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Source time function clustering reveals patterns in earthquake dynamics

Yin, Jiuxun and Li, Zefeng and Denolle, Marine (2020) Source time function clustering reveals patterns in earthquake dynamics. . (Unpublished)

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We cluster a global data base of 3529 M > 5.5 earthquakes in 1995-2018 based on a dynamic time warping dissimilarity of their source time functions (STFs). The clustering exhibits different degrees of STF shape complexity and suggests an association between STF complexity and earthquake source parameters. Thrust events are in large proportion with simple STF shapes and at all depths. In contrast, earthquakes with complex STF shapes tend to be located at shallow depth in complicated tectonic regions with preferentially strike slip mechanism and relatively longer duration. With 2D dynamic modeling of earthquake ruptures on heterogeneous pre-stress and linear slip-weakening friction, we find a systematic variation of the simulated STF complexity with frictional properties. Comparison between the observed and synthetic clustering distributions provides useful constraints on elements of the frictional properties. In particular, the characteristic slip-weakening distance could be constrained to be generally short (< 0.1 m) and depth dependent.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
http://scardec.projects.sismo.ipgp.frRelated ItemSCARDEC source time function database ItemSBIEMLAB code ItemMatlab scripts
http://gmt.soest.hawaii.eduRelated ItemGlobal maps
Yin, Jiuxun0000-0003-0641-5680
Li, Zefeng0000-0003-4405-8872
Denolle, Marine0000-0002-1610-2250
Additional Information:License: Attribution-NonCommercial 4.0 International. Published Online: Fri, 3 Jul 2020. We sincerely thank Martin Vallée for his insightful suggestions. All the source time functions are downloaded from SCARDEC source time function database ( The dynamic rupture simulation code SBIEMLAB is developed by Jean-Paul Ampuero (available on The Matlab scripts to reproduce the results and figures can be obtained on the Github ( Global maps are made by GMT (Wessel et al., 2013, available at
Group:Seismological Laboratory
Record Number:CaltechAUTHORS:20201027-072217613
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106285
Deposited By: Tony Diaz
Deposited On:27 Oct 2020 16:56
Last Modified:16 Nov 2021 18:52

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