My masters and doctorate research were both dedicated to volcano seismology. At the University of Leeds, under the supervision of Prof. Neuberg, my MGeophys dissertation was titled "Investigations into the trigger mechanism of LP events at Soufriere Hills volcano, Montserrat". The project involved travelling to Montserrat to collaborate with scientists at the Montserrat Volcano Observatory. My PhD thesis was titled “Discriminating between spatial and temporal variations in seismic anisotropy at active volcanoes”, and was carried out under the supervision of Prof. Savage and Dr. Townend at Victoria University of Wellington. During my PhD, I travelled to Anchorage, Alaska, to work with Dr. Prejean at AVO, researching the seismicity associated with the 2008 eruption of Okmok Volcano. The majority of my PhD research concentrated on Mt. Ruapehu Volcano in New Zealand. There are several major products resulting from that project. Through collaboration with scientists at GNS Science, I carried out two temporary deployments of seismometers. The deployments, and analysis of the data, resulted in what is possibly the largest database of SWS at any volcano. Another major product of my PhD was the development of the software to map seismic anisotropy, available to download here.
I completed a two-year research fellowship at the Hawaiian Volcano Observatory (HVO), where I worked on two projects. The first was to carry out SWS analysis at Kilauea for the first time for several decades. The second project was to develop FEMs to explain unique patterns of ground deformation observed at Kilauea. My second post-doctoral position was at the University of Bristol on a Marie Curie Incoming International Fellowship. My main project was to develop a method of coupling micro- and macro-scale processes using finite element analysis with a view to model fluid movement and its effects on elastic properties of subsurface rocks. Other projects included analysis of volcano-tectonic earthquakes at Tungurahua volcano, seismicity and deformation associated with fluid movement at Kilauea volcano, investigation into repeating earthquakes near Ruapehu volcano, and stress and strain modelling of various tectonic regimes using finite element analysis.
Lecturer in Solid Earth Geophysics (2015)
Marie Curie International Incoming Fellowship (2013)
Research Fellow through the cooperative agreement between the USGS- Hawaiian Volcano Observatory and the University of Hawaii at Hilo (2011)
PhD Geophysics, Victoria University of Wellington (2011)
MSci Geophysics (North America) 1st Class Honours, University of Leeds (2007)
Episodic deflation–inflation events at Kīlauea Volcano and implications for the shallow magma system,
in Hawaiian Volcanoes: From Source to Surface : American Geophysical Union Monograph .
American Geophysical Union
pp. 229Full Text
Crustal stress and structure at Kīlauea Volcano inferred from seismic anisotropy,
in Hawaiian Volcanoes: From Source to Surface : American Geophysical Union Monograph.
American Geophysical Union
pp. 251Full Text
Seismic Anisotropy in Volcanic Regions,
in Encyclopedia of Earthquake Engineering.
Springer-Verlag Berlin Heidelberg
pp. 1-16Full Text
(Entry for encyclopedia/dictionary)
Seismic detection of increased degassing before Kilauea's 2008 summit explosion,
in Nature Communications
4Full Text UEA Repository
Tracking volcanic and geothermal activity in the Tongariro Volcanic Centre, New Zealand, with shear wave splitting tomography,
in Journal of Volcanology and Geothermal Research
pp. 1-10Full Text UEA Repository
Temporal and spatial evolution of hypocentres and anisotropy from the Darfield aftershock sequence: implications for fault geometry and age,
in New Zealand Journal of Geology and Geophysics
pp. 287-293Full Text UEA Repository
Distinguishing between stress-induced and structural anisotropy at Mount Ruapehu volcano, New Zealand,
in Journal of Geophysical Research: Solid Earth
article no. 303Full Text UEA Repository
The Erua earthquake cluster and seismic anisotropy in the Ruapehu region, New Zealand,
in Geophysical Research Letters
article no. L16315Full Text UEA Repository
Anisotropy, repeating earthquakes, and seismicity associated with the 2008 eruption of Okmok volcano, Alaska,
in Journal of Geophysical Research
article no. B00B04Full Text UEA Repository
Key Research Interests
My main research interests are in geophysical hazards, specifically volcano seismology and geodesy, and earthquake seismology.
The role of subsurface fluid movement in the generation and evolution of geophysical hazards is an important topic of research for understanding the mechanism and driving forces of volcanic eruptions and large earthquakes, and also for improving our ability to monitor and forecast disastrous events. In my research, I use seismology and ground deformation to quantify the effects of subsurface fluid movement of the critical systems in question.
Current research projects include: repeating earthquakes near Mount Ruapehu Volcano in New Zealand, seismic anisotropy at volcanoes in Ecuador and Iceland, deformation and seismicity associated with magma movement at Kilauea Volcano in Hawaii.
Jessica Johnson is module organiser for the modules ENV-5004B: Solid Earth Geophysics, and ENVK5005B: Solid Earth Geophysics with Fieldcourse.
She also teaches on ENV-6001B Earthquake and Volcanic Hazards.
Fieldwork Representative on the Health and Safety Committee
Member of the Media and Marketing Committee