Thread: fdsnws event service update time

Started: 2016-01-28 22:18:34
Last activity: 2016-01-29 02:31:01
Topics: Web Services
John West
2016-01-28 22:18:34
Approximately how long does it take between when a seismic event occurs and
when it appears on the event service? I'm sure it depends on which catalog
reports it and possibly on size, but some ballpark number would be useful
to know.

Thanks!

-- John

  • Chad Trabant
    2016-01-28 21:37:40

    Hi John,

    First, the DMC's event web service will be reduced in functionality in the near future and retired in the longer future. More on this in the next email.

    But for now here are some hand-wavy ballpark numbers:
    Event information from the USGS/NEIC PDE is loaded within minutes.
    The ISC catalog is loaded in between 1 and 2 years behind real time

    Chad

    On Jan 28, 2016, at 1:19 PM, John West <john.d.west<at>asu.edu> wrote:

    Approximately how long does it take between when a seismic event occurs and when it appears on the event service? I'm sure it depends on which catalog reports it and possibly on size, but some ballpark number would be useful to know.

    Thanks!

    -- John

    ----------------------
    Web Services (http://ds.iris.edu/message-center/topic/webservices/)

    Sent via IRIS Message Center (http://ds.iris.edu/message-center/)
    Update subscription preferences at http://ds.iris.edu/account/profile/


    • Rick DeWitt
      2016-01-28 22:53:45
      Chad,
      Following on John's question, which IRIS service provides the smallest
      latency between the time when the earth starts shaking the instrument and
      the availability of the data via IRIS? I'd like to explore that
      near-real-time realm.
      Thanks,
      Rick DeWitt


      On Thu, Jan 28, 2016 at 1:38 PM, Chad Trabant <chad<at>iris.washington.edu>
      wrote:


      Hi John,

      First, the DMC's event web service will be reduced in functionality in the
      near future and retired in the longer future. More on this in the next
      email.

      But for now here are some hand-wavy ballpark numbers:
      Event information from the USGS/NEIC PDE is loaded within minutes.
      The ISC catalog is loaded in between 1 and 2 years behind real time

      Chad

      On Jan 28, 2016, at 1:19 PM, John West <john.d.west<at>asu.edu> wrote:

      Approximately how long does it take between when a seismic event occurs
      and when it appears on the event service? I'm sure it depends on which
      catalog reports it and possibly on size, but some ballpark number would be
      useful to know.

      Thanks!

      -- John

      ----------------------
      Web Services (http://ds.iris.edu/message-center/topic/webservices/)

      Sent via IRIS Message Center (http://ds.iris.edu/message-center/)
      Update subscription preferences at http://ds.iris.edu/account/profile/


      ----------------------
      Web Services (http://ds.iris.edu/message-center/topic/webservices/)

      Sent via IRIS Message Center (http://ds.iris.edu/message-center/)
      Update subscription preferences at http://ds.iris.edu/account/profile/


      • Chad Trabant
        2016-01-29 00:06:11

        Hi Rick,

        Data is available from our fdsnws-dataselect service (http://service.iris.edu/fdsnws/dataselect/1/) as soon as it is written to the data collection buffers. Most of the near-real-time latency is due to packetizing the data in the miniSEED format where the primary factor is sample rate, the next factor is probably compressibility. In general, the higher the data rate the faster records are filled and written to the collection buffer and available. Data recorded at 40 samples/second is commonly available within 20-60s of seconds of current time.

        Most of the incoming data streams are also available from our SeedLink streaming service with the same latency governors described above:
        http://ds.iris.edu/ds/nodes/dmc/services/seedlink/

        Keep in mind that very low latency data is not the DMC's gig, i.e. not part of our mission. That being said we do the best we can to make data available as soon as we get it. Most data actively flowing to the DMC is available within minutes and that satisfies the vast majority of use cases, with earthquake early warning being an obvious exception.

