نرم افزار حرفه ای تحلیل خطر زلزله SeisRisk III
Seisrisk
III is the last published version of a series of programs used to
produce probabilistic earthquake ground motion hazard maps for the
United States from 1972 to 1992.
Though it has been superseded in the US Geological Survey by a more
flexible program allowing for sources based on smoothing of historical
seismicity, Seisrisk III is still being used as a teaching tool in
academia and for hazard mapping in other countries. In the past decade,
Seisrisk III has been used for hazard mapping in Italy, Turkey, Iran, in
the Mediterranean countries as a whole, and in the West Indies, for
example.
Because
of this continuing interest, we are continuing to host the source code
and references to publications on the structure and the use of Seisrisk
III, including auxiliary programs for the construction of input.
However, except for answering a few helpful questions, we are no longer
providing support or advice for users. We are also hosting a set of
program modifications to Seisrisk III written by a colleague in the
Bureau of Reclamation. We are aware that other modifications exist, for
instance, one version adapted to use intensity and its uncertainties
instead of parametric ground motions, and another adapted to use
non-circular isoseismals for point sources. These can be found by
diligent search of the internet.
Known Issues
We are aware of some known issues with the software however we have no plans to fix any of the following or other issues:
* A
“bug fix” exists that has not yet been incorporated in any published
version of SEISRISK III. This fix is to ensure a proper interpolation
for values which involve the “last box” in the ground-motion annual-rate
accumulators. This bug does not usually cause a problem, because most
users scale the ground motions such that the interpolation primarily is
taking place in the lower range of accumulator boxes.
* A
“loose end” exists in subroutine inside. The subroutine has a trap
which does not permit a calculation when a site point lies too close to a
quadrilateral corner point. When such a point is discovered in the
course of a run, the run is terminated. If this happens, it is easy to
adjust the “equator” by a very slight amount, thus moving the site point
away from the corner point. Because rather a good deal of calculation
can go past before such a site is discovered by the program, it would be
desirable to permit the program to continue rather than terminate. We
have not worked on a version to do this, because we encounter the
problem rather infrequently in our usage. However, users with complex
sources or small site-grid spacing may find the simple adjustment merely
induces a failure at a different site
http://earthquake.usgs.gov/hazards/apps/seisrisk/seisrisk.zip
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