A 15 year slow-slip event on the Sunda megathrust offshore Sumatra

TitleA 15 year slow-slip event on the Sunda megathrust offshore Sumatra
Publication TypeJournal Article
Year of Publication2015
AuthorsTsang LLH, Meltzner AJ, Philibosian B, Hill EM, Freymueller JT, Sieh KE
JournalGeophysical Research Letters
Volume42
Issue16
Pagination6630-6638
Date Published08/2015
Abstract

In the Banyak Islands of Sumatra, coral microatoll records reveal a 15 year-long reversal of interseismic vertical displacement from subsidence to uplift between 1966 and 1981. To explain these coral observations, we test four hypotheses, including regional sea level changes and various tectonic mechanisms. Our results show that the coral observations likely reflect a 15 year-long slow-slip event (SSE) on the Sunda megathrust. This long-duration SSE exceeds the duration of previously reported SSEs and demonstrates the importance of multidecade geodetic records in illuminating the full spectrum of megathrust slip behavior at subduction zones.

DOI10.1002/2015gl064928