sample

SéBASTIEN VALADE

PostDoc fellow


My research interests are related to the observation, modelling, and hazard assessment of volcanic eruptive processes:
Observation – I operate geophysical remote sensing techniques (infrared imagery, infrasound, seismic, radar) to observe volcanic processes (pyroclastic emissions, lava flow, lava lake, …), through both temporary and permanent instrument deployments (ad hoc scientific campaigns and permanent monitoring networks). Data analysis techniques include signal processing and computer vision (particle image velocimetry).
Modelling – I develop forward numerical models to reproduce source processes and synthetic geophysical signals, and use inverse modelling to constrain input parameters and subsequent source parameters.
Hazard assessment – I participate in the installation and management of geophysical monitoring networks of active volcanoes (Stromboli, Etna) for the Italian Civil Protection. This involves instrumentation design/installation, and algorithm development/automation for real-time data transmission, acquisition, processing, and web-publishing. Hazard management is approached through development of automatic alert systems, and communication with decision-making authorities during eruptive crisis.

CONTACTS



Email : sebastien.valade@unifi.it / valade.sebastien@gmail.com

Website :

Phone : +39 055 2757574

Address : Dip. Scienze della Terra, Via G. La Pira n. 4, 50121, Firenze, Italy

PUBLICATIONS



Valade S., Lacanna G., Coppola D., Laiolo M., Pistolesi M., Delle Donne D., Genco R., Marchetti E., Ulivieri G., Allocca C., Cigolini C., Nishimura T., Poggi P. and Ripepe M. (2016), Tracking dynamics of magma migration in open-condiut systems. Bullettin of Volcanology, 78:78, DOI: 10.1007/s00445-016-1072-x

Vulpiani, G., Ripepe, M., Valade, S. (2016) Mass discharge rate retrieval combining weather radar and thermal camera observations, Journal of Geophysical Research (Solid Earth), 121(8) 5679–5695, doi: 10.1002/2016JB013191

Donnadieu, F., Freville, P., Hervier, C., Coltelli, M., Scollo, S., Prestifilippo, M., Valade, S. Rivet, P. Cacault (2016). Near-source Doppler radar monitoring of tephra plumes at Etna, Journal of Volcanology and Geothermal Research, 312, 26-39, doi: 10.1016/j.jvolgeores.2016.01.009

Cerminara, M., Ongaro, T., Valade, S. , Harris A. (2015) Volcanic plume vent conditions retrieved from infrared images: a forward and inverse modeling approach, Journal of Volcanology and Geothermal Research, doi: 10.1016/j.jvolgeores.2014.12.015

Menard, G., Moune, S., Vlastélic, I., Aguilera, F., Valade, S. , Bontemps, M., González, R. (2014) Gas and aerosol emissions from Lascar volcano (Northern Chile): Insights into the origin of gases and their links with the volcanic activity, Journal of Volcanology and Geothermal Research, 287, 51-67, ISSN 0377-0273, doi: 10.1016/j.jvolgeores.2014.09.004

Valade, S. , Harris, A., Cerminara, M. (2014) Plume Ascent Tracker: Interactive Matlab software for analysis of ascending plumes in image data, Computers & Geosciences, 66, 132-144, ISSN 0098-3004, doi:10.1016/j.cageo.2013.12.015

Harris, A, Valade, S. , Sawyer, G., Donnadieu, F., Battaglia J., Gurioli L., Kelfoun K., Labazuy P., Stachowicz, T., Bombrun M., Barra, V., Delle Donne, D., and Lacanna G. (2013) Modern Multispectral Sensors Help Track Explosive Eruptions, E.O.S., 94, 37, p.321-322

Valade, S. and F. Donnadieu (2011) Ballistics and ash plumes discriminated by Doppler radar, Geophysical Research Letters, 38, L22301, doi:10.1029/2011GL049415

Valade, S. , Donnadieu, F., Lesage, P., Mora, M. M., Harris, A., Alvarado, G. E. (2012) Explosion mechanisms at Arenal volcano, Costa Rica: an interpretation from integration of seismic and Doppler radar data, Journal of Geophysical Research, doi:10.1029/2011JB008623

Donnadieu, F., Valade, S. , Moune, S. (2011) Three dimensional transport speed of wind-drifted ash plumes using ground-based radar, Geophysical Research Letters, 38, L18310, doi:10.1029/2011GL049001

Gouhier, M., Harris, A., Calvari, S., Labazuy, P., Guéhenneux, Y., Donnadieu, F., Valade, S. (2011) Lava discharge during Etna’s 11-13 January 2011 fire fountain event tracked using MSG-SEVIRI, Bulletin of Volcanology, doi:10.1007/s00445-01-0572-y

Mora, M., Lesage, P., Donnadieu, F., Valade, S. , Schmidt, A., Soto, G., Taylor, W., Alvarado, G. (2009). Joint Seismic, Acoustic and Doppler Radar observations at Arenal Volcano, Costa Rica: preliminary results. In: Bean, C. J., Braiden, A. K., Lokmer, I., Martini, F., O’Brien, G. S. VOLUME project, EU PF6 (No. 018471). ISBN 978-1-905254-39-2, VOLUME Project Consortium, Dublin