Understanding the interplay between vertical land motion and hydrological loading in the Australian mainland

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Agha Karimi, Armin, Ghobadi-Far, Khosro and Razeghi, Mahdiyeh. 2023. "Understanding the interplay between vertical land motion and hydrological loading in the Australian mainland." American Geophysical Union, Fall Meeting 2023. San Francisco, United States 11 - 15 Dec 2023
Paper/Presentation Title

Understanding the interplay between vertical land motion and hydrological loading in the Australian mainland

Presentation TypePresentation
AuthorsAgha Karimi, Armin, Ghobadi-Far, Khosro and Razeghi, Mahdiyeh
Year2023
Web Address (URL) of Paperhttps://agu.confex.com/agu/fm23/meetingapp.cgi/Paper/1378613
Web Address (URL) of Conference Proceedingshttps://www.arcus.org/events/arctic-calendar/6185
Conference/EventAmerican Geophysical Union, Fall Meeting 2023
Event Details
American Geophysical Union, Fall Meeting 2023
Parent
Fall Meeting of the American Geophysical Union
Delivery
In person
Event Date
11 to end of 15 Dec 2023
Event Location
San Francisco, United States
Event Web Address (URL)
Abstract

This study investigates the cause of Vertical Land Movement (VLM) across the Australian mainland using 29 CORS GNSS stations operating between 2010-2022, with a focus on the role of hydrologic loading on various timescales. In addition to the corrections that are already applied to the daily VLM time series from Nevada Geodetic Laboratory, the effect of non-tidal atmospheric and ocean loadings as well as glacial Isostatic adjustment are removed from the dataset. The CSR mascon solution of GRACE and GRACE-FO data are also used to calculate the elastic loading of Earth's crust due to total water storage changes. Both VLM and hydrological loading signals are decomposed into seasonal and interannual components to analyse the role of hydrological loading in variations of the VLM. The strong correlation between the two datasets indicates that the hydrological loading is the governing factor on the seasonal timescale in most of the stations, and on the interannual timescale, there is no country-wide pattern, but significant correlations can be seen in northern Australia. We also estimated the explained variance to quantify the role of hydrological loading on both timescales, and the results indicate a trivial contribution from GRACE-estimated displacement to the variations on the interannual time scale in Western Australia and Queensland. However, this is in contrast with the fact that Western Australia experiences considerable variations on this timescale. We also estimated the linear trend of VLM over three periods of 2010-2016, 2016-2022, and 2010-2022 to see if the trend persists over time. The displacement emanating from the hydrological loading is regressed in the displacement rate estimations to remove its effect. The result shows a clear drop in the rate of subsidence in Western Australia while VLM of the stations in other areas do not present unified patterns.

Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020370402. Earth and space science informatics
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Byline AffiliationsUniversity of Southern Queensland
University of Colorado Boulder, United States
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