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Filtering Records

Magnitude

•Mw: Moment Magnitude

•ML: Local Magnitude (Richter Magnitude)

•MS: Surface Wave Magnitude

•M_Other: Other types of Magnitudes

•Any: Choose any of the available Magnitudes

Distance

•dEpi: The epicentral distance is defined as the shortest distance from a seismic station or any other site to the epicentre of the seismic event.

•dHypo: The hypocentral distance is defined as the shortest distance from a seismic station or any other site to the hypocentre of the seismic event.

•dRup: The shortest distance from a site or seismic station to the rupture surface

•dSurf: Joyner-Boore Distance (Rjb) - shortest horizontal distance from the recording site to the vertical projection of the rupture.

•dSeism: Campbell R Distance, shortest distance from the recording site to the seismogenic portion of the ruptures area (Campbell, 1977). This distance measure assumes that the rupture with the near-surface sediment or the mayow portion of fault gouge is non-seismogenic. The depth below which rupture is seismogenic was estimated using new guidelines from Campbell. The shortest distance from a site to a point on a rupture surface that is deeper than some minimum seismogenic depth. 

•dRMS: Root Mean Squared Distance

NEHRP Soil Type

•A: Hard Rock, Vs30 > 1500 m/s

•B: Rock, 760 m/s < Vs30 ≤ 1500 m/s

•C: Very dense soil and soft rock, 360 m/s < Vs30 ≤ 760 m/s 

•D: Stiff Soil, 180 m/s ≤ Vs30 ≤ 360 m/s

•E: A soil profile with Vs30 < 180 m/s

•F: Soils requiring site-specific evaluations

•(A,B): A or B

•(B,C): B or C

•(C,D): C or D

•(D,E): D or E

•(E,F):  E or F

•User-defined: User can type other combinations. Example: A,B,C (i.e. A or B or C)

•Undefined

Vs30

Shear wave velocity (m/s) at a depth of 30 m. User can specify a range of velocities in which the generated ground motions were recorded at the defined ranged.

Duration or Freq

Duration or Freq: Users can adjust two additional filters by setting the range of interest for the duration or the frequency of the record.

The available Duration and Frequency options are as follows:

•D5-95: earthquake duration is determined based on the total time elapsed from 5%  to 95% of the integral of the acceleration  

•D5-75: earthquake duration is determined based on the total time elapsed from 5%  to 75% of the integral of the acceleration

•Duration: Period of the record

•FreqHP: High Pass Frequency

•FreqLP: Low Pass Frequency

•FreqLU: Lowest Usable Frequency

A frequent practice is to define the D5-95 and FreqLU to filter desired records.

Note that D5-95 or D5-75 may not be calculated for records in the database. The user may need to pre-compute these IM's for the desired records (using the Compute Sa & IM's tool) before filtering by this IM. This only needs to be done once, since those IM's will then be cached in the database.

Can be rotated to FN/FP

If checked, only records that can be rotated to FN/FP will be included. A record can be rotated to FN/FP if the following are available in the metadta: 1) Fault-Parallel Azimuth (FpAz), 2) Azimuth of H1 component (AzimuthInst), 3) Azimuth of H2 component (AzimuthInst).