Smithsonian Institution Global Volcanism Network Bulletin v. 20, no. 10, October 1995 Merapi (Indonesia) Pyroclastic flows travel down two river drainages Merapi Java, Indonesia 7.54S, 110.44E; summit elev. 2,911 m During August-October 1995 pyroclastic flows (~glowing avalanches~) continued flowing down the Boyong River; others entered the Krasak River and reached ~1-1.5 km from the source. Seismic activity was dominated by multiphase and lava-avalanche (rockfall) earthquakes. The number of multiphase earthquakes increased in October to 793 events, compared to 186 in September. Earthquakes associated with lava avalanches or rock falls gradually decreased from 1,195 events in August to 806 in September and 605 in October (figure 4). Shallow volcanic (B-type) earthquakes (~1 km depth) were recorded on 25 October and a deep volcanic (A- type) earthquake (2.7 km depth) was detected on 30 October. Observations in October indicated an inflation associated with 40 ~rad of tilt. Measurement of SO2 by COSPEC indicated that the emission rate during October fluctuated between 18 and 112 tons/day (average 63). Merapi is one of the most active volcanoes in Indonesia. The stratovolcano has an exposed, summit lava dome, the source of abundant glowing avalanches directed down its S to W slopes toward a region settled by at least 50,000 people. In historical time, instability of the growing dome has led to pyroclastic flows that have caused many fatalities. Collapse of the growing lava dome in November 1994 triggered pyroclastic flows that killed 64 people (Bulletin v. 19, nos. 10 and 12). Additional collapses continued into January 1995 (Bulletin v. 20, no. 2). Information Contact: Wimpy S. Tjetjep (Director), Volcanological Survey of Indonesia (VSI), Jalan Diponegoro 57, Bandung, Indonesia.