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Remote Measurements of Lava Flux at Arenal and Soufrière Hills Volcanoes using AVTIS G. Wadge 1, D.G. Macfarlane 2, M. James 3, D.A. Robertson 2, H. Pinkerton.

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Presentation on theme: "Remote Measurements of Lava Flux at Arenal and Soufrière Hills Volcanoes using AVTIS G. Wadge 1, D.G. Macfarlane 2, M. James 3, D.A. Robertson 2, H. Pinkerton."— Presentation transcript:

1 Remote Measurements of Lava Flux at Arenal and Soufrière Hills Volcanoes using AVTIS G. Wadge 1, D.G. Macfarlane 2, M. James 3, D.A. Robertson 2, H. Pinkerton 3, H. Odbert 1 and L.J.Applegarth 3 1. ESSC, University of Reading 2. School of Physics and Astronomy, University of St. Andrews 3. Environment Centre, Lancaster University OVSICORI UNA

2 AVTIS Concept

3 Instrument FMCW 94 GHz radar 0.3 m Antenna Pan & Tilt Positioner Laptop Control 2 Car Batteries Prototype AVTIS Field Instrument 1m range resolution 2 K temperature resolution Spot size radar =9 m/ km Spot size radiom.=12/ km Imaging rate = 4 pixels/sec.

4 Arenal, Costa Rica: April 2005 Low effusion rate basaltic andesite lava flows from the summit WEST FLOW SOUTH FLOW

5 Arenal: Radar Surveyed Topography Reflected power (dBr)

6 Arenal, South Flow: Radar Surveyed Topography

7 Arenal South Flow, from Southwest 24/04/05

8 Arenal South Flow, from Southwest 28/04/05

9 Arenal South Flow, from Southwest 30/04/05

10 Arenal SouthLava Flow: Volume changes gives extrusion rates South View Height Changes Day 1-5 Day 5-9 Day 1-9 Extrusion Rates Southwest view Day 2 to 8 = / m 3 /s Day 2 to 6 = / m 3 /s Day 6 to 8 = / m 3 /s South View Day 1 to 5 = / m 3 /s Day 5 to 9 = / m 3 /s Day 1 to 9 = / m 3 /s

11 … and change shape … Soufrière Hills, Montserrat Collapsing dome, often hidden by clouds

12 Montserrat,Perche’s viewpoint: 25 Oct., 2005 AVTIS DEMPhoto

13 Montserrat,Perche’s viewpoint: 4 Nov., 2005

14 Vertical surface height change: 25 Oct. - 4 Nov Extrusion Rate: 1.1 ± 0.1 m 3 s -1

15 AVTIS mm-wave radiometer IR 4 Nov thermal images of the Soufriere Hills lava dome FLIR IR camera

16 IR 4 Nov thermal images of the Soufriere Hills lava dome

17

18 Conclusions AVTIS radar and radiometer tested through cloud out to 7 km At Arenal, 15 m thick basaltic andesite flows were measured over 8 days from a range of 3 km giving a flux of 0.2 ± 0.08 m 3 s -1 At Soufrière Hills, endogenous andesitic dome growth was measured over 10 days from a range of 1.2 km giving a flux of 1.1 ± 0.1 m 3 s -1


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