JAKARTA - Observations of the seismicity noted that the flood vibration on Mount Semeru in Lumajang Regency, East Java was recorded as a seismograph for 3,600 seconds or 1 hour due to heavy rains that flushed the top of the mountain which had an altitude of 3,676 meters above sea level (masl) on Sunday.
Officers of the Mount Semeru Observation Post Yadi Yuliandi in his written report stated that during the observation period on Sunday at 12.00-18.00 WIB there was a flood earthquake.
"One earthquake was recorded with a flood earthquake with an amplitude of 13 mm and an earthquake of 3,600 seconds," he said at the Mount Semeru Observation Post on Mount Sawur, Lumajang Regency, quoted by Antara.
In addition to flood vibrations, seismograph also recorded that the activity of Mount Semeru occurred 20 earthquakes with an amplitude of 10-22 mm and an earthquake of 74-123 seconds, then two distant tectonic earthquakes with an amplitude of 21 mm.
" Visually, Mount Semeru is clearly visible until it is covered in fog 0-III. The crater smoke is not observed. The weather is cloudy to the rain, the wind is weak to the north and south," he said.
Mount Semeru, which is located on the border of Lumajang Regency with Malang, is still at Level III or its status is Alert, so people are advised to comply with the recommendations of the Center for Volcanology and Geological Disaster Mitigation (PVMBG).
He explained that people are prohibited from carrying out any activities in the southeast sector along Besuk Kobokan as far as 13 km from the summit (the center of the eruption).
Beyond that distance, the community is also not allowed to carry out activities at a distance of 500 meters from the riverbank (river border) along Besuk Kobokan because it has the potential to be affected by the expansion of hot clouds and lava flows up to a distance of 17 km from the summit.
"People on the slopes of Semeru are also advised not to move within a 5 km radius of the crater/peak of Mount Semeru because they are prone to the danger of throwing stones (pijar)," he said.
In addition, the public is also advised to be aware of the potential for Hot Clouds to Fall (APG), lava avalanches, and lahars along rivers/valleys that originate at the peak of the Semeru Volcano.
"Especially as long as Besuk Kobokan, Besuk Bang, Besuk Kembar, and Besuk Sat and the potential for lahars in small rivers which are tributaries of Besuk Kobokan," he said.
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