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Aseismic uplift in southern california: an alternative interpretation
Previously reported southern California uplift may be due to leveling errors, not tectonic activity. Corrected data reveal minimal vertical motion, except during the San Fernando earthquake.
Area of Science:
- Geodesy
- Geophysics
- Tectonics
Background:
- Previous studies suggested significant tectonic uplift in southern California.
- Geodetic measurements are crucial for understanding crustal deformation.
Purpose of the Study:
- To re-evaluate vertical land-leveling data from southern California.
- To determine if observed uplift is tectonic or due to systematic errors.
Main Methods:
- Analysis of elevation changes correlated with topography at various wavelengths.
- Identification of potential error sources in leveling surveys.
Main Results:
- A strong correlation between elevation changes and topography suggests systematic errors.
- Corrected geodetic data show no significant vertical motion, apart from the San Fernando earthquake.
- Inadequate rod calibration and atmospheric refraction are identified as potential error sources.
Conclusions:
- The previously reported tectonic uplift in southern California is likely an artifact of systematic leveling errors.
- Geodetic measurements require careful error assessment to accurately interpret tectonic signals.
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