Modeling the Contribution of Poroelastic Deformation to Postseismic Geodetic Signals

Kimberly McCormack; Marc A. Hesse; Timothy H. Dixon; Rocco Malservisi

doi:10.1029/2020GL086945

Modeling the Contribution of Poroelastic Deformation to Postseismic Geodetic Signals

Kimberly McCormack, Marc A. Hesse, Timothy H. Dixon, Rocco Malservisi

School of Geosciences

Research output: Contribution to journal › Article › peer-review

Abstract

To constrain the poroelastic component of postseismic deformation, we model the subsurface hydrologic response to the M w 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&hyphen;perpendicular component. By modeling the time&hyphen;dependent 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.

Original language	American English
Journal	Geophysical Research Letters
Volume	47
DOIs	https://doi.org/10.1029/2020GL086945
State	Published - Apr 1 2020

Keywords

postseismic deformation
poroelastic deformation
Costa Rica earthquake
groundwater
Nicoya penninsula

Disciplines

Earth Sciences

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10.1029/2020GL086945License: CC BY

Modeling the Contribution of Poroelastic Deformation to PostseismFinal published version, 12.8 MBLicense: CC BY
Modeling the Contribution of Poroelastic Deformation to PostseismFinal published version, 12.8 MBLicense: CC BY

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title = "Modeling the Contribution of Poroelastic Deformation to Postseismic Geodetic Signals",

abstract = " To constrain the poroelastic component of postseismic deformation, we model the subsurface hydrologic response to the M w 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\&hyphen;perpendicular component. By modeling the time\&hyphen;dependent 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.",

keywords = "postseismic deformation, poroelastic deformation, Costa Rica earthquake, groundwater, Nicoya penninsula",

author = "Kimberly McCormack and Hesse, \{Marc A.\} and Dixon, \{Timothy H.\} and Rocco Malservisi",

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doi = "10.1029/2020GL086945",

language = "American English",

volume = "47",

journal = "Geophysical Research Letters",

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TY - JOUR

T1 - Modeling the Contribution of Poroelastic Deformation to Postseismic Geodetic Signals

AU - McCormack, Kimberly

AU - Hesse, Marc A.

AU - Dixon, Timothy H.

AU - Malservisi, Rocco

PY - 2020/4/1

Y1 - 2020/4/1

N2 - To constrain the poroelastic component of postseismic deformation, we model the subsurface hydrologic response to the M w 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&hyphen;perpendicular component. By modeling the time&hyphen;dependent 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.

AB - To constrain the poroelastic component of postseismic deformation, we model the subsurface hydrologic response to the M w 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&hyphen;perpendicular component. By modeling the time&hyphen;dependent 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.

KW - postseismic deformation

KW - poroelastic deformation

KW - Costa Rica earthquake

KW - groundwater

KW - Nicoya penninsula

UR - https://digitalcommons.usf.edu/geo_facpub/2265

U2 - 10.1029/2020GL086945

DO - 10.1029/2020GL086945

M3 - Article

VL - 47

JO - Geophysical Research Letters

JF - Geophysical Research Letters

ER -

Modeling the Contribution of Poroelastic Deformation to Postseismic Geodetic Signals

Abstract

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