# 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. |

ACU | Continuous | N/A |

BCI | Continuous | Broadband (20 or 40 sps); Calibration input to the signal. |

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 |

BJ[ZNE] | SCEDC continuously archives: CBC, DJJB, GSA, LBW1, LBW2, MIK, RSS, FA.FABS | Broadband (20 or 40 sps); Seismic data: Rotational value for a high gain seismometer; standard convention: BL[ZNE] |

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] |

BN[1-n] | SCEDC continuously archives: CBC, DJJB, GSA, LBW1, LBW2, MIK, RSS, FA.FABS | Broadband (20 or 40 sps); Seismic data: Accelerometer; standard convention: BN[1-n] |

EH[ZNE] | Triggered | Extremely Short Period (100 sps; historic channels 62.5 sps); Seismic data; High gain; standard convention: EH[ZNE] |

EH[123] | Continuous | Extremely Short Period (100 sps; historic channels 62.5 sps); Seismic data; High gain; standard convention: EH[123] |

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] |

HJ[ZNE] | Continuous | High Broadband (80 or 100 sps); Seismic data: Rotational value of high gain seismometer; 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[123456] | Triggered | High Broadband (80 or 100 sps); Seismic data: Accelerometer; standard convention: HN[ZNE] or HN[123] |

LCE | Continuous | Long period (1 sps); Clock channel, phase error in microseconds |

LCL | Continuous | Long period (1 sps); Clock channel, lock loss in minutes |

LCQ | Continuous | Long period (1 sps); Clock channel, clock quality as a percentage (0 - 100)% |

LD[IO] | Continuous | Long period (1 sps); Pressure: barometer, or microbarometer pressure; I: inside; O: outside; LD[IO] |

LEB | Continuous | Long period (1 sps); Battery voltage |

LEC | Continuous | Long period (1 sps); Input DC current |

LEP | No | Long period (1 sps); Quanterra DC voltage |

LH[ZNE] | Continuous | Long period (1 sps); Seismic data: High gain; standard convention: LH[ZNE] |

LH[12] | 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] |

LII | Continuous | Long period (1 sps); Internal humidity of datalogger. |

LJ[ZNE] | Continuous | Long period (1 sps); Rotational value of high gain seismometer |

LKI | Continuous | Long period (1 sps); Internal temperature of data logger. |

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. |

LTW | Continuous | Long period (1 sps); Depth of water at monitoring site. |

MH[ZNE] | Continuous | Mid period (1 - 10 sps) Seismic data: High gain; standard convention: MH[ZNE] |

OCF | Continuous | Opaque configuration file for datalogger. |

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]; |

VCE | Continuous | Very long period (0.1 sps); Clock channel, phase error in microseconds |

VCO | Continuous | Very long period (0.1 sps); PLL channel, VCO value. A measure of automatic adjustment applied to the oscillator to raise or lower the clock frequency to phase lock with UTC. |

VCQ | Continuous | Very long period (0.1 sps); Clock channel, clock quality as a percentage (0-100)%. |

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] |

VEA | YES | Very long period (0.1 sps); System status channel, q330 internal temperature in degrees C. |

VEC | YES | Very long period (0.1 sps); System status channel, the current supplied to GPS antenna in milliamps. |

VEP | YES | Very long period (0.1 sps); Input DC power, available only on 730, 680 systems. |

VFP | Continuous | Very long period (0.1 sps); Quanterra free telemetry buffer; |

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 |

VK[IO] | Continuous | Very long period (0.1 sps); Temperature: Quanterra internal temperature; I: inside; O: outside; VK[IO] |

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]; |

VN[ZNE] | Continuous | Very long period (0.1 sps); Seismic data: Accelerometer; standard convention: VN[ZNE] |