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The default extent of a geostatistical layer is the rectangular extent of the input points. If you want to change the extent, right-click the layer in ArcMap's table of contents, and choose "Properties". Go to the Extent tab, and you can define a different extent (like the extent of California).
For more information about changing the extent and clipping a geostatistical layer, see the link below. Skip down to steps 12-20 in the section titled "Create a surface using the default options."
If you have any further questions about geostatistics, you'll get the quickest response by using the Geostatistical Analyst Forum:
Good luck, and I hope this helped.