[Realtime-feeds] Feed JSON field question
jrhartog at uw.edu
Tue Apr 15 16:58:37 UTC 2014
For completeness sake, not only the California regional networks submit
their near-real time automatic solutions to the NEIC, several others do as
well. For example, the Pacific Northwest Seismic Network (PNSN), which
covers Washington and Oregon State also does. We do use some quality
criteria that have to be met before an automatic solution gets sent, among
other things, it has to have an initial magnitude estimate of 1 or bigger.
If it does not meet those very basic requirements, the solution won't get
sent until someone actually reviews it. Our automatic solutions should
show up within about 5 minutes of the origin time of the earthquake. We do
have fewer earthquakes than in California, so they may not show up in the
real-time feeds very frequently.
-Renate (research staff at PNSN)
On Mon, Apr 14, 2014 at 4:16 PM, Earle, Paul <pearle at usgs.gov> wrote:
> California has more seismic stations and post automatic solutions. Most
> other regions in the U.S. do not post automatics.
> On Mon, Apr 14, 2014 at 5:13 PM, Matt Keller <mattrk at mattrk.com> wrote:
>> That's exactly what I needed to know. Thanks for clearing that up.
>> Out of curiosity, do you know why the data for areas outside of
>> California is delayed up to 30 minutes while California data is posted
>> within a just a few minutes? I understand that California has more
>> earthquakes than anywhere else and needs faster notifications but i was
>> just curious why this is from a technical side. Is this data prioritized
>> somehow? Or are you simply polling that equipment more often?
>> Thanks again.
>> On Mon, Apr 14, 2014 at 9:06 AM, Martinez, Eric <emartinez at usgs.gov>wrote:
>>> Hi Matt,
>>> The time field under features > properties corresponds to the *time at
>>> which the earthquake occurred*.
>>> The updated field under features > properties corresponds to the time
>>> the most recent update arrived. This can be driven by any preferred
>>> associated product (for example, the arrival of a ShakeMap product can
>>> affect the updated property).
>>> Updated earthquakes are *not* re-added to the past hour or past day
>>> feeds. Each feed for a given time period contains earthquakes that occurred
>>> within that time period. Subsequent updates to earthquake information do
>>> not affect what earthquakes appear in the feeds.
>>> Eric Martinez
>>> U.S. Geological Survey
>>> emartinez at usgs.gov
>>> On Fri, Apr 11, 2014 at 8:07 PM, Matt Keller <mattrk at mattrk.com> wrote:
>>>> Does the time field under features > properties correspond to the
>>>> time at which the earthquake occurred or the time at which the earthquake
>>>> was posted to the feed? From what I've read, earthquakes that happen in
>>>> other parts of the country (Not California) can be posted as much as 30
>>>> minutes after the fact. I'm wondering what the time stamp actually means.
>>>> Additionally, are "updated" quakes re-added to the past hour or past
>>>> day feeds if they are updated significantly later? E.g. When a quake that
>>>> happened 26 hours ago is updated, Is that quake re-added to the past
>>>> hour/past day feed? I would assume not, but i wanted to verify. I'm
>>>> assuming that the data for that particular quake is simply updated and the
>>>> "updated" field is just incremented.
>>>> Realtime-feeds mailing list
>>>> Realtime-feeds at geohazards.usgs.gov
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Pacific Northwest Seismic Network
Department of Earth and Space Sciences
University of Washington
Seattle, WA 98195
Tel. +1-206-685-7079 (office)
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