[MSNoise] MSNoise Digest, Vol 31, Issue 1

[Thomas Lecocq]

Dear All,

small note here:

pleaaaase, if something is not clear in the Documentation and you think 
that, after asking your questions and getting answers from the mailing 
list, you have suggestions to be more accurate, precise or else, don't 
hesitate to suggest changes (via github issues, pull requests or even 
email), it'll be beneficial to all users!

I'm the worst person to write doc about MSNoise, because I know it too well.

Cheers

Thomas


On 06/10/2016 19:17, Esteban Chaves wrote:
> Hi Ashton,
>
> As an active user:
>
> I highly recommend you to check the documentation: http://msnoise.org/doc/workflow.html#module-msnoise.s03compute_cc <http://msnoise.org/doc/workflow.html#module-msnoise.s03compute_cc>
> I think the pre-processing and processing steps are well documented in the web site.
>
> 1) Yes. It is more efficient to compute the cross-correlation functions or Green’s functions using 30-min chunks. Although you can change this feature if you will. Segments are re-build afterwards.
>
> 2) You need to define the filters in order to compute the cross-correlations and extract the coherent part of the ambient noise for a given frequency range. MWCS is used to compute the moving window cross spectral analysis after the cross-correlation procedure.
>
> 3) dunno. May be Thomas can give you more info.
>
> -Esteban J. Chaves
>
>
>> On Oct 6, 2016, at 5:00 AM, msnoise-request at mailman-as.oma.be wrote:
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>> Today's Topics:
>>
>>    1. new user (Flinders, Ashton)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Wed, 5 Oct 2016 13:10:53 -0700
>> From: "Flinders, Ashton" <aflinders at usgs.gov>
>> To: <msnoise at mailman-as.oma.be>
>> Subject: [MSNoise] new user
>> Message-ID:
>> 	<CAPbWHEO7J_9dyMdKJ3SQkpGy9hG7N1M-COwgzGTpkVmy85ig5g at mail.gmail.com>
>> Content-Type: text/plain; charset="UTF-8"
>>
>> Hi all, long-time obspy user new MSnoise user.
>>
>> I just had a couple quick questions I was hoping to get clarification on;
>>
>>>  From the SRL article;
>> "Once all waveforms are loaded in memory, the computation is done by
>> iteration of the station pairs, on the different components to compute and
>> the on the different filters for each defined window (30 minutes slices by
>> default)."
>>
>> 1) To be clear, the two time-series from a station-station pair are divided
>> into segments (30 minutes long, no overlap, by default), and the CC is done
>> on these segments? Are these segments then rebuilt into the daily CCF? Is
>> this segmentation purely for efficieny reasons, or is there something else
>> going on?
>>
>> 2) Why does msnoise compute_cc, not work if there is no MCWS filter defined?
>>
>> 3) Is there an intelligent way to search the mailing list archive?
>>
>> Thanks for the help!
>>
>> -ashton
>>
>>
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>> End of MSNoise Digest, Vol 31, Issue 1
>> **************************************
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