A Transient in Surface Motions Dominated by Deep Afterslip Subsequent to a Shallow Supershear Earthquake: The 2018 Mw7.5 Palu Case
Year: 2021
Type: article
Abstract: The 2018 Palu earthquake is a remarkable strike‐slip event due to its nature as a shallow supershear fault rupture across several segments and a destructive tsunami that followed coseismic deformation. GPS offsets in the wake of the 2018 earthquake display a transient in the surface motions of northwest Sulawesi. A Bayesian approach identifies (predominantly aseismic) deep afterslip on and below the coseismic rupture plane as the dominant physical mechanism causing the cumulative, postseismic, surface displacements whereas viscous relaxation of the lower crust and poro‐elastic rebound contribute negligibly. We confirm a correlation between shallow supershear rupture and postseismic surface transients with afterslip activity in the zone below an interseismically locked fault plane where the slip rate tapers from zero to creeping.
DOI: 10.1029/2020gc009491
Language: English
Subfield: Geophysics
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,500
Awards: Multi-disciplinary Approach Towards a Better Understanding of the Seismic Cycle using Two Decades of Space Geodetic Data in Sulawesi SE Asia (MUST2SEA), Regions of HIgh SeismiC Hazard: IdentfcatIon of Fault Deformation Transients in the Neotectonic Framework of Central and North Sulawesi, Indonesia (RISC2IDNSI)
OpenAlex ID: W3134922720