Bromo , Indonésia : the activity level of Bromo is reduced from level III (SIAGA) to level II (waspada).

Bromo , Indonésia : the activity level of Bromo is reduced from level III (SIAGA) to level II (waspada).

During the period from February 18 to 25, 2016, it was recorded 6 eruptions earthquake and episodes of constant tremor with maximum amplitude ranges from 1 to 24 mm. From the date of February 22, 2016, the seismic tremor was recorded continuously with a maximum magnitude of 0.5 to 2 mm, eruptions earthquake were not recorded.

Deformation.
The deformation monitoring of Bromo uses the method of EDM (electronic distance measurement) and inclinometer. The EDM method consists of three monitoring points and on 8 February 2016, it was created permanent checkpoints: G. Kursi, Bromo and Mount Batok, allowing measurement despite the frequent fog around Mount Bromo.
The deformation measurements, tilt and EDM shows fluctuations and a stable trend.

EVALUATION
The visual activity not could be clearly determined, the Bromo being enveloped in fog. The issuance of thick white gray smoke with a high column of 50 to 900 meters high with a change in direction between the North-East and West-Southwest was noted. No rumblings over the last five days have been recorded.
The recording of the seismicity is dominated by a constant tremor with a maximum amplitude which fluctuated in the range of 1 to 30 mm and dated on February 22, 2016, the dominant maximum amplitude of the tremor was 0.5 to 2 mm . No earthquake eruption was recorded.
Measurements of deformation with tilt and EDM shows fluctuations but a stable trend.

CONCLUSIONS:

Seismic activity is dominated by constants Tremor vibration with an amplitude in decrease and lack of eruption earthquakes. The threat of an eruption in the form of emission of ash and emission of material that could happen to a radius of 1 km remains. Based on observational data and analysis of seismic data, visual, and the potential danger of eruption, the activity level of Bromo is reduced from level III (SIAGA) to level II (waspada) on February 26 2016.
The activity level of Bromo will be raised / lowered if an increase / decrease in activity was found by volcanic experts of Center for Volcanology and Geological mitigation .

April 05, 2016.Bromo , Indonésia :

Source : VSI

Photos : PVMBG

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