What's new
What is new in CRISIS (since CRISIS 2013 up to CRISIS 2015 v1.1)
About data files:
Reading source parameters from shape files
Map file is back
A new xml file that stores the same information than the *.dat file, but in a more convenient format. This file will progressively substitute the old *.dat File
About geometry of the sources:
Grid source (new geometry model)
Area Planes (new geometry model)
New options in Area geometries
A small correction in computation of areas in Area and Area Planes
About seismicity models:
Generalized Poissonian (new seismicity model)
Gridded seismicity (new seismicity model)
About ground motion prediction models:
New collection of GMPM
GMPM viewer
Some corrections were made to GMPM Atkinson and Boore, 2006
About sites of computation:
DEM File
About site effects:
Sigma grids in site-effects
About variables to compute seismic hazard:
CAV filters
About tools:
Event set generator
New tools
About computations:
Computations in CRISIS are now partially parallelized, so a substantial reduction in computing time might be expected in computers that have more than one processor. In limited tests carried out in one of the authors' machine, with 8 processors, computation times were reduced by a factor of 3.
About results:
Various forms of writing results
Disaggregation file (*.des) is back
What is new (from CRISIS2015 v1.2 on)
About data files:
Some back compatibility errors while reading source parameters from shape files have been corrected
About geometry of the sources:
There is a new geometry model, called "Rectangular Faults", that operates pretty much the same as area sources with the option "Treat as fault" activated. In other words, hypocenters are uniformly distributed across a rectangular area and rupture areas are not allowed to go out of the rectangular area. The main difference, however, is that this new geometry model produces rectangular rupture areas and not elliptical, as in the case of area sources.
Previously, for seismicity models Gutenberg-Richter, Characteristic Earthquake and Gridded Seismicity, the number of magnitudes that were used for the hazard integral was fixed to 9. Starting from CRISIS 2015 version 2.0, this number is variable, given by the user.
About ground motion prediction models:
Some corrections were made to Campbell and Bozorgnia's 2014 GMPE.
About run:
As suggested by Dr. Thomas Chartier, a batch computation utility has been created, which allows running CRISIS from a command line at the OS prompt.
Upon a suggestion of Dr. Thomas Chartier and Dr. Marco Santulin, CRISIS has now the ability to compute *.map files that result from a logic-tree computation. Also, the computation of a logic tree gives, as a new result, the values of the percentiles of the hazard measure chosen (probability of exceedance, non-exceedance probability or equivalent exceedance rate) for the intensity values selected by the user. See here some more details.
A more precise algorithm was introduced to compute distances RRUP and RJB for elliptical ruptures with very large or very small aspect ratios. This change does not affect circular ruptures, for which RRUP and RJB was already computed exactly.
Previously, elliptical ruptures were constructed with the aspect ratio indicated by the user until the rupture did not fit in the area source with that aspect ratio. After that, aspect ratio was changed to that of the area source, in order to accommodate the largest possible rupture area. This has been changed for a smoother aspect ratio assignment. Now, when the elliptical rupture does not fit with the given aspect ratio, CRISIS has a smooth transition between the aspect ratio given by the user and the area source aspect ratio. This slightly affects computation of RRUP and RJB for relatively large earthquakes.
About validation of the seismic hazard results:
PEER benchmarks tests (Set 1 and Set 2) have been recomputed with the newer versions, with excellent results, which are presented here.