The selected seismometer channel option is applied before receiving the data from IRIS:

The Seismometer Channel Option allows you to specify which channel(s) you would like to receive data for. An explanation of seismometer channel codes can be found on the IRIS website here: https://ds.iris.edu/ds/nodes/dmc/tools/data_channels/#. In the channel code the last value represents sensor orientation, where N/E are the North/East cardinal directions and Z is vertical. 1/2/3 are non-cardinal orientations, which generally occur in seismometer data when an instrument is deployed that is not correctly aligned with geographic North or is horizontally tilted.


Here are the options:

Vertical Velocity (High-Rate/Low-Rate Overlaid In Plots): High-rate and low-rate vertical velocity data will be overlaid and plotted on one graph. For broadband seismometers, this will be H- or C-band for the high-rate channel and M- or L-band for the low-rate channel depending on the requested time range. For short period seismometers, this will be high-rate E-band and low-rate M- or L-band.

Oceans 3.0 API filter: dpo_seismometerChannel=*Z

High-Rate Vertical Velocity: High-rate vertical velocity data will be plotted on one graph. For broadband seismometers, this will be H- or C-band. For short period seismometers, this will be E-band.

Oceans 3.0 API filter: dpo_seismometerChannel=HHZ

Low-Rate Vertical Velocity: Low-Rate vertical velocity data will be plotted on one graph. For broadband and short period seismometers, this will be M- or L-band depending on the requested time range.

Oceans 3.0 API filter: dpo_seismometerChannel=MHZ

High-Rate Velocity - All Components: All high-rate velocity data will be plotted on separate graphs. For broadband seismometers this will be H- or C-band. For short period seismometers this will be E-band.

Oceans 3.0 API filter: dpo_seismometerChannel=HH*

Low-Rate Velocity - All Components: All low-rate velocity data will be plotted on separate graphs. For broadband and short period seismometers this will be M- or L-band.

Oceans 3.0 API filter: dpo_seismometerChannel=MH*

Horizontal Acceleration (High Rate/Low Rate Overlaid in Plots): High-rate and low-rate horizontal acceleration data will be plotted and overlaid on one graph, where high-rate will be C- or H-band and low-rate will be M-band.

Oceans 3.0 API filter: dpo_seismometerChannel=*N12

High-Rate Horizontal Acceleration: High-rate horizontal acceleration data will be plotted on one graph for C- or H-band.

Oceans 3.0 API filter: dpo_seismometerChannel=CN12

Low-Rate Horizontal Acceleration: Low-rate horizontal acceleration data will be plotted on one graph for M-band.

Oceans 3.0 API filter: dpo_seismometerChannel=MN12

High-Rate Acceleration - All Components: All high-rate acceleration data will be plotted on separate graphs for C- or H-band.

Oceans 3.0 API filter: dpo_seismometerChannel=CN*

Low-Rate Acceleration - All Components: All low-rate acceleration data will be plotted on separate graphs for M-band.

Oceans 3.0 API filter: dpo_seismometerChannel=MN*

Velocity - All Components (High Rate/Low Rate Overlaid in Plots): High-rate and low-rate velocity data will be plotted and overlaid on one graph for each orientation. For broadband seismometers, this will be H-band for high-rate and M- or L-band for low-rate depending on the requested time range. For short period seismometers, this will be E-band for high-rate and M- or L-band for low-rate.

Oceans 3.0 API filter: dpo_seismometerChannel=*H*

Acceleration - All Components (High Rate/Low Rate Overlaid in Plots): High-rate and low-rate acceleration data will be plotted and overlaid on one graph for each orientation. For broadband accelerometers, this will be C- and/or H-band. For long period accelerometers, this will be M-band.

Oceans 3.0 API filter: dpo_seismometerChannel=*N*

All Channels (High-Rate/Low-Rate Channels Overlaid In Plots): The All Channels Option will plot all available channels for the seismometer including velocity and accelerometer data, as well as pressure data. The high-rate and low-rate velocities and accelerations will be overlaid with matching orientations. If the selected output format is MAT file or miniSEED, then mass position will also be included.

Oceans 3.0 API filter: dpo_seismometerChannel=All


For Oceans 3.0 API (dataProductDelivery) Users

The Oceans 3.0 API filter parameter values listed above for  dpo_seismometerChannel do not correspond to IRIS channel codes, even though some are exactly the same. This may cause confusion for our API users in particular. For instance, IRIS channel codes HHZ and MHZ are also the same text as two of the available values for the dpo_seismometerChannel data product option, a parameter that's supplied in API calls to dataProductDelivery. The dpo_seismometerChannel Oceans 3.0 option/filter values are our shorthand and are not the IRIS channel codes. Only the listed Oceans 3.0 API filter values for dpo_seismometerChannel will work. The Oceans 3.0 option/filters correspond to multiple IRIS channel codes which are returned in the data product request (we overlay multiple channels in plots and bundle them together in file products). For clarity, the data product options listed above are summarized in the table below, showing the IRIS channel codes that will be returned for each Oceans 3.0 API filter value. We've grouped the IRIS channel codes by typical instrument type, and added vertical gaps to group by high/low-rate channels:

Seismometer Channel Option DescriptionOceans 3.0 API Filter ParameterIRIS Broadband Seismometer Channel CodesIRIS Short-Period Seismometer Channel CodesOther IRIS Channel Codes (Accelerometer, Mass Position Seismometer)

Vertical Velocity

(High-Rate/Low-Rate Overlaid in Plots)

