Gabor Kereszturi

Gabor Kereszturi
Massey University · Volcanic Risk Solutions, School of Agriculture and Environment

MSci, PhD in Earth Sciences
Hyperspectral remote sensing, physical volcanology and natural hazards

About

112
Publications
51,107
Reads
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1,849
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Introduction
My research focuses on geospatial mapping and quantifying geological and environmental processes using remote sensing and field-based approaches. In particular, I have shown strong research leadership in developing new hyperspectral remote sensing applications in Earth Science and Agriculture. Currently as a Rutherford Discovery Fellow, I have been working on understanding volcanic hydrothermal systems using hyperspectral remote sensing.
Additional affiliations
January 2019 - present
Massey University
Position
  • Lecturer
January 2017 - January 2019
Massey University
Position
  • Lecturer
January 2017 - present
Massey University
Position
  • Lecturer
Description
  • I teach into undergraduate course, as part of the Earth Sciences BSc program, in the field of Remote Sensing and Geographical Information Systems (GIS).
Education
November 2010 - August 2014
Massey University
Field of study
  • volcanology
September 2004 - June 2009
University of Miskolc
Field of study
  • geomorphology and volcanology

Publications

Publications (112)
Article
Full-text available
Monogenetic basaltic volcanism is characterised by a complex array of behaviours in the spatial distribution of magma output and also temporal variability in magma flux and eruptive frequency. Investigating this in detail is hindered by the difficulty in evaluating ages of volcanic events as well as volumes erupted in each volcano. Eruptive volumes...
Article
Full-text available
Optical and laser remote sensing provide resources for monitoring volcanic activity and surface hydrothermal alteration. In particular, multispectral and hyperspectral imaging can be used for detecting lithologies and mineral alterations on the surface of actively degassing volcanoes. This paper proposes a novel workflow to integrate existing optic...
Article
Full-text available
Hydrothermal systems develop secondary mineral assemblages due to rock and fluid interactions. Such minerals can be identified on the surface and mapped using hyperspectral imaging and thermal remote sensing to complement geothermal exploration and monitoring. These methods are effective in detecting hydrothermal alteration and thermal anomalies of...
Article
Full-text available
Biogeochemistry is an effective and fast approach for orientation studies in mineral exploration. Vegetative cover has been used in a range of geological environments to gain insight into the composition of sub-surface soils and bedrock found at depth; however, there is little to no records of biogeochemistry being coupled within a remote sensing a...
Article
Full-text available
Prolonged volcanic activity can induce surface weathering and hydrothermal alteration that is a primary control on edifice instability, posing a complex hazard with its challenges to accurately forecast and mitigate. This study uses a frequently active composite volcano, Mt Ruapehu, New Zealand, to develop a conceptual model of surface weathering a...
Article
Full-text available
Volcanic eruptions represent hazards for local communities and infrastructure. Monogenetic volcanoes (usually) erupt only once, and then volcanic activity moves to another location, making quantitative assessment of eruptive hazards challenging. Spatio-temporal patterns in the occurrence of these eruptions may provide valuable information on locati...
Presentation
The long-term (ka to ma) degradation of a volcanic edifice is controlled by both regional (e.g., climate, tectonics) and local factors (e.g., original morphology, lithology), resulting in both long-lasting weathering and river incision and short-term hazardous events, such as flank collapses and lahars. Trends among the morphometry of stratovolcano...
Article
Full-text available
Several combinations of proximal sensors, portable x-ray fluorescence spectroscopy (pXRF), visible-near-infrared spectroscopy (vis-NIR), and mid-infrared spectroscopy (MIR) are assessed to quantify multiple soil trace elements (TE) with reliable accuracy. A total 622 topsoil samples (0–20 cm depth) collected at regular 8 km spacing across southern...
Conference Paper
Volcano morphology is the result of complex interactions between constructive and destructive phases. The dynamics of eruptive, intrusive and erosive processes are reflected in the shapes of volcanoes today. Quantifying the morphology and degradation patterns of composite volcanoes can provide new insights into the evolution of these landforms and...
