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All Journal Indonesian Journal of Physics (IJP)
Muhamad Hendrasto
Center for Volcanology and Geological Hazard Mitigation, Geological Agency, Jl. Diponegoro 57, Bandung 40122, Indonesia
Astronomy Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering

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Automatic and Real-time Processing of Tilt Records for Prediction of Explosions at Semeru Volcano, East Java, Indonesia Hery Kuswandarto; Muhamad Hendrasto; Masato Iguchi
Indonesian Journal of Physics Vol 19 No 3 (2008): Vol. 19 No. 3, July 2008
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (218.005 KB) | DOI: 10.5614/itb.ijp.2008.19.3.2

Abstract

Eruptive activity of Semeru Volcano, East Java, Indonesia, is characterized by intermittent occurrence of strombolian and vulcanian types in intervals of 15 – 45 minutes. The explosive eruptions accompany explosion earthquakes and tilt changes of ground around the summit crater. Prior to the explosions (16 – 300 s before), gradual upward tilts of the crater side were detected with amounts of 0.3 – 20 nrad. The upward tilts turned to downward after start of explosive eruptions and tilt decreased by 0.7 – 50 nrad for 30 – 70 s. In order to detect the precursory tilt changes in real time automatically by using the tilt record, software coded by Visual Basic was developed. The software receives UDP packet data from A/D converter for the tiltmeter and shows the record on PC display. The software judge stages of volcanic activity (pre-eruption or eruption) based on the tilt change. In a test, 72% of increase in tilts prior to explosions was successfully detected.
Co-Authors Hery Kuswandarto Masato Iguchi