Who would be held liable for damages in the event of a retaining wall failure between 2 properties in California?

Our house shares a relatively small retaining wall with the neighbor's property along our driveway. At the sidewalk where it starts, the wall is level with the ground then increases in height to about 4-5' at its tallest down our sloped driveway. The neighbor's house is roughly 6-7' away from the edge of the wall and sits higher than our house.

There's a section in the middle of the wall that has been cracked for ages and juts out about 1.5". I'm concerned it might be getting worse and want to have it inspected and hopefully repaired (if possible).

From what I've researched, it appears ownership of the wall should be split between both property owners. Here's my concern, let's say it rains really hard and the wall fails. Our side would likely only be left with concrete and dirt to clean up without any major damage. However, the neighbor's home could be structurally in danger. Is there a chance they could try to come after us for those damages saying we are partially liable? Or would the extent of our liability end at the cost of splitting the repairs to the wall?

submitted by /u/invertedspheres
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source https://www.reddit.com/r/RealEstate/comments/1kba05o/who_would_be_held_liable_for_damages_in_the_event/