@phdthesis{Zorn2020,
  author    = {Zorn, Edgar Ulrich},
  title     = {Monitoring lava dome growth and deformation with photogrammetric methods and modelling},
  doi       = {10.25932/publishup-48360},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-483600},
  school      = {Universit{\"a}t Potsdam},
  pages     = {IX, 167},
  year      = {2020},
  abstract  = {Lava domes are severely hazardous, mound-shaped extrusions of highly viscous lava and commonly erupt at many active stratovolcanoes around the world. Due to gradual growth and flank oversteepening, such lava domes regularly experience partial or full collapses, resulting in destructive and far-reaching pyroclastic density currents. They are also associated with cyclic explosive activity as the complex interplay of cooling, degassing, and solidification of dome lavas regularly causes gas pressurizations on the dome or the underlying volcano conduit. Lava dome extrusions can last from days to decades, further highlighting the need for accurate and reliable monitoring data. This thesis aims to improve our understanding of lava dome processes and to contribute to the monitoring and prediction of hazards posed by these domes. The recent rise and sophistication of photogrammetric techniques allows for the extraction of observational data in unprecedented detail and creates ideal tools for accomplishing this purpose. Here, I study natural lava dome extrusions as well as laboratory-based analogue models of lava dome extrusions and employ photogrammetric monitoring by Structure-from-Motion (SfM) and Particle-Image-Velocimetry (PIV) techniques. I primarily use aerial photography data obtained by helicopter, airplanes, Unoccupied Aircraft Systems (UAS) or ground-based timelapse cameras. Firstly, by combining a long time-series of overflight data at Volc{\´a}n de Colima, M{\´e}xico, with seismic and satellite radar data, I construct a detailed timeline of lava dome and crater evolution. Using numerical model, the impact of the extrusion on dome morphology and loading stress is further evaluated and an impact on the growth direction is identified, bearing important implications for the location of collapse hazards. Secondly, sequential overflight surveys at the Santiaguito lava dome, Guatemala, reveal surface motion data in high detail. I quantify the growth of the lava dome and the movement of a lava flow, showing complex motions that occur on different timescales and I provide insight into rock properties relevant for hazard assessment inferred purely by photogrammetric processing of remote sensing data. Lastly, I recreate artificial lava dome and spine growth using analogue modelling under controlled conditions, providing new insights into lava extrusion processes and structures as well as the conditions in which they form. These findings demonstrate the capabilities of photogrammetric data analyses to successfully monitor lava dome growth and evolution while highlighting the advantages of complementary modelling methods to explain the observed phenomena. The results presented herein further bear important new insights and implications for the hazards posed by lava domes.},
  language  = {en}
}
@phdthesis{Shirzaei2010,
  author    = {Shirzaei, Manoochehr},
  title     = {Crustal deformation source monitoring using advanced InSAR time series and time dependent inverse modeling},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-50774},
  school      = {Universit{\"a}t Potsdam},
  year      = {2010},
  abstract  = {Crustal deformation can be the result of volcanic and tectonic activity such as fault dislocation and magma intrusion. The crustal deformation may precede and/or succeed the earthquake occurrence and eruption. Mitigating the associated hazard, continuous monitoring of the crustal deformation accordingly has become an important task for geo-observatories and fast response systems. Due to highly non-linear behavior of the crustal deformation fields in time and space, which are not always measurable using conventional geodetic methods (e.g., Leveling), innovative techniques of monitoring and analysis are required. In this thesis I describe novel methods to improve the ability for precise and accurate mapping the spatiotemporal surface deformation field using multi acquisitions of satellite radar data. Furthermore, to better understand the source of such spatiotemporal deformation fields, I present novel static and time dependent model inversion approaches. Almost any interferograms include areas where the signal decorrelates and is