Figure 6
From: Coral geochemical response to uplift in the aftermath of the 2005 Nias–Simeulue earthquake
Coral reef submergence and expansion in northwest Nias prior to megathrust earthquakes. (a) Location of coral drill-site 2.5A (this study) and Porites microatoll records AFL, PWG and MZL (Ref.25) that document interseismic subsidence prior to the 1861 and 2005 earthquakes. (b) 23 May 2009 image of Porites corals at the 2.5A uplift site that colonized new seafloor created by crustal subsidence before the 2005 earthquake. Foreground shows regrowth atop a dead Porites colony as it resubmerged during the decades leading-in to the 2005 earthquake. (c) Summary of subsidence rates recorded by microatolls AFL, PWG and MZL25. AFL and PWG recorded increased subsidence during the decades immediately before the 1861 earthquake, promoting reef expansion. Map image is for April 2023 on Google Earth Pro 7.3.9345 (2022 version) at http://www.google.com/earth/index.html (accessed June 15, 2023).
