Estimating Thermal Energy Emission and Eruption Rates at Guatemalan Volcanoes Using Estimating Thermal Energy Emission and Eruption Rates at Guatemalan Volcanoes Using

Thermal Data From a FLIR Camera, ASTER, and MODIS Data SourcesThermal Data From a FLIR Camera, ASTER, and MODIS Data SourcesLuke Bowman, Lara Kapelanczyk, Anna Colvin, Otoniel Matías, W.I. Rose, Miriam Rios-Sánchez, Rüdiger Escobar-Wolf V11C-2066Luke Bowman, Lara Kapelanczyk, Anna Colvin, Otoniel Matías, W.I. Rose, Miriam Rios-Sánchez, Rüdiger Escobar-Wolf

Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931

V11C-2066

Abstract

Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931

Santiaguito Dome Complex: Ground-based Analysis Pacaya:AbstractAnalysis of thermal images taken with a Forward-Looking Infrared

Santiaguito Dome Complex: Ground-based Analysis Pacaya:

FLIR AnalysisAnalysis of thermal images taken with a Forward-Looking Infraredcamera has allowed us to establish a baseline data set for threeopen vent volcanoes in Guatemala that vary in composition from

FLIR Analysis

Jan 7,2008open vent volcanoes in Guatemala that vary in composition fromdacite (Santiaguito) to basalt (Fuego and Pacaya). This allows forthe evaluation of total thermal energy output and eruption rates

Jan 7,2008In early 2008, activity at Pacaya was the evaluation of total thermal energy output and eruption rates

using remote sensing and provides satellite thermal remote sensingvalidations. The field data were collected during two field trips in

Pacaya was predominantly situated at the base of north validations. The field data were collected during two field trips in

2008. The Santiaguito data have been atmospherically correctedand analyzed to allow estimates of the emitted thermal energy

Heat Flux ~ 20.8 MJ/s Heat Flux ~ 7.2 MJ/s

at the base of north flank.

and analyzed to allow estimates of the emitted thermal energyand also the equivalent eruption rate (Rose, et al 2008). Usingsimilar techniques, data from Pacaya and Fuego were analyzed to

150 °CHot Central Core

Cool Inner Annulus Discontinuity150 °C

Hot Central Core

Cool Inner Annulus

flank.

We were unable to obtain thermal images similar techniques, data from Pacaya and Fuego were analyzed to

obtain estimated emission of thermal energy along withobservations of vent morphology. The long term goal is to employ

Hot Outer AnnulusHot Outer Annulus Discontinuity obtain thermal images of the active summit crater at Pacaya, observations of vent morphology. The long term goal is to employ

a variety of thermal remote sensing tools, including datacomparison from ASTER and MODIS sources, in order to closely

crater at Pacaya, therefore our estimated heat flux comparison from ASTER and MODIS sources, in order to closely

monitor eruption rates at open vent volcanoes, such asSantiaguito, Fuego and Pacaya. Ultimately, eruption rate estimates

0 °C0 °CJanuary 16, 2005 January 12, 2008 July 2, 2008January 10, 2005

estimated heat flux contains a gap which

Santiaguito, Fuego and Pacaya. Ultimately, eruption rate estimatesat these volcanoes may lead to improved hazard forecasts.

Sahetepy-Engle, 2004 Rose et al, 2008 Rose et al, 2008Varley, 2007

January 16, 2005 January 12, 2008 July 2, 2008January 10, 2005contains a gap which does account for heat loss at the summit.

Santiaguito is a lava dome that has been continuously active since 1922. A new orthophoto geological

Sahetepy-Engle, 2004 Rose et al, 2008 Rose et al, 2008

MODIS analysis at Santiaguito

Varley, 2007Frontal view of active vent Looking down at top of active vent

By adding total thermal heat loss from the frontal view of the active vent with the total heat

loss at the summit.

Santiaguito is a lava dome that has been continuously active since 1922. A new orthophoto geological map of Santiaguito (Escobar et al., 2008) reveals the pattern of continued exogenous growth of the Caliente Vent region in the last decade, consisting mainly of thick flows to the S. Extrusion has been

MODVOLC provides near-real-time thermal alerts of volcanic activity. In

MODIS analysis at Santiaguito By adding total thermal heat loss from the frontal view of the active vent with the total heat loss calculated from the top of the vent, we were able to estimate total thermal heat loss

from Pacaya (~ 28.1 MJ/s). Pacaya’s extrusion rate between 1961 and 2001 was estimated Caliente Vent region in the last decade, consisting mainly of thick flows to the S. Extrusion has been focused on the cylindrical 80 m diameter vent region which displays a thermal circular ring pattern of high temperatures on most observed occasions. This ring marks the alignment of ash vents which drive periodic

thermal alerts of volcanic activity. In this image, thermal anomalies from Fuego, Pacaya and Santiaguito

from Pacaya (~ 28.1 MJ/s). Pacaya’s extrusion rate between 1961 and 2001 was estimated at 0.17 m3/s by Durst et al. in press

temperatures on most observed occasions. This ring marks the alignment of ash vents which drive periodic (about every 0.2 to 2 hour) vertical thermal explosions. Extruded lava moves upward and down the side of the dome, usually to the south. In recent years systematic thermal observations from helicopter and

