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Extending Earthquakes' Reach Through Cascading.

Abstract : Earthquakes, whatever their size, can trigger other earthquakes. Mainshocks cause aftershocks to occur, which in turn activate their own local aftershock sequences, resulting in a cascade of triggering that extends the reach of the initial mainshock. A long-lasting difficulty is to determine which earthquakes are connected, either directly or indirectly. Here we show that this causal structure can be found probabilistically, with no a priori model nor parameterization. Large regional earthquakes are found to have a short direct influence in comparison to the overall aftershock sequence duration. Relative to these large mainshocks, small earthquakes collectively have a greater effect on triggering. Hence, cascade triggering is a key component in earthquake interactions.
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https://hal-insu.archives-ouvertes.fr/insu-00334983
Contributor : Pascale Talour <>
Submitted on : Tuesday, October 28, 2008 - 11:06:00 AM
Last modification on : Wednesday, October 14, 2020 - 4:01:59 AM

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David Marsan, O. Lengline. Extending Earthquakes' Reach Through Cascading.. Science, American Association for the Advancement of Science, 2008, 319 (5866), pp.1076 à 1079. ⟨10.1126/science.1148783⟩. ⟨insu-00334983⟩

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