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Using centroid time-delays to characterize source durations and identify earthquakes with unique characteristics

Duputel, Zacharie and Tsai, Victor C. and Rivera, Luis and Kanamori, Hiroo (2013) Using centroid time-delays to characterize source durations and identify earthquakes with unique characteristics. Earth and Planetary Science Letters, 374 . pp. 92-100. ISSN 0012-821X. doi:10.1016/j.epsl.2013.05.024.

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The relationship between M_0 and the rupture duration is often difficult to establish. This is particularly true for large earthquakes for which the moment rate functions (MRF) generally have complicated shapes, and the estimated durations can vary considerably depending on the methodology used to evaluate the MRF. In this work, we show that the centroid time-delay (τ_c) provides an alternative estimate of the source duration. Inverted MRFs often end gradually, making the end of coseismic rupture difficult to detect. In such cases, when the rupture duration is not well defined, the time-delay τ_c is a useful quantity to represent the first-order temporal characteristics of the rupture process. Variations in stress parameter Δσ can be investigated by assuming a standard scaling relationship between the seismic moment M0M0 and τ_c .This simple scaling relationship can also be used to identify unusual earthquakes, with unique source properties, such as events involving complicated rupture processes or earthquakes characterized by unusual rupture velocities, stress drops or aspect ratios.

Item Type:Article
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URLURL TypeDescription DOIArticle
Tsai, Victor C.0000-0003-1809-6672
Rivera, Luis0000-0002-0726-5445
Kanamori, Hiroo0000-0001-8219-9428
Additional Information:© 2013 Elsevier B.V. Received 19 March 2013; Received in revised form 13 May 2013; Accepted 14 May 2013; Editor: P. Shearer. Available online 13 June 2013. We thank Zhongwen Zhan, Gavin Hayes, Göran Ekström and an anonymous reviewer for their helpful suggestions. This work uses Federation of Digital Seismic Networks (FDSN) seismic data, CMT solutions from the Global CMT catalog and event origin times from the USGS PDE catalog. The Incorporated Research Institutions for Seismology (IRIS) Data Management System (DMS) was used to access the data. This work made use of the Matplotlib python library created by John D. Hunter.
Group:Seismological Laboratory
Subject Keywords:rupture duration; tsunami earthquakes; transform fault; scaling laws; earthquake source observations; seismicity and tectonics
Record Number:CaltechAUTHORS:20131017-080058538
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Official Citation:Zacharie Duputel, Victor C. Tsai, Luis Rivera, Hiroo Kanamori, Using centroid time-delays to characterize source durations and identify earthquakes with unique characteristics, Earth and Planetary Science Letters, Volume 374, 15 July 2013, Pages 92-100, ISSN 0012-821X, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41960
Deposited By: Tony Diaz
Deposited On:17 Oct 2013 21:01
Last Modified:10 Nov 2021 04:36

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