What happens to "newly created land" depends on local legislation. Where I live (Finland) this is a common question, because it happens all the time. We're stil

What happens to "newly created land" depends on local legislation. Where I live (Finland) this is a common question, because it happens all the time. We're still recovering from the depression of ground, caused by latest Ice Age. In Western Finland and Eastern Sweden, the land rises at about 1 cm per year, thus claiming area from the sea. 1 cm per year may not sound like a lot, but in shallow waters, it means that entire coastal towns become inland towns over the course of 100 years. Harbours have to be relocated, etc. Kilometres of new land is claimed from the sea over the course of centuries (and within a couple of millenia, the Gulf of Bothnia will dry up in places and create a land connection across, assuming water level rise caused by global climate change does not slow it down too much). Over here, the law works so that the newly created land at the shore becomes property of the owner of the water area (fishing) rights which is a "commonwealth" of local land owners, but the owner of the particular piece of land formerly adjacent to the sea or lake has the pre-emptive right to purchase the area and attach it to his/her property, at a "fair" price i.e. price comparable to the price of his/her own property. So in effect you have to remember to buy regularly (every few decades) the new land between your plot and the water. But that was Finland. How does this work regarding land created or lost in earthquakes in California? Let's assume that the fault line of tectonic plates happens to run through your plot, the plates push at each other and then in an earthquake run over each other, and the corner points of your plot move closer to each other. Is that just your loss? I.e. your plot became smaller? And likewise, if the borders of your plot move away from each other in an earthquake, your property expands, possibly impacting e.g. how large buildings can be constructed according to zoning regulations?