GrauGeist
Generalfeldmarschall zur Luftschiff Abteilung
Earthquakes and Volcanoes are a real thing in California and it is (or at least used to be) taught here in school.I admire that you know so well the forces you must be prepared to content with, living where you live ... the fires and live geology .... more people should make honest appraisal of where they live ....
As it happens, the two are connected by plate tectonics - in Southern and Central California, earthquakes are caused by plate movement (usually centered half a mile to one and a half miles deep), however, here in Northern California, many earthquakes are caused by volcanism (centered five to twenty miles deep) and there is a huge difference between how the two types of quakes feel:
Plate slippage = swaying and/or rolling with no warning sound.
Volcanism = sort of sharp vibration with a distinct train-like rumbling sound heard 15/20 seconds before the quake hits.