1. Direct Measurement:
* Clinometer: This handheld instrument directly measures the angle of inclination, or dip, of a surface. Geologists use it to measure the dip of fault planes, rock layers, and other features.
* Leveling: This technique uses a precise leveling instrument to establish a horizontal reference line and measure the elevation difference between points. This allows for accurate determination of the tilt of the ground.
2. Indirect Measurement:
* Geodetic Surveys: These surveys involve measuring distances and angles over long distances using specialized instruments like GPS or total stations. By comparing measurements taken over time, changes in ground elevation and tilt can be detected.
* InSAR (Interferometric Synthetic Aperture Radar): This remote sensing technique uses satellite radar data to detect ground deformation, including tilting, with high accuracy.
* GPS (Global Positioning System): By monitoring the precise location of GPS receivers installed along the fault, changes in their vertical position can indicate tilting of the ground.
3. Analysis of Geological Features:
* Fault Scarps: These are cliffs or step-like features formed by the displacement of rock along a fault. The angle of the scarp can indicate the tilt of the ground.
* Stream Terraces: These are flat, elevated areas along river valleys that were once the river's floodplain. The angle of the terraces relative to the current river channel can reveal tilting of the ground.
* Tilted Sedimentary Layers: If sedimentary layers are tilted, it indicates that the ground has been tilted since their deposition.
The best method for measuring tilting depends on the specific situation, such as the scale of the tilting, accessibility of the site, and available resources. Often, multiple methods are used to get a more complete understanding of the tilting along a fault.
