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Johannes Thun

Phd Student

School of Earth Sciences
Geophysics Section
School of Cosmic Physics
Dublin Institute for Advanced Studies
5 Merrion Square, Dublin 2, Ireland

Tel:
Email: johannes.thun@ucdconnect.ie

Biography

Johannes holds a Diplom degree in Geophysics from the Geophysical Institute, Karlsruhe Institute of Technology, Germany, which included 5 months of volunteer research at the Centre of Exchange and Research in Volcanology in Colima, Mexico.

He joined the UCD Geophysics group in 2012 as a PhD student in volcano seismology. He is a Marie Curie Early Stage Researcher in the NEMOH Initial Training Network, the topic of his research being the analysis of Long Period, Tremor and static shift events from very high density seismological networks.

Professional

 

Associations

Association: American Geophysical Union (AGU), Function/Role: Student member
Association: Deutsche Geophysikalische Gesellschaft (DGG), Function/Role: Student Member
Association: International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI), Function/Role: Young Researcher Member
                 

Outreach Activities

1st VERTIGO Workshop in Stromboli, Italy: Invited to give a talk about "Being an Early Stage Researcher in an Initial Training Network" - giving information about benefits and risks of being in that position.
Open Day for school kids: Volcanoes and volcanological research; held in Dun Laoghaire Town Hall.
Co-organised with Dr Aoife Braiden, Beatriz Martinez and Prof. Chris Bean.

 Article and photos on the UCD website
   

Publications

     

Peer Reviewed Journals

Thun, J, Lokmer, I, Bean, CJ (2015) 'New observations of displacement steps associated with volcano seismic long-period events, constrained by step-table experiments'. Geophysical Research Letters, 42 (10):3855-3862. Available Online [DOI] [Details]
 

Conference Publications

Thun, J.,Lokmer, I., Bean, C.J. (2015) Exploring the broad-band nature of volcanic long-period events: Example from Turrialba volcano IUGG General Assembly 2015 Prague, [Details]
Lokmer, I., Thun, J., Bean, C.J. (2015) Broadband moment-tensor inversion of long-period events on volcanoes: example from Turrialba volcano EGU General Assembly Vienna, Austria, , 12-APR-15 - 17-APR-15 [Details]
Thun, J., Bean, C.J., Lokmer, I. (2014) Small quasi-static displacements associated with shallow LP seismic sources AGU Fall Meeting San Francisco, USA, , 15-DEC-14 - 19-DEC-14 [Details]
Thun, J., Bean, C.J. and Lokmer, I. (2014) Detection of quasi-static displacement components of LP seismic sources near the volcanic summit EGU General Assembly 2014 - Geophysical Research Abstracts Volume 16 Vienna, Austria, , 27-APR-14 - 02-MAY-14 [Details]
Thun, J; Bean, C.J.; Lokmer, I. (2014) Small quasi-static displacements associated with shallow LP seismic sources 3rd NEMOH Network School - Inverse methods in geophysics and volcanology Dublin, Ireland, , 31-AUG-14 - 05-SEP-14 [Details]
Thun, J., Bean, C.J. and Lokmer, I. (2014) Analysis of volcanic long-period events with quasi-static displacements from high-density seismological networks EGU General Assembly 2014 - Geophysical Research Abstracts Volume 16 Vienna, Austria, , 27-APR-14 - 02-MAY-14 [Details]
Thun, J.; Bean, C.J.; Lokmer, I. (2013) Links between volcano seismicity and small-scale deformation of the volcanic edifice 2nd NEMOH Network School - Forward Modelling of Volcanic Processes Bristol, United Kingdom, , 18-SEP-13 - 22-SEP-13 [Details]
Thun, J.; Bean, C.J.; Lokmer, I. (2013) Analysis of long-period (LP) events from very high density seismological networks NEMOH Mid-Term review meeting Rome, Italy, , 18-OCT-13 - 18-OCT-13 [Details]
Thun, J.; Bean, C.J.; Lokmer, I. (2013) The relationship between long-period volcano seismicity and small deformations of the volcanic edifice 1st NEMOH Network School - Volcanoes and Magmas: An Introduction to Experimental Volcanology Munich, Germany, , 17-FEB-13 - 22-FEB-13 [Details]
Thun, J; Bean, C.J.; Lokmer, I. (2013) Links between volcano seismicity and small-scale deformation of the volcanic edifice - exploring new ways of detecting small static deformations IAVCEI 2013 Scientific Assembly, Abstract 1W_2F-P7 Kagoshima, Japan, , 20-JUL-13 - 24-JUL-13 [Details]
Thun, J.; Ritter, J.R.R.; Groos, J. (2011) METSEIS: An experiment to quantify meteorological and seismological interactions 71st Annual Conference, Deutsche Geophysikalische Gesellschaft Cologne, Germany, , 21-FEB-11 - 24-FEB-11 [Details]
Ritter, J.R.R.; Thun, J.; Groos, J.; Wenzel, F.; Hauck, C. (2009) METSEIS: An experiment to quantify meteorological and seismological interactions Neustadt Workshop on Noise and Diffuse Wavefields Neustadt, Germany, , 05-JUL-09 - 08-JUL-09 [Details]
         

Dissertations/Theses

Thun, J. (2011) Untersuchung des Einflusses von Wind auf breitbandige seismologische Messungen (Investigation of the influence of wind on broad-band seismological measurements). Karlsruhe Institute of Technology: Dissertations/Theses [Details]
                                                                             

Research

Research Interests

My research focuses on the analysis of seismic long-period (LP) events on various volcanoes. Whereas volcano-tectonic earthquakes on volcanoes are related to brittle failure of rocks (just like earthquakes), the sources of LP seismicity are still not fully understood. Source processes with fluids and resonance are the most widely accepted models for these sources today. However, due to the difficult volcanic environments, very few studies include data from summit-near stations. The Seismology Lab group at UCD has installed several temporary high-density networks in the summit areas of active volcanoes in the past (e.g. Mt Etna, Italy and Turrialba, Costa Rica). The data from stations in the near-field of LP sources (i.e. < 1 ¿ 2 km) show different behaviour than we would expect from a ¿classical¿ LP source.

I am working on the integration of broadband data from near-field stations into seismic source inversion. Their special behaviour (more impulsive waveforms, quasi-static displacements, etc.) can add to the understanding of LP sources, but the data have to be handled with special care. For example, we need to widen the frequency band of the inversion, which makes it more difficult to filter noise and other influences, such as tilt signals, out of the data.

Furthermore I am interested in possible links between long-period seismicity and other volcanic processes, such as deformations of volcanic edifices.