[Realtime-feed-users] Duplicate Fiji earthquakes last night

[Fee, Jeremy]

Hello,

The expected behavior is for the contributions to automatically associate
into the same event.  When they do not automatically associate, we manually
correct the problem so the catalog is accurate.


Thanks,

Jeremy


On Thu, Jun 2, 2016 at 4:06 AM, David <dloring at eircom.net> wrote:

> Except that this happens all the time Jeremy, not for very long granted
> but when any large event occurs the pt version is often hanging around
> after the us version has been promulgated.
>
>
>
> It is not a problem as I/we have been aware of this for many years.
>
>
>
> Regards
>
> David
>
>
>
> *From:* Realtime-feed-users [mailto:
> realtime-feed-users-bounces at geohazards.usgs.gov] *On Behalf Of *Fee,
> Jeremy
> *Sent:* 01 June 2016 17:56
> *To:* James Richards <james at artisanglobal.com>
> *Cc:* <realtime-feed-users at geohazards.usgs.gov> <
> realtime-feed-users at geohazards.usgs.gov>
> *Subject:* Re: [Realtime-feed-users] Duplicate Fiji earthquakes last night
>
>
>
> Hello,
>
>
>
> This was due to an error in one of the messages from the National Tsunami
> Warning Center, which prevented the automatic association of events.  They
> are aware of the problem and have taken steps to prevent it in the future.
>
>
>
> Here is the partial timeline:
>
>
>
> 2016-05-28T05:38:51.430Z origin time
>
>
>
> 2016-05-28T05:44:56.000Z PT solution
>
> Event added, PT solution is most preferred.
>
> latitude = -21.961
>
> longitude = -177.862
>
> magnitude = 6.6 Mi
>
> time = 2016-05-28T05:38:49.000Z
>
>
>
> 2016-05-28T05:49:30.999Z AT solution with rounding problem
>
> Event updated, AT solution is most preferred (neither AT and PT are
> authoritative, and AT contributed most recently)
>
> latitude = -22
>
> longitude = -177
>
> magnitude = 6.6 Mi
>
> time = 2016-05-28T05:38:50.000Z
>
>
>
> 2016-05-28T05:56:54.040Z US solution
>
> Event added, US solution is most preferred (US and AT solutions outside
> automatic association window of 16s and 100km)
>
> latitude = -22.0213
>
> longitude = -178.1606
>
> magnitude = 6.6 Mwp
>
> time = 2016-05-28T05:38:51.430Z
>
>
>
> 2016-05-28T06:27:36.324Z AT solution deleted
>
> PT and US solutions automatically merged, US solution is most preferred.
>
>
>
>
>
> Thanks,
>
>
>
> Jeremy
>
>
>
>
>
> On Sat, May 28, 2016 at 9:20 AM, James Richards <james at artisanglobal.com>
> wrote:
>
> Hi Jeremy,
>
>
>
> Friday night at around 10:45 - 11:00 pm Pacific Time, I observed that two
> earthquakes were appearing separately in the real time data feed located SE
> of Fiji. The associated quake IDs were pt16149050 and us20005yqp. A short
> time later the quake with ID pt16149050 disappeared from the feed and was
> instead listed as an alternate quake ID in the ids property for us20005yqp.
>
>
>
> Can you tell us anything about what caused this, and what the proper
> terminology is for such occurrences? For example, is this what you would
> call a “ghost” event?
>
>
>
> Also, is there an errata associated with the real time feeds where we can
> verify any mistaken events that may have been reported and withdrawn? I
> couldn’t find anything on earthquake.usgs.gov about that particular quake
> pt16149050 being in error.
>
>
>
> Thanks in advance!
>
>
>
> Kind regards,
>
> James
>
>
>
> James Richards
> Artisan Global LLC
>
> james at artisanglobal.com
>
>
>
>
>
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