Station Information
Seed Channel Descriptions
The SCEDC identifies data streams using the Standard for the Exchange of Earthquake Data (SEED) channel-naming format. The SEED format uses three letters to name seismic and auxiliary channels where:
- the first letter specifies the sampling rate and the response band of the instrument
- the second character identifies the sensor instrument code and
- the third letter indicates the physical orientation of the channel
For a more detatailed description of the SEED convention, kindly refer to Appendix A of the SEED manual, maintained and distributed by IRIS.
A brief description of the SEED channels acquired by the SCSN and their respective SCEDC archiving status is outlined below.
| SEED Channel | Data Center Archive | Description |
|---|---|---|
| ACE | No | Administrative clock error. A text-based message detailing clock quality changes. |
| BH[ZNE] | Continuous | Broadband (20 or 40 sps); Seismic data: High gain; standard convention: BH[ZNE] |
| BH[1-n] | Continuous | Broadband (20 or 40 sps); Seismic data: High gain; downhole; convention: BH[1-n] * lower numbers are lower in the hole, typically 123 is at the bottom, 456 mid-hole and 789 top of hole |
| BL[ZNE] | SCEDC continuously archives: CBC, DJJB, GSA, LBW1, LBW2, MIK, RSS, FA.FABS | Broadband (20 or 40 sps); Seismic data: Low gain; standard convention: BL[ZNE] |
| BN[ZNE] | SCEDC continuously archives: CBC, DJJB, GSA, LBW1, LBW2, MIK, RSS, FA.FABS | Broadband (20 or 40 sps); Seismic data: Low gain; standard convention: BN[ZNE] |
| EH[ZNE] | Triggered | Extremely Short Period (100 sps; historic channels 62.5 sps); Seismic data; High gain; standard convention: EH[ZNE] |
| EL[ZNE] | Triggered | Extremely Short Period (100 sps); Seismic data; High gain; standard convention: EL[ZNE] |
| HD[IO] | Triggered for: GLA, ISA, NEE, PAS, RPV, SNCC, USC | High Broadband (80 or 100 sps); Pressure: barometer, or microbarometer pressure; I: inside; O: outside; HD[IO] |
| HH[ZNE] | Triggered | High Broadband (80 or 100 sps); Seismic data: High gain; standard convention: HH[ZNE] |
| HL[ZNE] | Triggered | High Broadband (80 or 100 sps); Seismic data: Accelerometer; standard convention: HL[ZNE] |
| HL[1-n] | Triggered | High Broadband (80 or 100 sps); Seismic data: Accelerometer; downhole standard convention: HL[1-n] |
| HN[ZNE] or HN[123] | Triggered | High Broadband (80 or 100 sps); Seismic data: Accelerometer; standard convention: HN[ZNE] or HN[123] |
| LD[IO] | Continuous | Long period (1 sps); Pressure: barometer, or microbarometer pressure; I: inside; O: outside; LD[IO] |
| LEP | No | Long period (1 sps); Quanterra DC voltage |
| LH[ZNE] | Continuous | Long period (1 sps); Seismic data: High gain; standard convention: LH[ZNE] |
| LL[ZNE] | Continuous | Long period (1 sps); Seismic data: Low gain; standard convention: LL[ZNE] |
| LL[1-n] | Continuous | Long period (1 sps); Seismic data: Low gain; downhole; convention: LL[1-n] |
| LN[ZNE] or LN[1-n] | Continuous | Long period (1 sps); Seismic data: Low gain; standard convention: LN[ZNE] or LN[1-n] |
| LOG | No | Datalogger-generated log messages related to operation, event detection and clock information. This channel is generally the definitive reference for datalogger diagnostic issues; qlog application will convert to text output. |
| SH[ZNE] | Triggered | Short Period (50 sps); Seismic data; High gain; standard convention: SH[ZNE] *only from NC, NN, SN networks |
| UCD | No | Ultra Long Period (0.01 sps); Quanterra clock drift |
| UCQ | No | Ultra Long Period (0.01 sps); Quanterra clock quality |
| UEP | No | Ultra Long Period (0.01 sps); Quanterra DC voltage |
| UF[1...n] | No | Ultra Long Period (0.01 sps); Quanterra free telemetry buffer; UF[1...n] |
| UFC | No | Ultra Long Period (0.01 sps); Quanterra clock freq control |
| UK2 | No | Ultra Long Period (0.01 sps); Temperature: Quanterra internal temperature |
| UM[ZNE] or UM[UVW] | No | Ultra Long Period (0.01 sps); Mass Position; STS-1/Gurlap convention: UM[ZNE]; STS-2 convention: UM[UVW]; |
| VD[IO] | Continuous only if LD_ not available | Very long period (0.1 sps); Pressure: barometer, or microbarometer pressure; I: inside; O: outside; VD[IO] |
| VEP | YES | Very long period (0.1 sps); Input DC power, available only on 730, 680 systems. |
| VH[ZNE] | Continuous | Very long period (0.1 sps); Seismic data: High gain; standard convention: VH[ZNE] |
| VK2 | No | Very long period (0.1 sps); Temperature: Quanterra internal temperature |
| VM[ZNE] or VM[UVW] | Continuous | Very long period (0.1 sps); Mass Position; STS-1/Gurlap convention: VM[ZNE]; STS-2 convention: VM[UVW]; |
