EZ-Frisk v7.52 Build 003 (Install + Medicine)
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What's New in Version 7.52
This release adds an important new feature, calculation of the Conditional Mean Spectrum. It also includes various enhancements and minor bug fixes.
Conditional Mean Spectrum
The conditional mean spectrum is now calculated as a part of deaggregation. The results can be view in the deaggreation report and as a deaggregation plot. The details on how EZ-FRISK calculates the conditional mean spectrum are found in the technical reference.
The conditional mean spectrum can be used as target spectrum for spectral matching. The user interface now lets you select the target spectrum as either a PSHA uniform hazard spectrum, a PSHA conditional mean spectrum, or a user-defined target spectrum.
Deterministic Hazard Calculation for Subduction Interface Sources
Previously, the deterministic hazard calculation for this category of sources presumed that the entire surface ruptured during the deterministic event. Now, the code calculates the size of the rupture for the deterministic magnitude, and then places the rupture at a selection of locations on the surface of the source, based on the integration parameters. It then selects the event with the greatest ground motion.
This change should provide more realistic estimates for the focal depth, rupture width, and center-of-energy distance to use in the deterministic hazard calculation for these sources.
Bug Fixes
In seismic hazard analysis:
1. Enabling or disabling deaggregation did not cause the seismic hazard analysis definition document to be marked as modified. So if this was the only change, it did not get saved. If this happened, the analysis would not run with the deaggregation option the user desired. This problem has been resolved.
2. Not all calculational parameter entries were validated properly. If an invalid calculational parameter was specified, the program would allow the invalid document to be saved. However, calculational parameter were validated upon reading. Consequently, if the invalid document could not be reopened to fix the problem Now additional validation has been added for subdution interface, subduction slab, and gridded calculation parameters. In addition, these parameters are not validated upon reading. Instead they are validated upon writing and use.
3. The Atkinson-Boore ENA equations includes terms that are undefined when the closest distance to rupture was zero. This caused the attenuation equation to give undefined results for these cases, and very large ground motions close to zero distance. This problem was resolved by specifying a minimum distance of 1 km, instead of 0 km, for all variants of this attenuation equation, since no data closer than 1 km was used in developing these attenuation equations.
4. In the McVerry attenuation equations for New Zealand, previously the equation produced very large PGA ground motion predictions when used with deep slab sources. This occurred because for short periods the ground motion is predicted to increase with centroid depth . However, McVerry's equations are based on a data set with no events with a centroid depth greater than 149 km. Consequently, we have added a cap to the centroid depth used. The default value for this maximum centroid depth is 149 km.
5. In the McVerry attenuation equations based on Vs30, for some circumstances, the wrong ground motion predictor equations were used with some previous versions of EZ-FRISK. When this happened, the standard McVerry code was used, hence the user would be required to specify the New Zealand soil class directly, and the value of the Vs30 that the user specified would not be used to determine the New Zealand soil class. This problem has been resolved.
6. The McVerry attenuation equation variants for calculating the strongest horizontal component of ground motion, the intensity type previously was spectral acceleration at 5% damping. It has now been changed to the maximum rotated component of spectral acceleration at 5% damping. This should make it clearer which equation variants should be used for typical analyses.
In spectral matching:
7. The spectrum for external baseline corrected time history was not plotted correctly. This problem is now resolved.
8. Changing the target spectrum source in spectral matching did not cause the project document to be marked as modified. So if this was the only change, it did not get saved.
9. In calculating the target spectrum based on a PSHA uniform hazard spectrum, the amplitude unit of measure previously was assumed to be accelerations in G. Consequently, the target spectrum would not be correct if the PSHA was for pseudo-spectral velocity or displacement, or if the acceleration was in cm/sec/sec. Now, the target spectrum generation includes a units conversion step.
10. Previously, any seismic hazard analysis with output results in the same project could be selected as the source of a uniform hazard spectrum for use as the target spectrum for spectral matching. However, some seismic hazard analyses cannot produce a useful uniform hazard spectrum. For example, the seismic hazard analysis might have no PSHA calculations, or it might be based on a non-spectral intensity type such as peak ground velocity. Now, the program only allows selection from analyses that are spectral and have two amplitudes.
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