the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
| 23 Apr 2025
Optimal site selection for Choutuppal geomagnetic observatory, based on geophysical evidences
Abstract. The development of the stages of the Choutuppal magnetic observatory over last 15 years has enabled the effects of the natural environment like groundwater changes and lightning activity on the magnetic data to be evaluated. A new survey for total field anomalies and analysis of lightning data is carried out to understand the nature of the subsurface. Based on model from high resolution magnetic data and conductivity depth slices from ERT and EVRI surveys, the distribution of sandy regolith, saprolite, and granitic layers in the shallow subsurface to be delineated. This model provides information for selecting a location to install the magnetic observatory by taking into account topography, lightning effect, soil resistivity, low magnetic gradients, and distance from the recharge pond.
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Status: open (until 25 Jun 2025)
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RC1: 'Comment on egusphere-2025-1213', Jan Wittke, 16 May 2025
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Review of
Optimal site selection for Choutuppal geomagnetic observatory, based on geophysical evidences
General:
- There is a lot of information in this contribution. Unfortunately, the actual structure of the article makes it hard to follow the arguments and allows the reader to distinguish between what was done in the past and what was done recently.
- I suppose some kind of timeline or table in the introduction to provide the reader with information on the chronological order of surveys/information/decisions.
- The pictures should be some kind of high resolution or in a vector format which scales well.
Figures: 1: c) d) missing, figures are hard to read.
2: no unit at colorscale
4: a) no unit at colorscale
6: b) distance unit missing
8: should be same nT range for better comparison
11: b) better log-log plot
13: lots of information, pictures need to be bigger
Introduction:
- It is not really clear why a new site should be selected. The authors mention that there is a “Metro Rail project”, but why they need to choose a new site is not explained. What are the consequences and what changes do they expect that will disturb the geomagnetic measurements?
First phase of CPL Magnetic Observatory:
- Line 97: What is PVR and ABS?
Hydrogeological Park and managed aquifer recharge:
- I suppose that CH5 to CH9 are the names for the boreholes? Please clarify.
- Where are they exactly? Ah they are in picture 8 … please reference as they come earlier.
Lightning activity patterns around CPL Observatory and effects on data:
There are two major flaws in this chapter which need to be explained better:
- Why the authors think that a shift in the data offset are due to the lightning activity? Please explain why this is so.
- Line 257 to 259: “It can inferred that the location of the new PVR as well as the fact that the pillars and infrastructure were installed in the surface layer, instead of 3-4 m deeper, has amplified the effects of lightning activity on the data.”
Why is this? Why should a deeper installation neglect a lightning effect? And why should a surface soil layer amplify the effects of lightning? Please explain.
New search for optimal location
- Please explain why you choose ERT surveys to make a decision om a specific site which migrates the problems with lightning.
- What is a RTE filtered map? Is it reduced to equator?
2024 survey
- This chapter would benefit from a more detailed description of the ERT survey and its result, as well as a better picture of the conductivity result.
Discussion and conclusion: proposed optimal location for SVR
- In this chapter the authors explained the measurements in detail, but a discussion on the proposed optimal location for the SVR is almost missing. The chapter would benefit enormously from a discussion why these measurements lead to a decision.
Citation: https://doi.org/10.5194/egusphere-2025-1213-RC1
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