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.    Read the article…………………………….