in the number of tectonic earthquakes that began 18 August 2004. Tremor registered on 23, 24, 25, and 26 September 2004. Tremor amplitudes ranged between 12 and 13.5 mm, and the duration of the tremor stood between 94 and 290 seconds. At 05:30 on 1 October 2004 Rinjani erupted. The eruption caused authorities to immediately raise the hazard status to Alert Level 3 (Orange). Details regarding the initial 1 October 2004 eruption are indistinct. During 2–5 October 2004 explosions sent ash columns above the summit. Gray, thick ash columns drifted to the north and detonation sounds accompanied every explosion. Successive explosions occurred at intervals of 5 to 160 minutes. Explosions vented on the north eastern slope of Barujari volcano. Some material also vented from Barujari's peak and fell down around its edifice. A press report in the Jakarta Post indicated that evacuations were not considered necessary. A Volcanic Explosivity Index (VEI):2 rating was issued for the activity between 1 May 2004 through to (on or after) 5 October 2004. Activity since 2009 2009 On 27 April 2009 Gunung Barujari became active, with activity continuing through to May 2009. The mountain was closed at that time as the eruptions intensified with plumes of smoke and ash as high as . A Volcanic Explosivity Index (VEI):2 rating was issued for the activity between 2 May 2009 and 20 December 2009. The activity during this period was described as having the characteristics of central vent eruption, flank (excentric) vent, explosive eruption and lava flow(s). 2010 Rinjani erupted three times on 22 May 2010 with activity continuing until early on 23 May. According to the volcano's official monitoring agency, ash from Mount Rinjani was reported as rising up to two kilometers into the atmosphere and damaged crops. The volcano did not threaten villagers at that time. Lava flowed into the caldera lake, pushing its temperature up from , while smoke spread . In February 2010 observers at the Gunung Rinjani Observation Post located northeast of G. Rinjani saw one whitish-colored plume that rose from the volcano. Dense whitish plumes (and possibly brown) rose in March 2010 on 26 occasions and as high as in April 2010 on 41 occasions. Plumes seen on 1 and 2 May 2010 were "chocolate" in color and rose a maximum height of . From February 2010 through April 2010 seismicity decreased, although the maximum amplitude of earthquakes increased. CVGHM