Premium
Comparing source inversion techniques for GPS‐based local tsunami forecasting: A case study for the April 2014 M 8.1 Iquique, Chile, earthquake
Author(s) -
Chen Kejie,
Babeyko Andrey,
Hoechner Andreas,
Ge Maorong
Publication year - 2016
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl068042
Subject(s) - global positioning system , inversion (geology) , seismology , moment tensor , warning system , centroid , geology , geodesy , computer science , slip (aerodynamics) , artificial intelligence , telecommunications , engineering , aerospace engineering , oceanography , deformation (meteorology) , tectonics
Real‐time GPS is nowadays considered as a valuable component of next generation near‐field tsunami early warning systems able to provide fast and reliable source parameters. Looking for optimal methodologies and assessing corresponding uncertainties becomes an important task. We take the opportunity and consider the 2014 Pisagua event as a case study to explore tsunami forecast uncertainty related to the GPS‐based source inversion. We intentionally neglect all other sources of uncertainty (observation set, signal processing, wave simulation, etc.) and exclusively assess the effect of inversion technique. In particular, we compare three end‐member methods: (1) point‐source fastCMT (centroid moment tensor), (2) distributed slip along predefined plate interface, and (3) unconstrained inversion into a single uniform slip finite fault. The three methods provide significantly different far‐field tsunami forecast but show surprisingly similar tsunami predictions in the near field.