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Changes for page Seismometers

Last modified by robert on 2026/01/15 17:32
From version 52.1
edited by robert
on 2026/01/15 17:32
Change comment: There is no comment for this version
To version 46.1
edited by santi
on 2025/07/23 11:00
Change comment: There is no comment for this version

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Author
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1 -XWiki.robert
1 +XWiki.santi
Content
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4 4  (((
5 5  = Broadband sensors =
6 6  
7 -Broadband (or BB) sensors are especially sensitive to low-frequency energy and are //broad//ly defined as any instrument capable of **reliably recording wave periods greater or equal to 10 seconds**. This makes them useful for the analysis and detection of teleseismic earthquakes as well as techniques involving ambient noise. The downside to broadband sensors is usually their cost, size, and fragility relative to short-period sensors.
7 +Broadband (or BB) sensors are especially sensitive to low-frequency energy and are //broad//ly defined as any instrument capable of **reliably recording wave periods greater or equal to 10 seconds**. This makes them useful for the analysis and detection of teleseismic earthquakes as well as techniques involving ambient noise. However, they are also well-suited for measuring high-frequency energy, limited only by the Nyquist frequency of the [[data logger>>doc:Instrumentation.ANU LPR-200.WebHome]]'s sampling rate. The downside to broadband sensors is usually their cost, size, and fragility relative to short-period sensors.
8 8  
9 -Broadband sensors are not especially suited for very high frequency analysis as most tend to have an upper sensitivity limit of ~~100 Hz (e.g. achievable via 200 Hz sample rate). For this reason **we do not recommend people record data above 250 Hz** as it is wasteful. If you need to reliably measure energy above 100 Hz one of the SmartSolo nodes is more suitable.
10 -
11 11  == Nanometrics ==
12 12  
13 -Currently, four kinds of Nanometrics broadband seismic sensors are available. The Trillium Compact 120s, Trillium Compact 20s, Trillium Compact Posthole, and the Trillium Compact Horizon. These seismometers are ideal for long-term deployments of multiple months. All of these seismometers are compatible with the LPR-200 and TSAWR loggers and are designed for low energy consumption.
11 +Currently, 4 kinds of nanometric broadband seismic sensors are available. The Trillium Compact 120, Trillium Compact 20, Trillium Compact Posthole, and most recently, the Trillium Compact Horizon. These seismometers are ideal for long-term deployments of multiple months. All of these seismometers are compatible with the LPR-200 and TSAWR loggers and are designed for low energy consumption.
14 14  
15 -=== Trillium Compact 120s ===
13 +=== Trillium Compact 120 ===
16 16  
17 -The Trillium Compact 120s has sensitivity band between 120 seconds and 100 Hz but is prone to corrosion when buried for long periods. They have a tilt tolerance of ~~10° but come with adjustable feet for leveling.
15 +The Trillium Compact 120 has sensitivity band between 120 seconds and 100 Hz but is prone to corrosion when buried for long periods. They have a tilt tolerance of ~~10° but come with adjustable feet for leveling.
18 18  
19 19   For more information, refer to the [[Nanometrics Trillium Compact information sheet>>https://nanometrics.ca/hubfs/Downloads/Data%20Sheets/trillium_compact.pdf?hsLang=en-ca]]
20 20  
21 -=== Trillium Compact 20s ===
19 +=== Trillium Compact 20 ===
22 22  
23 -The Trillium Compact 20s looks identical to the Trillium Compact 120s and has a recording range between 20 seconds and 100 Hz. but is prone to corrosion when buried for long periods. They have a tilt tolerance of ~~10° but come with adjustable feet for leveling.
21 +The Trillium Compact 20 looks identical to the Trillium Compact 120 and has a recording range between 20 seconds and 100 Hz. but is prone to corrosion when buried for long periods. They have a tilt tolerance of ~~10° but come with adjustable feet for leveling.
