Answer :
On average - 20 years the Puget sound region experience moderate to large earthquakes. this is called the recurrence interval (t) for moderate to large earthquakes.
A sound in the Pacific Northwest, Puget Sound is also an inlet to the Pacific Ocean and a portion of the Salish Sea. It is situated along the Washington state's northwest coast in the United States. There are three links to the open Pacific Ocean via the Strait of Juan de Fuca, one major and two small. The major connections are Admiralty Inlet and Deception Pass, and the lesser connections are Swinomish Channel and Deception Pass. Approximately 2% of the entire tidal exchange between Puget Sound and the Strait of Juan de Fuca passes through Deception Pass. The Puget Sound stretches from Deception Pass in the north to Olympia in the south for about 100 miles (160 km). Its highest depth, off Jefferson Point between Indianola and Kingston, is 930 feet, with an average depth of 450 feet (140 meters) (280 m). Between Whidbey Island's southernmost point and Tacoma, the major basin is around 600 feet deep (180 m). The United States Board on Geographic Names designated the area around Puget Sound, the Strait of Juan de Fuca, and the Strait of Georgia as the Salish Sea in 2009. In addition to Puget Sound itself, words like "Puget Sound" and "Puget Sound and surrounding waters" are occasionally used to refer to waters to the north, including Bellingham Bay and the San Juan Islands region.
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