mount semeru last eruption

... Volcan Semeru big eruption null. Based on this, PVMBG lowered the Alert Level to II on 2 May 2012. About 1/3 of the explosions threw blocks well above the N crater rim and some fell on the pyroclastic cone. Semeru, the highest volcano on Java, and one of its most active, lies at the southern end of a volcanic massif extending north to the Tengger caldera. In beginning of September lava was extruded and formed lava stream in direction of river Sarat (S slope) accompanied by continuous tremors (recorded by mechanical seismographs at Tawonsongo Observatory 1-15 September, and at Argosuko Observatory 2-4 September). on 21 April. Strombolian-type eruptions have accompanied the formation of the lava dome since extrusion began in 1967.Lava avalanches from the dome have usually been contained at about 3 km altitude on the S flank of the volcano, in the upper reaches of the Kembar River, but one traveled farther down the river valley in early December. Seismicity was dominated by explosions and avalanche earthquakes.Semeru, the highest peak on Java, has frequent pyroclastic flows, lahars, and lava flows. Common activity has consisted of ash plumes, pyroclastic flows and avalanches, and lava flows that travel down the SE flank. At other times it continued for more than 3 minutes with >100 puffs. Lava blocks traveled 300 m from the ends of lava flows in the Kembar drainage. Mount Semeru Eruption Semeru Volcano East Java erupted since at 1818, at least 55 eruptions have been recorded (10 of which resulted in fatalities) Semeru has been in a state of near-constant eruption from 1967 to the present. Despite the imposing look, Mount Semeru has three beautiful mountain lakes, 2 nearby the last … Seven incandescent avalanches from a lava-flow front traveled at most 300 m down the flank. and drifted over 25 km SW. Based on analysis of satellite images, the Darwin VAAC reported that on 25 and 27 May ash plumes from Semeru rose to an altitude of 4.3 km (14,000 ft) a.s.l. Lava extruded from the crater over the S rim formed a 750-m-long lobe moving down the S flank toward the Kembar river.Eruptive activity on 3 February 1994 produced ashfalls, lava avalanches, and pyroclastic flows, destroying a village and killing 6 people (19:01). Seismographs also recorded 2-3 daily avalanches of material off the lava flow erupted 17 February. The average time between explosions was ~22 minutes, but varied between 3 and 46 minutes.One phase of activity that could not be correlated with the release of steam from any particular fumarole was a rhythmic, puffing sound emitted from the bottom of the crater. Maximum eruption cloud height was ~1 km above the summit.. . The Alert Level remained at 2 (on a scale of 1-4), and the public was reminded to stay outside of the general 1-km radius from the summit and 4 km on the SSE flank.PVMBG reported that the eruption at Semeru continued during 4-10 May. The Alert Level remained at 2 (on a scale of 1-4) and the public was reminded not to approach the crater within a 4-km radius.PVMBG reported that during 1 March-27 April white-and-gray plumes rose 100-400 m above Semeru’s Jongring Seloko crater and drifted W; during April eight “eruption” plumes rose 300-500 m. On 26 April at 1852 and 1934, and on 27 April at 0500, incandescent rockslides from the lava dome traveled as far as 300 m down the S flank. Summit topography is complicated by the shifting of craters from NW to SE. The frequency of explosions decreased steadily from 3,832 in May (125/day) to 1,797 in December (60/day).

Based on analysis of satellite imagery and information from PVMBG, the Darwin VAAC reported that during 13-14 February ash plumes from Semeru rose to altitudes of 6.7-7.9 km (22,000-26,000 ft) a.s.l. In August of 1994, explosions were occurring at intervals of 15-20 minutes. The plume reached a height of ~4.3 km a.s.l. An ash plume was reported by the Darwin VAAC in October 2013 and a thermal alert pixel appeared on 29 November 2013. Based on information from the Center of Volcanology and Geological Hazard Mitigation (CVGHM formerly DVGHM), the Darwin VAAC reported that "ash rain" from Semeru was reported near the volcano.

Seismicity included 670 explosion events.