![]() ![]() On 30 August the Alert Level was raised to 2 (on a scale of 1-4). Seismicity started to increase in April and continued to increase through August. In August dense white plumes rose 20 m above the caldera rim. Ground-based observers at an observation post in Tambora village noted dense white plumes rising 50-75 m above the caldera rim during April and June, but no plumes during May or July. On 8 September the Alert Level was raised to 3 (on a scale of 1-4).Ģ4 August-30 August 2011 Cite this Reportīased on visual observation and seismic data, CVGHM reported an increase in activity at Tambora during the previous five months. Diffuse white plumes were observed on 5 September and rose 10 m above the crater rim. During 30 August-8 September seismicity continued to increase. Therefore, on 30 August, the Alert Level was raised to 2 (on a scale of 1-4). Based on visual observations, deformation data, and seismicity, the Alert Level was lowered to 2 (on a scale of 1-4) on 9 October.ħ September-13 September 2011 Cite this Reportīased on visual observation and seismic data, CVGHM reported an increase in activity at Tambora that started in April. On 9 April the Alert Level was lowered to 1 (on a scale of 1-4).ġ2 October-18 October 2011 Cite this ReportĬVGHM reported that during 22 September-9 October plumes did not rise from Tambora seismicity fluctuated, but declined overall. Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)ĬVGHM reported that during January-8 April plumes did not rise from Tambora, no changes were observed around the caldera, and seismicity decreased. Diponegoro 57, Bandung, West Java, Indonesia, 40 122 (URL: ).īased on visual observations and seismic data, CVGHM raised the Alert Level for Tambora to 2 (on a scale of 1-4) on 5 April. Information Contacts: Center for Volcanology and Geological Hazard Mitigation (CVGHM), Jl. Wilford, J.N., 2006, Under an 1815 Volcano Eruption, Remains of a 'Lost Kingdom', the New York Times, URL: Posted 28 February 2006 accessed 26 September 2011. Pyroclastic flows, lava flows, toxic gases, incandescent bombs, and heavy ash fall. Pyroclastic flows, lava flows, toxic gases, incandescent bombs, ash fall, lahars/mudflows, and high acidity in water. Lahars, ash fall, and incandescent bombs. Summary of Disaster Prone Areas at Tambora defined on the basis of radial distance from the peak of Tambora. As of 21 September, the Alert Level remained at 3. The Disaster Prone Areas were largely based on the devastating 1815 eruption of Tambora. On 8 September, CVGHM raised the Alert Level to 3, invoked a 3 km exclusion zone, and prohibited access to Disaster Prone Areas III, summarized in table 2. Instruments recorded 40 volcanic earthquakes on 7 September (table 1) 32 of those were recorded within 6 hours. On 5 September an earthquake was felt by residents (exact location undisclosed). DateĪlong with the continuation of the tremor after 29 August, CVGHM reported an increase in other types of seismic activity from 30 August to 7 September. On both 29 August and 5 September seismicity was accompanied by plumes rising 10-20 m above the caldera rim. ![]() Summary of seismicity at Tambora since the onset of volcanic tremor on 29 August 2011. Based on seismic activity and visual observations, CVGHM raised the Alert Level to 2 (on a scale from 1 to 4) on 30 August, and forbade access to the peak of Tambora. The tremor was accompanied by diffuse plumes rising 10-20 m above the caldera rim on 29 August and 5 September. Volcanic tremor started 29 August and continued every day since, with the exception of 3 September (table 1). Onset of continuous volcanic tremor on 29 August is not represented. Reported seismic activity at Tambora cumulative by month from April through August 2011. ![]()
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