Why are some data restricted from open access? [Article]
Data from PASSCAL (and some other temporary deployments) are subject to a two-year moratorium, allowing the Principal Investigators (PI's) who carried out the scientific study the opportunity to repor...
- How do I request restricted data? [Article]
First, you must contact one of the experiment's principal investigators (PIs) and get a password for an email address that you supply. You can find the names of participating PIs by viewing
- What is Restricted Data? [Article]
Q: What is Restricted Data? A: An important function of the DMC is to collect data, sort it, and make it readily available to a wider research community, especially with short-
- How do I decrypt restricted data? [Article]
IRIS routinely distributes restricted data sets to authorized users in encrypted format to ensure th...
- Is it possible to specify my own sample rate? [Article]
USArray TA stations have several seismic channels available with different sample rates. The BH[ENZ] channels are 40 samples per second (sps or hz) and the LH[ENZ] channels are 1 sps. Some stations
- I see curious transient signals in the data – what are they? [Article]
There are many causes for transient signals. Long period transient signals can be caused by vault tilt (often resulting from weather systems or freezing/thawing ground), or local disturbances such as ...
- What are the standard USArray TA station channels? [Article]
- I want to create a display in our lobby – can I get data from the USArray TA sta... [Article]
...IRIS Data page is a good starting point for exploring the multiple methods available for requesting data. Nea
- Do the USArray TA data contain calibration signals? If so, when and where are th... [Article]
Calibrations on USArray TA data are run within a few days to weeks after sensor installation and before sensor removal (if possible). The signal looks like large amplitude white noise with an abrupt
- Does anyone pick phase arrivals for USArray TA data? Is there an earthquake bull... [Article]
Phase picks on the USArray TA data are made by analysts at the Earthscope Array Network Facility (ANF). These ANF Event Bulletins are available as Searchable Product Depository (
- Where can I get the instrument responses for USArray TA stations? [Article]
Response files can be obtained from IRIS by several different methods. A few of the more common ones include: 1. as part of a SEED file. SEED files can be obtained through any of the
- Can I get USArray TA data in real time? [Article]
The
- How accurate are the station latitudes and longitudes? [Article]
USArray TA station coordinates are measured by handheld GPS and reported to five decimal places of precision. IRIS DMC internally can store up to six decimal places of precision for latitude
- How do I obtain data from TA stations? [Article]
Data from TA stations can be obtained by using any of the IRIS data request methods (www.iris.edu/data/using.htm). More information
- I want to look at an earthquake that happened yesterday. How long do I have to w... [Article]
The USArray Transportable Array data usually arrive at the DMC in near real-time, within seconds or minutes, and are immediately available from via request mechanisms. Shortly after an
- Someone told me the USArray TA data has gaps. Is that true? [Article]
It is not uncommon for seismic data in general to include some gaps. With modern equipment and station design, gaps in seismic time series can be significantly reduced or even eliminated
- I requested some USArray TA data and received multiple copies of the same data. ... [Article]
The IRIS DMC normally receives two copies of Transportable Array data, the real-time telemetred copy and a later "final" copy. In some cases a third copy of data is recieved that fills i
- What happens after the USArray TA reaches the east coast? [Article]
The USArray Transportable Array (TA) is a set o
- Do all SAC responses have one additional zero? [Article]
Q: I see that the instrument response in RESP and SAC file formats is slightly different in the Poles and Zeroes section. In the SAC file, there is an additional "one zero". Is the SAC res
- Is there a limit on the number of lines I can have in a BREQ_FAST request? Limi... [Article]
...: 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 answerin
