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Multidirectional Ridgecrest Quake Triggered Garlock Fault Movement

Multidirectional Ridgecrest Quake Triggered Garlock Fault Movement


Alex Wierbinski's picture

By Alex Wierbinski - Posted on 18 October 2019

 

GEOLOGY, EARTHQUAKES, RIDGECREST QUAKE UPDATE

The Danger Zone, 2018
What are your chances of experiencing Moderately-Damaging Ground Shaking in 2018? USGS
What are your chances of experiencing Moderately-Damaging Ground Shaking in 2018? USGS, original.

 

Multidirectional Ridgecrest Quake Triggered Garlock Fault Movement

Lessons from Ridgecrest,
California Institute of Technology, October 17, 2019.

MAIN POINTS

What
"...a comprehensive analysis of the Ridgecrest Earthquake Sequence by geophysicists from Caltech and JPL..."

The Ridgecrest Earthquake
"The Ridgecrest Earthquake Sequence included a magnitude-6.4 foreshock on July 4, followed by a magnitude-7.1 mainshock nearly 34 hours later, and more than 100,000 aftershocks. The sequence rattled most of Southern California, but the strongest shaking occurred about 200 kilometers north of Los Angeles."

Single-Fault Quake
"Major earthquakes are commonly thought to be caused by the rupture of a single long fault, such as the more than 800-mile-long San Andreas fault, with a maximum possible magnitude that is dictated primarily by the length of the fault."

Multi-Fault Quake
"...the Ridgecrest Sequence provides another example of how massive earthquakes can be generated by a web-like network of smaller interconnected faults that, when they rupture, trigger one another like falling dominoes. The Sequence involved about 20 previously undiscovered faults crisscrossing in a geometrically complex and geologically young fault zone."

Multi-Directional Activity
"...the magnitude-6.4 quake simultaneously broke faults at right angles to each other, which is surprising because standard models of rock friction view this as unlikely."

Kicked Garlock into Motion
"Also noteworthy is that the rupture ended just a few kilometers shy of the nearby Garlock Fault, which stretches more than 300 kilometers across Southern California on the northern boundary of the Mojave Desert. The fault has been relatively quiet for the past 500 years, but the strain placed on the Garlock Fault by July's earthquake activity triggered it to start creeping. Indeed, the fault has slipped two centimeters at the surface since July."

New Perspectives
""We can't just assume that the largest faults dominate the seismic hazard if many smaller faults can link up to create these major quakes."

 

 

Original Quake Report

July 2019
Major 6.4 Earthquake at Ridgecrest Near PCT

 

 

News Report About CIT Research

Potential Consequences of Garlock Fault Activity

Unprecedented Movement Detected on California Earthquake Fault Capable of 8.0 Temblor,
LA Times, October 17, 2019.

MAIN POINTS

Garlock Fault
"A major California fault capable of producing a magnitude 8 earthquake has begun moving for the first time on record, a result of this year’s Ridgecrest earthquake sequence destabilizing nearby faults..."

Scope
"A large quake on the Garlock fault has the potential to send strong shaking to the San Fernando Valley, Santa Clarita, Lancaster, Palmdale, Ventura, Oxnard, Bakersfield and Kern County..."

Scope
"...military installations could also get strong shaking, such as Edwards Air Force Base, Naval Air Weapons Station China Lake and Fort Irwin National Training Center. The fault is crossed by two of Southern California’s most important supplies of imported water — the California and Los Angeles aqueducts — and critical roads like Interstate 5, state routes 14 and 58 and U.S. 395."

Garlock as Trigger
"A major quake on the Garlock fault could then, in turn, destabilize the San Andreas. A powerful earthquake on a stretch of the roughly 300-mile-long southern San Andreas fault could cause the worst shaking the Southern California region has felt since 1857, and send destructive tremors through Los Angeles and beyond."

 

 

Original Quake Report

July 2019
Major 6.4 Earthquake at Ridgecrest Near PCT

 

 

 

More Information

USGS EARTHQUAKE HAZARDS PROGRAM

USGS LATEST EARTHQUAKES MAP & LIST

 

 

Southern California Seismic Network

 

California Fault Map,
California Geological Survey

 

USGS HAZARD MONITORING

 

 

 

Geology Section

October News of Man & Nature

 

 

 

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geology news, research, Ridgecrest Earthquake, Ridgecrest, quake, multiple, fault breaks, activity, movement, Garlock Fault

 

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