Questions about Logic tree structure and the update OQ version

[ilaria....@gmail.com]

Dear all,

I'm trying to run OpenQUake using some data different than what the software provides and I have a question. Reading the manual of OpenQuake I haven't found a clear answer.

 

I would like to define uncertainty on G-R a and b values  of my source model. I'm following the explanation provided at pages 69-71 of the latest version of OQ manual for the filesource_model_logic_tree.xlm. My doubt concerns how to write the file source_model.xlm.

In source_model_logic_tree.xlm there are a certain number of pairs of a and b values associated with a weight for the source 4. Below the line I'm referring to:

        ...

        <logicTreeBranchingLevel branchingLevelID="bl2">
            <logicTreeBranchSet uncertaintyType="abGRAbsolute"
                                applyToSources="4"
                                branchSetID="bs21">
                <logicTreeBranch branchID="b21">
                    <uncertaintyModel>1.2464 0.499</uncertaintyModel>
                    <uncertaintyWeight>0.5</uncertaintyWeight>
                </logicTreeBranch>
                <logicTreeBranch branchID="b22">
                    <uncertaintyModel>0.2464 0.499</uncertaintyModel>
                    <uncertaintyWeight>0.5</uncertaintyWeight>
                </logicTreeBranch>
           </logicTreeBranchSet>
        </logicTreeBranchingLevel>

       ....

In source_model.xlm should I provide a and b for the same source or should I leave those field blank? In the first case I guess the pair of a and b values are alternative to those in source_model_logic_tree.xlm.

         ....

          <truncGutenbergRichterMFD aValue="??" bValue="??" minMag="6.5" maxMag="7.5" />

         ....

I am not sure I explained my problem well.

 

The following question is due to the fact I'm not very familiar with ubuntu. I run OpenQuake on a virtual machine VMware Player.

Since I have installed it, I have never updated OQ software. Do you advice me to update it? if so, what is the commands to do it?

 

Thank you very much for your patience and sorry if my questions might be trivial.

 

Kind regards,

Ilaria

 

[Luigi Panzeri]

Hi Ilaria,

When your source model logic tree file specifies alternatives a and b values (like in your example), the values specified in the source models will be ignored.

More precisely, the latter values will be overridden with the values eventually specified in your logic tree file. Therefore, each alternate couple of a-b value is assigned to a concrete instance of the fault source model actually considered (aka realization) in the calculation.

Unfortunately, you can not leave such fields blank for technical reasons (this is certainly a problem we will address soon). Just set them to any strictly positive value and do not care about them.

Kind regards,

Luigi Panzeri

2013/9/5 <ilaria....@gmail.com>

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[ilaria....@gmail.com]

Thank you very much for the explanation. I solved my doubt.

Kind regards,

Ilaria