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Study on non-tectonic gravity effects in western Shandong.
Shupeng Li1, Chenglin Zhu2, Yiqing Zhu3
1Shandong Earthquake Agency, Jinan, 250014, China.
This study quantifies non-tectonic gravity effects from groundwater changes in Western Shandong, revealing they mask seismic signals. Removing these effects clarifies tectonic gravity changes crucial for earthquake prediction.
Area of Science:
- Geophysics
- Seismology
- Earth Science
Background:
- Earth's gravity field changes are linked to seismic activity.
- Non-tectonic factors like groundwater changes obscure tectonic signals, hindering earthquake prediction accuracy.
Purpose of the Study:
- To identify and eliminate non-tectonic gravity effects in Western Shandong.
- To isolate tectonic gravity signals for improved earthquake prediction.
Main Methods:
- Integrated analysis of gravity, groundwater, and GNSS vertical deformation data (2017-2021).
- Application of an infinite plane layer model to calculate non-tectonic gravity effects.
- Extraction of residual gravity signals attributed to tectonic activity.
Main Results:
- Significant gravity changes correlate with declining groundwater and subsidence.
- Non-tectonic gravity effects reached up to +78.22 µGal.
- Residual gravity changes remained within normal ranges after correction.
Conclusions:
- Non-tectonic gravity effects significantly impact seismic studies in Western Shandong.
- Developed a workflow for correcting non-tectonic gravity effects in similar regions.
- Accurate interpretation of tectonic gravity changes is essential for reliable earthquake prediction.
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