After the explosive eruption of June 21, 2020, the internal seismicity - VA, Shallow Volcanic (VB) and Multi-Phase (MP) of Merapi began to increase.
There was a shortening of the base distance EDM (Electronic Distance Measurement) in the Northwest Babadan-RB1 sector (hereinafter abbreviated EDM Babadan) by 4 cm shortly after the explosive eruption of June 21, 2020. After that, the Distance shortening continued at a rate of approximately 3mm / day until September 2020.
Since October 2020, the seismicity has intensified. Babadan's EDM shortening rate reached 11 cm / day Based on a drone observation on November 3, 2020, no new lava dome has yet been seen
Under these conditions, it is possible to have a rapid extrusion of magma or an explosive eruption.
Potential hazards in the form of lava avalanches, ejection of material and hot clouds / pyroclastic flows over a distance of up to 5 km
In this context, the activity status of Mount Merapi has been increased from Waspada (level II) to Siaga (level III) as of November 5, 2020 at 12:00 WIB.
It is recommended to stop mining in the river channels that originate at Mount Merapi in KRB III.
Tourists should not engage in tourist activities at KRB III G. Merapi, including climbing activities to the top of Mount Merapi.
Sources: PVMBG, Magma Indonesia, BPPTKG
Live Volcano Merapi by VolcanoYT 05.11.2020
In Sinabung, the activity does not weaken and the pyroclastic flows become daily and longer.
On November 4, the observation post at Simpang Empat reported a pyroclastic flow over 1,000 meters to the southeast at 8:26 a.m. WIB, followed by another at 12:11 WIB.
VAAC Darwin issued an ash scattering advisory at 1:56 p.m. Z, with an aviation code orange.
On November 5, a pyroclastic flow traveled 2,000 meters east-south-east; its trace is of an amplitude of 120 mm during 164 sec.
Sources: PVMBG, Magma Indonesia, VAAC Darwin and Beidar Sinabung