142709 - Migratory earthquake precursors are dominant on an ice stream fault.pdf (2.53 MB)
Migratory earthquake precursors are dominant on an ice stream fault
journal contribution
posted on 2023-05-20, 20:45 authored by Barcheck, G, Brodsky, EE, Fulton, PM, Matt KingMatt King, Siegfried, MR, Tulaczyk, SSimple fault models predict earthquake nucleation near the eventual hypocenter (self-nucleation). However, some earthquakes have migratory foreshocks and possibly slow slip that travel large distances toward the eventual mainshock hypocenter (migratory nucleation). Scarce observations of migratory nucleation may result from real differences between faults or merely observational limitations. We use Global Positioning System and passive seismic records of the easily observed daily ice stream earthquake cycle of the Whillans Ice Plain, West Antarctica, to quantify the prevalence of migratory versus self-nucleation in a large-scale, natural stick-slip system. We find abundant and predominantly migratory precursory slip, whereas self-nucleation is nearly absent. This demonstration that migratory nucleation exists on a natural fault implies that more-observable migratory precursors may also occur before some earthquakes.
History
Publication title
Science AdvancesVolume
7Issue
6Article number
eabd0105Number
eabd0105Pagination
1-8ISSN
2375-2548Department/School
School of Geography, Planning and Spatial SciencesPublisher
American Association for the Advancement of SciencePlace of publication
United StatesRights statement
Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S.Government works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC)Repository Status
- Open