ALBAY PROVINCE OFFICIAL WEBSITE: PDCC Advisory

PHIVOLCS' MAYON DAILY BULLETIN
__________________________________________________________________________PHIVOLCS is lowering the alert level of Mayon Volcano form Alert Level 2 to Alert Level 1.

25 October 2006
4:00 P.M.

This is a notice for the lowering of Mayon's activity status from Alert Level 2 (evidence of magmatic intrusion that could eventually lead to an eruption) to Alert Level 1 (no hazardous eruption imminent).

After the alert status was lowered to Alert Level 2 last October 3, 2006. Mayon Volcano (13.2576oN, 123.6856oE) has consistently manifested the following:

1. The number of volcanic earthquakes recorded daily (1-3 per day) fell within the threshold level for Mayon of 5 volcanic earthquakes per day.
2. Volcanic tremors associated with magma movement within the volcano conduit as well as those related with the extrusion of lava from the active vent lava collapse and rockfalls became scarce and most of the time no record at all.
3. Ground deformation measurements showed a deflated volcano edifice indicating no fresh supply of magma from below.
4. The sulfur dioxide emission rate measured at 1,600 to 2,650 tonnes per day (t/d) is coherent with the post eruptive gas emission rate for Mayon Volcano; and
5. The observed crater glow was consistent in intensity (can be observed with the naked eye) but does not indicate any re-intensification of volcanic activity

The above observations suggest that the volcan's condition is improving and possibly heading towards normalcy. In view thereof, PHIVOLCS is lowering the alert level of Mayon Volcano form Alert Level 2 to Alert Level 1. This means that hazardous eruption is not likely to occur. The public however, is reminded that the 7-km Extended Danger Zone (EDZ) at the southeastern flank of the volcano and the 6-km radius Permanent Danger Zone (PDZ) at other areas remain off-limits due to the continuing threat from sudden small explosions, rockfalls from the upper slopes and secondary pyroclastic flows arising from the collapse of newly deposited lavas at the upper and middle slopes. Active river channels and those areas perennially identified as lahar prone in the southeast sector should also be avoided especially during bad weather conditions or when there is heavy and prolonged rainfall. [PHIVOLCS-DOST]

PREVIOUS BULLETIN

□ RELATED ARTICLES

□ DIRECTIVE FROM THE OFFICE OF THE GOVERNOR
□ PDCC Public/Tourism Advisory

□ MAYON DAMAGE REPORT

□ Mayon Volcano Lava Flow Pattern
□ SCENES FROM THE MAYON VOLCANO EVACUATION

□ LIST OF DONORS
:: Facts about the Mayon Volcano

MAYON VOLCANO PREVIOUS BULLETIN
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03 October 2006
4:00 P.M.

This is a notice for lowering of alert status for Mayon Volcano.

After Mayon Volcano's alert status was lowered to Level 3 on September 2006, a continuous decline in its overall activity was manifested. All monitored key parameter such as earthquake levels, ground deformation and gas outputs further declined. In addition, lava extrusion apparently ceased on 01 October 2006 as reported by Ligñon Observatory. The above observations indicate the absence of an intruding new mass or magma.

In summary, the persistent decline in all monitored parameters (seismic ground deformation, SO2 emission rate, visuals) and the apparent cessation of lava extrusions are indications that the volcano is relatively stable and slowly heading towards normal conditions.

In view of the constant downtrend in the overall activity of Mayon Volcano. PHIVOLCS is now lowering the volcano alert status from Alert Level 3 to Alert Level 2. This means, the probability of magmatic and hazardous eruption is now remote. PHIVOLCS, however, reminds the public not to enter the six (6) kilometer radius Permanent Danger Zone (PDZ) and the Extended Danger Zone (EDZ) which is the area in the southeast sector up to 7 kilometers from the summit crater due to the continuing threat from sudden explosions, rockfalls from the upper slopes and secondary pyroclastic flows arising from the collapsed of newly deposited lavas at the upper and middle slopes. [PHIVOLCS-DOST]

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MAYON VOLCANO PREVIOUS BULLETIN
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27 September 2006
8:00 A.M.