24 24  
25 25  For more information, refer to the [[Nanometrics Trillium Compact information sheet>>https://nanometrics.ca/hubfs/Downloads/Data%20Sheets/trillium_compact.pdf?hsLang=en-ca]]
26 26  
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32 32  
33 33  === Trillium Compact Horizon ===
34 34  
35 -The Trillium Compact Horizon is sort of a mix between the Posthole and Compact 120, ideal for shallow direct bury deployments or instances where packing weight and size is an important consideration. Its response and sensitivity is identical to the Trillium Compact 120s.
33 +The Trillium Compact Horizon is sort of a mix between the Posthole and Compact 120, ideal for shallow direct bury deployments or instances where packing weight and size is an important consideration. Its response and sensitivity is identical to the Trillium Compact 120.
36 36  
37 37  === SmartSolo Broadbands ===
38 38  
39 -Two types of SmartSolo brand seismometers are currently available, one of which is a broadband seismometer. More information is available on the [[SmartSolo Seismometers page>>doc:Instrumentation.SmartSolo Nodes.WebHome]].
37 +Two types of SmartSolo brand seismometers are currently available, one of which is a broadband seismometer. More information is available on the SmartSolo Seismometers page.
40 40  
41 41  = Short period sensors =
42 42  
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44 44  
45 45  === Lennartz Electronic LE-3D Lite (MkII) ===
46 46  
47 -The LE-3D Lite are small, robust, short period sensors with a a corner period of 1 second.
45 +The LE-3D Lites are small, robust, short period sensors with a a corner period of 1 second.
48 48  
49 -=== SmartSolo BD3C-5 ===
47 +=== SmartSolo Short periods ===
50 50  
51 -Sometimes erroneously referred to as a "broadband node", the larger cylinder-shaped BD3C-5 is technically a //short period //instrument as it has a corner period of 5 seconds (< 10). It is still a high gain seismometer however (e.g. channels ?H[NEZ]). More information is available on the [[SmartSolo Seismometers page>>doc:Instrumentation.SmartSolo Nodes.WebHome]].
49 +Two types of SmartSolo brand seismometers are currently available, one of which is a short-period seismometer with corner frequency of 5 Hz. More information is available on the SmartSolo Seismometers page.
52 52  
53 -== Geophone Sensors ==
54 54  
55 -"Geophones" are technically "very short period", with corner frequencies >= 5 Hz. ANSIR currently have two geophone-type sensors available for loan: the 3-Channel SmartSolo IGU-16HR and 1-Channel SmartSolo IGU-16, both with 5 Hz (0.2 second) corners.
56 -
57 -The center character in the channel codes should be "P", e.g. DPN, DPE, DHZ for 250 Hz.
58 -
59 -(% class="box warningmessage" %)
60 -(((
61 -Note that SmartSolo branded geophone channels have inverted polarity relative to traditional standards!!! This applies only to the IGU-16HR instruments and NOT the BD3C-5 instruments.
62 -)))
63 -
64 64  = Channel and Instrument conventions =
65 65  
66 66  We follow FDSN guidelines for sensor channel and type naming conventions, outlined at [[SAGE / IRIS>>https://ds.iris.edu/ds/nodes/dmc/data/formats/seed-channel-naming/]] and also copied below:
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82 82  |P|On the order of 0.1 to 1 day ^^1^^|≥ 0.00001 to < 0.0001|
83 83  |T|On the order of 1 to 10 days ^^1^^|≥ 0.000001 to < 0.00001|
84 84  |Q|Greater than 10 days ^^1^^|< 0.000001|
73 +|A|Administrative Instrument Channel|variable|NA
74 +|O|Opaque Instrument Channel|variable|NA
85 85  )))
86 86  
87 87  (% class="col-xs-12 col-sm-4" %)
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92 92  
93 93  (% class="box" %)
94 94  (((
95 -== Trillium Compact 120s ==
85 +== Trillium Compact 120 ==
96 96  
97 97  [[image:Trillium compact120.jpg]]
98 98  
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104 104  
105 105  (% class="box" %)
106 106  (((
107 -== Trillium Compact PostHole 120s ==
97 +== Trillium Compact PostHole 120 ==
108 108  
109 109  [[image:Trillium compact posthole.jpg]]
110 110