[Realtime-feed-users] 2 Alaska quakes keep appearing and disappearing from 1-day geojson feed

[Fee, Jeremy]

Hello,

One of our servers had an error processing information for that event,
leading to the inconsistent feed results.  I've corrected the problem and
you should see consistent results when accessing feeds.


A couple comments about polling feeds to detect changes:

- Events usually don't reappear after being removed from feeds, but this
does happen.  More commonly, and existing event will change ids as
information is received from a preferred contributor.  You can check if
you've already processed an event by inspecting its "ids" property, which
is a comma separate list of event ids associated to an event.

- Deleted events do not appear in feeds.


Another option for triggering in response to changes is our java-based data
distribution system, which is used to populate the database behind the
feeds:

https://github.com/usgs/pdl


An example configuration that calls an external python script in response
to events being added/updated/deleted is available in this github branch:

https://github.com/jmfee-usgs/pdl-client-examples/tree/indexer



Thanks,

Jeremy



On Mon, Mar 14, 2016 at 11:58 PM, James Richards <james at artisanglobal.com>
wrote:

> Hi,
>
> Tonight I’m noticing that there are 2 earthquakes in Alaska that appear
> and disappear every few minutes from the 1-Day M 1.0+ geojson feed. These
> are:
>
> ak12977218 - a mag 2.1 located 11km SE of Y, Alaska
>
> and
>
> ak12977218 - a mag 1.6 located 93km WSW of Cantwell, Alaska
>
> This is causing our script (fortunately still in beta) that polls the
> geojson feed to resend an alert about these quakes every few minutes.
>
> Of course we can and will rewrite the script to be more resilient to this
> kind of error - but I’d like to know what caused this? Is it an anomaly or
> can we expect this kind of thing to happen again?
>
> Thank you,
> James
>
> James Richards
> Artisan Global LLC
> james at artisanglobal.com
>
>
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