Phivolcs records 11 more Taal harmonic tremors
Phivolcs recorded 11 more harmonic tremors from Taal Volcano on Feb 6.
The number of volcanic earthquakes decreased to 132 compared to the previous day's 156.
Harmonic tremors often precede or accompany eruptions, according to USGS.
Since Feb 4, Phivolcs has recorded a total of 21 harmonic tremors in less than a week.
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