GMP Examples

Examples with fake data can be found in this repository here. These examples are selected to illustrate a number of different possible instrument configurations and to highlight the value of sensible grouping of traces into streams.

Example 1

This is a very simple example for station CI.CCC. It contains a single stream for the HN instrument with. It contains two traces: the HNE component, and ROTD50.

This illustrates one important aspect of this data structure: ROTD50 is derived from two horizontal components for this instrument and the ROTD50 metrics cannot be derived from the metrics of the individual components. Thus, it is valuable to report it at the “trace” level (note that there is a trace from which ROTD50 is derived, which is a rotated combination of the horizontal traces).

For the HNE trace, the metrics dictionary includes response spectra (a 2D array metric) and peak ground acceleration (a scalar metric).

For the ROTD50 trace, the metrics dictionary includes significant duration (a 2D array metric) and bracketed duration (a 1D array metric).

Multichannel

This example is also for a single station (BK.OVRO) and contains a single stream for the HN instrument. It contains three traces: HNN, HNE, and HNZ. Each traces includes PGA and response spectra metrics.

Borehole Example

This is for the downhole geotechnical array at Treasure Island. There are three traces at each depth, and each depth is grouped as a stream.

Multisamplerate

This is example is for a single free field station (CI.CCC). This station has a 3 component strong motion sensor that is being recorded at 100 sps and 200 sps. Each sample rate is grouped as a stream and as 3 traces for each sensor component as well as ROTD50 trace in the 100 sps stream.