Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/3118
AuthorsHarris, A. J. L.* 
Dehn, J.* 
Patrick, M.* 
Calvari, S.* 
Ripepe, M.* 
Lodato, L.* 
TitleLava effusion rates from hand-held thermal infrared imagery: an example from the June 2003 effusive activity at Stromboli
Issue Date2005
Series/Report no./68(2005)
DOI10.1007/s00445-005-0425-7
URIhttp://hdl.handle.net/2122/3118
KeywordsForward Looking InfraRed (FLIR)
Effusion rate
Stromboli
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 
AbstractA safe, easy and rapid method to calculate lava effusion rates using hand-held thermal image data was developed during June 2003 at Stromboli Volcano (Italy).We used a Forward Looking Infrared Radiometer (FLIR) to obtain images of the active lava flow field on a daily basis between May 31 and June 16, 2003. During this time the flow field geometry and size (where flows typically a few hundred meters long were emplaced on a steep slope) meant that near-vertical images of the whole flow field could be captured in a single image obtained from a helicopter hovering, at an altitude of 750 m and ∼1 km off shore.We used these images to adapt a thermally based effusion rate method, previously applied to low and high spatial resolution satellite data, to allow automated extraction of effusion rates from the hand-held thermal infrared imagery. A comparison between a thermally-derived (0.23–0.87m3 s−1) and dimensionally-derived effusion rate (0.56 m3 s−1) showed that the thermally-derived range was centered on the expected value. Over the measurement period, the mean effusion rate was 0.38±0.25 m3 s−1, which is similar to that obtained during the 1985–86 effusive eruption and the time-averaged supply rate calculated for normal (non-effusive) Strombolian activity. A short effusive pulse, reaching a peak of ∼1.2 m3 s−1, was recorded on June 3, 2003. One explanation of such a peak would be an increase in driving pressure due to an increase in the height of the magma contained in the central column.We estimate that this pulse would require the magma column to attain a height of ∼190 m above the effusive vent, which is approximately the elevation difference between the vent and the floor of the NE crater. Our approach gives an easy-to-apply method that has the potential to provide effusion rate time series with a high temporal resolution.
Appears in Collections:Papers Published / Papers in press

Files in This Item:
File Description SizeFormat 
Harris et al 2005b.pdfmain article473.25 kBAdobe PDFView/Open    Request a copy
Show full item record

Page view(s)

66
checked on May 29, 2017

Download(s)

23
checked on May 29, 2017

Google ScholarTM

Check

Altmetric