TY - GEN
T1 - Earthquake source parameters for Chilean events for use in the NGA-subduction project
AU - Contreras, V.
AU - Stewart, J. P.
AU - Kishida, T.
AU - Darragh, R. B.
AU - Youngs, R. R.
N1 - Funding Information:
NGA-Sub research project was supported by FM Global, USGS, California Department of Transportation, and Pacific Gas & Electric Company. These supports are gratefully acknowledged. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect those of the sponsoring agencies.
Publisher Copyright:
Copyright © NCEE 2018: Integrating Science, Engineering, and Policy.All rights reserved.
PY - 2018
Y1 - 2018
N2 - The NGA-Subduction project is currently under development, focusing on analyzing the collected data for different regions affected by subduction-zone earthquakes around the world. As part of this effort, an earthquake-source database has been developed for events with ground motion recordings obtained in Chilean territory. Data from the South American subduction zone, and particularly from Chilean earthquakes, are critical for the success of this project, due to the availability of data from many large (M > 7.5) interface subduction events and the importance of significant regional path effects previously observed in Chile but not evident elsewhere. The source database contains information on seismic moment, moment magnitude, hypocenter location, nodal planes, and fine-fault geometric parameters. More than 40 different finite-fault models have been collected and evaluated, introducing a uniform and consistent procedure for fault trimming, where only the trimmed portion of the fault plane with significant slip is used for source-to-site distance calculations. For events that lack published finite-fault models, uniform protocols are applied to assign the source parameters and a simulation-based representation of the finite-fault parameters is used for distance calculation. To support the use of these simulations for subduction-zone earthquakes, relationships for M-rupture area, M-aspect ratio, and hypocenter locations in the down-dip and along-strike directions are developed.
AB - The NGA-Subduction project is currently under development, focusing on analyzing the collected data for different regions affected by subduction-zone earthquakes around the world. As part of this effort, an earthquake-source database has been developed for events with ground motion recordings obtained in Chilean territory. Data from the South American subduction zone, and particularly from Chilean earthquakes, are critical for the success of this project, due to the availability of data from many large (M > 7.5) interface subduction events and the importance of significant regional path effects previously observed in Chile but not evident elsewhere. The source database contains information on seismic moment, moment magnitude, hypocenter location, nodal planes, and fine-fault geometric parameters. More than 40 different finite-fault models have been collected and evaluated, introducing a uniform and consistent procedure for fault trimming, where only the trimmed portion of the fault plane with significant slip is used for source-to-site distance calculations. For events that lack published finite-fault models, uniform protocols are applied to assign the source parameters and a simulation-based representation of the finite-fault parameters is used for distance calculation. To support the use of these simulations for subduction-zone earthquakes, relationships for M-rupture area, M-aspect ratio, and hypocenter locations in the down-dip and along-strike directions are developed.
UR - http://www.scopus.com/inward/record.url?scp=85085528954&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85085528954
T3 - 11th National Conference on Earthquake Engineering 2018, NCEE 2018: Integrating Science, Engineering, and Policy
SP - 5466
EP - 5471
BT - 11th National Conference on Earthquake Engineering 2018, NCEE 2018
PB - Earthquake Engineering Research Institute
T2 - 11th National Conference on Earthquake Engineering 2018: Integrating Science, Engineering, and Policy, NCEE 2018
Y2 - 25 June 2018 through 29 June 2018
ER -