During the past 24-hours, Mayon Volcano’s (13.2576’N, 123.6856’E) seismic network recorded seven (7) volcanic earthquakes and eighteen (18) tremor episodes. Intermittent discharge of incandescent lava fragments and intense glow from the crater were still observed from the summit. Steaming from the crater was moderate with white plumes drifting southwest. Measurement of Sulfur Dioxide (SO2) emission rate was hampered due to heavy rains.

Mayon Volcano remains at a high level of unrest with fair probability for explosive eruptions. Alert Level 3 remains in effect, which means that the following zones should remain off-limits: the Extended Danger Zone (EDZ), which is the area in the southeast sector up to 7 kilometers from the summit crater, and for all the other areas around the volcano, the 6 kilometer-radius Permanent Danger Zone (PDZ). [PHIVOLCS-DOST]

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MAYON VOLCANO PREVIOUS BULLETIN
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25 September 2006
8:00 A.M.

Mayon Volcano’s (13.2576’N, 123.6856’E) seismic network detected fourteen (14) volcanic earthquakes and 114 tremor episodes during the past 24-hour observation period. A fair level of crater glow was observed and surface activity was characterized by intermittent extrusion of lava from the crater and rolling of incandescent lava fragments along the volcano’s slope, The Sulfur Dioxide (SO2) emission rate was at 1,300 tonnes/day which is still above normal levels.

Alert Level 3 remains in effect over Mayon Volcano, which means that the volcano is still at a high level of unrest. Ash explosions from the crater and secondary pyroclastic flows arising from the collapse of lava fragments may occur suddenly. PHIVOLCS reminds the public that the following zones should remain off-limits: the Extended Danger Zone (EDZ), which is the area in the southeast sector up to 7 kilometers from the summit crater, and for all the other areas around the volcano, the 6 kilometer-radius Permanent Danger Zone (PDZ). [PHIVOLCS-DOST]

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MAYON VOLCANO PREVIOUS BULLETIN
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23 September 2006
8:00 A.M.

For the past 24-hours, Mayon Volcano’s (13.2576’N, 123.6856’E) seismic network detected only one (1) volcanic earthquake, 14 tremor episodes and continuous occurrence of low frequency harmonic tremors. The Sulfur Dioxide emission rate of the volcanic plume was estimated to about 1,500 tonnes per day (t/d). Intermittent extrusion of incandescent lava from the crater was still observed. The decrease of tremor episodes signified the diminishing lava extrusion. Steaming from the crater was moderate with white plumes drifting west-northwest.

Alert Level 3 remains hoisted over Mayon Volcano, which means that the volcano is still at a high level of unrest. Ash explosions from the crater and secondary pyroclastic flows arising from the collapse of lava fragments may occur suddenly. PHIVOLCS reminds the public that the following zones should remain off-limits: the Extended Danger Zone (EDZ), which is the area in the southeast sector up to 7 kilometers from the summit crater, and for all the other areas around the volcano, the 6 kilometer-radius Permanent Danger Zone (PDZ). [PHIVOLCS-DOST]

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MAYON VOLCANO PREVIOUS BULLETIN
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21 September 2006
8:00 A.M.

Mayon Volcano’s (13.2576’N, 123.6856’E) seismic network detected 3 volcanic earthquakes, 20 tremor episodes and continuous occurrence of low frequency harmonic tremor during the past 24 hour observation period. The Sulfur Dioxide emission rate of the volcanic plume was measured at 2,200 tonnes per day (t/d) compared to 1,200 t/d recorded the other day. Intermittent discharge and tumbling down of incandescent lava fragments from the summit characterized on-going surface activity. Steaming was moderate with white plumes drifting east northeast.

