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Time Rate of Change of Gravity in North America and Greenland due to Post Glacial Rebound and Other Tectonic Movements

Time Rate of Change of Gravity in North America and Greenland due to Post Glacial Rebound and Other Tectonic Movements

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Title: Time Rate of Change of Gravity in North America and Greenland due to Post Glacial Rebound and Other Tectonic Movements
Author: Kamtchang, Franck Olivier Kapoko
Abstract: In the process to regain isostatic equilibrium following the Last Glacial Maximum, the Earths crust is experiencing continuous uplift and/or subsidence, a phenomenon called Glacial Isostatic Adjustment (GIA). We determine the time rate of change of gravity (g-dot) due to GIA by estimating it directly from a Least-Squares adjustment of an integrated gravity network covering the continent. Observation equations are created based on historical relative gravity measurements and the network is constrained using g-dot values obtained from absolute gravity measurements. Recognizing that gravity variation is also influenced by other significant continuous geophysical processes (tides, tidal load and hydrology), such effects are removed by correcting all gravity measurements at the pre-adjustment stage. Results are presented in the form of a g-dot map and demonstrate that Canadas National Gravity Data Base (NGDB), with its over 50-year-long history, can provide us with useful constraints for the evaluation/verification and refinement of post-glacial rebound models.
Subject: Paleoclimate science
Keywords: Ice Age
Post Glacial Rebound
PGR
Glacial Isostatic Adjustment
GIA
Geoid
Time Rate of Change of gravity
g-dot
North America
Greenland
Gravity
Canadian Gravity Standardization Network
CGSN
Canadian National Gravity Data Base
NGDB
Last Glacial Maximum
LGM
Earth Deformation
Systematic Errors
Constraints
INPUTGRAVNET
Gravimeter Drift
a-priori Variance Factor
a-posteriori Variance Factor
Gravity Stations
Gravity Ties
μGal/a
Hydrology
Body Tides
Ocean Tide Loading
Polar Motion
Least-Squares Spectral Analysis
LSSA
GRAVNET
WaterGAP
WaterGAP Global Hydrology Model
WGHM
GWAVE
LOADSDP
GENLOAD
Finite Element Solution
FES
Time Rate of Change of Geoid Undulation
N-dot
Least-Squares Adjustment
Crustal Motion
Relative Gravimeter
Absolute Gravimeter
Weighted Least-Squares Regression
WLSR
Type: Electronic Thesis or Dissertation
Rights: Author owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.
URI: http://hdl.handle.net/10315/33620
Supervisor: Pagiatakis, Spiros D.
Degree: MSc - Master of Science
Program: Earth & Space Science
Exam date: 2017-04-13
Publish on: 2017-07-27

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