southernmost strand of the SF, once past Green Mountain, turns southwest, towards the Saddle Mountain and Frigid Creek faults. However, the Saddle Mountain fault zone is not quite reciprocally aligned, trending more northerly to where it encounters west–east trending faults (including the Hamma Hamma fault zone) that appear to be a westward extension of the Seattle Fault zone. This trend extends further north where the Pleasant Harbor lineament appears to terminate other westward extensions of the SFZ. Other studies have faults extending NW or WNW from the SF towards Dabob Bay; these are now recognized as part of the Dabob Bay fault zone. While some coherency is developing, the story is not complete: identified faults do not yet account for much of the region's seismicity. An emerging view is that the Dewatto fault marks the western edge of the relatively rigid Seattle Uplift (see map). Accommodation of strain (displacement) between the Seattle Fault and the Saddle Mountain deformation zone is likely distributed across the more pliable sediments of the Dewatto Basin; this, and the greater depth to the Crescent Formation, may account for the subdued expression of the Seattle Fault west of Green Mountain. USGS QFFDB Fault #570, Seattle Fault Tacoma Fault Zone The Tacoma Fault (at right, and also between lines C and D on the Uplift and basin map, above) just north of the city of Tacoma, Washington has been described as "one of the most striking geophysical anomalies in the Puget Lowland". The western part is an active east–west striking north dipping reverse fault that separates the Seattle Uplift and the Tacoma Basin, with approximately 30 miles (50 km) of identified surface rupture. It is believed capable of generating earthquakes of at least magnitude 7, and there is evidence of such a quake approximately 1,000 years ago, possibly the same earthquake documented on the Seattle Fault 24 miles (38 km) to the north. This is likely not coincidental, as it appears that the Tacoma and Seattle faults converge at depth (see diagram above) in a way that north–south compression tends to force the Seattle Uplift up, resulting in dip-slip movement on both fault zones. The Tacoma Fault was first identified by as a gravitational anomaly ("structure K") running east across the northern tip of Case and Carr Inlets, then southeast under Commencement Bay and towards the town of Puyallup. Not until 2001 was it identified as a