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The State of California Department of Conservation produces regulatory maps showing locations where the hazard from earthquake-triggered landslides must be evaluated prior to specific types of land-use development in accordance with provisions of Public Resources Code, Section 2690 et seq. (Seismic Hazards Mapping Act). These maps and related ...
The Seismic Hazards Mapping Act, passed in 1990, addresses non-surface fault rupture earthquake hazards, including liquefaction and seismically induced landslides. The act only applies to faults which are "sufficiently active" and "well defined"- for example the 1994 Northridge earthquake occurred on a blind thrust fault not zoned by the act ...
Where the buried shapes of older landslides are complicated, depositing infill material in one area can trigger a new landslide. When planning this type of work the stepping effect of the cuts and infill should be taken into account: their beneficial influence on the increase in safety factor will be reduced in relationship to the size of the ...
An ancient complex of landslides under the Portuguese Bend Reserve, located within the larger Palos Verdes Nature Preserve, was activated in 1956, which halted all housing development in the area.
Rancho Palos Verdes, a coastal community in the Los Angeles area, could be described as a geological ticking time bomb. The affluent city sits atop steep cliffs overlooking the Pacific Ocean that ...
A state of emergency was declared in the city of Rancho Palos Verdes on Tuesday a day after more homes lost power because of the shifting land.. Gov. Gavin Newsom’s proclamation of a state of ...
The landslide area spanned approximately 90 acres [38] and damaged and destroyed several homes. [3] Impacted homeowners received roughly $16 million in compensatory setttlements. [38] In 1987, there was a documented landslide in the Flying Triangle area above Portuguese Bend. [29]
In the last few weeks, Southern California Gas Co. shut off service to 135 homes in the landslide area, citing safety concerns from the worsening land movement.