Seismometer Channel Option

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, Z is vertical, and 1/2/3 are intercardinal orientations.

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 high-rate E-band and low-rate M- or L-band.

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 the Oceans 3.0 API 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 Description	Oceans 3.0 API Filter Parameter	IRIS Broadband Channel Codes	IRIS Short-Period Channel Codes	IRIS Accelerometer Channel Codes
Vertical Velocity (High-Rate/Low-Rate Overlaid in Plots)	`*Z`	`HHZ, HLZ, HMZ` `EHZ, ELZ, EMZ` `CHZ, CLZ, CMZ` `LHZ, LLZ, LMZ` `MHZ, MLZ, MMZ`	`EHZ, ELZ, EMZ` `LHZ, LLZ, LMZ` `MHZ, MLZ, MMZ`	n/a
High-Rate Vertical Velocity	`HHZ`	`HHZ, HLZ, HMZ` `CHZ, CLZ, CMZ`	`EHZ, ELZ, EMZ`	n/a
Low-Rate Vertical Velocity	`MHZ`	`LHZ, LLZ, LMZ` `MHZ, MLZ, MMZ`	`LHZ, LLZ, LMZ` `MHZ, MLZ, MMZ`	n/a
High-Rate Velocity - All Components	`HH*`	`HHN, HHE, HHZ` `HLN, HLE, HLZ` `HMN, HME, HMZ` `CHN, CHE, CHZ` `CLN, CLE, CLZ` `CMN, CME, CMZ`	`EHN, EHE, EHZ` `ELN, ELE, ELZ` `EMN, EME, EMZ`	n/a
Low-Rate Velocity - All Components	`MH*`	`MHN, MHE, MHZ` `MLN, MLE, MLZ` `MMN, MME, MMZ` `LHN, LHE, LHZ` `LLN, LLE, LLZ` `LMN, LME, LMZ`	`MHN, MHE, MHZ` `MLN, MLE, MLZ` `MMN, MME, MMZ` `LHN, LHE, LHZ` `LLN, LLE, LLZ` `LMN, LME, LMZ`	n/a
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	`MN12`	n/a	`n/a`	`MN1, 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/a	n/a	`MN1, MN2, MN3, MNN, MNE, MNZ`
Velocity - All Components (High-Rate/Low-Rate Overlaid in Plots)	`H`	`HHN, HHE, HHZ` `HLN, HLE, HLZ` `HMN, HME, HMZ` `MHN, MHE, MHZ` `MLN, MLE, MLZ` `MMN, MME, MMZ` `LHN, LHE, LHZ` `LLN, LLE, LLZ` `LMN, LME, LMZ`	`EHN, EHE, EHZ` `ELN, ELE, ELZ` `EMN, EME, EMZ` `MHN, MHE, MHZ` `MLN, MLE, MLZ` `MMN, MME, MMZ` `LHN, LHE, LHZ` `LLN, LLE, LLZ` `LMN, LME, LMZ`	n/a
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 intercardinal 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 option/filters outlined above or 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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Seismometer Channel Option

File-name mode field