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:

1. the first letter specifies the sampling rate and the response band of the instrument
2. the second character identifies the sensor instrument code and
3. 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 Hz); Seismic data: High gain; standard convention: BH[ZNE]
BH[1-n]	Continuous	Broadband (20 or 40 Hz); 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 Hz); 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 Hz); Seismic data: Low gain; standard convention: BN[ZNE]
EH[ZNE]	Triggered	Extremely Short Period (100 Hz; historic channels 62.5 Hz); Seismic data; High gain; standard convention: EH[ZNE]
EL[ZNE]	Triggered	Extremely Short Period (100 Hz); Seismic data; High gain; standard convention: EL[ZNE]
HD[IO]	Triggered for: GLA, ISA, NEE, PAS, RPV, SNCC, USC	High Broadband (80 or 100 Hz); Pressure: barometer, or microbarometer pressure; I: inside; O: outside; HD[IO]
HH[ZNE]	Triggered	High Broadband (80 or 100 Hz); Seismic data: High gain; standard convention: HH[ZNE]
HL[ZNE]	Triggered	High Broadband (80 or 100 Hz); Seismic data: Accelerometer; standard convention: HL[ZNE]
HL[1-n]	Triggered	High Broadband (80 or 100 Hz); Seismic data: Accelerometer; downhole standard convention: HL[1-n]
HN[ZNE] or HN[123]	Triggered	High Broadband (80 or 100 Hz); Seismic data: Accelerometer; standard convention: HN[ZNE] or HN[123]
LD[IO]	Continuous	Long period (1 Hz); Pressure: barometer, or microbarometer pressure; I: inside; O: outside; LD[IO]
LEP	No	Long period (1 Hz); Quanterra DC voltage
LH[ZNE]	Continuous	Long period (1 Hz); Seismic data: High gain; standard convention: LH[ZNE]
LL[ZNE]	Continuous	Long period (1 Hz); Seismic data: Low gain; standard convention: LL[ZNE]
LL[1-n]	Continuous	Long period (1 Hz); Seismic data: Low gain; downhole; convention: LL[1-n]
LN[ZNE] or LN[1-n]	Continuous	Long period (1 Hz); 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 Hz); Seismic data; High gain; standard convention: SH[ZNE] *only from NC, NN, SN networks
UCD	No	Ultra Long Period (0.01 Hz); Quanterra clock drift
UCQ	No	Ultra Long Period (0.01 Hz); Quanterra clock quality
UEP	No	Ultra Long Period (0.01 Hz); Quanterra DC voltage
UF[1...n]	No	Ultra Long Period (0.01 Hz); Quanterra free telemetry buffer; UF[1...n]
UFC	No	Ultra Long Period (0.01 Hz); Quanterra clock freq control
UK2	No	Ultra Long Period (0.01 Hz); Temperature: Quanterra internal temperature
UM[ZNE] or UM[UVW]	No	Ultra Long Period (0.01 Hz); 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 Hz); Pressure: barometer, or microbarometer pressure; I: inside; O: outside; VD[IO]
VEP	No	Very long period (0.1 Hz); Input DC power, available only on 730, 680 systems.
VH[ZNE]	Continuous	Very long period (0.1 Hz); Seismic data: High gain; standard convention: VH[ZNE]
VK2	No	Very long period (0.1 Hz); Temperature: Quanterra internal temperature
VM[ZNE] or VM[UVW]	Continuous	Very long period (0.1 Hz); Mass Position; STS-1/Gurlap convention: VM[ZNE]; STS-2 convention: VM[UVW];