Article
Full-text available
There are currently no reliable methods to determine rock physical and mechanical properties that are not labor or resource intensive, especially at the scale of volcanoes. Using mineralogical-physical-mechanical relationships, we suggest it is possible to derive rock properties from rapid, non-invasive reflectance spectroscopy measurements. To dem...
Article
Full-text available
The use of mass flow simulations in volcanic hazard zonation and mapping is often limited by model complexity (i.e. uncertainty in correct values of model parameters), a lack of model uncertainty quantification, and limited approaches to incorporate this uncertainty into hazard maps. When quantified, mass flow simulation errors are typically evalua...
Article
Lava flows that constitute the current edifice of Taranaki volcano, New Zealand, contain a complex crystal cargo including plagioclase, pyroxene, amphibole, oxides, and rarely olivine. Amphibole textures and mineral chemistry indicate that crystals are pargasitic antecrysts entrained at various depths by ascending magmas. The crystals record a comp...
Conference Paper
Full-text available
Volcanoes are extremely dynamic landforms. They grow by the accumulation of eruptive products and intrusions and degrade by a range of erosion processes such as superficial runoff, chemical and physical weathering, fluvial and glacial incision, and mass movements. In this study, we aim at documenting and quantifying the morphology of natural compos...
Article
Full-text available
Monitoring rice production is essential for securing food security against climate change threats, such as drought and flood events becoming more intense and frequent. The current practice to survey an area of rice production manually and in near real-time is expensive and involves a high workload for local statisticians. Remote sensing technology...
Article
Full-text available
Deception Island (South Shetland Islands) is one of the most active volcanoes in Antarctica, with more than 20 explosive eruptive events registered over the past two centuries. Recent eruptions (1967, 1969, and 1970) and volcanic unrest episodes (1992, 1999, and 2014–2015) demonstrate that volcanic activity is likely occurring in the future. This i...
Article
Full-text available
Deception Island is amongst the most active volcanoes in the Southern Ocean, with over 20 explosive eruptions in the last ca. 200 years. The eruption that formed the caldera at Deception Island occurred 3980 ± 125 calendar years Before Present, and it is the largest eruptive event documented in Antarctica during Holocene. Since then, post-caldera v...
Preprint
Full-text available
The use of mass flow simulations in volcanic hazard zonation and mapping is often limited by model complexity (i.e. uncertainty in correct values of model parameters), a lack of model uncertainty quantification, and limited approaches to incorporate this uncertainty into hazard maps. When quantified, mass flow simulation errors are typically evalua...
Article
Full-text available
Composite volcanoes can progressively weaken through hydrothermal alteration, which may lead to volcano collapse, forming far-reaching debris avalanches. This work reviews and synthesises the type and extent of hydrothermal alteration on Mt Ruapehu, New Zealand, from rock mechanical, mineralogical, hyperspectral imaging and aero-magnetic studies fo...
Conference Paper
Full-text available
Preliminary steps of mineral exploration have always included drilling and other destructive and expensive exploration techniques to quantify ore-deposits underground. This study examines how we can access information on the sub-surface geology by looking at the surface vegetation. We have targeted gold-mineralization along the Hyde-Macraes Shear Z...
Article
Full-text available
Rice (Oryza sativa L.) is a staple food crop for more than half of the world's population. Rice production is facing a myriad of problems, including water shortage, climate, and land-use change. Accurate maps of rice growth stages are critical for monitoring rice production and assessing its impacts on national and global food security. Rice growth...
Conference Paper
Full-text available
Some geothermal areas are largely covered by vegetation, making exploration and monitoring a difficult and expensive task. Therefore, looking for pathfinders/proxies in typical vegetation cover could reveal information from the hydrogeological system remotely. Buffering is a commonly used proximity technique for spatial analyses in remote sensing....
