Update of NGA-East Database to Include Central and Eastern North America Events Since November 2011
Description:
The NGA-East database was developed as part of a Senior Seismic Hazard Analysis Committee process during the NGA-East Project (Goulet et al. 2021[1]). That database includes data and metadata from events up to November 2011 and was used in the development of ground motion models and site amplification models applicable to stable continental regions. The coverage of seismic instrumentation in the central and eastern portions of North America has increased in recent years and the quality of instruments now provide data over a broader useable frequency range. To leverage this improved information for ground-motion research, while maintaining data quality protocols typical of NGA projects, we have expanded the NGA-East database to include the recent data. Due to the uncertainty of potentially-induced-events in Oklahoma, the data for this region was obtained from Li et al. 2023[2]. This effort has three major components: (1) data processing; (2) consistent metadata compilation; and (3) organization of the data into a relational database. To facilitate efficient data processing while maintaining protocols for human inspection of waveforms to ensure reliability, we worked with collaborators to expand the capabilities of the United States Geological Survey’s automated processing code gmprocess (Thompson et al. 2023[3]) to include displacement drift checks in the selection of high-pass corner frequencies. The metadata for newly added events includes moment magnitudes from moment tensor solutions for 76 of 100 events, and estimates provided with uncertainties for the remaining 24 events. Rupture distances are computed from simulated finite faults following standard NGA procedures. Site parameters are derived from VS profiles where available and the Parker et al. (2017)[4] geology-slope proxy otherwise. The data is archived in a relational database that connects 25 tables of data, metadata and intensity measures. Relative to the original NGA-East database, the dataset grew 72% in the number of recordings, with a significant increase (from 4400 to 10200) in usable records at low periods.
Session: USGS National Seismic Hazard Models: 2023 and Beyond
Type: Oral
Date: 4/18/2023
Presentation Time: 10:45 AM (local time)
Presenting Author: Maria E. Ramos-Sepulveda
Student Presenter: Yes
Invited Presentation:
Authors
Maria Ramos-Sepulveda Presenting Author Corresponding Author mariaramos1@g.ucla.edu University of California, Los Angeles |
Grace Parker gparker@usgs.gov U.S. Geological Survey |
Tristan Buckreis tristanbuckreis@ucla.edu University of California, Los Angeles |
Scott Brandenberg sjbrandenberg@g.ucla.edu University of California, Los Angeles |
Eric Thompson emthompson@usgs.gov U.S. Geological Survey |
Meibai Li mli@utexas.edu University of Texas at Austin |
Okan Ilhan okan.ilhan.uiuc@gmail.com Ankara Yildirim Beyazit University |
Ellen Rathje e.rathje@mail.utexas.edu University of Texas at Austin |
Youssef Hashash hashash@illinois.edu University of Illinois Urbana-Champaign |
Jonathan P Stewart jstewart@seas.ucla.edu University of California, Los Angeles, Los Angeles, California, United States |
Update of NGA-East Database to Include Central and Eastern North America Events Since November 2011
Category
USGS National Seismic Hazard Models: 2023 and Beyond