distorted by atmospheric delay. In this thesis I detail new analysis methods to reduce the limitations of conventional InSAR, by combining the benefits of advanced InSAR methods such as the permanent scatterer InSAR (PSI) and the small baseline subsets (SBAS) with a wavelet based data filtering scheme. This novel InSAR time series methodology is applied, for instance, to monitor the non-linear deformation processes at Hawaii Island. The radar phase change at Hawaii is found to be due to intrusions, eruptions, earthquakes and flank movement processes and superimposed by significant environmental artifacts (e.g., atmospheric). The deformation field, I obtained using the new InSAR analysis method, is in good agreement with continuous GPS data. This provides an accurate spatiotemporal deformation field at Hawaii, which allows time dependent source modeling. Conventional source modeling methods usually deal with static deformation field, while retrieving the dynamics of the source requires more sophisticated time dependent optimization approaches. This problem I address by combining Monte Carlo based optimization approaches with a Kalman Filter, which provides the model parameters of the deformation source consistent in time. I found there are numerous deformation sources at Hawaii Island which are spatiotemporally interacting, such as volcano inflation is associated to changes in the rifting behavior, and temporally linked to silent earthquakes. I applied these new methods to other tectonic and volcanic terrains, most of which revealing the importance of associated or coupled deformation sources. The findings are 1) the relation between deep and shallow hydrothermal and magmatic sources underneath the Campi Flegrei volcano, 2) gravity-driven deformation at Damavand volcano, 3) fault interaction associated with the 2010 Haiti earthquake, 4) independent block wise flank motion at the Hilina Fault system, Kilauea, and 5) interaction between salt diapir and the 2005 Qeshm earthquake in southern Iran. This thesis, written in cumulative form including 9 manuscripts published or under review in peer reviewed journals, improves the techniques for InSAR time series analysis and source modeling and shows the mutual dependence between adjacent deformation sources. These findings allow more realistic estimation of the hazard associated with complex volcanic and tectonic systems.},
  language  = {en}
}
@article{Pieper2006,
  author    = {Pieper, Herbert},
  title     = {Die Geognosie der Vulkane},
  volume    = {VII},
  number    = {13},
  publisher = {Universit{\"a}tsverlag Potsdam},
  address   = {Potsdam},
  issn      = {1617-5239},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-35646},
  pages     = {75 -- 81},
  year      = {2006},
  abstract  = {The paper deals with Alexander von Humboldt's researches into the "Geognosy" of volcanoes. In the long run these researches led him to changing his views from the "neptunistic" doctrine of Abraham Gottlob Werner to the concept of "vulcanism".},
  language  = {de}
}
@misc{JobstKnoblochLeitneretal.2006,
  author    = {Jobst, Anne and Knobloch, Eberhard and Leitner, Ulrike and Mikosch, Regina and Pieper, Herbert and Schwarz, Ingo and Bourguet, Marie-No{\"e}lle and Ette, Ottmar and Suckow, Christian and Thiemer-Sachse, Ursula and Faak, Margot},
  title     = {HiN : Alexander von Humboldt im Netz = Festschrift f{\"u}r Margot Faak zu Ehren ihres 80. Geburtstages},
  volume    = {VII},
  number    = {13},
  editor    = {Ette, Ottmar and Knobloch, Eberhard},
  publisher = {Universit{\"a}tsverlag Potsdam},
  address   = {Potsdam},
  issn      = {1617-5239},
  doi       = {10.18443/hinvol7iss132006},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-35709},
  pages     = {115},
  year      = {2006},
  abstract  = {Inhalt: - Die Mitarbeiter der Avh-Forschungsstelle: Margot Faak zum 80. Geburtstag - Marie-No{\"e}lle Bourguet: La fabrique du savoir. Essai sur les carnets de voyage d'Alexander von Humboldt - Ottmar Ette: Unterwegs zu einer Weltwissenschaft? Alexander von Humboldts Weltbegriffe und die transarealen Studien - Eberhard Knobloch: Erkundung und Erforschung - Alexander von Humboldts Amerikareise - Herbert Pieper: Die Geognosie der Vulkane - Christian Suckow: Prinz Humboldt - Ursula Thiemer-Sachse: !'Qu{\´e} arte es comprender el arte ...! La visi{\´o}n del arte ind{\´i}gena de Am{\´e}rica por Alejandro de Humboldt - Margot Faak: G. W. Leibniz im Urteil Alexander von Humboldts - Regina Mikosch, Ingo Schwarz: Bibliographie zu Margot Faak},
  language  = {mul}
}