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Reply to ‘Comment on “Evidence for a large strike-slip component during the 1960 Chilean earthquake” by H. Kanamori, L. Rivera and S. Lambotte’ by J. C. Savage

Kanamori, Hiroo and Rivera, Luis and Lambotte, Sophie (2022) Reply to ‘Comment on “Evidence for a large strike-slip component during the 1960 Chilean earthquake” by H. Kanamori, L. Rivera and S. Lambotte’ by J. C. Savage. Geophysical Journal International, 228 (2). pp. 1184-1190. ISSN 0956-540X. doi:10.1093/gji/ggab365.

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We thank Dr Jim Savage for his interest in, and comment on, our paper (Kanamori et al. 2019, hereafter referred to as KRL19), where we showed that the commonly believed thrust-fault mechanism of the 1960 Chilean earthquake (Mw = 9.5) is not compatible with teleseismic data (e.g. strain seismograms at Isabella, California, and Ogdensburg, New Jersey, and long-period seismograms at Pasadena, California and Berkely, California) and suggested that dextral-slip component comparable in amount to the dip-slip component is required. We did not test our model against the shear strain data in Chile published in Plafker & Savage (1970). Savage (2021, hereafter referred to as S21) investigated whether the large dextral slip is compatible with the observed shear strain data. He concluded that the observed shear strain was very small, and provides no obvious evidence for large dextral component. However, he also stated that the absence of shear strain is not conclusive evidence of the absence of dextral slip. In fact, using a 2-D model, he showed in his fig. 9 that models with strike-slip moment comparable to the thrust moment can fit the observed uplift and strain data well. However, he noted that these models require remarkable balancing of contributions from the shallower (depths <∼70 km) and deeper strike-slip components. Savage thinks that such near-perfect cancelling is unlikely. Also, the distribution of the dextral slip shown in fig. 9 may appear somewhat unrealistic because it is very different from that of dip slip.

Item Type:Article
Related URLs:
URLURL TypeDescription et al. 2019
Kanamori, Hiroo0000-0001-8219-9428
Rivera, Luis0000-0002-0726-5445
Additional Information:© The Author(s) 2021. Published by Oxford University Press on behalf of The Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2021 September 7in original form 2021 August 9. We thank Jim Savage for sending us an early version of his manuscript, which allowed us to understand the nature of the strain data used for establishing the slip model of the 1960 Chilean earthquake. His comments are insightful and useful for finding a range of acceptable slip models. The Data Management System of the Incorporated Research Institutions for Seismology ( was used to access the seismic data from the Global Seismic Network stations. We thank Editor Carl Tape for constructive comments.
Group:Seismological Laboratory
Subject Keywords:Geomechanics; Earthquake dynamics; Earthquake source observations; Dynamics and mechanics of faulting; Subduction zone processes
Issue or Number:2
Record Number:CaltechAUTHORS:20220120-890618000
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Official Citation:Hiroo Kanamori, Luis Rivera, Sophie Lambotte, Reply to ‘Comment on “Evidence for a large strike-slip component during the 1960 Chilean earthquake” by H. Kanamori, L. Rivera and S. Lambotte’ by J. C. Savage, Geophysical Journal International, Volume 228, Issue 2, February 2022, Pages 1184–1190,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:113030
Deposited By: George Porter
Deposited On:20 Jan 2022 22:40
Last Modified:20 Jan 2022 22:40

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