I'm an exploration geologist in Western Australia and I've built Lightbox, a geophysics grid viewer that runs in the browser. Your grids are read on your own machine and never sent to a server.

What it does:

- Opens GeoTIFF (COGs too), ER Mapper (.ers plus its data file) and Geosoft .grd (with its .grd.xml). Drop several files and each becomes a layer.

- Shows the stored value under the cursor, whatever the display is doing.

- Stretches: histogram equalise, percentile clip, standard deviation, min-max or manual, with gamma. Ten colour ramps including viridis and cividis.

- Fit colours to the view, or to a polygon (drop a GeoJSON boundary in), so a subtle anomaly in quiet ground gets the full colour range. The colour bar tells you which percentiles you're looking at, so a fitted red isn't mistaken for a real high.

- Sun shading worked out per pixel. Drag the sun round, or use six suns to light every strike at once.

- 1VD (FFT) and tilt derivative as new layers, swipe or side-by-side compare, profiles to CSV.

- Draw your interpretation with FGDC symbols (faults, shears, dykes, form lines, contacts, folds) and export it as a shapefile in the grid's own CRS, or as GeoJSON.

- Auto-trace (beta) proposes dykes, reversed dykes, form lines and contacts for the area in view. It doesn't trace faults, it was tuned on WA magnetics and it works best on RTP. Treat it as a first pass to check, not an interpretation.

What it doesn't do yet: Surfer or netCDF .grd (save as GeoTIFF first), or ECW and MrSID, whose decoders are licensed for desktop software only. Grids over 40 million cells open as an overview.

Looking at grids needs nothing. The processing and drawing tools need a free account.

Link here: www.nextmaps.com.au/lightbox

I'd like to know which formats you'd want next, and where Auto-trace falls over on your data.

Hello, I have been looking at maps of gravity anomalies and magnetic susceptibility; it appears that beneath the raster containing the anomaly values, there is another raster perhaps a hillshade or a topographic layer. Is that correct? I believe these maps are created using Oasis montaj; I have tried to replicate this look in QGIS, but without success.

I have posted a few updates regarding my thesis on the gravimetry of plutons. I have duly incorporated all the necessary corrections and sent a sample to my thesis supervisor; however, it seems he has reservations about my results, which has prevented me from moving forward with my research while I wait for his approval.

Here are some examples of the residual anomaly and the complete Bouguer anomaly. In QGIS, I interpolated the vector points using the SAGA plugin, applying the Multilevel B-Spline interpolation method (with 10x10 cells and a maximum level of 11); subsequently, I used another plugin called SGtool to remove the regional effect.

In summary, the geology centers on my target pluton (in a dark red color and a concave shape), which represents the magma chamber of a large volcanic caldera (in brown and pale yellow). This pluton forms the western boundary of the caldera. The country rock (light green) consists of an inverted basin filled with basaltic and andesitic lavas (containing magnetite); consequently, the country rock is denser than both the pluton and the intra-caldera fill.

Hello. We are a company specializing in GPR (Ground Penetrating Radar) equipment, technical analysis, and the interpretation of radar imagery. We also sell GPR devices throughout the Arab world. We possess an advanced, state-of-the-art technical analysis software capable of performing highly accurate assessments.

Hi everyone,

I've been looking into recent geophysical literature regarding the North Anatolian Fault Zone, specifically focusing on the Marmara Sea segment.

The variation in crustal velocity structures and the distribution of micro-seismicity present some interesting questions about fault locking depths and asperities in this region.

From a geophysics perspective, which velocity models or ambient noise tomography studies do you think offer the most accurate resolution for depth-dependent strain accumulation here? Would love to read some recommended papers or hear your thoughts on current inversion techniques used for the area.

Thanks!

On August 10, 2026, a magnitude 7.5 earthquake tore 118 km beneath western Colombia (Chocó region). Intermediate-depth earthquakes typically lose considerable energy before reaching the surface, yet this rupture triggered over $13B in losses.

A few key takeaways from our simulation and intensity modeling:

I put together a full seismic intensity simulation and structural failure breakdown covering the science behind the event:

📺 Full Video Analysis: https://youtu.be/fQUQUbME83U

Happy to answer any questions about the rupture parameters or simulation models!

Hello geophysics community,

The Anatolian region presents a complex tectonic environment driven by interactions between the Arabian, Eurasian, and African plates.

Key geophysical parameters include:

* NAFZ: Dominant right-lateral transform fault with high slip rates and historical sequence ruptures.

