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Changes for page AusPass Data

Last modified by robert on 2026/02/12 14:01
From version 11.1
edited by robert
on 2025/08/19 08:23
Change comment: There is no comment for this version
To version 16.1
edited by robert
on 2026/01/16 11:34
Change comment: There is no comment for this version

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23 23  
24 24  (% class="box warningmessage" %)
25 25  (((
26 -NOTE AusPass no longer hosts AU network metadata~-~- you will have to get this from Earthscope/IRIS.
26 +Unfortunately, AusPass no longer hosts AU network data~-~- you will now have to get this from Earthscope/IRIS.
27 27  )))
28 28  
29 29  == QA/QC ==
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46 46  
47 47  Soon we will also begin hosting regionally specific catalogs with full phase picks.
48 48  
49 -= SmartSolo Node Z Polarity bug =
49 += SmartSolo Node Polarity Issues =
50 50  
51 -In[[ late 2023 it was discovered>>https://epic.earthscope.org/content/smartsolo-archives-flipped-polarity-igu-16hr-3c-5hz]] that the vertical Z channel of **both the IGU-16HR and BD3C-5 **SmartSolo nodes is actually inverted relative to the standard expectation of "positive up" (vertical axis dip = -90). EarthScope's solution was to add a -1 multiplier to the //response data.// Because we have a much smaller volume of this data to fix, and far less of it already distributed prior to this announcement, we have opted to do the opposite; e.g. we invert the //raw data// because the data is what is wrong; not the response.
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.
52 52  
53 -As such,
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 relative to be "correct" relative to what you're likely expecting.
56 +)))
54 54  
55 -{{warning}}
56 -Do not mix up EarthScope's or the IRIS-NRL node response data with those available at AusPass. Theirs will likely be inverted relative to our data!
57 -{{/warning}}
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 +)))
58 58  
63 +After much consternation was have finally tested this ourselves in a controlled environment, and have also consulted various agencies. We are now certain the above notices to be correct. Other researchers have demonstrated the same, e.g. the below.
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 data on AusPass is now correct. Previously it was understood that only the "Z" channel data on the IGU-16HRs was incorrect. It is unclear how other agencies handle this, but 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.
68 +
59 59  
70 +
71 +
Weixin Image_20260115150150_19_1185.png
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1 +XWiki.robert
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