There’s little doubt in local seismologists’ minds that the numerous tremors recorded in the Puget Sound region over the past several days are related to a phenomenon that some say increases the risk of a major earthquake. Just how much the event increases the risk of a mega-quake is up for debate, but one thing is for sure, the tremors are spreading. “Just over a week with strong tremor[s] every day and spreading mostly north,” the Pacific Northwest Seismic Network wrote on its blog. About every 14 months, the Cascadia Subduction Zone that stretches from Northern Vancouver Island to Cape...