Hannah Buckland

• PhD
• Applications Specialist at Malvern Panalytical

Large magnitude explosive volcanic eruptions occur globally at a rate of 1–2 per 1000 years and can cause devastating global impacts. Despite the risk these eruptions pose, we have no reliable method to forecast whether lower magnitude eruptions are precursory to a larger event. Here we use deposits from the ~7.6 ka eruption of Mount Mazama (Crater...

Estimating tephra fall volumes is critical for assessing the impacts of explosive eruptions and calculating eruption source parameters (ESPs). Estimates are subject to uncertainties that span from measuring deposit thicknesses to the different volume integration models implemented. In this sense, the number of field control points (FCPs) may produ...

Large magnitude (≥7) explosive eruptions (≥ 40km3 DRE) can result in devastating global impacts due to long distance volcanic ash transport and climate disruption caused by volcanic sulphate aerosols. Our understanding of what conditions lead to large eruptions and whether there are precursory indicators of the pending eruption size is limited beca...

Volcanic Ash Transport and Dispersion Models (VATDMs) are necessary for forecasting tephra dispersal during volcanic eruptions and are a useful tool for estimating the Eruption Source Parameters (ESPs) of prehistoric eruptions. Here we use Ash3D, an Eulerian VATDM, to simulate the tephra deposition from the ~7.7 ka climactic eruption of Mount Mazam...

Around once every millenium, a large magnitude explosive eruption occurs on Earth dispersing volcanic ash across millions of square kilometers. Volcanic ash uniquely poses a wide-range of hazards to human health, infrastructure and the environment, the impacts of which are felt close to source to >1000’s of km from the volcano. Importantly for larg...

In this highlight talk Hannah Buckland (Swansea University) shares their work on 'Modelling the transport and deposition of ash following a Magnitude 7 eruption: the Mazama tephra' View on VMSG Youtube channel: https://www.youtube.com/watch?v=3xF5HFmL_4k&list=PLTQB1DrZpoVx0O4R3EfAC771qbJUunkcf This talk was presented at the 2022 virtual meeting...

To quantify the size of tephra, two practical challenges must be addressed: the wide range of particle sizes (10 −8-10 1 m) and the diversity of particle shape, density and optical properties. Here we use dynamic image analysis (DIA) to simultaneously characterise the size and shape of tephra samples from Mount Mazama, Krafla, Mount St. Helens and...

Estimating the area of tephra fallout and volume of large magnitude eruptions is fundamental to interpretations of the hazards posed by eruptions of this scale. This study uses the tephra from the caldera forming eruption of Mount Mazama (Crater Lake, OR, USA) to demonstrate the challenges faced when working with large prehistoric tephra deposits a...

The grain size of explosive volcanic products provides insight into fragmentation and ash transport processes. Importantly, the grain size of volcanic ash determines the risk to human health and the total grain size distribution of volcanic products is a crucial input parameter for ash dispersion models. This study describes the Camsizer X2, a part...

The climactic eruption of Mount Mazama ~7.7 ka in Oregon produced an extensive tephra deposit across the western USA and Canada. Despite the importance of the tephra layer as an isochron, there is considerable uncertainty about the spatial distribution of the distal tephra deposit which is evident in the varied iterations of Mazama isopach maps. To...