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Ground-motion evaluation of moderate and large interface earthquakes along the Chilean subduction zone

Carlos Herrera, John F. Cassidy, Stan E. Dosso, Nicolas Bastias and Tuna Onur
Ground-motion evaluation of moderate and large interface earthquakes along the Chilean subduction zone
Bulletin of the Seismological Society of America (September 2020) 110 (6): 2693-2710

Abstract

Strong-motion observations of recent interface earthquakes along the Chilean subduction zone are evaluated with two ground-motion models (GMM). One GMM was developed with Chilean data and the other with global data. The GMM developed with local Chilean data is found to have an overall better prediction performance than the GMM developed using a global data set. Using residual analysis with the Chilean GMM as reference model due to its better performance, clear indications of an increase of short-period radiation for deeper earthquakes in north and central Chile were found, which may be related to frictional features on the interface such as interseismic coupling, as found previously for other regions, such as Japan. Also, the Iquique earthquake, which featured a clear precursory slow-slip event, exhibits mostly negative between-event residuals at short periods for earthquakes before and after the mainshock, indicating predominantly weaker short-period radiation. However, this trend is not observed in the aftershock sequence of the Illapel earthquake, which did not feature a significant slow-slip event nor precursory seismicity in its rupture area. Finally, a poor predictive performance was found for the Chilean GMM in southern Chile, overpredicting most of the observations. Based on these results, it is proposed that future local GMMs should include corrections for depth, regional effects and include earthquakes from southern Chile, as new data are becoming available in this region.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 110
Serial Issue: 6
Title: Ground-motion evaluation of moderate and large interface earthquakes along the Chilean subduction zone
Affiliation: University of Victoria, School of Earth and Ocean Sciences, Victoria, BC, Canada
Pages: 2693-2710
Published: 20200901
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 52
Accession Number: 2020-079486
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps
S46°00'00" - S40°00'00", W76°00'00" - W70°00'00"
Secondary Affiliation: Genesis Ingenieria, CHL, ChileOnur Seemann Consulting, CAN, Canada
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202048
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