensity measures and metadata, and employing components of data analytics. He also investigates the dynamic mechanical behavior of bio-cemented soils.
Additional affiliations
August 2021 - present
University of Southern California
Position
  • Professor (Assistant)
Description
  • Dr. Chukwuebuka C. Nweke is an Assistant Professor in the Sonny Astani Department of Civil and Environmental Engineering. Dr. Nweke's research is in seismic hazard modeling related to site specific ground motion effects in sedimentary basins. This involves developing a growing relational database for earthquake ground motion intensity measures and metadata, and employing components of data analytics. He also investigates the dynamic mechanical behavior of bio-cemented soils.
August 2020 - April 2021
ENGEO Incorpoprated
Position
  • Engineer
Description
  • Serve as a staff engineer in the consulting firm helping with projects pertaining to seismic hazard assessment (non-ergodic analysis, site-specific hazard analysis), and geotechnical engineering designs (retaining walls, building retrofits, new developments)
October 2017 - July 2020
University of California, Los Angeles
Position
  • PostDoc Position
Description
  • I focused on research aiming to quantify basin effects in earthquake ground motion using empirical observations in southern California. This involved developing a region specific basin amplification model to be used as part of an updated site amplification model within the ground motion prediction equations. I was also task with the validation of physics-based earthquake simulations as related to basin effects.
Education
August 2013 - December 2017
University of California, Berkeley
Field of study
  • Civil and Environmental Engineering (Geotechnical)
August 2012 - May 2013
University of California, Berkeley
Field of study
  • Civil and Environmental Engineering (Geotechnical)
September 2007 - March 2012
University of California, Davis
Field of study
  • Civil and Environmental Engineering

Publications

Publications (15)
Article
Ergodic site amplification models for active tectonic regions are conditioned on the time-averaged shear wave velocity in the upper 30 m ( V S 30 ) and the depth to a shear wave velocity isosurface ( z x ). The depth components of such models are derived using data from sites within many geomorphic domains. We provide a site amplification model uti...
Article
We introduce procedures to validate site response in sedimentary basins as predicted using ground motion simulations. These procedures aim to isolate contributions of site response to computed intensity measures relative to those from seismic source and path effects. In one of the validation procedures, simulated motions are analyzed in the same ma...
Article
Full-text available
Systematically collected and curated data sets from historical events provide a strong basis for simulating the physical and functional effects of natural hazards on the built environment. This article develops a relational database to support post-earthquake damage and recovery modeling of building portfolios. The current version of the database h...
Article
Full-text available
Coseismic surface fault displacement presents a serious potential hazard for structures and for lifeline infrastructure. Distributed lifeline infrastructure tends to cover large distances and may cross faults in multiple locations, especially in active tectonic regions like California. However, fault displacement measurements for engineering applic...
Article
The adoption of mechanistic-empirical approach to pavement design requires the use of resilient modulus of subgrade soils as a crucial input. The determination of in the laboratory is inexpedient due to the nature of the existing test protocols. This prompted the use of estimated values, which inadvertently has gained popularity lately. However, th...
Technical Report
Seismic site response can be influenced by a variety of physical mechanisms that include amplification due to resonance, nonlinearity, topographic effects, impedance contrasts, and contributions from two- or three-dimensional wave propagation in sedimentary basins. Current ground motion models use ergodic procedures that average these effects over...
Article
The 2019 Ridgecrest earthquake sequence produced a 4 July M 6.5 foreshock and a 5 July M 7.1 mainshock, along with 23 events with magnitudes greater than 4.5 in the 24 hr period following the mainshock. The epicenters of the two principal events were located in the Indian Wells Valley, northwest of Searles Valley near the towns of Ridgecrest, Trona...
Article
We present a database and analyze ground motions recorded during three events that occurred as part of the July 2019 Ridgecrest earthquake sequence: a moment magnitude (M) 6.5 foreshock on a left-lateral cross fault in the Salt Wells Valley fault zone, an M 5.5 foreshock in the Paxton Ranch fault zone, and the M 7.1 mainshock, also occurring in the...
Article
Following the Ridgecrest earthquake sequence, consisting of an M 6.4 foreshock and M 7.1 mainshock along with many other events, the Geotechnical Extreme Events Reconnaissance association deployed a team to gather perishable data. The team focused their efforts on documenting ground deformations including surface fault rupture south of the Naval Ai...
Article
Full-text available
The ability to rapidly assess the spatial distribution and severity of building damage is essential to post-event emergency response and recovery. Visually identifying and classifying individual building damage requires significant time and personnel resources and can last for months after the event. This paper evaluates the feasibility of using ma...
Technical Report
Full-text available
The Ridgecrest Earthquake sequence included a foreshock event on July 4 2019 (M6.4) and a M7.1 mainshock event on July 5 2019. These events occurred in the Eastern California Shear Zone, near Indian Wells Valley, south of China Lake and west of Searles Valley. GEER has partnered with several organizations to collect perishable data and document the...
Conference Paper
We investigate benefits of regionalizing basin response in ergodic ground motion models. Using southern California data, we find average responses between basin structures, even when the primary site variables used in ground motion models (VS30 and depth parameters) are controlled for. For example, the average site response in relatively modestly s...
Conference Paper
The establishment of the bio-inspired and bio-mediated sub-disciplines in the emerging field of biogeotechnology has led to the developments of many innovative methods and techniques. These methods and techniques potentially provide sustainable alternatives to conventional approaches that may be less desirable due to their use of high-embodied ener...
Conference Paper
Over the past decade, recent developments between the geotechnical and life science disciplines have establish microbial induced calcite precipitation (MICP) as a novel ground improvement method. This method improves the static and dynamic mechanical properties of the soil while maintaining its environmentally friendly characteristics. Its applicat...

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Projects

Projects (2)
Project
The proposed project seeks to evaluate amplification in Southern California basins to develop non-ergodic amplification factors, thereby reducing bias and uncertainty in seismic hazard evaluation.