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

[David]

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 <mailto: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 <http://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 <mailto:james at artisanglobal.com> 

 

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://geohazards.usgs.gov/pipermail/realtime-feed-users/attachments/20160602/2a443368/attachment.html>