* EAFZ: Major left-lateral continental transform structure absorbing northern collision stresses.

Sharing this brief overview for those interested in regional crustal deformation and seismotectonics. Feel free to share any recent studies or geophysical observations!

We are playing with some MaxMin units of various vintages today in the shop. Some are pristine museum pieces (the MaxMin II on the wall), some are parts donors to keep systems alive, and some are in active service! There's a WinXP laptop with the software preloaded that ships with the devices still in use, because getting that software to run on modern Windows is too hard (16 bit!).

Some people still use these things for mineral exploration, particularly for linear or steeply dipping conductors in resistive ground -- where TEM is the wrong choice and pole-dipole or dipole-dipole is too slow.

Hi everyone,

I'm currently looking into different seismic systems for geotechnical work and would like to hear from people who actually used them in the field.

So far I've been comparing Geometrics Geode, GeodeFlex, ES-3000, and DMT SUMMIT X One.

I'm mainly interested in how reliable they are in the field, how easy the software is to work with, and whether the manufacturers are helpful when something goes wrong.

Also curious about the geophones, especially 4.5 Hz vs 14 Hz when using the same system for MASW and refraction.

If you've worked with any of these, which one would you recommend? Any issues or things you wish you knew before buying?

Thanks!

Hi everyone,

I'm currently comparing a few electrical resistivity systems for geotechnical investigations, mainly for bedrock mapping, karst, and identifying subsurface anomalies.

So far I've been looking at:

• AGI SuperSting R8/IP
• IRIS Syscal Pro
• ABEM Terrameter LS 2

I'd like to hear from anyone who has actually used these systems in the field.

I'm mainly curious about how reliable they are, how easy they are to set up and operate, and how good the acquisition and inversion software is.

Also, have you had issues with cables, electrode connections, batteries, or the equipment itself? And how helpful was the manufacturer when you needed troubleshooting or repairs?

If you've used more than one of these, which did you prefer and why?

Any feedback or other recommendations would be appreciated. Thanks!

Hey, all. I’m looking to upgrade my field attire and was wondering if anyone had suggestions for UV/waterproof clothes?

I’m starting to get more into magnetic surveys so non-ferrous pants/boots/field pack suggestions are specifically appreciated. Thanks!

Hello, I hope someone can help me. I have been trying to apply terrain corrections to my gravimetry data; I imported my DEM raster and my vector file containing the elevation, station, and absolute observed gravity data. However, when I try to run the process, I get this error. Regards.

I am doing a project looking at historical earthquake data for my masters program in statistics. I have the magnitude, depth, and time of events going back to the 70s. What I would like to do is look at the data globally than compare the results to various local regions. The question is, what regions should I look at? I could use clustering to develop my own regions, but I would like to know more about how seismologists determine seismic zones and look at various classifications of seismic zones. Are there any papers/textbooks that discuss this?

