Sample interview questions: Explain the process of conducting a gravity survey for geological mapping.
Sample answer:
1. Preparation and Planning:
- Define the objectives of the gravity survey, such as identifying subsurface structures, localizing mineral deposits, or studying geological formations.
- Gather existing geological and geophysical data of the area to understand the regional geology and potential anomalies.
- Select appropriate gravity instruments, such as gravimeters or gravity meters, based on the survey’s objectives and accuracy requirements.
- Design the survey grid pattern and station spacing to ensure adequate data resolution and coverage.
- Obtain necessary permits and permissions for conducting the survey in the designated area.
2. Gravity Data Acquisition:
- Calibrate and test the gravity instruments before starting the survey to ensure accurate measurements.
- Follow standard surveying techniques to precisely locate each gravity station’s position using GPS or other positioning systems.
- Measure gravity values at each station by taking multiple readings and averaging them to minimize measurement errors.
- Record the gravity readings, along with other relevant data such as elevation, time, temperature, and instrument readings.
- Repeat the measurements at selected stations throughout the survey to monitor instrument drift and ensure data consistency.
3. Data Processing and Quality Control:
- Apply necessary corrections to the gravity data to account for instrumental drift, Earth tides, elevation effects, and other factors that can introduce errors.
- Perform quality control checks to identify and remove erroneous or unreliable data points.
- Convert the processed g… Read full answer