Database Read Me | CRSMD

Catalog fields

`filename`	Filename Unique record/file identifier used to relate the catalog with intensity measures and spectra.
`date`	Event date Date associated with the earthquake record.
`earthquakeLat / earthquakeLot`	Event coordinates Latitude and longitude of the earthquake epicentre.
`depth`	Depth Earthquake focal depth, expressed in kilometres.
`magnitude`	Magnitude Mw Moment magnitude used by the CRSMD catalog.
`source`	Source type Code describing the tectonic/source classification assigned to the earthquake.
`stationCode`	Station code Identifier of the strong-motion station that recorded the event.
`instrument / serial`	Instrument Instrument type and serial number.
`stationLat / stationLot`	Station coordinates Latitude and longitude of the recording station.
`stationElevation`	Station elevation Station elevation above sea level, expressed in metres.
`siteCondition`	Installation condition Historical LIS code describing whether the instrument is in free field or in a building.
`deltaT`	Sampling interval Time interval between consecutive samples.
`minFiltFreq / maxFiltFreq`	Filter frequencies Minimum and maximum frequencies used in signal filtering.
`numberOfPoints`	Number of points Number of samples contained in the record.

Source codes

The 2006 LIS format documented LOCAL and SUBDUC. The current CRSMD catalog uses shortened/updated codes such as SUBDU and also distinguishes INSLAB. Modern LIS research separates crustal, subduction interface and subduction intraslab tectonic regimes.

`LOCAL`	Local / crustal Local or shallow crustal earthquake classification.
`SUBDU`	Subduction Subduction-source code used in the current CRSMD catalog. It is kept as the database code; modern analyses further distinguish interface and intraslab events.
`INSLAB`	Subduction intraslab Earthquake occurring within the subducting plate; also described as deep or intraplate subduction.
`UNDEF`	Undefined No tectonic-source classification is defined in the record.
`SUBDUC`	Historical subduction code Subduction code documented in the original 2006 LIS data-format publication.

Installation-condition codes

These codes describe the instrument location/refuge, not the geological soil class.

`FFD`	Free field Instrument installed in a free-field condition.
`BDU`	Building up Instrument located in the upper part of a building.
`BDG`	Building down Instrument located in the lower part of a building.

Historical soil codes

The legacy LIS format documented the following soil classes. Current station pages may use more detailed or revised site information.

`S1`	Rock Rock site.
`S2`	Hard Hard soil/site class.
`S3`	Soft Soft soil/site class.
`S4`	Very soft Very soft soil/site class.

Distance measures

`Epicentral distance` km	Repi Horizontal distance between the earthquake epicentre and the recording station.
`Hypocentral distance` km	Rhyp Three-dimensional distance between the earthquake hypocentre and the recording station.
`Joyner-Boore distance` km	Rjb Shortest horizontal distance from the station to the surface projection of the rupture.
`Rupture distance` km	Rrup Shortest three-dimensional distance from the station to the rupture surface.

Record components

`N00E`	North-South / longitudinal component Horizontal component identified in the LIS format as N00E.
`N90E`	East-West / transverse component Horizontal component identified in the LIS format as N90E.
`Z / UPDO`	Vertical component Vertical motion component. Historical LIS files used UPDO; current tables use Z.

Intensity measures (IM)

CRSMD stores IM values by component when applicable. PGA is expressed in cm/s² and PGV in cm/s in the current interface.

`PGA`	Peak Ground Acceleration Maximum absolute ground acceleration in the processed record.
`PGV`	Peak Ground Velocity Maximum absolute ground velocity.
`PGV/PGA`	PGV-to-PGA ratio Ratio between peak ground velocity and peak ground acceleration.
`ACCrms`	RMS acceleration Root-mean-square acceleration over the analyzed motion.
`VELrms`	RMS velocity Root-mean-square velocity over the analyzed motion.
`Arias`	Arias intensity Energy-related intensity measure obtained from the time integral of squared acceleration.
`SigDur`	Significant duration Duration measure based on the accumulation of seismic-motion energy.
`IC`	Characteristic intensity Intensity measure stored by CRSMD for each component.
`SED`	Specific energy density Energy-related measure derived from the velocity time history.
`CAV`	Cumulative Absolute Velocity Time integral of the absolute acceleration, used as a cumulative ground-motion measure.
`ID-PGV`	PGV-related intensity/duration measure PGV-related measure stored in the CRSMD intensity-measure table.
`pgaLarger2 / pgaLarger3`	Larger PGA combinations Derived larger-component PGA combinations stored by CRSMD.

Response spectra

Spectral tables store acceleration ordinates by oscillator period.

`SAN00E / SAN90E`	Component spectra Spectral acceleration for the two horizontal components.
`SAGM`	Geometric-mean spectrum Spectrum derived from the geometric mean of the horizontal components.
`SALarger`	Larger-component spectrum Spectrum derived from the larger horizontal response.
`RotD00 / RotD50 / RotD100`	RotD spectra Orientation-independent rotated horizontal spectra represented by the 0th, 50th and 100th percentiles.
`GMRotD / GMRotI`	Rotated geometric-mean families Additional rotated spectral families stored by CRSMD.

Documentation basis

A. Moya Fernández (2006), “Nuevo formato de datos para el Laboratorio de Ingeniería Sísmica del Instituto de Investigaciones en Ingeniería de la Universidad de Costa Rica”, Ingeniería 16(2), 63–74.
Schmidt-Díaz & Esquivel-Salas (2022), “Análisis de datos acelerográficos de Costa Rica para la generación de modelos de atenuación: periodo 1998 a 2021”, Revista Geológica de América Central.
CRSMD database schema: catalogo, IMs_time_histories and response-spectra tables.