Slamet

Volcano number:263180
Region:Indonesia
Country:Java
Geodetic measurements?Yes
Deformation observation?Yes
Measurement method(s):InSAR
Duration of observation:06/2006-06/2009; 01/2007-12/2008
Inferred cause of deformation:Magmatic
Characteristics of deformation:

While neither study was focused on this volcano, Slamet was included in both the 2006-2009 ALOS study of West Sunda, and the 2007-2008 PALSAR interferometric study of the island of Java performed by Chaussard & Amelung and Philibosian & Simons, respectively.

Both surveys noted significant deformation at the volcano during the study periods; over the three years of observation, Chaussard & Amelung recorded a total uplift of 12.2cm at the volcanic edifice, at the relatively constant rate of 6.8cm/yr. However, the rate of deformation tapered significantly between early-mid June 2009, during which time Slamet experienced a series of small explosive eruptions.

Philibosian & Simons’ results corroborate these observations, though their measurement of net uplift at the volcano is slightly smaller than that of Chaussard & Amelung – approximately 5cm of displacement over the two year period (2007-2008), at a greatly reduced rate of 3cm/yr.

Both studies agree that the deformation at Slamet was magmatic in origin, and almost certainly linked to the 2009 eruptions. Philibosian & Simons estimate that their observed deformation signals are most accurately modelled by an injection of magma into a shallow source of approximately 1.5km depth, amounting to a volume increase of 5 × 105 m3.

Reference:Chaussard, E. and Amelung, F. 2012. Precursory inflation of shallow magma reservoirs at west Sunda volcanoes detected by InSAR. Geophysical Research Letters, 39 (12)
Reference:Philibosian, B. and Simons, M. 2011. A survey of volcanic deformation on Java using ALOS PALSAR interferometric time series. Geochemistry, Geophysics, Geosystems, 12 (11). DOI: 10.1029/2011GC003775
Location:109.208, -7.242

Photo by Igan Supriatna, 1990 (Volcanological Survey of Indonesia)

Analysis of Slamet volcano deformation, July 2008-November 2009. From Philibosian & Simons, 2011.