2. Strain in the major fault zones of southern California. The effect of that sudden shift depends on the type of fault the movement occurs in.
The San Andreas Fault—made infamous by the 1906 San Francisco earthquake—is a strike-slip fault. The M=6.4 Ridgecrest earthquake likely imparted a Coulomb stress increase of up to about 1 bar to the nearby Garlock Fault. In the case of the Garlock Fault, this means that the terrain north of the fault is moving westward relative to the terrain south of the fault, which is moving relatively eastward. Most conspicuous of the faults displaying left-lateral slip is the Garlock fault which intersects the San Andreas fault at about lat 35° N. and extends northeastward and eastward from there for 240 km (fig. Two large mountain ranges are visible, the San Gabriel Mountains … Tens of miles of lateral movement have probably occurred on these faults with the possibility of a cumulative movement on the San Andreas … And despite San Francisco’s legendary 1906 earthquake, the San Andreas Fault does not go through the city. It begins in the Tejon Pass and travels north east for about 300 miles. The Garlock Fault is the second largest fault line in California, behind the San Andreas Fault. A broad scale strain feature throughout Southern California south of the Garlock fault. The central Garlock section extends from the left-releasing step-over near Koehn Lake eastward to the Quail Mountains where the Owl Lake fault [70] intersects the Garlock fault zone. The Hayward fault in the San Francisco Bay area runs through a densely-populated area, so it has been studied quite a bit.The most recent major earthquake on this fault was approximately M6.9 and occurred in 1868. The western Garlock fault section extends from the complex intersection with the San Andreas fault [1g] near Frazier Park east-northeast to a 3-km-wide left-releasing step-over in the vicinity of Koehn Lake. In concert, the faults have defined a primary strain pattern of relative east-west extension and north-south shortening of the area of 120,000 square miles. There are also some potentially important lesser faults such as the San Gabriel and Cucamonga Faults.
The While presently more active than the San Andreas fault, the San Jacinto fault is much younger in age, having slipped laterally only about 15 miles, compared to nearly 200 miles of displacement along the San Andreas fault.
1. But communities like Desert Hot Springs, San Bernardino, Wrightwood, Palmdale, Gorman, Frazier Park, Daly City, Point Reyes Station and Bodega Bay lie squarely on the fault … The Garlock Fault is a northeast to east trending, left-lateral strike slip fault that is bounded by the San Andreas Fault on the west, and the Death Valley Fault on the east. Its 260 km length separates the rugged terrain of the Tehachapi-Sierra Nevada and Basin and Range Regions to its
Below the Garlock Fault is highlighted in red. It may even have the potential to spur "The Big One", a release of the enormous San Andreas Fault running through the heart of California. The central segment extends from …
McGill and Sieh (1991) divide the Garlock fault into western, central and eastern segments. The southernmost tip of the San Andreas fault has traditionally crept in response to distant quakes, including the magnitude 8.2 quake off the coast of … The fault has been creeping about 4.6 mm/yr (0.2 inches/yr) for the last several decades, but that is only half of the long-term slip rate, so stress is building upon this fault.
In neither region is there any obvious local anomaly of the kind expected from dissipative heating on the … 1.3; see maps at front of book). Scientists found that it has slipped 0.8 inch (or about 2 centimeters) near its surface since July.
There are three main types of faults, based on how adjacent blocks of rock move relative to each other. CENTRAL SECTION OF THE SAN ANDREAS FAULT SYSTEM. On the west side of the San Andreas fault, the southwest- and east-west-trending Big Pine fault joins the San Andreas fault a few kilometers northwest of the point where the … It thus includes both the seismogenic, predominantly locked segments of the northern San Andreas fault system, which has several active strands, and the central ˜160-km long creeping segment of the San Andreas, where nearly all of the motion currently occurs as aseismic slip on a single fault. Activity The Garlock moves at a rate of between 2 and 11 millimeter s a year , with an average slip of around 7 millimeters.