Alert Level 3 remains hoisted over Mayon Volcano, which means that Mayon is still at a high level of unrest. Ash explosions and secondary pyroclastic flows arising from the collapse of lava fragments may occur suddenly. PHIVOLCS reminds the public that the following zones should remain off-limits: the Extended Danger Zone, which is the area in the southeast sector up to 7 kilometers from the summit crater, and for all other areas around the volcano, the 6 kilometer-radius Permanent Danger Zone. [PHIVOLCS-DOST]

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MAYON VOLCANO PREVIOUS BULLETIN
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20 September 2006
8:00 A.M.

For the past 24-hours, Mayon Volcano’s (13.2576’N, 123.6856’E) seismic network recorded one volcanic earthquake and 33 tremor episodes. Low frequency harmonic tremor continued to occur during the observation period. The Sulfur Dioxide emission rate of the volcanic plume was estimated at around 1200 tonnes/day as against yesterday’s 1,500 tonnes/day.

Surface activity was characterized by intermittent rolling of incandescent lava fragments and crater glow coming from the summit crater. Steaming activity from the volcano’s summit was moderate with white steam plumes drifting north-northeast and southeast.

The persistent occurrence of low frequency tremor still indicates elevated unrest of Mayon Volcano. Hence, Alert Level 3 remains in effect, which means that the new Extended Danger Zone (EDZ) of 7 kilometers from the summit crater covering the southeast sector and the normal 6 kilometer-radius Permanent Danger Zone (PDZ) for all other areas around the volcano should remain off-limits. [PHIVOLCS-DOST]

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MAYON VOLCANO PREVIOUS BULLETIN
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19 September 2006
8:00 A.M.

The seismic network around Mayon Volcano (13.2576’N, 123.6856’E) recorded 47 tremor episodes during the past 24 hours. The diminishing number of tremors is associated with the continuing decline in the perceived rate of lava extrusion from the summit crater. The Sulfur Dioxide emission rate of the volcanic plume remained at around 1500 tonnes/day. Steaming activity from the volcano’s summit was moderate with white steam plumes drifting southwest.

Alert Level 3 remains in effect over Mayon Volcano which means that the new Extended Danger Zone (EDZ) of 7 kilometers from the summit crater covering the southeast sector and the normal 6 kilometer-radius Permanent Danger Zone (PDZ) for all other areas around the volcano should remain off-limits. [PHIVOLCS-DOST]

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MAYON VOLCANO PREVIOUS BULLETIN
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18 September 2006
8:00 A.M.

A total of two (2) volcanic earthquakes were recorded at Mayon Volcano (13.2576’N, 123.6856’E) during the past 24-hour observation period. In addition, the seismic network commenced recording continuous occurrence of low frequency harmonic tremor with average trace double amplitude of 4.0 mm since 5:28 AM yesterday. Fifty-seven (57) tremor episodes relating to the extrusion of lava from the summit and rolling and tumbling of detaching lava blocks from the lava deposits at the upper slope were also detected. The Sulfur Dioxide emission rate was measured at 1,500 tonnes per day (t/d) reflecting a decrease from 1,800 t/d taken the other day. Steaming from the crater was moderate with white plume reaching heights of up to 300 m before drifting to the northeast.

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MAYON VOLCANO PREVIOUS BULLETIN
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16 September 2006
8:00 A.M.

Mayon Volcano’s (13.2576’N, 123.6856’E) seismic network detected 2 volcanic earthquakes, 31 tremor episodes and continuous occurrence of “low frequency harmonic tremor” during the past 24 hour observation period. The Sulfur Dioxide emission rate of the volcanic plume was lower at 1,400 tonnes per day (t/d) compared to 1,600 t/d recorded the other day. Intermittent discharge and tumbling down of incandescent lava fragments from the summit characterized on-going surface activity. Steaming was moderate with white plumes drifting southeast to northeast.

