The northern and older branch curves eastward in the range interior. A basement boundary between gneissoid rocks of San Gabriel Mountains aspect and Peninsular Ranges rocks strikes east across the basin and connects with the San Jose fault. We take the Old Ridge Route over the Liebre Mountains to Quail Lake. Magnetic polarity stratigraphy dates deposition of the overlying Saugus Formation to between 2.6 Ma and 0.78 Ma. The San Gabriel fault is ~3 km west of both dams, and is an ~80-km long structure. [Robert H Paschall; Henry Walrond] The San Gabriel Fault Zone cuts both units.

These are not the default projection or datum for most GPS receivers but are the standard for older USGS Topo maps.

The right lateral San Gabriel Fault Zone in southern California extends from the northwestern corner of the Ridge Basin southeastward to the eastern end of the San Gabriel Mountains.

The velocity structure above and below this interface strongly suggests it is the Vincent thrust fault: intermediate velocities (6.2 …

This field trip begins at Lloyd’s Restaurant at the junction of Highways 210 and 2 in La Canada California. Its movement created the Ridge Basin. Article navigation. The right lateral San Gabriel Fault Zone in southern California extends from the northwestern corner of the Ridge Basin southeastward to the eastern end of the San Gabriel Mountains. This boundary may represent the eastward continuation of the Canton fault, a middle Miocene precursor of the San Gabriel fault system with up to 30 km of right slip. The San Gabriel Basin is a Pliocene-Pleistocene Transverse Ranges structure bounded by the San Gabriel Mountains on the north, the San Jose and Puente Hills on the east, and the Repetto and Montebello Hills on the west.

at the San Gabriel fault (an old branch of the San Andreas fault), and terminates in the south at i to 2 km depth at the southern mountain front. From 13 million years ago until 4 million years ago, everything south of the San Gabriel fault slid, earthquake by earthquake, a total of about 40 km (24 miles) to the northwest. The northern and older branch curves eastward in the range interior. The mud pots near the Salton Sea are a result of its action, but your best bet to see the Southern San Andreas Fault … It's a Other size geocache, with difficulty of 3.5, terrain of 3. It bifurcates to the southeast in the northwestern San Gabriel Mountains.

The San Gabriel fault is ~3 km west of both dams, and is an ~80-km long structure.