Hendrasto explained that this phenomenon is triggered by the rising of magma to the surface (Jonggring Seloka crater). Due to pressure from the magma to the surface, it often causes lava fall towards Besuk Bang and Besuk Kembar, two lava flow areas of Semeru Mountain. This is what causes the increase in earthquake eruptions of up to four times the ratio on September compared to August.
However, Hendrasto said that only small eruptions had occur in September and this eruption was recorded by a seismograph device in the Semeru Mountain Observation Post in Sawur Mountain, Sumberwuluh Village, Lumajang District.
Based on the monthly report data relating to volcanic mountain activities with a height of 3,676 meters above sea level, there have been 65 earthquake eruptions along August. In September, 260 eruptions have were recorded.
Head of Semeru Mountain Observation Post in Sawur Mountain, Suparno, said that based on visual and seismic observation, the activity of Semeru is stil on alert level. He advised that residents living in the area of Besuk Bang River Flow, Besuk Kembar and Besuk Kobokan should be on alert to hot clouds that could happen at any time.
“Lava dome in Jonggring Seloka crate is seen to be full,” Suparno said in a written statement for the Vulcanology and Mitigation Geological Disasters Center.
The Lava dome can experience in landslide and hot clouds falling could occur at any time, which is very dangerous to mankind. “If there is a strong pressure coming from the inside, very hot material burst could occur which endanger hikers,” Suparno said.
Source : Tempo
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