![]() After the 1983 phreatic activity, the tilt rate decreased by about a factor of five. From 1981 to 1983, the average tilt rate at the edges of the summit craters was 40–50 microradians per year. Measurements made in the summit region indicated uplift since the start of these measurements through at least 1986. Tilt measurements, using a spirit-level technique, have been made every few months since February 1981 in the summit region and along the south and east flanks of the volcano. More recently, increased hydrothermal and earthquake activity occurred from late 1985 through 1986. ![]() In late 1983, several small phreatic explosions originated from one of the summit craters. The last magmatic eruption occurred in 1910. About a dozen eruptions-mostly phreatic events- and 15 other periods of unrest, indicated by earthquakes or increased thermal activity, have been noted since 1829. ![]() ![]() All historical eruptive activity at this volcano has been confined to a complex of explosive summit craters. Tangkuban Parahu is an active stratovolcano located 17 km north of the city of Bandung in the province west Java, Indonesia.
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