Young Natural History Scientists Meeting 2017

I will be at the 4th Young Natural History Scientists Meeting in Paris. This event is dedicated to young researchers (master or PhD students). I will give a talk about my master 1 project, entitled “Lava flow mapping and area estimation using radar coherence images”. Here is the abstract:

Interferometric synthetic aperture radar (InSAR), more specifically calculation of coherence images, can be used to infer changes in the ground surface’s geometry. If these changes come from the emplacement of a lava flow, coherence images can then be used to map the flow. For this purpose, we developed an algorithm which separates the lava flow pixels from the others depending on their median shade. After processing the picture, we get a map and a surface for a given date. By doing this for several dates, we thus can follow the time and space evolution of the lava flow.
For the August – October 2015 eruption of Piton de la Fournaise, available InSAR data allowed us to map the lava flow at nine different dates between 08/29/15 and 11/01/15. We estimated the flow’s area for each date; at the end of the eruption, the total area estimation is 4.251 106 ± 4.5 104 m2. This work could be pursued to map active parts of the flow and to estimate the volume of emitted products.

Hope to see you there!

Pacaya in EARTH Magazine

The October issue of EARTH Magazine has a story about the volcano Pacaya (Guatemala) by Michael Steel. The article features some of the photos I took during my trip there. It was three months after the May 2010 eruption, while the lava flow was still quite hot. Check it out!

Below: Pacaya’s 2010 lava flow rolling over the green hills of Guatemala.