Abstract
<p> To constrain the poroelastic component of postseismic deformation, we model the subsurface hydrologic response to the <em> M </em> <em> w </em> 7.6 subduction zone earthquake that occurred on the plate interface beneath the Nicoya peninsula in Costa Rica on 5 September 2012. The model shows that poroelastic relaxation occurs on multiple time scales and the associated deformation can be up to 2 cm for the trench‐perpendicular component. By modeling the <em> time‐dependent </em> deformation associated with poroelastic relaxation, we can begin to remove its contribution from the observed geodetic signal. Inversions for after slip that ignore poroelastic deformation have errors of 10–20% overall and up to 50% locally. Poroelastic effects can both mute and amplify the inferred afterslip.</p>
Original language | American English |
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Journal | Geophysical Research Letters |
Volume | 47 |
DOIs | |
State | Published - Apr 1 2020 |
Keywords
- postseismic deformation
- poroelastic deformation
- Costa Rica earthquake
- groundwater
- Nicoya penninsula
Disciplines
- Earth Sciences