Fuego, Pacaya and Santiaguito volcanoes can be seen. The geometry of our field survey at Pacaya requires combining two partial views of the

active flow field and this likely underestimates the full heat flow. the dome, usually to the south. In recent years systematic thermal observations from helicopter and ground sites have supplemented satellite data and DEMs to provide data to estimate extrusion rates. At Santiaguito, MODIS often detects

one hot pixel during the dry season, but

active flow field and this likely underestimates the full heat flow.

one hot pixel during the dry season, but not in the rainy season. Most hot pixels reflect a lava flow that occupies only January 13, January 15, reflect a lava flow that occupies only 1/3 to ½ of the pixel area, and there is no correlation between lava area and

Fuego Volcano:

January 13, 2008

January 15, 2008

no correlation between lava area and radiance. Fuego Volcano:

FLIR AnalysisFLIR Analysis

January 13-15 2008January 13-15 2008

150°C

We used FLIR data on the Santiaguito flow to mimic the crack and

A fixed wing flight allowed us to acquire FLIR images of Fuego’s summit

conduit

We used FLIR data on the Santiaguito flow to mimic the crack and crust temperature analysis technique used by Harris et al 2004. Overall the complete range of pixel temperatures barely show

acquire FLIR images of Fuego’s summit crater on Jan 15, 2008. An elongated dike feature was observed.

The number of MODIS thermal alerts at Santiaguito is less during

Overall the complete range of pixel temperatures barely show peaks. Perhaps the small peak at ~235 C⁰ possibly shows crack temperature. Only eight pixels out of 148,454 total pixels fall into this

dike feature was observed.

Total heat flux for the summit crater The number of MODIS thermal alerts at Santiaguito is less during the Guatemalan rainy season typically lasting from May to October. This is likely due to cloudy conditions which block

temperature. Only eight pixels out of 148,454 total pixels fall into this temperature bin.

Total heat flux for the summit crater image is ~ 2.3 MJ/s. Fuego’s activity is sporadic and average extrusion rate October. This is likely due to cloudy conditions which block

detection. The decrease in anomalies detected during 2007-2008, suggests that overall activity at Caliente dome may be

0 C Total heat flux for this image is ~ 42 MJ/sEstimated lava effusion rate is ~ 0.14 m3/s

sporadic and average extrusion rate has been estimated by Lyons et al., in review at 0.18 m3/sec for the period of Flow front rockfalls Jan 11, 20082008, suggests that overall activity at Caliente dome may be

decreasing, and dry season anomalies less prominent. Helicopter image of crater and lava flowEstimated lava effusion rate is ~ 0.14 m3/s

Comparing these values to other data sets indicates decreasing

review at 0.18 m3/sec for the period of 2005-2007.

View from Fuego Observatory View of crater during over flightComparing these values to other data sets indicates decreasing activity at the Caliente dome at Santiaguito.

ConclusionsReferences:•Ball M and H Pinkerton, 2006, Factors affecting the accuracy of thermal imaging cameras in volcanology, J Geophys Res 111, B 11203,

activity at the Caliente dome at Santiaguito.

ConclusionsRemote sensing techniques, both ground-based and satellite-based, provide valuable information related to the detection and monitoring of small thermal anomalies associated

•Ball M and H Pinkerton, 2006, Factors affecting the accuracy of thermal imaging cameras in volcanology, J Geophys Res 111, B 11203, doi: 10.1029/2005JB003829.•Bluth G J S and W I Rose, 2004, Observations of eruptive activity at Santiaguito volcano, Guatemala, J Volcanol Geoth Res 136: 297-

302. information related to the detection and monitoring of small thermal anomalies associated with open vent volcanoes which have eruption rates of less than about 0.2 m3/sec. The effects of the rainy season in tropical regions like Guatemala hinder data gathering and

302.

•Durst, KS, W I Rose, R Escobar-Wolf, A Maclean and MR Sanchez, 2008, Erupted magma volume estimates at Santiaguito and Pacaya Volcanoes, Guatemala, using digital elevation models, Bulletin of Volcanology, in review. effects of the rainy season in tropical regions like Guatemala hinder data gathering and

reduce the quality of data that is gathered during these periods.

