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The role of salt supply, dissolution, and erosion on the surface deformation of emergent salt diapirs based on analysis of Persistent Scatterer Interferometry data

Zebari, Mjahid und Friedrich, Anke und Rieger, Stefanie und Plattner, Christina und Brcic, Ramon und Závada, Prokop (2023) The role of salt supply, dissolution, and erosion on the surface deformation of emergent salt diapirs based on analysis of Persistent Scatterer Interferometry data. EGU 2023, 2023-04-23 - 2023-04-28, Wien, Österreich. doi: 10.5194/egusphere-egu23-12200.

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Kurzfassung

In the emergent (subaerial) salt diapirs, the salt faces negative buoyancy when extruded to the surface, and flows outward around their vent by gravity spreading. It also faces dissolution and erosion. Salt supply, salt flow, dissolution, and erosion also influence the diapir’s shape. Although satellite geodesy monitors the surface deformation of the salt-caprock glacier system, the interpretation of the resulting deformation pattern in terms of salt supply, dissolution, and erosion is not straightforward. To overcome these shortcomings, we analyze surface deformation pattern of a fountain-shaped and nearly symmetrical diapir (Finu) within the Zagros Belt of Iran using Persistent Scatterer Interferometry (PSI). The PSI data are extracted from the Sentinel-1 SAR images using the Integrated Wide Area Processor (IWAP) at the German Aerospace Center (DLR) covering four years from October 2014 to December 2018. The line-of-sight signal from the PSI data is decomposed into the vertical and horizontal deformation signals. Within the diapir, the deformation signal is then spatially correlated with the influencing factors, including local position within the diapir, slope, karstification, and drainage. Along an E-W profile across the diapir, two-dimensional deformation vectors reflect salt supply and spreading; therefore, the magnitude and direction of these vectors are influenced by their local position within the diapir and the slope. There is a slight uplift in the central part of the salt domes with active salt extrusion. The deformation vectors divert outward in the slope direction, and the deformation reaches its maximum magnitude at the upper flanks of the central dome. The deformation decreases in the outer flat plateau regions of the extrusions and continues to decrease in the steep slopes at their lateral terminations. Along the same profile, relatively higher subsidence is detected in areas where sinkholes are abundant. In these regions, salt is removed in the subsurface by dissolution-driven karst development in contrast to areas where the surface drainage system is developed, and fluvial erosion is dominant. In the future, a better understanding of the factors controlling salt spreading around the vent and the impacts of dissolution/erosion mechanisms on the deformation will improve our ability to interpret surface deformation of the salt-caprock system at unprecedented spatial and temporal resolution.

elib-URL des Eintrags:https://elib.dlr.de/193694/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:The role of salt supply, dissolution, and erosion on the surface deformation of emergent salt diapirs based on analysis of Persistent Scatterer Interferometry data
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Zebari, Mjahidm.zebari (at) lmu.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Friedrich, Ankefriedrich (at) lmu.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Rieger, Stefaniestefanie.rieger (at) iaag.geo.uni-muenchen.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Plattner, ChristinaChristina.Plattner (at) iaag.geo.uni-muenchen.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Brcic, RamonRamon.Brcic (at) dlr.dehttps://orcid.org/0000-0001-6661-9170148027052
Závada, Prokopzavada (at) ig.cas.czhttps://orcid.org/0000-0003-1702-3770NICHT SPEZIFIZIERT
Datum:25 April 2023
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
DOI:10.5194/egusphere-egu23-12200
Status:veröffentlicht
Stichwörter:salt diapirs, surface deformation, persistent scatterer interferometry
Veranstaltungstitel:EGU 2023
Veranstaltungsort:Wien, Österreich
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:23 April 2023
Veranstaltungsende:28 April 2023
Veranstalter :EGU
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - SAR-Methoden, R - Optische Fernerkundung
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Methodik der Fernerkundung > SAR-Signalverarbeitung
Hinterlegt von: Brcic, Dr. Ramon
Hinterlegt am:06 Mär 2023 13:53
Letzte Änderung:24 Apr 2024 20:54

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