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Aseismic uplift in southern california.
Southern California is experiencing significant crustal uplift, measuring 0.15 to 0.25 meters, which began around 1960. This geological event covers over 12,000 sq km and is centered near the San Andreas and Garlock faults.
Area of Science:
- Geophysics
- Tectonics
- Geodesy
Background:
- Southern California exhibits ongoing crustal deformation and mobility.
- Historic geodetic data reveals patterns of tectonic activity in the region.
Purpose of the Study:
- To analyze and report on a significant crustal uplift event in southern California.
- To delineate the spatial extent and temporal evolution of this uplift.
Main Methods:
- Analysis of historic geodetic records.
- Examination of crustal deformation data spanning several decades.
Main Results:
- A crustal uplift of 0.15–0.25 meters has been identified, commencing around 1960.
- The uplift affects at least 12,000 sq km, extending along the San Andreas Fault and into the Transverse Ranges and Mojave block.
- The event appears to have grown spasmodically from a center near the San Andreas and Garlock fault junction.
Conclusions:
- The observed uplift is a large and potentially unique event superimposed on existing deformation patterns.
- The uplift occurred in an area largely aseismic since 1932, highlighting unusual tectonic activity.
- Continued monitoring is essential to understand the implications of this significant crustal deformation.
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