Article
Deception Island is one of the most active volcanoes in Antarctica, with more than 20 monogenetic eruptions during the Holocene. The latest episodes of 1967, 1969, and 1970 have shown that volcanic activity on Deception Island can become a concern for tourists, scientists, and military personnel working on or near the island. The objective of this...
Article
Full-text available
Regular monitoring and mapping of rice (Oryza Sativa) growth phases are essential for industry stakeholders to ensure food production is on track and to assess the impact of climate change on rice production. In Indonesia, high-cost field surveys have been widely used to monitor the rice growth phases. Alternatively, this research proposes a method...
Poster
Full-text available
Geochemistry of volatiles in active volcanoes provides insights into the magmatic processes and evolution at depth, such as magma evolution and degassing, which can be implemented into volcanic hazards assessment. Deception Island is one of the most active volcanoes in Antarctica, with more than twenty explosive eruptions documented over the past t...
Article
Geochemistry of volatiles in active volcanoes provides insights into the magmatic processes and evolution at depth, such as magma evolution and degassing, which can be implemented into volcanic hazards assessment. Deception Island is one of the most active volcanoes in Antarctica, with more than twenty explosive eruptions documented over the past t...
Article
Full-text available
Combining 3D inversion of high resolution aeromagnetic data with airborne hyperspectral imaging creates a new method to map buried structure and hydrothermal alteration, applied to Mt Ruapehu volcano, New Zealand. Hyperspectral imaging is sensitive to surface mineralogy including alteration minerals, while magnetic vector inversion reveals the volu...
Conference Paper
Full-text available
Spectroscopy based soil analysis have gained popularity over traditional wet chemistry methods in the recent years. Wet chemistry techniques are precise, but highly technical and expensive while being time consuming. Spectroscopy based analysis techniques are cheap, fast and easy to use while maintaining reasonable accuracy. In the context of incre...
Poster
Full-text available
Phosphorus fertiliser application in New Zealand intensive agriculture has raised environmental and trade concerns because of unintended long-term cadmium (Cd) accumulation. To manage soil Cd, farmers require monitoring changes in soil Cd. Quantifying topsoil Cd is currently based on wet chemistry. Alternatively, the use of visible-near infrared (V...
Article
We describe the Late Pliocene paleoenvironment and paleoclimate of the Pula fossil site of the western Pannonian Basin, Hungary, which occurs within a lacustrine succession deposited in a volcanic crater (maar). Radiometric dating of adjacent volcanic bodies hosting the fossil-bearing sedimentary assemblages gives an age of 4.25 ± 0.17 Ma (K-Ar). T...
Poster
Full-text available
Deception Island is one of the most active volcanoes in Antarctica, with more than twenty explosive eruptions documented over the past two centuries. Volatiles can provide insights into the magmatic processes and evolution of active volcanoes, which can be implemented into volcanic hazards assessment. Stable isotopes (hydrogen and oxygen) on trappe...
Conference Paper
Full-text available
Hyperspectral data has high potential to predict the biochemical components of grass with high accuracy, although the accuracy can be significantly improved when hyperspectral data is combined with environmental and topographical data. In this study, a fixed wing airborne survey was conducted using a AisaFENIX hyperspectral imager on a hill countr...
Article
Full-text available
Accurate and efficient monitoring of pasture quality on hill country farm systems is crucial for pasture management and optimizing production. Hyperspectral imaging is a promising tool for mapping a wide range of biophysical and biochemical properties of vegetation from leaf to canopy scale. In this study, the potential of high spatial resolution a...
Article
Full-text available
We provide a synthesis of a workshop held in February 2016 to define the goals, challenges and next steps for developing a national probabilistic volcanic hazard model for New Zealand. The workshop involved volcanologists, statisticians, and hazards scientists from GNS Science, Massey University, University of Otago, Victoria University of Wellingt...
Article
New Zealand farming relies heavily on grazed pasture for feeding livestock; therefore it is important to provide high quality palatable grass in order to maintain profitable and sustainable grassland management. The presence of non-photosynthetic vegetation (NPV) such as dead vegetation in pastures severely limits the quality and productivity of pa...
