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Changes for page AusPass Data

Last modified by robert on 2026/02/12 14:01
From version 19.1
edited by robert
on 2026/01/16 12:23
Change comment: There is no comment for this version
To version 6.1
edited by robert
on 2025/06/20 12:08
Change comment: There is no comment for this version

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17 17  
18 18  == External Network data ==
19 19  
20 -We host //some// (a lot, but not all!) complimentary data from the [[Global Seismograph Network (GSN - IU)>>https://www.fdsn.org/networks/detail/IU/]], mainly NWAO, MBWA, and CTAO.
20 +We also host //some// waveform data from GeoScience Australia's national network **AU** and the global network **IU**. This is done as a convenience to our users as much of this data is concurrent and proximal to our networks. Again we reiterate that we only host **SOME** of this data, we do not have the resources to do a full clone. If we do not have the data you're looking for, it's best to try IRIS/Earthscope. If they don't have it, you should get in touch with Geoscience Australia directly.
21 21  
22 -We also archive live streams from the Seismology Research Centre (OZ) as well as the University of Melbourne (VW).
23 -
24 24  (% class="box warningmessage" %)
25 25  (((
26 -Unfortunately, AusPass no longer hosts AU network data~-~- you will now have to get this from Earthscope/IRIS.
24 +AusPass no longer hosts AU network metadata~-~- you will have to get this from Earthscope/IRIS.
27 27  )))
28 28  
27 +[[Venn diagram of where AU network data is stored online>>image:GA_iris_auspass.png||data-xwiki-image-style-alignment="center" height="172" width="459"]]
28 +
29 +
29 29  == QA/QC ==
30 30  
31 31  Where possible, we will fix obvious timing errors such as constant time offsets and clock drifts and host the "fixed" version of the waveform data. Sometimes timing corrections cannot be reliably fixed (e.g. clocks jumping around too much intraday) and they are left as-is. Other times, issues were missed or could not be perfectly fixed. If you find any discrepancies, kindly just let us know when and where.
... ... @@ -45,28 +45,3 @@
45 45  We host copies of Geoscience Australia's global earthquake catalog which is derived exclusively from the output of the [[Earthquakes@GA>>path:https://earthquakes.ga.gov.au/]] web portal. We do this by manually downloading CSV data and converting it to Seiscomp SCXML, then importing it into our server to be accessed via FDSN as event data. Because we must do this manually, our cloned earthquake catalog is only updated monthly (usually on the 1st). Note that information such as phase arrivals is unfortunately not provided by GA.
46 46  
47 47  Soon we will also begin hosting regionally specific catalogs with full phase picks.
48 -
49 -= SmartSolo Node Polarity Issues =
50 -
51 -There has been a lot of confusion about the polarity of the IGU-16HR (1C and 3C) data, as well as the BD3C-5 data over the years. We now believe we know what's going on with certainty.
52 -
53 -(% class="box errormessage" %)
54 -(((
55 -ALL IGU-16HR channels have **negative** polarity relative to "standard" FDSNXML convention (e.g., positive down = -90 degrees, positive north = 0 degrees, positive east = 90 degrees). Freshly exported data requires a -1 multiplier to ALL channels to be "correct" relative to what you're likely expecting.
56 -)))
57 -
58 -(% class="box infomessage" %)
59 -(((
60 -BD3C-5 channels are "normal" and consistent with usual high gain seismometers. These sensors do not require any polarity flips.
61 -)))
62 -
63 -After much consternation was have finally tested this ourselves in a controlled environment and are now certain the above notices to be correct. Other researchers have demonstrated the same:
64 -
65 -[[Arrivals showing the polarity of various instrument types (courtesy of the China Earthquake Administration). Note that the IGU-16HR3C (labelled HR3C) are inverted relative to the BD3C and CMG40T. >>image:Weixin Image_20260115150150_19_1185.png||alt="Arrivals showing various sensors. The HR3C channels are inverted."]]
66 -
67 -As of December 2025, all waveform data on AusPass are now corrected.
68 -
69 -Previously it was understood that only the "Z" channel data on the IGU-16HRs was incorrect. It is unclear how other agencies handle this, so for that reason we do not advise mixing up response information from what is provided on AusPass. It is possible that other groups account for this by adding a multiplier in the metadata and not by editing the waveform data.
70 -
71 -
72 -
Weixin Image_20260115150150_19_1185.png
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1 -XWiki.robert
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