[dhi-servers] PREF catalog in IRIS_EventDC

[Philip Crotwell]

Hi Sue

My understanding from way back when Sandy created the original iris  
eventdc, was that the PREF catalog was more of a rule of thumb than  
anything real. PREF meant something like NEICALRT for the first 2  
weeks, then QED for the next 4 weeks, then WHDF for a month or so,  
then MHDF, and finally after 2 years have passed ISCCD. This gave an  
easy way for users to generally get the "best" event location,  
without getting a lot of duplicates. I did not depend on any event  
grouping. Is this not how PREF works?

thanks,
Philip

On Sep 5, 2007, at 10:48 AM, Sue Schoch wrote:

> Morning Philip,
>
> In our current event scheme, we do not try to associate events.   
> That means that an event must have the exact same time for the  
> order of precedence to come into play.  In the case below, you can  
> see that the times are different.  The preferred catalog will  
> actually return both the NEICALRT and MHDF catalogs as the times  
> are different so it thinks these are different events.
>
> We are working on a new event scheme which will do event  
> associations, assigning one as primary.  This is in the preliminary  
> stages and will not be available for a while yet.
>
> Sue
>
> On Sep 5, 2007, at 10:19 AM, Philip Crotwell wrote:
>
>>
>> Probably should give you the event info I get from DHI. Query is  
>> for just 2006-7-17, mag > 7,
>>
>> With catalog=PREF:
>> time, latitude, longitude, depth, depthUnits, magnitude,  
>> magnitudeType, magnitudeContributor, catalog, contributor, name,  
>> flinnEngdahlRegion, flinnEngdahlRegionType
>> 2006-07-17T08:19:25.000Z, -9.334, 107.2629, 10.0, kiloMETER, 7.7,  
>> MO, NEIC, NEICALRT, NEIC, 13685414, 282, 1
>>
>> With catalog=MHDF
>> time, latitude, longitude, depth, depthUnits, magnitude,  
>> magnitudeType, magnitudeContributor, catalog, contributor, name,  
>> flinnEngdahlRegion, flinnEngdahlRegionType
>> 2006-07-17T08:19:26.680Z, -9.284, 107.419, 20.0, kiloMETER,  
>> 6.1:7.2:7.7:7.2, MB:MS:MW:MW, NEIC:NEIC:HRV:NEIC, MHDF, NEIC,  
>> 13902698, 282, 1
>>
>> thanks,
>> Philip
>>
>> On Sep 5, 2007, at 10:02 AM, Philip Crotwell wrote:
>>
>>>
>>> Hi
>>>
>>> I just sent in a query for events on 2006-7-17 (over a year ago)  
>>> using the PREF catalog. The event I got back had a preferred  
>>> origin in the NEICALRT catalog. I did a similar query (I think)  
>>> via seismoquery using the PREFERRED catalog and got back an event  
>>> in the MHDF catalog.
>>>
>>> Any idea of why these would be different? I would expect that  
>>> NEICALRT should only be "preferred" right after the event, to be  
>>> superseded by the weekly and then the monthly.
>>>
>>> thanks,
>>> Philip
>>> _______________________________________________
>>> dhi-servers mailing list
>>> dhi-servers at iris.washington.edu
>>> http://www.iris.washington.edu/mailman/listinfo/dhi-servers
>>
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