Download Implementation of accelerometric parameters computation

NA5 + D4: ACCELEROMETRIC PARAMETERS COMPUTATION AND EXCHANGE
Summary
The proposal of the Task B inside the NA5 was: the definition and implementation of
parametric data exchange procedures. The participants on this task are: IGC, LGIT,
ITSAK, ETHZ, KOERI, EMSC, IST and ETHZ
Concretely, the main objectives are:
•
Definition of the parametric data to be exchanged and the procedures to
compute them.
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Implementation of software at networks.
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To promote the exchange of Pseudo Spectral Acceleration (PSA) and Pseudo
Spectral Velocity (PSV), extremely useful to constrain shakemaps (Æ JRA3),
make comparisons with community intensity maps (Æ NA7) and validate
attenuation laws.
•
To initiate the collection and distribution of parametric data through the portal
(ÆNA7, TA1).
This task must generate the following objects:
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The software to obtain from every record the parametric data.
At this point it is important to remark that the aim of this project is not to provide
a software tool to compute accelerometric parameters in a customizable way. It
must be taken into account that the main idea is to disseminate a common,
homogenous and automatic way to compute that parameters. Therefore, the
processing procedures to compute parameters will be always the same with any
event, whatever its magnitude, source, etc.
Neither is it a goal of the project to disseminate time-histories of the events
(filtered acceleration, velocity and displacement) although they are calculated.
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The parametric files and the event information files which will content the
metadata needed to perform the searches of records and, in a future, to
constrain shakemaps, validate attenuation laws, etc.
In order to choose the adequate procedures to be implemented in the parameters
computation software, a miniBenchmark exercise was proposed. Then, a common
procedure for parameters computation was studied and implemented. The parameters
computation software was distributed to all participants and their comments were taken
into account to generate new versions.
After the NERIES meeting of March 2008 in Grenoble some improvements has been
introduced. Recommendations expressed by external reviewers have been considered
(October 2008, update).
After a comparison of parameters from ITACA (INGV) computed with ParamaccV8 an
error was detected in Housner Intensity routine and corrected in a new version
ParamaccV9 (February 2010, updated).
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