# Ground-motion records and basin depth models for the Portland, Oregon, 2005-2022

## Files

`Portland_RotD50_Vs30Zx.csv`
    Comma-separated-value flatfile of ground-records with RotD50
    horizontal psuedoacceleration response specta (5% damped) at 21
    periods (0.01-10 s). RotD50 is the median value across all
    horizontal orientations.
	
`Portland_Waveforms.cfg`
    Parameter file with FDSN (International Federation of Digital
    Seismograph Networks) search parameters and stations and
    earthquakes remove from analysis.

`Portland_Zx.tiff`
    GeoTiff raster file with Z1.0 (Band 1) and Z2.5 (Band 2) in meters
    from the USGS National Crustal Model
    (https://doi.org/10.5066/P9T96Q67). Z1.0 generally coincides with
    the top of the Columbia River Basalt Group. Z2.5 in this region of
    the model is highly variable; we assume that Z2.5 coincides with
    the top of the early Eocene basement rock.

`colocated.yml`
    gmprocess configuration file with custom settings for handling
    colocated sensors.

## Data processing

I processed the raw ground motions using gmprocess version 1.2.3
(https://dx.doi.org/10.5066/P9ANQXN3) with some additional bugfixes
(git hash b09e229cf50d4f667cfb50472eeec938b047648a). I customized the
handling of colocated sensors to give priority to broadband channels
using `colocated.yml`.  All of the the remaining gmprocess settings
use the default values.

## Columns in `Portland_RotD50_Vs30Zx.csv`

Column header,Description
EarthquakeId,Event ID from Comcat
EarthquakeTime,Earthquake origin time (UTC)
EarthquakeLatitude,Earthquake latitude (decimal degrees)
EarthquakeLongitude,Earthquake longitude (decimal degrees)
EarthquakeDepth,Earthquake depth (km)
EarthquakeMagnitude,Earthquake magnitude
EarthquakeMagnitudeType,Earthquake magnitude type
Network,Network code
DataProvider,Data source provider
StationCode,Station code
StationID,"Concatenated network, station, and instrument codes"
StationDescription,Station description
StationLatitude,Station latitude (decimal degrees)
StationLongitude,Station longitude (decimal degrees)
StationElevation,Station elevation (m)
SamplingRate,Record sampling rate (Hz)
BackAzimuth,Site-to-source azimuth (decimal degrees)
EpicentralDistance,Epicentral distance (km)
HypocentralDistance,Hypocentral distance (km)
SourceFile,Source file
RuptureDistance,Closest distance to the rupture plane (km)
RuptureDistanceVar,Variance of rupture distance estimate (km^2)
JoynerBooreDistance,Joyner-Boore distance (km)
JoynerBooreDistanceVar,Variance of Joyner-Boore distance estimate (km^2)
GC2_rx,Distance measured perpendicular to the fault strike from the surface projection of the up-dip edge of the fault plane (km)
GC2_ry,Distance measured parallel to the fault strike from the midpoint of the surface projection of the fault plane (km)
GC2_ry0,Horizontal distance off the end of the rupture measured parallel to strike (km)
GC2_U,"Strike-normal (U) coordinate, defined by Spudich and Chiou (2015; https://doi.org/10.3133/ofr20151028) (km)"
GC2_T,"Strike-parallel (T) coordinate, defined by Spudich and Chiou (2015; https://doi.org/10.3133/ofr20151028) (km)"
H1Lowpass,H1 channel lowpass frequency (Hz)
H1Highpass,H1 channel highpass frequency (Hz)
H2Lowpass,H2 channel lowpass frequency (Hz)
H2Highpass,H2 channel highpass frequency (Hz)
DURATIONp-q,p-q percent significant duration (s)
PGA,Peak ground acceleration (%g)
PGV,Peak ground velocity (cm/s)
SA(X),Pseudo-spectral acceleration (%g) at X seconds
SORTED_DURATION,Sorted significant duration (s)
Vs30, Time-averaged shear wave speed in the top 30 m (m/s)
Z1.0, Depth of the 1.0 km/s shear-wave isosurface (m)
Z2.5, Depth of the 2.5 km/s shear-wave isosurface (m)