Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 30172
Detailed Mapping of Pyroclastic Flow Deposits by SAR Data Processing for an Active Volcano in the Torrid Zone

Authors: Asep Saepuloh, Katsuaki Koike


Field mapping activity for an active volcano mainly in the Torrid Zone is usually hampered by several problems such as steep terrain and bad atmosphere conditions. In this paper we present a simple solution for such problem by a combination Synthetic Aperture Radar (SAR) and geostatistical methods. By this combination, we could reduce the speckle effect from the SAR data and then estimate roughness distribution of the pyroclastic flow deposits. The main purpose of this study is to detect spatial distribution of new pyroclastic flow deposits termed as P-zone accurately using the ╬▓┬░data from two RADARSAT-1 SAR level-0 data. Single scene of Hyperion data and field observation were used for cross-validation of the SAR results. Mt. Merapi in central Java, Indonesia, was chosen as a study site and the eruptions in May-June 2006 were examined. The P-zones were found in the western and southern flanks. The area size and the longest flow distance were calculated as 2.3 km2 and 6.8 km, respectively. The grain size variation of the P-zone was mapped in detail from fine to coarse deposits regarding the C-band wavelength of 5.6 cm.

Keywords: Geostatistical Method, Mt. Merapi, Pyroclastic, RADARSAT-1.

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1022


[1] S. A. Carn, "Application of Synthetic Aperture Radar (SAR) imagery to volcano mapping in the humid tropics: A case study in East Java, Indonesia", Bulletin of Volcanology, vol. 61, 1999, pp. 92-105.
[2] D. Massonnet, P. Briole, and A. Arnaud, "Deflation of Mt. Etna monitored by spaceborne radar interferometry", Nature, vol. 375, 1995, pp567-570.
[3] F. Sigmundsson, P. Durnand, and D. Massonnet, "Opening of an eruptive fissure and seaward displacement at Piton de la Fournaise volcano measured by RADARSAT satellite radar interferometry", GRL, vol. 26, 1999, pp. 533-536.
[4] H.A. Zebker, P. Rosen, S. Hensley, and P. Mouginis-Mark, "Analysis of active lava flows on Kilauea volcano, Hawaii, using SIR-C radar correlation measurement", Geology, vol. 24, 1996, 495-498.
[5] B. Voight, E. K. Constantine, S. Siswowidjoyo, R. and Torley, "Historical eruptions of Merapi volcano, Central Java, Indonesia, 1768-1998", J. Vol. and Geoth. Res., vol. 100, 2000, pp. 69-138.
[6] N. Shepherd, "Extraction of beta nought and sigma nought from RADARSAT CDPF products", Report AS97-5001 Rev. 2, Canadian Space Agency, Ottawa, Ont., Canada, 1998.
[7] N. F. Glenn and J. R. Carr, "Establishing a relationship between soil moisture and RADARSAT-1 SAR data obtained over the Great Basin, Nevada, U.S.A.", Canadian Journal of Remote Sensing, Vol. 30, No. 2, 2004, pp. 176-181.
[8] R. F. Fudali and W. G. Melson, "Ejecta velocities, magma chamber pressure and kinetic energy associated with the 1968 eruption of Arenal volcano", Bulletin of Volcanology, vol. 35, 1971, pp. 383-401.
[9] G. Lube, S. J. Cronin, T. Platz, A. Freundt, J. N. Procter, C. Henderson, and M. F. Sheridan, "Flow and deposition of pyroclastic granular flows: a type example from the 1975 Ngauruhoe eruption, New Zealand", Journal of Volcanology and Geothermal Research, vol. 161, 2006, pp. 165-186.