geopsy.org

Hi, The average is computed on a log scale. This is maybe the difference with your results. Do you know that you can do the H/V computation with geopsy-hv ? It is a core application (without a graphical interface) that might be useful for large datasets. It does the same job as in the graphical inte...

Hi Sunxu, Effectively, you have the same issue with test.gpy . At first, I was not able to open test_modified.gpy with the ad hoc method: tar xvfz test_modified.gpy I tried with unzip and gunzip . After renaming the .gpy file, mv test_modified.gpy test_modified.gz gunzip test_modified.gz The obtaine...

Dear Ying-Chi, You can access the colour scale in the properties of the graph (double click or right-click, context menu, Properties). In the properties, under tab "Layers", you will find the colour scale that you can eventually edit. To show the plot with its colour scale for a paper figu...

Dear Farhan, Effectively, a 2D layout is better to capture ambient vibrations. With a line, you are never sure that the measured velocity is not an apparent velocity. Theoretically, for long recordings you can retrieve the true velocity if the wavefield is uniformly distributed. With 2D layouts, reg...

Hi, When running geopsy-hv , the parameters used for processing are listed in the terminal and in the .log file. In the log file there is also a list of the time windows. Check with the graphical interface for a particular case. Are the number of time windows the same with geopsy-hv and within the G...

Hi Laleh,

You can access these versions through the git repository. You have to install the build tools and to compile the whole package. It takes some time the first time. Afterwards, it is less time consuming.

What does f_peak mentioned in item 4 of the Criteria for a clear H/V peak in the SESAME Guide Line mean? Does it represent the peak of each window? Condition 4 means that a peak must be observed also on the deviation curves (A_{H/V} * and / sigma_A). This peak must be the same as f_0 +/= 5%. Also, ...

Hi Chenyu, I know that time has passed since you message. Do you still have the plot of H/V with non-log stderr? Are the errors larger with log stderr? Or the contrary? At first glance, the misfit can be larger if the uncertainties are smaller. I checked the code for importing H/V curves inside dinv...

Hi, I confirm IgnazioC's comments. A H/V station is supposed to have three components and located at the same coordinates (Receiver X and Y must be the same for all components). You can also modify these values with a script in menu Edit/Set header . For instance, in your particular case, you should...

_ I was able to import my signal. However, I would like to point out that my signal only contains positive amplitudes after processing. Does this cause any problem with the H/V calculation? In fact, I started the calculation, but I did not receive any results. As far as there is a signal, even it i...

Dear Ilaria, Yes, you can add an ellipticity curve to a target file with gptarget. See "-h add" for details. When you create many target files, check a few target files with the graphical interface to view the curves (File/import target). I checked in the help page of gptarget and I can se...

The fourth column is the weight (the number of samples involved in the mean computation), the fifth column is a valid flag (normally always set to 1).

"Default array groups" is gray because the signals in the current viewer do not meet the criteria for splitting into stations: one signal name per coordinate and all components available for all stations. These are the condition I remember. If you think that they are met and it is still gr...

Hi, Under which format did you try to import the H/V curve into Dinver? Can you provide an example? Note that Dinver invert H/V curves assuming that they are Rayleigh ellipticity curves. If the H/V curve is computed in the classical way, it includes body waves and Love waves as well which leads to m...

No, currently, HVTFA is not available through a command line.
Many stations can be processed at the same time inside the GUI.