|Mayon Volcano Bulletin 30|
|Tuesday, 12 January 2010 10:28|
Six (6) volcanic earthquakes and seventeen (17) rockfall events related to the detachment of lava fragments at the volcano’s upper slopes were detected by Mayon Volcano’s (13.2576 N, 123.6856 E) seismic monitoring network during the past 24 hours. Weak to moderate emission of white steam at the summit crater was seen during cloud breaks yesterday and early this morning. Pale crater glow was still observed last night. Yesterday’s measurement of Sulfur Dioxide (SO2) emission rate yielded an average of 820 tons/day. Results of ground deformation measurements at Buang and Lidong precise leveling lines showed deflationary trend compared to 02 December 2009 survey.
Alert Level 3 is still in effect over Mayon Volcano. PHIVOLCS-DOST reminds the public that that the 6-km radius Permanent Danger Zone and the 7-km Extended Danger Zone on the southeast flank of the volcano should be free from human activity because of sudden explosions that may generate hazardous volcanic flows. People residing close to these danger areas are also advised to observe precautions associated with post-eruption activity, such as rockfalls, pyroclastic flows, and ash fallout which can also occur anytime due to instabilities of lava deposited on steep slopes. Active river channels and those perennially identified as lahar prone in the southern sector should also be avoided especially during bad weather conditions or when there is heavy and prolonged rainfall. Civil aviation authorities must advise pilots to avoid flying close to the volcano’s summit as ejected ash and volcanic fragments from sudden explosions may pose hazards to aircrafts. PHIVOLCS-DOST is closely monitoring Mayon Volcano’s activity and any new significant development will be immediately posted to all concerned.