IRIS Knowledge Base

Category » Data

There were 29 articles found in this category:

1. Is there a limit on the number of lines I can have in a BREQ_FAST request? Limit on the size of data?
   Q: Is there a limit on the number of lines I can have in a BREQ_FAST request? Limit on the size of data? A: There are a number of variables that will contribute to answering your question. Here are a general set of guidelines which should help you to generate BREQ_FAST-style requests that wi ...
2. Does IRIS support any simple ASCII data formats that contain timeseries data?
   Q: Does IRIS support any simple ASCII data formats that contain timeseries data? A: Yes. IRIS now provides as an alternative output two forms of columnar text representations of data. Currently, IRIS web services and rdseed can write out miniSEED data as ASCII. An example is shown below. Plea ...
3. What are Data Products?
   Data products derived from raw data are produced both by the scientific community and the IRIS DMC. These complement the simple data products based on raw data by providing graphs, calculations, visualizations, and animations that enhance the collective value of the data stored at IRIS DMC, reve ...
4. Searchable Product Archive and Discovery Engine (SPADE) -- RETIRED
   NOTICE: As of August 31, 2011, SPADE has been retired from service, now replaced by the SPUD web interface, which takes on SPADE's former role of providing easy access to numerous data products. Go to SPUD to learn more information about this tool.
5. Delayed exports from seedlink
   Q: At the moment, a station I am observing with seedlink will have delays of just a couple of minutes, but this afternoon I was seeing delays closer to 10 minutes. I am pretty naive on this subject, but from my Earthworm and Antelope experiences I don't see why data should ever be more than may ...
6. I think my data looks funny and none of these other questions address my problem. Who can I ask?
   The general place to post questions about data is the data-issues mailing list. If a question posted to this list cannot be answered by the list members, an IRIS DMC staff member will either directly notify or re-direct the reporter to the appropriate network operator for the data in question.
7. What are Channel Codes?
   Channel Codes: The Channel Code is a 3-character code that specifies the type, bandwidth of the recorded signal, and orientation of the sensor. For instance, a channel code of BHZ is used to indicate the signal came from a broadband (B), high gain seismometer (H) and is recording ground motion ...
8. What is SEED?
   What is SEED? The Standard for the Exchange of Earthquake Data (SEED) is an international standard format for the exchange of digital seismological data. SEED was designed for use by the earthquake research community, primarily for the exchange between institutions of unprocessed earth motion da ...
9. What is MiniSEED?
   This is a stripped down version of SEED data which only contains waveform data. There are no detailed metadata on the station instrumentation present, which can be supplied by a supplementary dataless SEED file. Getting a MiniSEED file: 1. Submit a BREQ_FAST style request to miniseed@iris.washin ...
10. Does IRIS perform quality assurance on the data it receives?
    A: Yes. IRIS DMC developed the QUACK system to perform metrics-based quality assurance logging on near-real time data feeds buffered at IRIS DMC. With QUACK, you can browse statistics by network and station as well as by a span of time, where appropriate. QUACK also provides a query-oriented r ...
11. How can I find out about IRIS Web Services?
    A: A complete list of services and information can be found at the IRIS Web Services home page: http://www.iris.edu/ws
12. Cannot find origin time in SAC header
    Q: I requested some sac files using Wilber II. I noticed that the time following the "KZTIME" header in the sac file is different from the origin time of the event that I requested. There are no other headers indicating the origin time. May you please let me know why this is happening and how d ...
13. What are the port numbers used by DHI at IRIS DMC?
    DHI Server machine port IRIS NameServer dmc.iris.washington.edu 6371 IRIS_NetworkDC dhiserv.iris.washington.edu 6381 IRIS_EventDC dhiserv.iris.washington.edu 6382 IRIS_PondDataCenter dhiserv.iris.washington.edu 1760 ...
14. seed2db problems with new SEED volumes
    Q: The Seed2db program seems to have broke as of last week on new DMC issued SEED volumes. Do you know if the new Antelope 5.0 64 bit version will fix the broken Seed2db program ? A: As I understand it the latest Antelope still has problems reading the DMC's new SEED volumes with seed2db. The ...
15. Can no longer get BHE or BHN channels
    Q: I am curious if there was a problem with the BHE and BHN components of station PAYG as part of the IU network? I requested to download data yesterday and the BHZ channel shows data through 2010.180 but the BHE and BHN channels only show data up to 2010.107. Also there appears to be two BHZ ...
16. Including IRIS-provided data in sample code
    Q: I'm using a single three-channel seismic recording of one earthquake to include in a MATLAB code distribution. I just want to know if it's OK to include the sample dataset in my MATLAB package. A: In general, the data at IRIS DMC is considered open for your use. Please be sure to cite tha ...
17. Citation of data provided by IRIS
    Q: I downloaded some data from IRIS DMC and I would like to include this data on my website as I will be using it in an upcoming paper. I couldn't find any information on the data rights or ownership on IRIS web site. Is it okay to redistribute this data and how do I carry out the citations? ...
18. Downloading data from the IRIS DMC using FTP or HTTP robustly
    It is common to download data using either FTP or HTTP from the IRIS DMC. Most of these downloads are completed quickly and without interruption. On occasion, a user's connection to the DMC is broken before the download is complete. This can be due to system problems at the user's end, networ ...
19. What channels are available and what channels should I request?
    Q: What channels are available and what channels should I request? A: There are a number of tools you can use to get channels that are available for a given station. An easy path is to use MDA to discover which channels are operating for a station at a particular time. You can also check for d ...
20. I requested some data and got a file back that I can't read. What do I do with this file?
    Q: I requested some data and got a file back that I can't read. What do I do with this file? A: It is first necessary to identify what kind of file this is. Look for an extension or suffix Many times, a file will have a suffix on it, like .txt, to indicate the type of file. IRIS will typically ...