Possibly related:

Vancouver Island area rumbling, residents fearful:
[link to theextinctionprotocol.wordpress.com]

Could be dissociating methane hydrates there. Here's a map of hydrate deposits around the world:

[link to tinypic.com]

See that cluster of hydrate deposits near the Cascadia area? Could be those are melting now, in which case the gas will blow mostly eastward toward the Pacific Northwest. Watch for more incidents of mass sickening like the 100+ who sickened at the Harbour Hotel in Vancouver a few days ago, or maybe buildings exploding and/or catching fire and possibly collapsing, as happened in the last day to multiple buildings in Rio de Janeiro.