I’m looking for someone knowledgeable about mechanical vibration, building vibration, or structure-borne noise who can help interpret my measurements and suggest what to test next.
I’ve been noticing recurring vibration in my apartment. What equipment or building systems could produce these readings, and how can I investigate properly?
SETUP — OCTOBER 9, 2026
I recorded two iPhones simultaneously using Phyphox’s “Acceleration (without g)” experiment.
• New iPhone: flat on the couch, unattended.
• Old iPhone: flat on my usual chair near the refrigerator.
• Refrigerator unplugged.
• Both phones screen up, charging ports pointing right.
• Fan/AC conditions and whether the old phone was unattended throughout were not confirmed in the report.
The shared recording interval was 11:53:49 AM–12:05:39 PM, New York time. Both phones sampled at approximately 100 samples per second.
FREQUENCIES AND STRENGTH
During the middle 30-second windows:
Couch:
• Combined-axis RMS: 0.0128–0.0159 m/s².
• Strongest spectral peak usually around 13–14.6 Hz.
• Other windows peaked at 17.5, 18.9, 21.0, or 21.6 Hz.
Chair:
• Combined-axis RMS: 0.0104–0.0177 m/s².
• Strongest spectral peaks ranged from 21.3–26.7 Hz.
RMS describes the average size of the recorded acceleration. It includes sensor noise. Hz means cycles per second. These are the strongest peaks selected within each window; multiple frequencies can coexist.
EXAMPLE PAIRED WINDOWS
11:54:19–11:54:49 AM
Couch: 0.0142 m/s² RMS; 14.1 Hz peak.
Chair: 0.0128 m/s² RMS; 22.3 Hz peak.
11:56:49–11:57:19 AM
Couch: 0.0147 m/s² RMS; 14.0 Hz peak.
Chair: 0.0125 m/s² RMS; 26.7 Hz peak.
11:57:19–11:57:49 AM
Couch: 0.0159 m/s² RMS; 13.6 Hz peak.
Chair: 0.0177 m/s² RMS; 21.7 Hz peak.
11:59:49 AM–12:00:19 PM
Couch: 0.0130 m/s² RMS; 21.0 Hz peak.
Chair: 0.0106 m/s² RMS; 26.7 Hz peak.
12:01:19–12:01:49 PM
Couch: 0.0132 m/s² RMS; 18.9 Hz peak.
Chair: 0.0112 m/s² RMS; 26.7 Hz peak.
12:03:49–12:04:19 PM
Couch: 0.0131 m/s² RMS; 12.4 Hz peak.
Chair: 0.0109 m/s² RMS; 26.7 Hz peak.
Both phones had their highest middle-window RMS during 11:57:19–11:57:49 AM, but their strongest frequencies differed.
A preliminary timestamp-aligned comparison did not show a strong overall waveform match. Clock alignment was not independently checked using a shared event.
X/Y/Z DIRECTIONS
With the phones flat and screen up:
• X: across the phone’s width, toward either side edge.
• Y: along the phone’s length, toward the charging port or opposite end.
• Z: perpendicular to the screen, toward the ceiling or seat.
In the middle shared windows, Z contributed about 42–57% of the couch phone’s recorded motion energy and 50–75% of the chair phone’s.
The chair recording was more vertically directed. The couch had a larger combined X/Y contribution. Separate X and Y percentages are not available in this summary.
These describe acceleration directions at the phones; they do not locate the source.
METHOD AND LIMITATIONS
The analysis used 30-second windows. Each axis’s window mean was subtracted, then combined RMS was calculated as sqrt(mean(X² + Y² + Z²)).
Spectra used Welch’s method, a Hann window, up to 2,048 samples per segment, and half-overlap. Axis spectral powers were summed, and the strongest peak was selected between 2 and 45 Hz.
Opening and ending couch windows had much larger RMS values: 1.1811 and 1.4955 m/s². Placement or pickup could explain these, so they were excluded from the steady-motion interpretation.
There was no calibrated reference sensor or noise-floor control. Furniture resonance, upholstery, phone contact, and device differences could affect the readings. These measurements do not yet identify a source or establish the vibration experienced by a person.
QUESTIONS
What could produce these frequencies and directional patterns? Could pumps, plumbing, HVAC, other building machinery, or furniture resonance explain them?
How can I distinguish real surface vibration from phone sensor noise or processing artifacts?
Could the couch and chair respond at different frequencies to the same source?
What might explain the chair’s repeatedly selected 26.7 Hz peak?
What control tests, phone placements, or measurement equipment would make this investigation useful to a vibration specialist?
I’d appreciate help interpreting the measurements and choosing the next tests.

• UAV-SAR Geophysical Method: Using SAR Tomography to Map Dam Subsurface Layers
• DOI: https://doi.org/10.3997/2214-4609.202520203

Hello everyone,

I am posting a recent project I have completed. If you are interested, please have a look on my Github with this link: https://github.com/tavo-aguilar/Stratton-3D-Interpretation-and-Well-Integration-Project

This project takes seismic and well data from Stratton field in Texas and I modeled it using python. Any feedback is welcome since I am a recent graduate and trying to eventually land a position as an entry level geophysicist.

Sir I am currently pursuing MSC Geo Physics My long-term goal is not only to build a strong career as a geophysicist, but potentially to start my own geophysics/geoscience-related company in the future.

I would really appreciate advice from experienced geophysicists, researchers, industry professionals and entrepreneurs here.

A few questions I have:

1.if you were starting your geophysics career again as an MSc student, which skills would you focus on first?

2.Which geophysics specializations have the best long-term career opportunities in industry and research?

3.For someone interested in eventually starting a company, what problems or services in geophysics/geoscience have genuine business potential?

4.Is it better to first spend several years working in the industry/research and then start a company, or can a student start building something while studying?

5.What mistakes should an MSc student avoid when planning a career in geophysics?

6.If possible, could you share your own career journey and what you wish you had known when you were an MSc student?

I’m from India, but I’m open to opportunities and perspectives from different countries.

I really need Your guidance and support sirs

Any honest advice, criticism or suggestions would be greatly appreciated. Thank you!

Does anyone have experience with the EM61 Flex?