I. SITUATION OVERVIEW
A. Chronological of Events and Eruption Notifications from 13 January to 06 March 2018 (TAB A)
B. Current Situation
07 March 2018
Mayon’s activity in the past 24 hours was characterized by brief periods of weak lava fountaining, gravity-driven lava flow and subsequent quiescence. Two (2) episodes of weak lava fountaining at 08:28 AM and 02:40 PM lasted for two (2) hours and consisted of fifteen (15) and six (6) discrete events, respectively. These events generated dark gray ash plumes that rose 100 to 300 meters above the summit crater before drifting southwest and were accompanied by rumbling sounds audible beyond 10 kilometers of the summit crater. At night, lava flows were observed to continue moving downslope within 3.3 kilometers, 4.5 kilometers and 1.9 kilometers from the crater on the Mi-isi, Bonga and Basud Gullies, respectively.
A total of seventy-six (76) volcanic earthquakes and thirteen (13) rockfall events were recorded by Mayon's seismic monitoring network. Sulfur dioxide (SO2) emission was measured at an average of 4,459 tonnes/day on 06 March 2018. Deflation of the lower slopes that began on 20 February is still being recorded by electronic tilt and by Precise Levelling (PL) surveys.
Nonetheless, overall ground deformation data indicate that the edifice is still swollen or inflated relative to pre-eruption baselines.
A. Pre-Emptive Evacuation (TAB B)
- A total of 16,380 families were pre-emptively evacuated in Region V due to Mt. Mayon phreatic eruption.
Source: DILG SitRep No. 04 as of 24 January 2018
B. Affected Population
As of 6:00 PM, 06 March 2018, a total of 23,705 families / 90,742 persons were affected in 61 barangays in the municipalities/cities of Bacacay, Camalig, Guinobatan, Ligao City, Daraga, Tabaco City, Malilipot, Santo Domingo (Libog), and Legazpi City in the Province of Albay (Region V).
Currently, a total of 17,308 families or 66,486 persons were served inside and outside evacuation centers (ECs):
Inside 58 ECs: 15,715 families / 60,431 persons
Outside ECs: 1,593 families / 6,055 persons