Alert Level 3 remains hoisted over Mayon Volcano, which means that Mayon is still at a high level of unrest. Sudden ash explosions and secondary pyroclastic flows arising from the collapse of lava fragments may occur suddenly without warning. PHIVOLCS reminds the public that the prevailing Extended Danger Zone (EDZ) encompassing the southeast sector is 7 kilometers from the summit crater, while the 6 kilometer-radius Permanent Danger Zone (PDZ) for all other areas around the volcano should likewise remain off-limits. [PHIVOLCS-DOST]

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MAYON VOLCANO PREVIOUS BULLETIN
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13 September 2006
8:00 A.M.

Eight (8) volcanic earthquakes and 108 tremor episodes were detected at Mayon Volcano (13.2576’N, 123.6856’E) during the past 24 hours. The decrease in the number of tremors is associated with the continuing decrease in the perceived rate of lava extrusion from the summit crater. The Sulfur Dioxide emission rate of the volcanic plume remained at around 1500 tonnes/day. Steaming activity from the volcano’s summit was moderate with white steam plumes drifting west-southwest to southwest.

PREVIOUS BULLETIN:
:: 11 September 2006 8:00 A.M
:: 10 September 2006 8:00 A.M
:: 08 September 2006 8:00 A.M
:: 07 September 2006 8:00 A.M
:: 06 September 2006 9:00 A.M
:: 05 September 2006 9:00 A.M
:: 04 September 2006 8:00 A.M
:: 03 September 2006 8:00 A.M
:: 01 September 2006 8:00 A.M
:: 30 August 2006 8:00 A.M
:: 29 August 2006 8:00 A.M
:: 28 August 2006 8:00 A.M
:: 27 August 2006 8:00 A.M
:: 25 August 2006 8:00 A.M
:: 24 August 2006 8:30 A.M
:: 23 August 2006 6:00 P.M
:: 22 August 2006 8:30 A.M
:: 21 August 2006 8:30 A.M
:: 20 August 2006 8:30 A.M
:: 19 August 2006 8:30 A.M
:: 18 August 2006 8:30 A.M
:: 17 August 2006 8:30 A.M
:: 16 August 2006 6:00 P.M
:: 16 August 2006 7:30 A.M

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MAYON VOLCANO PREVIOUS BULLETIN
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11 September 2006
8:00 A.M.

In the past 24 hours, there were some six (6) volcanic earthquakes and 206 tremor episodes detected. The Sulfur Dioxide emission rate from the crater was estimated to about 1,500 tonnes per day with plume drifts varying from northeast to east-northeast. Ground deformation measurements indicated an overall deflation of the edifice.

These observations generally show an elevated state of unrest, although there is an apparent decline of activity since late August. PHIVOLCS is presently undertaking an assessment on the possibility of lowering the alert status of Mayon and results of this evaluation shall be presented as soon as possible.

In the meantime, PHIVOLCS reminds the public to observe precautions attached with ALERT LEVEL 4. This means that the 8-kilometer radius EXTENDED DANGER ZONE (EDZ) for the southeast portion of the volcano should remain off-limits. At other areas, the EDZ is defined to be 7 kilometers from the summit. It is important to remain vigilant because even a small explosion, if caused by a brief outburst from the summit crater, could generate life-threatening pyroclastic flows. In the southeast, caution is alsao advised against approaching the still-hot lava deposits whose slopes remain unstable at this stage. [PHIVOLCS-DOST]

PREVIOUS BULLETIN:
:: 10 September 2006 8:00 A.M
:: 08 September 2006 8:00 A.M
:: 07 September 2006 8:00 A.M
:: 06 September 2006 9:00 A.M
:: 05 September 2006 9:00 A.M
:: 04 September 2006 8:00 A.M
:: 03 September 2006 8:00 A.M
:: 01 September 2006 8:00 A.M
:: 30 August 2006 8:00 A.M
:: 29 August 2006 8:00 A.M
:: 28 August 2006 8:00 A.M
:: 27 August 2006 8:00 A.M
:: 25 August 2006 8:00 A.M
:: 24 August 2006 8:30 A.M
:: 23 August 2006 6:00 P.M
:: 22 August 2006 8:30 A.M
:: 21 August 2006 8:30 A.M
:: 20 August 2006 8:30 A.M
:: 19 August 2006 8:30 A.M
:: 18 August 2006 8:30 A.M
:: 17 August 2006 8:30 A.M
:: 16 August 2006 6:00 P.M
:: 16 August 2006 7:30 A.M

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MAYON VOLCANO PREVIOUS BULLETIN
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10 September 2006
8:00 A.M.