        Chad

        On Jan 28, 2016, at 2:53 PM, Rick DeWitt <dewitt.rick<at>gmail.com> wrote:

        Chad,
        Following on John's question, which IRIS service provides the smallest latency between the time when the earth starts shaking the instrument and the availability of the data via IRIS? I'd like to explore that near-real-time realm.
        Thanks,
        Rick DeWitt


        On Thu, Jan 28, 2016 at 1:38 PM, Chad Trabant <chad<at>iris.washington.edu <chad<at>iris.washington.edu>> wrote:

        Hi John,

        First, the DMC's event web service will be reduced in functionality in the near future and retired in the longer future. More on this in the next email.

        But for now here are some hand-wavy ballpark numbers:
        Event information from the USGS/NEIC PDE is loaded within minutes.
        The ISC catalog is loaded in between 1 and 2 years behind real time

        Chad

        On Jan 28, 2016, at 1:19 PM, John West <john.d.west<at>asu.edu <john.d.west<at>asu.edu>> wrote:

        Approximately how long does it take between when a seismic event occurs and when it appears on the event service? I'm sure it depends on which catalog reports it and possibly on size, but some ballpark number would be useful to know.

        Thanks!

        -- John

        ----------------------
        Web Services (http://ds.iris.edu/message-center/topic/webservices/)

        Sent via IRIS Message Center (http://ds.iris.edu/message-center/)
        Update subscription preferences at http://ds.iris.edu/account/profile/


        ----------------------
        Web Services (http://ds.iris.edu/message-center/topic/webservices/)

        Sent via IRIS Message Center (http://ds.iris.edu/message-center/)
        Update subscription preferences at http://ds.iris.edu/account/profile/



      • Philip Crotwell
        2016-01-29 02:31:01
        You might consider going directly to the USGS NEIC web service. I
        doubt IRIS is much slower, but using the NEIC is as easy (actually the
        same) as IRIS, just change the host and be careful with
        catalog/contributor.

        http://earthquake.usgs.gov/fdsnws/event/1/

        List of other compatible ws are here:
        http://www.fdsn.org/webservices/datacenters/

        Philip

        On Thu, Jan 28, 2016 at 5:54 PM, Rick DeWitt <dewitt.rick<at>gmail.com> wrote:
        Chad,
        Following on John's question, which IRIS service provides the smallest
        latency between the time when the earth starts shaking the instrument and
        the availability of the data via IRIS? I'd like to explore that
        near-real-time realm.
        Thanks,
        Rick DeWitt


        On Thu, Jan 28, 2016 at 1:38 PM, Chad Trabant <chad<at>iris.washington.edu>
        wrote:


        Hi John,

        First, the DMC's event web service will be reduced in functionality in the
        near future and retired in the longer future. More on this in the next
        email.

        But for now here are some hand-wavy ballpark numbers:
        Event information from the USGS/NEIC PDE is loaded within minutes.
        The ISC catalog is loaded in between 1 and 2 years behind real time

        Chad

        On Jan 28, 2016, at 1:19 PM, John West <john.d.west<at>asu.edu> wrote:

        Approximately how long does it take between when a seismic event occurs
        and when it appears on the event service? I'm sure it depends on which
        catalog reports it and possibly on size, but some ballpark number would be
        useful to know.

        Thanks!

        -- John

        ----------------------
        Web Services (http://ds.iris.edu/message-center/topic/webservices/)

        Sent via IRIS Message Center (http://ds.iris.edu/message-center/)
        Update subscription preferences at http://ds.iris.edu/account/profile/


        ----------------------
        Web Services (http://ds.iris.edu/message-center/topic/webservices/)

        Sent via IRIS Message Center (http://ds.iris.edu/message-center/)
        Update subscription preferences at http://ds.iris.edu/account/profile/




        ----------------------
        Web Services (http://ds.iris.edu/message-center/topic/webservices/)

        Sent via IRIS Message Center (http://ds.iris.edu/message-center/)
        Update subscription preferences at http://ds.iris.edu/account/profile/


Page built 01:40:58 | v.090361a2