How Many Volcanoes in the Philippines?

How Many Volcanoes are there in the Philippines?

This question keeps coming up in conversations so I did the research on Philippine volcanoes and found the following facts:

Active Philippine volcanoes = 22 volcanoes

Last significant eruption = Mount Mayon volcano, Albay province, Jun. 24-Jul. 26, 2001

Philippine volcano with the most recorded eruptions = Mount Mayon volcano, 48 recorded eruptions

Potentially active Philippine volcanoes = 27 volcanoes

Inactive Philippine volcanoes = 358 volcanoes

However, ' Inactive ' is only a relative term: the strikingly isolated Mount Arayat, in Pampanga province, not more that 50km from Mount Pinatubo, is on the ' Inactive Volcano ' list and Mount Arayat showed signs of coming back into life when Mount Pinatubo blew its top in July 1992.

For more information about volcanoes, and volcanoes in the Philippines, try the PhilVolcs website http://www.phivolcs.dost.gov.ph/

Alitaptap

What volcano in California is acting like it might soon create a caldera? I remember my geology professor mentioning it last semester, but I cannot remember which volcano it is. Thanks!