Mayon Volcano,s seismic network detected four (4) volcanic earthquakes and 283 tremor episodes for the past 24 hours. The Sulfur Dioxide (SO2) emission rate was estimated at about 1,826 tonnes per day (t/d) yesterday from the previous 1,701 t/d.

Surface activity is now characterized by intermittent rolling down of glowing lava blocks at the southeast flank of the volcano. The lava blocks usually break up into several glowing fragments as they tumble downslope the Bonga-Mabinit channel. From time to time, lava fragments were seen rolling down the Miisi and Buyoan channels.

The foregoing observations indicate a continuing decline in the volcano's activity. Such a downtrend may soon allow for a lowering in the alert status of the volcano.

Meanwhile, ALERT LEVEL 4 remains in effect. This means that the 8-kilometer radius EXTENDED DANGER ZONE (EDZ) be observed by the public for the southeast portion of the volcano. At other areas, the EDZ is defined to be 7 kilometers from the summit. Residents and the public should remain vigilant because even a small explosion, if caused by a brief outburst from the summit crater, could generate life-threatening pyroclastic flows. In the southeast, caution is also advised against approaching the still-hot lava deposits whose slope remains unstable at this stage. [PHIVOLCS-DOST]

PREVIOUS BULLETIN:
:: 08 September 2006 8:00 A.M
:: 07 September 2006 8:00 A.M
:: 06 September 2006 9:00 A.M
:: 05 September 2006 9:00 A.M
:: 04 September 2006 8:00 A.M
:: 03 September 2006 8:00 A.M
:: 01 September 2006 8:00 A.M
:: 30 August 2006 8:00 A.M
:: 29 August 2006 8:00 A.M
:: 28 August 2006 8:00 A.M
:: 27 August 2006 8:00 A.M
:: 25 August 2006 8:00 A.M
:: 24 August 2006 8:30 A.M
:: 23 August 2006 6:00 P.M
:: 22 August 2006 8:30 A.M
:: 21 August 2006 8:30 A.M
:: 20 August 2006 8:30 A.M
:: 19 August 2006 8:30 A.M
:: 18 August 2006 8:30 A.M
:: 17 August 2006 8:30 A.M
:: 16 August 2006 6:00 P.M
:: 16 August 2006 7:30 A.M

[ Back ]

MAYON VOLCANO PREVIOUS BULLETIN
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08 September 2006
8:00 A.M.

In the past 24 hours, some twenty six (26) volcanic earthquakes and 333 tremor episodes were detected. The Sulfur Dioxide emission rate from the crater was estimated at 1,841 tonnes per day with plume drifts varying from northwest to northeast. Continuing ground deformation measurements indicated an overall deflation of the edifice.

The foregoing observations generally show an elevated state of unrest, although a few parameters, such as the state of ground swelling and absence of explosions in the past days, may indicate a slowdown in activity. PHIVOLCS is presently undertaking an assessment on the possibility of lowering the alert status of Mayon and results of this evaluation shall be presented as soon as possible.

