But, no need to fear.
Following the launch, the Falcon 9 rocket successfully landed on SpaceX's new Landing Zone 4 (LZ-4) landing pad at the Vandenberg Air Force Base.
Space-X successfully launched an Argentinian radar observation satellite from Vandenberg AFB this evening at 7:21 PDT.
SpaceX has previously landed first stage rockets on land after Florida launches but had not done so on the West Coast.
Landing and refurbishing first-stage boosters is key to SpaceX's plans to decrease launch costs. It has already achieved success in the recovery of rocket boosters several times during the past missions, both on earth and on drone ships at the sea.
Californians from Los Angeles to Sacramento - about 270 miles (435 kilometers) from the launch site - also posted their confusion. SAOCOM 1A is operated by Argentina's Space Agency, the National Commission on Space Activities (CONAE).
"During the landing attempt, residents from Santa Barbara, Ventura and San Luis Obispo counties may hear one or more sonic booms", according to the advisory.
SpaceX inaugurated its West Coast rocket-landing pad in style.
Minutes after launch, the rocket's second stage separated from the first-stage booster and continued rising spaceward.
"SAOCOM" is short for "Satélite Argentino de Observación Con Microondas", which is Spanish for "Argentine Microwave-Observation Satellite".