[Realtime-feed-users] use of minmag in FDSNWS request yields unexpected result

[Fee, Jeremy]

Hello Peter,

API responses are cached for 15 minutes, which is why it took several
minutes before a new earthquake appeared.  For near-real time information
we provide realtime feeds which use the same output formats as the API, but
are cached for shorter intervals and are limited to specific age and
magnitude combinations.

The CSV feeds on this page are only cached for 5 minutes:

http://earthquake.usgs.gov/earthquakes/feed/v1.0/csv.php


The GeoJSON feeds on this page are only cached for 1 minute:

http://earthquake.usgs.gov/earthquakes/feed/v1.0/geojson.php



Thanks,

Jeremy


On Wed, Sep 16, 2015 at 9:13 AM, Peter Schmidt <peter.schmidt at geo.uu.se>
wrote:

> Hi
>
> There seems to be something strange going on with the implementation of
> FDSNWS.
>
> For a few minutes just after a new event have been added to the catalog it
> seems that access to the data or not depends on whether or not a minimum
> magnitude is specified in the request. As an example consider catalog event
> us20003jyz:
>
> time,latitude,longitude,depth,mag,magType,nst,gap,dmin,rms,net,id,updated,place,type
> 2015-09-16T14:03:22.300Z,-6.0008,151.4536,6.27,6,mwb,,20,1.931,1.13,us,us20003jyz,2015-09-16T14:30:12.048Z,"153km
> ESE of Kimbe, Papua New Guinea",earthquake
>
> Requesting data 14:28:25 (UTC) with no minimum magnitude specified did
> indeed return the above entry, whilst requesting data 14:28:25 (UTC) with
> the minmag=4 in the request did not. In fact not until 14:34:03 (UTC) did a
> request with minmag=4 return the catalog entry (note that the magnitude of
> the event above is 2! magnitudes above minmag).
>
> Below can be seen the exact commands used, albeit slightly edited (by
> removing a few lines with no useful information).
>
> Regards Peter
>
> --
>
> ********************************************************************************
> Peter Schmidt                                      Tel: +46-18-4717104
> Swedish National Seismological Network (SNSN)   Mobile: +46-73-3190975
> Dept. of Earth Sciences:geophysics              e-mail:
> peter.schmidt at geo.uu.se
> Uppsala University
> Villavagen 16
> SE-75236 Uppsala
>
> ********************************************************************************
>
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