Search found 159 matches

by luigiV
Thu Jan 18, 2024 3:58 pm
Forum: Geopsy usage
Topic: first question about Geopsy 3.5.1
Replies: 1
Views: 174

first question about Geopsy 3.5.1

Hi Marc, thanks for the new release of Geopsy! I have a first question about the H/V tool. In the H/V toolbox/processing/taper window "flat top" appears the first time I use it. Is this a new indication compared to that of previous releases (Tukey) or is it simply a setting "inherited...
by luigiV
Sat Aug 05, 2023 5:02 pm
Forum: Ambient vibration techniques
Topic: fundamental frequency greater than 1 Hz.
Replies: 2
Views: 3564

Re: fundamental frequency greater than 1 Hz.

When the bedrock/reflector is at small-medium depth it is very likely that it produces an H/V peak with a frequency >1Hz which has non-anthropogenic characteristics verifiable both by the power spectrum and by the application of Ramdondec.

Luigi
by luigiV
Fri Jul 28, 2023 9:45 am
Forum: Geopsy usage
Topic: taper window type in H/V computation
Replies: 2
Views: 3996

Re: taper window type in H/V computation

Hi Marc, now everything is clear. In fact, after sending my post, I found your answer to Luke on the same topic where you explained that with version 3, to get the same response as version 2, the window type Tukey must be used for the taper. Now, in addition, I learned that with version 2 the button...
by luigiV
Thu Jul 20, 2023 4:48 pm
Forum: Geopsy usage
Topic: taper window type in H/V computation
Replies: 2
Views: 3996

taper window type in H/V computation

Hi Marc, while for the smoothing function in H/V computation SESAME guidelines suggest the adoption of the Konno&Ohmachi filter, there is no indication regarding the type of window for the taper (this choice is present only since version 3.0). So far I have used Konno&Ohmachi because the ado...
by luigiV
Tue Feb 21, 2023 3:46 pm
Forum: Geopsy usage
Topic: Stacking of shots
Replies: 6
Views: 4100

Re: Stacking of shots

Sorry Marc,
but in my release (3.4.2) under Waveform there is no "add signals" option (only substract signals).
by luigiV
Fri Feb 17, 2023 4:05 pm
Forum: General usage
Topic: Joint Inversion N/V-DC
Replies: 1
Views: 2602

Joint Inversion N/V-DC

Hi Marc,
could the use of the N/V curve in the joint inversion with DC, instead of the H/V one, be an acceptable approach for the suppression of Love waves contribution?

Thanks

Luigi
by luigiV
Fri Feb 10, 2023 10:51 am
Forum: Geopsy usage
Topic: objects rotation
Replies: 2
Views: 2517

objects rotation

Hi Marc,
is it possible to rotate the objects?
For example if in H/V rotate I wanted to put the frequency on the y axis how could I do it?

Thanks

Luigi
by luigiV
Sat Feb 04, 2023 5:42 pm
Forum: Geopsy usage
Topic: Stacking of shots
Replies: 6
Views: 4100

Re: Stacking of shots

Hi Marc,
I want to ask you what are the steps to obtain a sum file in time domain. I tried, but the result is always a graphical window with all files to be stacked in sequence, just like with dragging and dropping.
Thanks
Luigi
by luigiV
Mon Jan 23, 2023 2:40 pm
Forum: Geopsy usage
Topic: New masw problem with Geopsy releases above 3.0
Replies: 7
Views: 6796

Re: New masw problem with Geopsy releases above 3.0

Hi Marc,
after my post last year, the problem has not arisen again. After Pourya's post and your reply, I've verified that the step count is actually set to 100. If I set it to 1 the Active FK window remains empty.

Luigi
by luigiV
Sat Jan 14, 2023 3:23 pm
Forum: Miscellaneous
Topic: HVSR time histories
Replies: 4
Views: 12684

Re: HVSR time histories

I found only one post, scrolling the list because the keywords suggested for the search are considered too generic. The post is 207 and your reply (year 2012) was a commitment to implement this utility in the next releases ( "Currently not, but it is an option we will certainly implement in a c...
by luigiV
Fri Jan 13, 2023 11:01 am
Forum: Miscellaneous
Topic: HVSR time histories
Replies: 4
Views: 12684

HVSR time histories

Hi Marc,
I would like to represent the HVSR time histories.
Is it possible to do this with Geopsy?

Thanks
Luigi
by luigiV
Thu Jan 12, 2023 3:23 pm
Forum: General usage
Topic: Damping and H/V
Replies: 2
Views: 3274

Re: Damping and H/V

Thanks a lot
by luigiV
Wed Jan 11, 2023 5:16 pm
Forum: General usage
Topic: Damping and H/V
Replies: 2
Views: 3274

Damping and H/V

Hi Marc, In a your work you used damping to prove that the H/V peak was natural. This is interesting because it adds to the "classic" satisfaction of the SESAME parameters to declare naturalness. In the Geopsy documentation there are indications for setting the parameters (size of the wind...
by luigiV
Tue Jan 10, 2023 10:15 am
Forum: Dinver usage
Topic: anomalous Standard Deviation
Replies: 6
Views: 4196

Re: anomalous Standard Deviation

I have tested previous dispersion curves that correctly represented 10% with 0.1 and found that they all now have the anomaly of representing 10% with 1.1. Previously I had recorded that the mean curve automatically provided absurd standard deviation bars, equal to the ones I now obtain by applying ...
by luigiV
Mon Jan 09, 2023 4:43 pm
Forum: Dinver usage
Topic: anomalous Standard Deviation
Replies: 6
Views: 4196

Re: anomalous Standard Deviation

Of course,3.4.2, that's why I was surprised both that 0.1, which always worked, was no longer correct, and that 1.1 gave the right result, overnight.

With Geopsy 2.10 to get 10% I have to write 0.001.

Regard

Luigi