Ma, Bo (2023) Geological controls on megathrust slip: the 2014 Pisagua, Chile, earthquake sequence as a natural laboratory. (PhD/ Doctoral thesis), Christian-Albrechts-Universität, Kiel, Germany, XI, 194 pp.

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Abstract

Most subduction zones remain poorly resolved when it comes to the study of the precise
location of the far offshore located updip limit of coseismic slip and its controlling param-
eters, which is an essential component of earthquake hazard assessment. The relative lack
of seismicity on the updip limit, combined with laboratory friction studies, suggest the
shallow fault is mostly velocity strengthening and likely to creep. This view is reinforced
by geodetic inversions, which show low to zero coupling close to the trench. However, these
locations are remote from the land; hence the models derived from terrestrial stations are
not sufficiently well constrained. Moreover, the updip region can also be seismogenic, as
demonstrated by tsunami earthquakes and shallow, slow slip events. (...)

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