Article
Assessing the performance of multiple spectral–spatial features of a hyperspectral image for classification of urban land cover classes using support vector machines and artificial neural network, " Abstract. Accurate and spatially detailed mapping of complex urban environments is essential for land managers. Classifying high spectral and spatial r...
Article
Full-text available
Spatial forecasting of volcanism and associated hazards in intraplate monogenetic volcanic fields is subject to large uncertainties in both data and models. We demonstrate a novel logistic regression method for mapping phreatomagmatic-magmatic eruption transition susceptibility using near-surface hydrologic, topographic, and geologic data. The meth...
Conference Paper
Airborne and satellite hyperspectral remote sensing is a key technology to observe finite change in ecosystems and environments. The role of such sensors will improve our ability to monitor and mitigate natural and agricultural environments on a much larger spatial scale than can be achieved using field measurements such as soil coring or proximal...
Chapter
Full-text available
The increasing number of field investigations and various controlled benchtop and large‐ scale experiments have permitted the evaluation of a large number of processes involved in the formation of maar‐diatreme volcanoes, the second most common type of small‐ volume subaerial volcanoes on Earth. A maar‐diatreme volcano is recognized by a volcanic c...
Conference Paper
Full-text available
There are more than 300 lava domes within the Taupo Volcanic Zone (TVZ) with a broad range of eruptive volumes and eruption styles recorded over the past 500 ka volcanic activity. The ca. 15 ka Puketerata volcanic complex is located in the Whakamaru Caldera (ca. 350 ka) surrounded by older domes (mostly >200 ka). Detailed geomorphic analysis of the...
Article
Full-text available
The Ohakune Volcanic Complex is a late Pleistocene tuff ring - scoria/spatter cone complex located south of Ruapehu volcano. This small-volume volcano consists of an outer E-W elongated compound tuff ring edifice, three inner scoria-spatter cones and further volcanic depressions, located on the Ohakune Fault. We quantified accurately the variations...
Article
Full-text available
At the eastern boundary of the south Taupo Rift, the NE-striking, rift-bounding Rangipo and the ENE-striking Wahianoa active normal faults intersect. We investigate their intersection at the Upper Waikato Stream to understand the kinematics of a rift termination in an active volcanic area. The Upper Waikato Stream Fault is a previously unrecognised...
Article
Full-text available
On-farm assessment of mixed pasture nutrient concentrations is important for animal production and pasture management. Hyperspectral imaging is recognized as a potential tool to quantify the nutrient content of vegetation. However, it is a great challenge to estimate macro and micro nutrients in heterogeneous mixed pastures. In this study, canopy r...
Article
Full-text available
Remotely sensed topographic datasets are a major source of information in modelling environmental and geomorphic processes. In this investigation, four of the most popular remotely sensed topographic datasets available for the Auckland Volcanic Field (AVF, New Zealand) were compared using high-accuracy control points, such as real-time kinematic gl...
Article
Full-text available
Scoria cones are a common type of basaltic to andesitic small-volume volcanoes (e.g. 10− 1–10− 5 km3) that results from gas-bubble driven explosive eruptive styles. Although they are small in volume, they can produce complex eruptions, involving multiple eruptive styles. Eight scoria cones from the Quaternary Auckland Volcanic Field in New Zealand...
Article
Full-text available
Conical volcanic edifices that are made up from lapilli to block/bomb pyroclastic successions, such as scoria cones, are widespread in terrestrial and extraterrestrial settings. Eruptive processes responsible for establishing the final facies architecture of a scoria cone are not well linked to numerical simulations of their post-eruptive sediment...
Article
Lava flow hazard modelling requires detailed geological mapping, and a good understanding of emplacement settings and the processes involved in the formation of lava flows. Harrat Rahat, Kingdom of Saudi Arabia, is a large volcanic field, comprising about 1000 predominantly small-volume volcanoes most of which have emitted lava flows of various len...