The Philippine Institute of Volcanology and Seismology or PHIVOLCS does not rule out the possibility of a stronger than 4.2 and 4.3 magnitude earthquake in Camarines Sur Province
It is not intimidation or alarm, but preparation.
“MAGNITUDE 7.4 – 8 IN 1907”
Mr. Alanis, Senior Science Research Specialist of DOST-PHIVOCS- Bicol, said that there was an estimated 7.4 Magnitude earthquake in November 1907.
In the re-measurement, according to Alanis, reached Magnitude 8 was felt.
In short, PHIVOLCS does not rule out the possibility of a stronger earthquake because it has happened before, especially since the Bicol Region is Tectonically Active.
There is a fault line in Camarines Sur and Masbate that is also connected to other fault lines in the country.
PHIVOLCS had earlier said they did not see any magma movement under the two volcanoes in Camarines Sur.
The two “inactive” volcanoes in Camarines Sur are Mount Isarog near Naga City and Mount Asog near Iriga City
According to Alanis, LGUs should be prepared to respond to the earthquake.
The first strong quake or 4.3 Magnitude was recorded in Oct. 14, 2021, then followed by aftershocks, turning into Earthquake Swarm in PHIVOLCS terminology or sequential earthquakes for several hours and days, while 4.2 Magnitude was on Oct 17, and October 22 night which was also followed by aftershocks.