In the angle between these is located the minor Lincoln Creek uplift, the Doty Hills, and, further west, an impressive chunk of Crescent basalt. KUOW is the Puget Sound region’s #1 radio station for news. This boundary would be the contact where northward movement of the basement rock of the Puget Lowland against the Olympic Peninsula is accommodated; it would be expected to be a significant seismological zone. The database also contains the locations of mapped ultra-mafic rocks that may potentially contain asbestos and a radon hazard map. And Atwater discovered something else. These landslides are compiled from existing geologic maps. It has been suggested that a corresponding change in the character of the SWIF may reflect a change in the direction of regional crustal strain. Simply put, the basement rock on the west side of Puget Sound does not match the basement rock on the east side. Yet the former is only the first of at least six more parallel southeast striking faults, which do cross the Salzer Creek Fault. The mapped surface traces are only 5 km long, but LIDAR-derived imagery shows longer lineaments, with the traces cutting Holocene alluvial traces. [171] Such quakes pose a serious threat to the City of Tacoma's dams at Lake Cushman,[172] located in the fault zone,[173] and to everyone downstream on the Skokomish River. This map also shows the tsunami inundation zone for the area. While these models vary in some details, both indicate that the Seattle Fault itself is capable of a magnitude 7.5 earthquake. Doubts on the connectivity of these faults led to abandonment of this name in 1986[66] when Cheney mapped the Mount Vernon fault (MVF) from near Sultan northwest past Lummi Island (west side of Bellingham Bay, visible at the top of the map), crossing the Devils Mountain Fault (DMF, part of the Darrington—Devils Mountain Fault Zone) near Mount Vernon. There are some interesting relationships here. [108] Although there is no direct evidence for any major north-striking faults under Seattle, this prospect appears to be endorsed by the geological community.[109]. This new view is particularly important for Seattle, which sits atop a sedimentary basin that strongly affects the patterns of earthquake ground shaking and therefore, of potential damage. [145] It arises from the contrast between the denser and more magnetic basalt of the Crescent Formation that has been uplifted to the east, and the glacial sediments that have filled the Dewatto basin to the west. The lowest exposed strata of Tiger Mountain, the mid-Eocene marine sediments of the Raging River formation, may be correlative with the SWCC. By the 1990s, a new consensus had formed. [130], An emerging view is that the Dewatto fault marks the western edge of the relatively rigid Seattle Uplift (see map). These features suggest that the southern Puget Lowland is influenced by the deep crust and even the subducting Juan de Fuca plate, but the details and implications are not yet known. [27] This "basement" rock is covered with sedimentary deposits similar to the Chuckanut Formation, and more recent (typically Miocene) volcanic deposits. However, areas of artificial fill and young alluvium (soft soils), as indicated by the locations with highest hazard in these maps, have elevated levels of hazard for a variety of building types, including single-family houses. It may also be the original location of the Darrington—Devils Mountain Fault (the dashed line "X" at the top of the following map). [204] This anticline, or uplifted fold, and the narrower width of the northern part of the SWCC, reflects an episode of compression of this formation. [107] Other seismic tomography has tantalizingly suggested three north-striking strands under Seattle, and a fourth just east of Lake Washington. While there is a short zone (not shown) of fainter seismicity near Goat Rocks (an old Pliocene volcano[203]) that may be associated with the contact, the substantially stronger seismicity of the WRZ is associated with the major Carbon River—Skate Mountain anticline. And in between these two the Strawberry Point Fault (SPF) skirts the south side of Ault Field, splits into various strands that bracket Strawberry Point, and then disappear (possibly ending) under the delta of the Skagit River. Whether the faulting continues eastward is not yet determined. They can be greater than magnitude 9 with shaking that lasts for minutes rather than seconds. Geologists from the Washington Geological Survey map and characterize faults throughout the state every year. [45] The Leech River Fault has been identified as the northern edge of the Crescent Formation (aka Metchosin Formation, part of the Siletzia terrane that underlies much of western Washington and Oregon). Also, the sedimentary Chuckanut Formation (part of the NWCS, green) north of the DMF correlates to the Suak and Roslyn Formations just north of Manastash Ridge. Reports and Maps This map shows all completed tsunami inundation maps for Washington. The USGS has produced a new series of earthquake hazard maps for the City of Seattle.

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