The term geologists use to describe when bedrock tilts in the same direction of the slope is called adverse bedding and is a major cause for mass wasting events such as landslides. The Portuguese Bend Landslide is a combination of an earthflow, rotational and translational slide.
What caused the Portuguese Bend landslide?
The primary problem in Portuguese Bend is the lack of drainage in Portuguese Canyon, which cuts across the landslide area.
What strategy stabilized the Portuguese Bend landslide?
What strategy stabilized the Portuguese Bend landslide? Water drainage.
What kind of geologic structure is the Palos Verdes Peninsula?
As described in the Rancho Palos Verdes General Plan Natural Environment Element, the Palos Verdes Peninsula is underlain by a sequence of middle Miocene and younger bedded sedimentary rocks that are draped anticlinally over a core of Mesozoic schist “basement rocks.” Both the schist and sedimentary rocks have been …
What was most likely responsible for the slow slide of the Portuguese Bend on the Palos Verdes Peninsula?
Another possible contributing cause of the sliding was the construction of hundreds of homes on and above the unstable rock and soil in the early 1950s prior to the slide. Each home had its own sewage treatment facility (cesspool or septic system) and home owners established lawns and gardens on their properties.
What was the Portuguese Bend?
The Portuguese Bend landslide, in coastal southern California, is an active, slow-moving mass of blocks and debris that extends from the shoreline to moderate altitudes along part of the southerly margin of the Palos Verdes Hills.
Who owns Portuguese Bend?
The owners include Luis and Brenda Navarro, who co-own two Lola’s Mexican Cuisine locations and The Social List in Long Beach, with Simon Haxton, a master distiller who has a degree in aerospace engineering, and Jim Leatherman and Josh Johnson, founders of the Long Beach-based Broken Homme Footwear and the clothing …
Why are landslides more common on steep slopes?
A landslide occurs because the force of gravity becomes greater than either friction or the internal strength of the rock, soil, or sediment. … Pushing the rock is easier if the surface slopes downhill or is slippery. The same is true for landslides—steeper slopes have less friction, making landslides more common.
Is it possible that the 1956 Portuguese Bend landslide was triggered entirely by natural causes?
Is it possible that the 1956 Portuguese Bend Landslide was triggered entirely by natural causes? Yes, it is possible that the 1956 Portuguese Bend landslide was triggered entirely by natural causes. This is because the area has been known historically to be very susceptible to landslides.
Why is Palos Verdes so prone to mass wasting?
The rock layers along this side of Palos Verdes Peninsula often dip at an angle that is nearly the same as the slope of the hillsides. This orientation is referred to as dip-slope and has contributed to mass rock movements probably as long as PVP has been rising out of the sea.
Is Palos Verdes on bedrock?
Most of the geological reports I have had the pleasure to read state the majority of homes on the Palos Verdes Peninsula are built on bedrock. Not only is it one of the most beautiful regions in Southern California it is also one of the most stable, geologically speaking.