Cal. Ins. Code § 530.5

If a loss or damage results from a combination of perils, one of which is a landslide, mudslide, mudflow, or debris flow, coverage shall be provided if an insured peril is the efficient proximate cause of the loss or damage and coverage would otherwise be provided for the insured peril. Coverage shall be provided under the same terms and conditions as would be provided for the insured peril.