3.2 Earthquake Hits Hollywood Fault – UPDATE: New 3.4 quake

A minor earthquake occurred at 3:26:56 AM (PDT) on Monday, September 3, 2012. The magnitude 3.3 event occurred 1 km (1 miles) ENE (62 degrees) of Beverly Hills, CA. The hypocentral depth is 0.1 km (0.1 miles).

The Hollywood Fault runs along Hollywood Blvd and is directly under the land where Millennium want to build two tall skyscrapers. The Hollywood Community Plan calls for many more tall buildings in this area.

Earthquake Shake Map

The Hollywood Community Plan Draft Environmental Impact Report states:

Hollywood Fault. The Hollywood fault is located along the southern base of the Santa Monica Mountains, beneath northern Hollywood. Rupture of the entire Hollywood fault could produce a magnitude 6.6 earthquake (Dolan et al., 1997). The active Hollywood fault trends approximately east-west along the base of the Santa Monica Mountains from the Beverly Hills area to the Los Feliz area of Los Angeles (Dolan et al., 2000). Studies by several investigators have indicated that the fault is active, based on geomorphic evidence, stratigraphic correlation between exploratory borings, and fault trenching studies (Dolan et al., 2000). The fault is also considered active by the State Geologist. However, there is an absence of well-defined surface fault traces. For this reason, an Alquist-Priolo zone has not been established for this fault.” [emphasis added]

UPDATE: A minor earthquake occurred at 0:03:09 AM (PDT) on Friday, September 7, 2012. The magnitude 3.4 event occurred 1 km (0 miles) SE of Beverly Hills, CA. The hypocentral depth is 2 km (1 mile). The quake was 1.6 times stronger than the one last week.

New Earthquake Shake Map

The earthquake faults in Hollywood are described in this report from the Southern California Earthquake Center:

Active Faults in the Los Angeles Metropolitan Region

Santa Monica fault

The Santa Monica fault extends east from the coastline in Pacific Palisades through Santa  Monica and West Los Angeles and merges with the Hollywood fault at the West Beverly Hills  Lineament in Beverly Hills, west of the crossing of Santa Monica Boulevard and Wilshire Boulevard, where its strike is northeast.

Hollywood fault

The Hollywood fault extends ENE for a distance of 14 km through Beverly Hills, West  Hollywood, and Hollywood to the Los Angeles River and Interstate 5. It is truncated on the west  by the NNW-striking West Beverly Hills Lineament (WBHL), which marks a left step of 1.2 km  between the Santa Monica fault and Hollywood fault (Dolan et al., 2000a). The lineament,  located in Beverly Hills immediately east of the Los Angeles Country Club, is on trend with, and may be the northwest continuation of the Newport-Inglewood fault.

Raymond fault

The Raymond fault extends 25 km from the Los Angeles River east of Griffith Park east to east-northeast across the San Gabriel Valley through South Pasadena, Pasadena, San Marino, Arcadia, and Monrovia to a junction with the Sierra Madre fault at the foot of the San Gabriel Mountains

SCEC video (Santa Monica, Hollywood, Raymond Fault Relationship) from USC showing the faults.

The Santa Monica fault is shown in blue, the Hollywood fault is shown in yellow and the Raymond fault is shown in green.

Beverly Hills Earthquake Hit at Intersection of 2 Major Faults

“The earthquakes that hit this week — a 3.2 on Monday, centered near Doheny Drive and Wilshire Boulevard,  and a 3.4 after midnight Friday, centered near Wilshire Boulevard and Beverly Drive — were relatively shallow. “As a result, they were strongly felt,” [U.S. Geological Survey geophysicist Doug] Given said.”

Doheny Drive and Wilshire Boulevard and Beverly Drive and Wilshire Boulevard are both east of the West Beverly Hills Lineament (WBHL) immediately east of the Los Angeles Country Club. This places the quakes on the Hollywood fault.