In the meantime, PHIVOLCS maintains ALERT LEVEL 4, which means that the 8-kilometer radius EXTENDED DANGER ZONE (EDZ) be observed by the public for the southeast portion of the volcano. At other areas, the EDZ is defined to be 7 kilometers from the summit. It is important to remain vigilant because even a small explosion, if caused by a brief outburst from the summit crater, could generate life-threatening pyroclastic flows. In the southeast, caution is also advised against approaching the still-hot lava deposits whose slope remains unstable at this stage. [PHIVOLCS-DOST]

PREVIOUS BULLETIN:
:: 07 September 2006 8:00 A.M
:: 06 September 2006 9:00 A.M
:: 05 September 2006 9:00 A.M
:: 04 September 2006 8:00 A.M
:: 03 September 2006 8:00 A.M
:: 01 September 2006 8:00 A.M
:: 30 August 2006 8:00 A.M
:: 29 August 2006 8:00 A.M
:: 28 August 2006 8:00 A.M
:: 27 August 2006 8:00 A.M
:: 25 August 2006 8:00 A.M
:: 24 August 2006 8:30 A.M
:: 23 August 2006 6:00 P.M
:: 22 August 2006 8:30 A.M
:: 21 August 2006 8:30 A.M
:: 20 August 2006 8:30 A.M
:: 19 August 2006 8:30 A.M
:: 18 August 2006 8:30 A.M
:: 17 August 2006 8:30 A.M
:: 16 August 2006 6:00 P.M
:: 16 August 2006 7:30 A.M

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MAYON VOLCANO PREVIOUS BULLETIN
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07 September 2006
8:00 A.M.

For the past twentyfour hours, Mayon Volcano's seismic network detected ten (10) volcanic earthquakes and 315 tremor episodes. Ground deformation measurement showed general deflation of the volcanic edifice. This signifies a slowdown in magma ascent, which may also be indicated by apparent decrease in extrusion of lava fragments observed last night.

Steaming activity at the summit crater was most of the time moderate and drifted to the west and west-southwest.

In summary, seismic, ground deformation and other observed parameters indicate a further decline in activity. However, the probability of ash explosions and lava dome collapse remains high. Hence, ALERT LEVEL 4 remains hoisted over the volcano, which means that the 8-kilometer radius EXTENDED DANGER ZONE (EDZ) over the southeast should be off-limits. For other areas around the volcano, the presently enforced EDZ is 7 kilometers from the summit. PHIVOLCS is continuously assessing activity and if downward trends are evident in the coming days, then the appropriate recommendation for lowering the alert status shall be made. [PHIVOLCS-DOST]

PREVIOUS BULLETIN:
:: 06 September 2006 9:00 A.M
:: 05 September 2006 9:00 A.M
:: 04 September 2006 8:00 A.M
:: 03 September 2006 8:00 A.M
:: 01 September 2006 8:00 A.M
:: 30 August 2006 8:00 A.M
:: 29 August 2006 8:00 A.M
:: 28 August 2006 8:00 A.M
:: 27 August 2006 8:00 A.M
:: 25 August 2006 8:00 A.M
:: 24 August 2006 8:30 A.M
:: 23 August 2006 6:00 P.M
:: 22 August 2006 8:30 A.M
:: 21 August 2006 8:30 A.M
:: 20 August 2006 8:30 A.M
:: 19 August 2006 8:30 A.M
:: 18 August 2006 8:30 A.M
:: 17 August 2006 8:30 A.M
:: 16 August 2006 6:00 P.M
:: 16 August 2006 7:30 A.M

[ Back ]

MAYON VOLCANO PREVIOUS BULLETIN
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06 September 2006
8:00 A.M.

Mayon Volcano's (13.2576˚N, 123.6856˚E) seismic network detected thirteen (13) volcanic earthquakes and 295 tremor episodes during the past 24 hours. The Sulfur Dioxide (SO₂) flux of the volcanic plume was measured at 2,032 tonnes per day (t/d). Steam emission from the summit varied from weak to moderate and arrived to the west and west-southwest as observed during the cloud breaks yesterday and early this morning.

Lava continued to ooze out of Mayon's summit crater but the rate and volume of lava extrusion apparently decreased as observed during the past three days. the extruded lava blocks typically break inot several fragments as these tumble downslopes the southeast flanks. Occassionally, lavas from the crater spill towards the Miisi channel.

