The Philippine Institute of Volcanology and Seismology (Phivolcs) has monitored a continuous tremor-like series of weak volcanic earthquakes which caused "abrupt and sustained increase" in seismic energy release in Mayon Volcano.&nbsp;
In an advisory posted on Tuesday afternoon, Phivolcs said the weak volcanic earthquakes lasted for 11 seconds and it recurred every 5 seconds.&nbsp;&nbsp;
&ldquo;This resulted in an abrupt and sustained increase in the level of seismic energy release beginning 03 July 2023,&rdquo; it said.&nbsp;
Alongside is the increase in sulfur dioxide emission that averaged 1,558 tonnes on Tuesday alone.
&ldquo;This current phase of unrest is likely driven by magmatic gas activity within the edifice,&rdquo; Phivolcs noted.&nbsp;
The state seismologist said the dome-collapse pyroclastic density currents (PDCs) have flowed down the eastern Basud Gully and southern Mi-si Gully within a distance of 1 to 2 kilometers from the Mayon Volcano&rsquo;s crater for about two minutes.&nbsp;
Phivolcs said trace ashfall from the PDCs was reportedly experienced by residents of Guinobatan Municipal and Ligao City.
&ldquo;DOST-PHIVOLCS reiterates that Alert Level 3 (increased tendency towards a hazardous eruption) still currently prevails over Mayon Volcano, but that the increase in seismic energy release is being closely monitored,&rdquo; it said.&nbsp;
The state seismologist strongly recommended that residents living within a six-kilometer permanent danger zone (PDZ) remain in evacuation centers while those within the seven and eight-kilometer radius be prepared to vacate their homes once the PDC activity worsens.&nbsp;
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Phivolcs: Continuous volcanic quake causes increase activity in Mayon Volcano