They’re really working one particular area over. About a 100 miles west of San Diego. From another article about this here are the following aircraft involved-
“Navy EP-3E Aries II, which is used for electronic surveillance, a Navy P-3C Orion, which is used for submarine spotting, and a Boeing P-8 Poseidon used for anti-submarine warfare.”
Earlier launch of missile launch from Chinese sub off California coast.
http://www.wnd.com/2010/11/230425/