NDRRMC Update SitRep No. 55 re Mayon Volcano Eruption as of 8:00 AM (05 March 2018)

Situation Report
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A. Chronological of Events and Eruption Notifications from 13 January to: 03 March 2018 (TAB A)

B. Current Situation

05 March 2018

Mayon's activity in the past 24 hours was characterized by general quiescence, gravity-driven lava flow and degrassing from the summit crater. Two (2) events between 12:42 PM and 3:23 PM that lasted 3-4 minutes generated ash plumes that rose 250 meters above the summit crater before drifting southwest. 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, espectively.

A total of forty-four (44) volcanic earthquakes and fifty-three (53) rockfall events were recorded by Mayon's seismic monitoring network. Sulfur dioxide (S02) emission was measured at an average of 1,403 tonnes/day on 2 March 2018. Deflation of the lower slopes that began on 2 February is still being recorded by electronic tilt. Nonetheless, overall electronic tilt and continuous GPS data indicate that the edifice is still swollen or inflated relative to November and October 2017, consistent with campaign Precise Levelling data acquired last week.