Notifications
Clear all
Search result for: id10=WA 0821 7001 0763 (FORTRESS) Pintu Baja Double Pulau Laut Tanjung Selayar Baru
| # | Post Title | Result Info | Date | User | Forum |
| Windows11 compatible MagLog software | 3 Relevance | 5 months ago | Rui Zhang | Software | |
| To make MagLog software compatible with Windows11 OS, follow the steps below: 1. Download and unzip the file below to your local computer. Attachment : MagLog2017.zip 2. Make sure the installed MagLog program is not running. If it is running in the background you will need to go to the task manager and manually close the program by selecting end task. For those that may have used to compatibility work around, revert back to default by unclicking Compatibility mode in the Properties>Compatibility menu of the MagLog software. 3. Navigate to the folder where the unzipped files are. Double click and run the "maglog2017.exe" file. 4. Once the MagLog user interface pops up, the software is updated. Close the program. 5. Now the installed MagLog program should be compatible with Windows11 even after the downloaded files, including "maglog2017.exe", are removed from your computer. Please leave a message below if it does NOT work for you! A new MagLog installer will come out later. | |||||
| How to integrate elevation data in SeisImager? | 3 Relevance | 8 months ago | Kolby Pedrie | SeisImager Software | |
| 🧭 How to Import Geophone Elevation Data into Plotrefa If you have measured relative or absolute geophone elevations, you can incorporate these into your velocity model in Plotrefa to produce more geologically realistic results. 📄 Step 1: Prepare the Elevation File Create an ASCII text file with two columns: The left column contains geophone horizontal positions (in meters or feet). The right column contains the corresponding elevation values. Example: 0.0 100.0 5.0 101.2 10.0 101.5 ... 100.0 89.0 ✅ Tip: While it’s recommended to have an elevation for each geophone, it’s not strictly required. Plotrefa will interpolate missing elevations as needed. 📥 Step 2: Import the Elevation Data Open Plotrefa. From the top menu, go to:Velocity model > Import elevation data file Navigate to your file and Double-click it to import.📌 Note: There is no default file extension, so ensure your file is visible in the dialog. The elevation profile will now display alongside your data. 🎯 Step 3: Interpret Your Data Once your elevation profile is imported: Proceed with your velocity modeling or time-term inversion. The resulting velocity model will be drawn relative to the elevation profile, accounting for topography. Example Outputs: Attachment : seismic_velocity_profile.png | |||||
| Integrating log data in SeisImager (SPT, DCP, N-Value, Soil Logs) | 3 Relevance | 9 months ago | Kolby Pedrie | SeisImager Software | |
| The Drawing Tool menu provides functionality for integrating log file datasets—such as N-value, boring, soil, and DCP logs—with velocity profiles. Below is an example of a boring data log .txt file that includes a soil column: 0.45 8 1.45 8 2.45 1 3.45 5 4.45 5 5.45 31 6.45 21 7.45 23 8.45 31 9.45 22 10.45 8 11.45 11 12.45 12 13.45 8 14.45 3 15.45 32 16.45 33 17.45 42 4.9 C Clay 17.45 G Gravel Log files can be loaded with or without headers. To load a log file, navigate to the Drawing Tool menu. After loading, use the Select Tool (represented by the arrow icon in the top toolbar) to interact with the objects in the plot. Attachment : image018.png The Select Tool allows you to select and edit objects such as logs. To modify a log, Double-click near the base of the comment line associated with the log. A configuration menu will appear, where you can specify the data type—N-value, Line, or Soil Column—and adjust axis settings and labels as needed. | |||||
| Cesium Magnetometer Sensor Bandwidth | 3 Relevance | 2 years ago | Gretchen Schmauder | Hardware | |
| The subject of "Bandwidth" comes up often when discussing cesium magnetometers. There are two different aspects of bandwidth that are different and need to be differentiated: The cesium magnetometer uses an atomic resonance of the Cs 133 atom (see note 1 below) which varies proportional to the ambient magnetic field. This atomic resonance is used to set/control the frequency of an oscillator. Therefore the output signal from the magnetometer is a *frequency* which is proportional to the earth's magnetic field at a coefficient of 3.498572 Hertz per nT. Thus the output frequency (called the Larmor frequency) varies from roughly 70KHz at the equator to 350 KHz at the poles. Because the cesium magnetometer is an oscillator, and because phase is important in an oscillator, the "Bandwidth" of