Aftershocks of the 2012 Off-Coast of Sumatra Earthquake Sequence

Chai, Chengping; Ammon, Charles J.; Cleveland, Kenneth Michael

doi:10.1016/j.tecto.2019.04.028

Title: Aftershocks of the 2012 Off-Coast of Sumatra Earthquake Sequence

Journal Article · Fri May 10 00:00:00 EDT 2019 · Tectonophysics

DOI:https://doi.org/10.1016/j.tecto.2019.04.028· OSTI ID:1514982

^[1]; Ammon, Charles J. ^[1];

^[2]

The Pennsylvania State Univ., University Park, PA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Aftershocks of the 2012 Off-Coast of Sumatra Earthquake Sequence exhibit a complex and diffuse spatial distribution. The first-order complexity in aftershock distribution is clear and well beyond the influence of typical earthquake location uncertainty. The sequence included rupture of multiple fault segments, spatially separated. We use surface-wave based relative centroid locations to examine whether, at the small scale, the distribution of the aftershocks was influenced by location errors. Surface-wave based relative location has delineated precise oceanic transform fault earthquake locations in multiple regions. However, the relocated aftershocks off the coast of Sumatra seldom align along simple linear trends that are compatible with the corresponding fault strikes as estimated for the GCMT catalog. The relocation of roughly 60 moderate-earthquake epicentroids suggests that the faulting involved in the 2012 earthquake aftershock sequence included strain release along many short fault segments. Statistical analysis and temporal variations of aftershocks show a typical decay of the aftershocks but a relatively low number of aftershocks, as is common for intraplate oceanic earthquakes. Coulomb stress calculations indicate that most of the moderate-magnitude aftershocks are compatible with stress changes predicted by the large-event slip models. Furthermore the patterns in the aftershocks suggest that the formation of the boundary and eventual localization of deformation between the Indian and Australian plate is a complicated process.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: 89233218CNA000001; AC05-00OR22725

OSTI ID:: 1514982

Alternate ID(s):: OSTI ID: 1513402; OSTI ID: 1547204

Report Number(s):: LA-UR-18-28672

Journal Information:: Tectonophysics, Vol. 763, Issue C; ISSN 0040-1951

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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Title: Aftershocks of the 2012 Off-Coast of Sumatra Earthquake Sequence

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