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Journal Article

Role of poroelasticity during the early postseismic deformation of the 2010 Maule megathrust earthquake

Authors
/persons/resource/carlosp

Pena Hormazabal,  Carlos Raul
2.6 Seismic Hazard and Risk Dynamics, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/metzger

Metzger,  Sabrina
4.1 Lithosphere Dynamics, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/heidbach

Heidbach,  O.
2.6 Seismic Hazard and Risk Dynamics, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/jbed

Bedford,  Jonathan
4.1 Lithosphere Dynamics, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Bookhagen,  Bodo
External Organizations;

/persons/resource/marcos

Moreno,  M.
4.1 Lithosphere Dynamics, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/oncken

Oncken,  O.
4.1 Lithosphere Dynamics, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/fcotton

Cotton,  Fabrice
2.6 Seismic Hazard and Risk Dynamics, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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5011177.pdf
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Citation

Pena Hormazabal, C. R., Metzger, S., Heidbach, O., Bedford, J., Bookhagen, B., Moreno, M., Oncken, O., Cotton, F. (2022): Role of poroelasticity during the early postseismic deformation of the 2010 Maule megathrust earthquake. - Geophysical Research Letters, 49, 9, e2022GL098144.
https://doi.org/10.1029/2022GL098144


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5011177
Abstract
Megathrust earthquakes impose changes of differential stress and pore pressure in the lithosphere-asthenosphere system that are transiently relaxed during the postseismic period primarily due to afterslip, viscoelastic and poroelastic processes. Especially during the early postseismic phase, however, the relative contribution of these processes to the observed surface deformation is unclear. To investigate this, we use geodetic data collected in the first 48 days following the 2010 Maule earthquake and a poro-viscoelastic forward model combined with an afterslip inversion. This model approach fits the geodetic data 14% better than a pure elastic model. Particularly near the region of maximum coseismic slip, the predicted surface poroelastic uplift pattern explains well the observations. If poroelasticity is neglected, the spatial afterslip distribution is locally altered by up to ±40%. Moreover, we find that shallow crustal aftershocks mostly occur in regions of increased postseismic pore-pressure changes, indicating that both processes might be mechanically coupled.