28 Dec New pyroclastic cone forms and collapses
New pyroclastic cone forms and collapses
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The number of earthquakes recorded and felt by the population reduce
Renewed phreatomagmatic and strombolian activity
Since the last statement, a total of 77 earthquakes have been located in the area, 5 of them felt by the population. 76 of these earthquakes are located at depths of 9-18 km and only one at a depth of around 30 km. The maximum recorded magnitude is 4.2 (mbLg) during yesterday’s earthquake at 21:11 UTC, with a depth of 11 km and an intensity of V. The amplitude of the tremor signal is kept at low levels. The island’s network of permanent GNSS stations shows a vertical elevation increase of about 6 cm at station LP03, which is the closest to the eruptive centres. LP01, a GNSS station located further from the eruptive centres than LP03 continues to register slight deflation. Using a calibrated image IGN estimated at 08:30 UTC, an ash cloud height of 1,900 masl and a scattering cloud in the south-southwest direction. The height of the cone is measured obtaining a value of 1.125 masl. Persistent strombolian activity has been observed on the north east flank since December 1st (IGN, 2021). Yesterday, on the 2nd of December lava fountains rose 400-500 m above the North East flank vent, forming a new pyroclastic cone which collapsed and were transported downslope by lava flows which impacted Tacande highway. A new fissure opened on the South East flank of the main cone which produced Strombolian activity and fast-moving lava flows that traveled South West (GVP, 2022).
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