# Description of GMP —A GeoJSON Specification for Ground Motion Metrics
Here we present a specification for a GeoJSON (https://geojson.org/) format for
unassociated and event-associated ground motion metrics—that is, quantities
derived from ground motion records (e.g., accelerograms, velocity recordings).
We refer to this specification as a Ground Motion Packet (GMP). Common example
metrics include peak ground acceleration (PGA), peak ground velocity (PGV), and
spectral acceleration (SA). This format is designed so that it can also include
metrics that are gaining popularity for many engineering use cases, such as
significant duration, Arias intensity, and inelastic response spectra. This
format should be able to be used by any application that uses ground motion
metrics including, but not limited to, ShakeMap. The GMP format is not meant to
describe station metadata or site installation. The purpose of the metadata
included in the GMP format is to provide high-level information regarding the
suitability of the data for common engineering/seismological applications.
## Documentation
[User Documentation](https://ghsc.code-pages.usgs.gov/esi/ground-motion-packet/)
## Demo
[Sample Jupyter notebook](https://code.usgs.gov/ghsc/esi/ground-motion-packet/-/blob/main/notebooks/pydantic_demo.ipynb)
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"author_email": "Mike Hearne <mhearne@usgs.gov>, Eric Thompson <ethompson@usgs.gov>, Ellen Yu <eyu@caltech.edu>, Lijam Hagos <lijam.hagos@conservation.ca.gov>, Jamie Steidl <steidl@ucsb.edu>, Bruce Worden <cbworden@contractor.usgs.gov>",
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"description": "# Description of GMP \u2014A GeoJSON Specification for Ground Motion Metrics\n\nHere we present a specification for a GeoJSON (https://geojson.org/) format for \nunassociated and event-associated ground motion metrics\u2014that is, quantities \nderived from ground motion records (e.g., accelerograms, velocity recordings). \nWe refer to this specification as a Ground Motion Packet (GMP). Common example \nmetrics include peak ground acceleration (PGA), peak ground velocity (PGV), and \nspectral acceleration (SA). This format is designed so that it can also include \nmetrics that are gaining popularity for many engineering use cases, such as \nsignificant duration, Arias intensity, and inelastic response spectra. This \nformat should be able to be used by any application that uses ground motion \nmetrics including, but not limited to, ShakeMap. The GMP format is not meant to \ndescribe station metadata or site installation. The purpose of the metadata \nincluded in the GMP format is to provide high-level information regarding the \nsuitability of the data for common engineering/seismological applications.\n\n## Documentation\n[User Documentation](https://ghsc.code-pages.usgs.gov/esi/ground-motion-packet/)\n\n## Demo\n[Sample Jupyter notebook](https://code.usgs.gov/ghsc/esi/ground-motion-packet/-/blob/main/notebooks/pydantic_demo.ipynb)\n",
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