Earthquake source parameters for Chilean events for use in the NGA-subduction project

V. Contreras, J. P. Stewart, T. Kishida, R. B. Darragh, R. R. Youngs

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

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.

Original languageBritish English
Title of host publication11th National Conference on Earthquake Engineering 2018, NCEE 2018
Subtitle of host publicationIntegrating Science, Engineering, and Policy
PublisherEarthquake Engineering Research Institute
Pages5466-5471
Number of pages6
ISBN (Electronic)9781510873254
StatePublished - 2018
Event11th National Conference on Earthquake Engineering 2018: Integrating Science, Engineering, and Policy, NCEE 2018 - Los Angeles, United States
Duration: 25 Jun 201829 Jun 2018

Publication series

Name11th National Conference on Earthquake Engineering 2018, NCEE 2018: Integrating Science, Engineering, and Policy
Volume9

Conference

Conference11th National Conference on Earthquake Engineering 2018: Integrating Science, Engineering, and Policy, NCEE 2018
Country/TerritoryUnited States
CityLos Angeles
Period25/06/1829/06/18

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