the electronics in the magnetometer must be at least 10 times higher than the maximum output frequency of 350 Khz, or roughly 3.5 MHz. This bandwidth should not be confused with the magnetic field measurement "Bandwidth", or how fast of a magnetic field change can be measured. To put a scaler value on any magnetic field reading the output frequency of the magnetometer must be counted, and then scaled appropriately to get a field reading in nanoTeslas. The counting process involves opening a gate period, counting the number of Larmor (frequency) cycles that occur, divide that number by the precise time interval of the gate period. then scale that value by dividing by the 3.498572 Hz / Larmor coefficient. You get one reading per gate period, which by default is five or ten hertz (200mS to 100 mS gate period). What you get for a reading during any gate period is the time interval average of the Larmor frequency over that period. The transfer function of a "time interval averaged" signal is [sine(x) / x] with the first zero falling at the sample frequency. Thus if the G-882 is sampling at 10 hertz the maximum resolvable magnetic field change is roughly 5 hertz. The sample interval of the G-882 is adjustable by sending commands to it. If the sample rate is set to 20 hertz the measurement bandwidth will Double (from a 10 hertz sample rate) but the base line noise will go up as well. It should also be noted that the basic system noise level of the G-882 for a stationary sensor is set by the counter resolution - not by the signal to noise ratio of the oscillator electronics. If the sensor is tilted away from its optimum orientation the magnetometer signal will decrease (and therefore the signal to noise ratio), but the counted field output will not show any significant degradation until the sensor is approaching the dead zone (where the signal is really low). | |||||
| Cesium Magnetometer Sensor Bandwidth | 3 Relevance | 2 years ago | Gretchen Schmauder | Hardware | |
| The subject of "Bandwidth" comes up often when discussing cesium magnetometers. There are two different aspects of bandwidth that are different and need to be differentiated: The cesium magnetometer uses an atomic resonance of the Cs 133 atom (see note 1 below) which varies proportional to the ambient magnetic field. This atomic resonance is used to set/control the frequency of an oscillator. Therefore the output signal from the magnetometer is a *frequency* which is proportional to the earth's magnetic field at a coefficient of 3.498572 Hertz per nT. Thus the output frequency (called the Larmor frequency) varies from roughly 70KHz at the equator to 350 KHz at the poles. Because the cesium magnetometer is an oscillator, and because phase is important in an oscillator, the "Bandwidth" of the electronics in the magnetometer must be at least 10 times higher than the maximum output frequency of 350 Khz, or roughly 3.5 MHz. This bandwidth should not be confused with the magnetic field measurement "Bandwidth", or how fast of a magnetic field change can be measured. To put a scaler value on any magnetic field reading the output frequency of the magnetometer must be counted, and then scaled appropriately to get a field reading in nanoTeslas. The counting process involves opening a gate period, counting the number of Larmor (frequency) cycles that occur, divide that number by the precise time interval of the gate period. then scale that value by dividing by the 3.498572 Hz / Larmor coefficient. You get one reading per gate period, which by default is five or ten hertz (200mS to 100 mS gate period). What you get for a reading during any gate period is the time interval average of the Larmor frequency over that period. The transfer function of a "time interval averaged" signal is [sine(x) / x] with the first zero falling at the sample frequency. Thus if the G-882 is sampling at 10 hertz the maximum resolvable magnetic field change is roughly 5 hertz. The sample interval of the G-882 is adjustable by sending commands to it. If the sample rate is set to 20 hertz the measurement bandwidth will Double (from a 10 hertz sample rate) but the base line noise will go up as well. It should also be noted that the basic system noise level of the G-882 for a stationary sensor is set by the counter resolution - not by the signal to noise ratio of the oscillator electronics. If the sensor is tilted away from its optimum orientation the magnetometer signal will decrease (and therefore the signal to noise ratio), but the counted field output will not show any significant degradation until the sensor is approaching the dead zone (where the signal is really low). | |||||