*Z

HHZ, HH3

HLZ, HL3

CHZ, CH3

CLZ, CL3


LHZ, LH3

LLZ, LL3

MHZ, MH3

MLZ, ML3

EHZ, EH3

ELZ, EL3




LHZ, LH3

LLZ, LL3

MHZ, MH3

MLZ, ML3

HMZ, HM3

CMZ, CM3

EMZ, EM3



LMZ, LM3

MMZ, MM3

High-Rate Vertical Velocity

HHZ

HHZ, HH3

HLZ, HL3

CHZ, CH3

CLZ, CL3

EHZ, EH3

ELZ, EL3

HMZ, HM3

CMZ, CM3

EMZ, EM3

Low-Rate Vertical Velocity

MHZ

LHZ, LH3

LLZ, LL3

MHZ, MH3

MLZ, ML3

LHZ, LH3

LLZ, LL3

MHZ, MH3

MLZ, ML3

LMZ, LM3

MMZ, MM3

High-Rate Velocity - All Components

HH*

HHN, HHE, HHZ, HH1, HH2, HH3

HLN, HLE, HLZ, HL1, HL2, HL3

CHN, CHE, CHZ, CH1, CH2, CH3

CLN, CLE, CLZ, CL1, CL2, CL3

EHN, EHE, EHZ, EH1, EH2, EH3

ELN, ELE, ELZ, EL1, EL2, EL3

HMN, HME, HMZ, HM1, HM2, HM3

CMN, CME, CMZ, CM1, CM2, CM3

EMN, EME, EMZ, EM1, EM2, EM3

Low-Rate Velocity - All Components

MH*

MHN, MHE, MHZ, MH1, MH2, MH3

MLN, MLE, MLZ, ML1, ML2, ML3

LHN, LHE, LHZ, LH1, LH2, LH3

LLN, LNE, LNZ,  LN1, LN2, LN3

MHN, MHE, MHZ, MH1, MH2, MH3

MLN, MLE, MLZ, ML1, ML2, ML3

LHN, LHE, LHZ, LH1, LH2, LH3

LLN, LNE, LNZ,  LN1, LN2, LN3

MMN, MME, MNZ, MN1, MN2, MN3

LMN, LME, LMZ, LM1, LM2, LM3

Horizontal Acceleration

(High-Rate/Low-Rate Overlaid In Plots)

*N12

n/a

n/a

CN1, CN2, CNN, CNE

HN1, HN2, HNN, HNE


MN1, MN2, MNN, MNE

High-Rate Horizontal Acceleration

CN12

n/a

n/a

CN1, CN2, CNN, CNE

HN1, HN2, HNN, HNE

Low-Rate Horizontal Acceleration

MN12n/an/aMN1, MN2, MNN, MNE

High-Rate Acceleration - All Components

CN*

n/a

n/a

CN1, CN2, CN3, CNN, CNE, CNZ

HN1, HN2, HN3, HNN, HNE, HNZ

Low-Rate Acceleration - All Components

MN*n/an/aMN1, MN2, MN3, MNN, MNE, MNZ

Velocity - All Components

(High-Rate/Low-Rate Overlaid in Plots)

*H*

HHN, HHE, HHZ, HH1, HH2, HH3

HLN, HLE, HLZ, HL1, HL2, HL3

CHN, CHE, CHZ, CH1, CH2, CH3

CLN, CLE, CLZ, CL1, CL2, CL3


MHN, MHE, MHZ, MH1, MH2, MH3

MLN, MLE, MLZ, ML1, ML2, ML3

LHN, LHE, LHZ, LH1, LH2, LH3

LLN, LNE, LNZ,  LN1, LN2, LN3

EHN, EHE, EHZ, EH1, EH2, EH3

ELN, ELE, ELZ, EL1, EL2, EL3






MHN, MHE, MHZ, MH1, MH2, MH3

MLN, MLE, MLZ, ML1, ML2, ML3

LHN, LHE, LHZ, LH1, LH2, LH3

LLN, LNE, LNZ,  LN1, LN2, LN3

HMN, HME, HMZ, HM1, HM2, HM3

CMN, CME, CMZ, CM1, CM2, CM3

EMN, EME, EMZ, EM1, EM2, EM3






MMN, MME, MNZ, MN1, MN2, MN3

LMN, LME, LMZ, LM1, LM2, LM3

Acceleration - All Components

(High-Rate/Low-Rate Overlaid In Plots)

*N*

n/a

n/a

CN1, CN2, CN3, CNN, CNE, CNZ

HN1, HN2, HN3, HNN, HNE, HNZ


MN1, MN2, MN3, MNN, MNE, MNZ

All Channels

(High-Rate/Low-Rate Overlaid In Plots)

All

All channels returned from a location.

Where N/E are the North/East cardinal directions, Z is vertical, and 1/2/3 are non-cardinal orientations. It is possible for the 'All Channels' option (bottom of table) to return channels not included in the other options, such as the low-rate pressure data in the down-hole orientation (MDD,LDD). However, if there is channel data included here that should be part of one or more of the options/filters outlined above or should have a new option/filter, please contact us.


Note: A change in sample rate occurred in 2013 for all seismometers causing the low-rate channels to change from LHZ, LHE, LHN, LNZ, LNE and LNN to MHZ, MHE, MHN, MNZ, MNE and MNN. 

File-name mode field

The IRIS channel code is applied in the file mode field at the end of the file name after the date, separated with a '-'. If there is more than one, then they are listed (only occurs for overlaid plots), example: '-EHZ-MHZ'.

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