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Published November 8, 2011 | Published + Supplemental Material
Journal Article Open

A survey of volcanic deformation on Java using ALOS PALSAR interferometric time series

Abstract

Of the hundreds of volcanic centers throughout the Indonesian archipelago, few are adequately monitored for pre-eruptive activity due to socioeconomic and logistical barriers, with the result that volcanic hazards in the region are not well quantified. The advent of satellite-borne L-band synthetic aperture radar provides an opportunity for detection and measurement of volcanic deformation over broad regions in heavily vegetated tropical island arcs. We use data from the PALSAR instrument on the Japanese ALOS satellite to conduct a comprehensive survey of volcanic deformation on the Indonesian island of Java, over a time period of two years (2007–2008). To obtain the most complete, temporally continuous record of ground deformation, we use a temporally overlapping set of short-time-interval radar image pairs to produce a deformation time series. Consistent with previous results from other regions, our survey suggests that volcanoes experiencing small eruptions are typically fed by magma bodies too small and/or too shallow or deep to produce a recognizable InSAR signal. However, we identified a deformation event at Lamongan volcano which is likely linked to a magmatic intrusion at several kilometers' depth, and a second one at Slamet volcano at a shallower depth that may have been related to a subsequent eruption. This initial test of a broad application of L-band data allowed us to better define the satellite imaging criteria required for successful observation, as well as developing a useful methodology for monitoring deformation over a wide region.

Additional Information

© 2011 by the American Geophysical Union. Received 8 July 2011; Revised 20 September 2011; Accepted 30 September 2011; Published 8 November 2011. This paper was improved thanks to thoughtful reviews by Jeff Freymueller and Chris Newhall. We would also like to thank Chris Newhall, Simon Carn, and Surono for sharing their expertise regarding volcanic activity on Java, Yu-Nung Nina Lin and Chris DiCaprio for their assistance with InSAR processing techniques, Eric Fielding, Sang-Ho Yun, and Paul Rosen for their help with ROI_PAC, and Faria Chowdhury for developing a data management system for ROI_PAC. This study was supported in part by the Gordon and Betty Moore Foundation. This is Caltech Tectonics Observatory contribution 180 and SeismoLab contribution 10064.

Attached Files

Published - Philibosian2011p16464Geochem_Geophy_Geosy.pdf

Supplemental Material - FigureS1.pdf

Supplemental Material - FigureS10.pdf

Supplemental Material - FigureS11.pdf

Supplemental Material - FigureS12.pdf

Supplemental Material - FigureS13.pdf

Supplemental Material - FigureS14.pdf

Supplemental Material - FigureS15.pdf

Supplemental Material - FigureS16.pdf

Supplemental Material - FigureS2.pdf

Supplemental Material - FigureS3.pdf

Supplemental Material - FigureS4.pdf

Supplemental Material - FigureS5.pdf

Supplemental Material - FigureS6.pdf

Supplemental Material - FigureS7.pdf

Supplemental Material - FigureS8.pdf

Supplemental Material - FigureS9.pdf

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Additional details

Created:
August 22, 2023
Modified:
October 24, 2023