A decrease in the observed activity and lack in acceleration of events at Mayon has become evident from the obtained by the various monitoring networks. This means a reduction on the likehood of a major hazardous eruption. However the probability of ash explosions and lava dome collapse is still high. Hence, Alert Level 4 remains hoisted over the volcano, which means that the 8-kilometer radius Extended Danger Zone (EDZ) over the southeast should be off-limits. For other areas around the volcano, the presently enforced EDZ is 7 kilometers from the summit. PHIVOLCS is continuously assessing activity and if downward trends are evident in the coming days then the appropriate recommendation shall be made. [PHIVOLCS-DOST]

PREVIOUS BULLETIN:
:: 05 September 2006 9:00 A.M
:: 04 September 2006 8:00 A.M
:: 03 September 2006 8:00 A.M
:: 01 September 2006 8:00 A.M
:: 30 August 2006 8:00 A.M
:: 29 August 2006 8:00 A.M
:: 28 August 2006 8:00 A.M
:: 27 August 2006 8:00 A.M
:: 25 August 2006 8:00 A.M
:: 24 August 2006 8:30 A.M
:: 23 August 2006 6:00 P.M
:: 22 August 2006 8:30 A.M
:: 21 August 2006 8:30 A.M
:: 20 August 2006 8:30 A.M
:: 19 August 2006 8:30 A.M
:: 18 August 2006 8:30 A.M
:: 17 August 2006 8:30 A.M
:: 16 August 2006 6:00 P.M
:: 16 August 2006 7:30 A.M

[ Back ]

MAYON VOLCANO PREVIOUS BULLETIN
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05 September 2006
9:00 A.M.

In the past 24 hours, Mayon Volcano's (13.2576˚N, 123.6856˚E) activity was dominated by continuous lava extrusion and spilling of lava fragments, which resulted in 455 tremor episodes. The main and presently active lava flow continues to override the Mabinit lava flow deposit, which was implaced last July and early August.

No volcanic earthquake was detected during the past observation period. The Sulfur Dioxide (SO₂) flux of the volcanic plume also decreased to 1,447 tonnes per day (t/d) yesterday from the other day's 2,961 t/d. Weak to moderate volume of white to dirty-white steam clouds drifted west-southwest yesterday and early this morning at between 700-800 meters elevation, portions of the front or toe of this lava flow splits and sheds lava fragments towards the general direction of Buyoan channel.

The continuing lava flow and rockfall activity cause considerable threat to lowland areas in the southeast flanks of the volcano. Potential hazards are pyroclastic flows which could be sourced from lava accumulation in the summit crater and upper slopes. Hence, PHIVOLCS maintains Alert Level 4 over the volcano. This means that the 8-kilometer radius Extended Danger Zone (EDZ) in the southeast should be strictly off-limits. For other areas around the volcano, the presently enforced EDZ is 7 kilometers from the summit. [PHIVOLCS-DOST]

PREVIOUS BULLETIN:
:: 04 September 2006 8:00 A.M
:: 03 September 2006 8:00 A.M
:: 01 September 2006 8:00 A.M
:: 30 August 2006 8:00 A.M
:: 29 August 2006 8:00 A.M
:: 28 August 2006 8:00 A.M
:: 27 August 2006 8:00 A.M
:: 25 August 2006 8:00 A.M
:: 24 August 2006 8:30 A.M
:: 23 August 2006 6:00 P.M
:: 22 August 2006 8:30 A.M
:: 21 August 2006 8:30 A.M
:: 20 August 2006 8:30 A.M
:: 19 August 2006 8:30 A.M
:: 18 August 2006 8:30 A.M
:: 17 August 2006 8:30 A.M
:: 16 August 2006 6:00 P.M
:: 16 August 2006 7:30 A.M

[ Back ]

MAYON VOLCANO PREVIOUS BULLETIN
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04 September 2006
8:00 A.M.

