The 1927 Lompoc earthquake occurred on November 4 at 05:49 PST with an epicenter off the coast of Santa Barbara County Southern California.

[1] The earthquake measured 7.0 on the moment magnitude scale and had a maximum Modified Mercalli intensity of IX (Violent).

Seismologists Kenji Satake and Paul G. Somerville determined the earthquake's epicenter to be 34°12′N 120°45′W / 34.2°N 120.75°W / 34.2; -120.75 based on their analysis of the tsunami arrival times.

[2] The fault responsible for the earthquake was a north-northwest trending structure located 40 km (25 mi) offshore west of Point Conception.

A railway worker in Port San Luis said the sea level fluctuated for an hour by 1.5 m (4 ft 11 in); similar observations were made by a lighthouse keeper.

A branch of the Trust and Savings Bank sustained damage to its cornice and operations were suspended until 09:00 PST to remove debris on the sidepath.

Multiple towns, such as Arroyo Grande, Berros, Guadalupe, Halcyon, Lompoc, Los Alamos, and Nipomo, reported that chimneys were destroyed.

The town of Santa Maria and its surrounding reported cracks in old brick walls, detached cornices and damage to chimneys.