Search found 9 matches

by Alejandro
Tue Aug 11, 2020 7:51 pm
Forum: General Geophysics and Geoscience
Topic: How to identify the arrival of P,S and Surface waves?
Replies: 0
Views: 701

How to identify the arrival of P,S and Surface waves?

Hi guys I'been practicing some scripting on MATLAB for seismic signal analysis. I'm looking for a way to find the P and S wave arrival times, but without the need of looking at it visually. I mean, I could identify this wave visually, but I would like to implement a criteria for a script, for exampl...
by Alejandro
Fri Jun 19, 2020 9:50 pm
Forum: Near Surface Geophysics
Topic: software for MASW analysis
Replies: 5
Views: 1474

Re: software for MASW analysis

Hi Maybe you should take a look at Geopsy, I'm not sure how good it is on its results, but it has a tutorial to process MASW. I usually works with PARKSEIS. You can download the software right from their page. I'll give you a link of the tutorial to MASW http://www.geopsy.org/wiki/index.php/Active_s...
by Alejandro
Sun May 31, 2020 3:58 pm
Forum: General Geophysics and Geoscience
Topic: Filters used in signal analysis, FIR or IIR?
Replies: 3
Views: 832

Filters used in signal analysis, FIR or IIR?

Hi guys I've been practicing the filtering of signals in Matlab, but, as always, I have a question.. What are the most common filters used in Geophysics? FIR or IIR? I think the FIR are more effective (and they can be designed as a linear phase Filter, and they are always stable), but at the expense...
by Alejandro
Tue Apr 07, 2020 6:28 pm
Forum: General Geophysics and Geoscience
Topic: Surface waves modes help
Replies: 1
Views: 4101

Re: Surface waves modes help

This is what I understand about it An object (string, particle, etc..) can only vibrate in a stable and sustained way (periodic wave) only at certain excitation frequencies. The lowest of these frequencies is known as the fundamental frequency (or fundamental mode). This is, the lowest frequency tha...
by Alejandro
Mon Mar 23, 2020 12:20 pm
Forum: General Geophysics and Geoscience
Topic: Geophysical instruments: Geophone
Replies: 2
Views: 3823

Re: Geophysical instruments: Geophone

Thanks geophix!
by Alejandro
Tue Mar 17, 2020 11:53 pm
Forum: General Geophysics and Geoscience
Topic: Geophysical instruments: Geophone
Replies: 2
Views: 3823

Geophysical instruments: Geophone

Hi guys I'm learning about geophones, but I have a question, maybe a bit dumb.. when we say, for example, that a geophone has a natural frequency of 10 Hz.. what does it means? That above that frequency (or below) it will not work properly? I'm a bit confused, and I haven't found a good answer.. :| ...
by Alejandro
Fri Oct 19, 2018 11:30 am
Forum: General Geophysics and Geoscience
Topic: Inverse Problem - DCIP data
Replies: 2
Views: 1080

Inverse Problem - DCIP data

Hi guys I've been studying the inversion theory, cause I'm applying it to DCIP data, using the UBC DCIP2D program. I'm a bit confused about the relationship between the standard deviation of the data and the inversion process. I mean, for example if the standard deviation of one datum in particular ...
by Alejandro
Thu Oct 18, 2018 2:50 pm
Forum: General Geophysics and Geoscience
Topic: Inversion theory - DCIP survey
Replies: 0
Views: 949

Inversion theory - DCIP survey

Hi guys I've been studying the inversion theory, cause I'm applying it to DCIP data, using the UBC DCIP2D program. I'm a bit confused about the relationship between the standard deviation of the data and the inversion process. I mean, for example if the standard deviation of one datum in particular ...