Volcanoes, Guatemala, using digital elevation models, Bulletin of Volcanology, in review.•Escobar Wolf, R P, O Matías Gomez and W I Rose, 2008, Geologic map of Santiaguito, Guatemala, unpublished map presented at IAVCEI, Reyjavik, August 2008.

The integration of MODIS, LANDSAT and ASTER data sources into the calculation of total heat flux and effusion rates will help verify data obtained from ground-based approaches.

IAVCEI, Reyjavik, August 2008.•Gonnermann HM and M Manga, 2003, Explosive volcanism may not be an inevitable consequence of magma fragmentation, Nature 426: 432-435.•Harris, A.J.L., Flynn, L.P., Matías, O. and Rose, W. I., 2002, The thermal stealth flows of Santiaguito: implications for the cooling and

Rainy Season

Santiaguito Extrusion Rates flux and effusion rates will help verify data obtained from ground-based approaches.•Harris, A.J.L., Flynn, L.P., Matías, O. and Rose, W. I., 2002, The thermal stealth flows of Santiaguito: implications for the cooling and emplacement of dacitic block lava flows, Geol. Soc. Am. Bull., 114: 533-546.

•Harris, A.J.L., W I Rose and Flynn, L.P., 2003, Temporal trends in Lava Dome extrusion at Santiaguito, 1922-2000, Bulletin of Volcanology Acknowledgments:

Santiaguito Extrusion RatesFor each year (2004-2008) an ASTER image was selected in order •Harris, A.J.L., W I Rose and Flynn, L.P., 2003, Temporal trends in Lava Dome extrusion at Santiaguito, 1922-2000, Bulletin of Volcanology

65: 77-89.•Harris, Andrew J. L., Luke P. Flynn, Otoniel Matías, William I. Rose and Julio Cornejo, 2004, The evolution of an active silicic lava flow field: an ETM+ perspective, J Volcanol Geoth Res 135: 147-168

Acknowledgments:This research is supported by the US National Science Foundation through OISE and PIRE 0530109. Thermal imaging equipment purchased with NSF EAR 0732632. The US Peace Corps

For each year (2004-2008) an ASTER image was selected in order to delineate the area of lava flow(s) contributing to the thermal anomaly based on the SWIR and TIR bands. Extrusion rates were field: an ETM+ perspective, J Volcanol Geoth Res 135: 147-168

•Johnson, J B, A J L Harris, S T M Sahetepy-Engel, R Wolf and W I Rose, 2004, Explosion dynamics of pyroclastic eruptions at Santiaguito Volcano, Geophys Res Lett 31: L 0066010.

0530109. Thermal imaging equipment purchased with NSF EAR 0732632. The US Peace Corps

supports collaborative field work at Guatemalan volcanoes. Our Guatemalan partner organizations INSIVUMEH and CONRED work with us and provide logistical support. Steve

anomaly based on the SWIR and TIR bands. Extrusion rates were calculated following methods described in Harris et al, 2003.

Volcano, Geophys Res Lett 31: L 0066010.

•Lyons, JJ, Waite, GP, Rose, WI, Chigna, G (in review) Patterns in Open vent, Strombolian Behavior at Fuego Volcano, Guatemala 2005-2007•Rodríguez, L.A., Watson, I.M., Rose, W.I., Branan, Y.K., Bluth, G.J.S., Chigna, G., Matías, O., Escobar, D., Carn, S.A. and Fischer, T., 2004,

organizations INSIVUMEH and CONRED work with us and provide logistical support. Steve Sahetapy-Engel provided data and advice. Rob Wright provided MODVOLC data and advice. Nick Varley provided FLIR data. •Rodríguez, L.A., Watson, I.M., Rose, W.I., Branan, Y.K., Bluth, G.J.S., Chigna, G., Matías, O., Escobar, D., Carn, S.A. and Fischer, T., 2004,

SO2 emissions to the atmosphere from active volcanoes in Guatemala and El Salvador, 1999-2002, Journal of Volcanology and Geothermal Research, 138 (3-4), pp. 345-364.

advice. Nick Varley provided FLIR data.

Geothermal Research, 138 (3-4), pp. 345-364.

•Sahetepy-Engel S T M and A J L Harris, 2008, Thermal structure and heat loss at the summit crater of an active lava dome, Bulletin of Volcanology DOI 10.1007/s00445-008-0204-3 •Sahetepy-Engel S T M, L P Flynn, A J L Harris, G J Bluth, W I Rose and O Matías, 2004, Surface temperature and spectral measurements •Sahetepy-Engel S T M, L P Flynn, A J L Harris, G J Bluth, W I Rose and O Matías, 2004, Surface temperature and spectral measurements at Santiaguito Lava Dome, Guatemala, Geophysical Res Lett 31: L19610