Lava continued to ooze out of Mayon's summit crater (13.2576N,123.6856E), which resulted in 305 tremor episodes for the past 24 hours. Lavas and the detaching lava blocks continously cascaded towards the southeast sector of the volcano. Majority of the extruded lavas were observed overriding the Mabinit lava flow deposit and the rest were seen rolling down the MIISI and Buyoan channels. Eleven (11) volcanic earthquakes were also detected. These signify magma ascent and its degassing activity.

The Sulfur Dioxide (SO2) flux of the volcanic plume slightly increased to 2,961 tonnes per day (t/d) yesterday from the other day's 2,021 t/d. Moderate volume of white to dirty-white steam column was observed drifting west-southwest yesterday afternoon and early this morning.

The parameters still indicate a high level of unrest for Mayon Volcano. Hence, PHIVOLCS maintains ALERT LEVEL 4 over the volcano. This means that the 8-kilometer radius EXTENDED DANGER ZONE (EDZ) in the southeast should be strictly off-limits. For other areas around the volcano, the presently enforced EDZ is 7 kilometers from the summit. [PHIVOLCS-DOST]

PREVIOUS BULLETIN:
:: 03 September 2006 8:00 A.M
:: 01 September 2006 8:00 A.M
:: 30 August 2006 8:00 A.M
:: 29 August 2006 8:00 A.M
:: 28 August 2006 8:00 A.M
:: 27 August 2006 8:00 A.M
:: 25 August 2006 8:00 A.M
:: 24 August 2006 8:30 A.M
:: 23 August 2006 6:00 P.M
:: 22 August 2006 8:30 A.M
:: 21 August 2006 8:30 A.M
:: 20 August 2006 8:30 A.M
:: 19 August 2006 8:30 A.M
:: 18 August 2006 8:30 A.M
:: 17 August 2006 8:30 A.M
:: 16 August 2006 6:00 P.M
:: 16 August 2006 7:30 A.M

[ Back ]

MAYON VOLCANO PREVIOUS BULLETIN
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03 September 2006
8:00 A.M.

Mayon Volcano's activity apparently declined for the past 24 hours. Nine (9) volcanic earthquakes were detected compared with yesterday's 31. The Sulfur Dioxide (SO2) emission rate also decreased to 2,021 tonnes per day (t/d) yesterday from the other day's 6,585 (t/d). However, the tremor episodes remained high, indicating continous flow of glowing lavas and the detaching lava blocks from the main lava flow. These activities were observed rolling and cascading towards the southeast sector of the volcano. Clear views of the crater yesterday afternoon and early this morning disclosed moderate to voluminous volume of dirty white steam column that drifted east-northeast and west-northwest.

The sudden changes in the volcano's activity like the decrease in the number of recorded volcanic earthquakes and SO2 flux may happen from time to time and does not indicate that Mayon's activity is on the decline. Hence, the probability of explosions are high. In summary, ALERT LEVEL 4 remains hoisted over the volcano. This means that the 8-kilometer radius EXTENDED DANGER ZONE (EDZ) over the southeast should be strictly off-limits. For other areas around the volcano, the presently enforced EDZ is 7 kilometers from the summit. [PHIVOLCS-DOST]

PREVIOUS BULLETIN:
:: 01 September 2006 8:00 A.M
:: 30 August 2006 8:00 A.M
:: 29 August 2006 8:00 A.M
:: 28 August 2006 8:00 A.M
:: 27 August 2006 8:00 A.M
:: 25 August 2006 8:00 A.M
:: 24 August 2006 8:30 A.M
:: 23 August 2006 6:00 P.M
:: 22 August 2006 8:30 A.M
:: 21 August 2006 8:30 A.M
:: 20 August 2006 8:30 A.M
:: 19 August 2006 8:30 A.M
:: 18 August 2006 8:30 A.M
:: 17 August 2006 8:30 A.M
:: 16 August 2006 6:00 P.M
:: 16 August 2006 7:30 A.M

[ Back ]

MAYON VOLCANO PREVIOUS BULLETIN
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