New drilling in Rancho Palos Verdes has revealed that devastating land movement has been caused, at least partially, by a deeper slip plane — meaning a larger area could be affected.
The forces behind the relentless land movement plaguing Rancho Palos Verdes appear to be more complicated, and possibly more widespread, than originally thought — forcing the city to once again rethink how it can limit some the mounting damage. Officials confirmed a very deep and active landslide plane — previously considered dormant — during exploratory drilling this summer, a discovery that has upended emergency efforts aimed at stabilizing the Portuguese Bend area.
Other mapping does not include those areas, however, and Phipps noted that recent movement, or other factors, could have shifted the ancient perimeter. His team recently installed additional monitoring sites in the neighborhoods south of Crest Road, hoping to better understand the scope of current and potential movement.
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