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Changes for page Seismometers

Last modified by robert on 2026/01/15 17:32
From version 51.1
edited by robert
on 2026/01/15 17:05
Change comment: There is no comment for this version
To version 48.1
edited by santi
on 2025/07/23 15:43
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. 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 120s, Trillium Compact 20s, 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 15  === Trillium Compact 120s ===
16 16  
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46 46  
47 47  The LE-3D Lite 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>>doc:Instrumentation.SmartSolo Nodes.WebHome]].
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" %)