Re: [MSNoise] One more clarification

Ashton, Agreed. If you set corr_duration to 1800 and leave analysis_duration in the standard 86400, this is exactly what you get in the 1-Day stacks. As I mentioned, if you set analysis_duration to 3600, then you only use 1 hour of data each day and leave the rest untouched… Try it for yourself with the keep_all option enabled and by looking at the data in the h5 files. Lukas 2016-10-12 18:08 GMT+02:00 Flinders, Ashton &lt;aflinders(a)usgs.gov&gt;ov>: > Thanks Lukas! > > I think the part that is throwing me off a bit is the "Daily NCFs were then > obtained by stacking 30-min NCFs". > > This sound like to be, they took their individual 30 min NCFs and stacked > them, so that each day is represented by the stacked summation of 48 > independent NCFs. > > > I'll probably just send an email out to them to see what parameters they > used. > > > On Tue, Oct 11, 2016 at 11:35 PM, Lukas Preiswerk < > preiswerk(a)vaw.baug.ethz.ch&gt; wrote: > >> Hi Ashton, >> >> I can partly answer 1) and 3). First, corr_duration would be 30*60 in >> their paper (corr_duration is in seconds). As far as I understand, >> analysis_duration should almost always be 86400. Setting the >> analysis_duration >> smaller could be used to prevent loading a full day of data for >> specific cases, like super high frequency data (8kHz or more). The >> remaining processing still works on days and not multiples of >> analysis_duration. For examplem if you set analysis_duration to 3600, >> then you only use 1 hour of data each day… >> >> Hope that helps! >> >> Lukas >> >> >> 2016-10-11 18:57 GMT+02:00 Flinders, Ashton &lt;aflinders(a)usgs.gov&gt;ov>: >> > Hi all, I was just reading through Taka'aki and Forents new paper using >> > MSNoise, and was hoping just for a wee bit more clarification on the >> > MSnoise processing scheme (wasnt quite clear in the docs). >> > >> > >> > The paper says; >> > "We first removed the instrument response from 1-day-long waveform to >> > obtain ground motion in displacement. Daily displacement data were >> > bandpassed between 0.08 and 2.0 Hz, down-sampled into 10 Hz, and split >> > into 30-min-long data. Those 30-min-long data were spectral whitened in a >> > frequency range of 0.1–0.9 Hz and then one-bit normalized. With those >> > one-bit normalized data, the NCFs were computed for all possible >> > combinations of components. Daily NCFs were then obtained by stacking >> > 30-min NCFs." >> > >> > >> > Q1) So just in terms of implementation in msnoise admin, the 30-min-long >> > duration would be controlled by "analysis_duration" correct? >> > >> > Q2) If you remove the instrument response, is it always removed from a 1 >> > day chunk, or is it removed from a chunk equal in size to >> > "analysis_duration"? (the docs say 1 day, but I wasnt sure if this was >> just >> > referencing the default "analysis_duration" time). >> > >> > Q3) This probably isnt the intended usage, but if you used >> > "analysis_duration" longer than a day, would you expect things to behave? >> > >> > Thanks as always! >> > >> > -ashton >> > >> > >> > p.s. paper; >> > http://earth-planets-space.springeropen.com/articles/10. >> 1186/s40623-016-0538-6 >> > >> > -- >> > Ashton F. Flinders, Ph.D >> > U.S. Geological Survey >> > 345 Middlefield Road >> > Menlo Park, CA 94025 >> > (650) 329-5050 >> > _______________________________________________ >> > MSNoise mailing list >> > MSNoise(a)mailman-as.oma.be >> > http://mailman-as.oma.be/mailman/listinfo/msnoise >> _______________________________________________ >> MSNoise mailing list >> MSNoise(a)mailman-as.oma.be >> http://mailman-as.oma.be/mailman/listinfo/msnoise >> > > > > -- > Ashton F. Flinders, Ph.D > U.S. Geological Survey > 345 Middlefield Road > Menlo Park, CA 94025 > (650) 329-5050 > _______________________________________________ > MSNoise mailing list > MSNoise(a)mailman-as.oma.be > http://mailman-as.oma.be/mailman/listinfo/msnoise