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Changes for page AusPass Data

Last modified by robert on 2026/02/12 14:01
From version 17.1
edited by robert
on 2026/01/16 11:35
Change comment: There is no comment for this version
To version 19.1
edited by robert
on 2026/01/16 12:23
Change comment: There is no comment for this version

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52 52  
53 53  (% class="box errormessage" %)
54 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.
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 56  )))
57 57  
58 58  (% class="box infomessage" %)
... ... @@ -60,11 +60,13 @@
60 60  BD3C-5 channels are "normal" and consistent with usual high gain seismometers. These sensors do not require any polarity flips.
61 61  )))
62 62  
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.
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 64  
65 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 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.
67 +As of December 2025, all waveform data on AusPass are now corrected.
68 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.
69 69  
71 +
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