Network Magnitudes

[mmesim]

It would be useful to get network magnitudes for each detection. Then during the post-processing with scolv we can screen magnitudes easily.

[mmesim]

I'm writing this here in order not to forget about it.

I couldn't see any Magnitudes on scolv event list, perhaps because I was looking at unassociated origins.

I did the following ->

1) Edit the scolv module, tab VisibleMagnitudes, and add MLhc, MLh, MRelative, etc..

2) Import in the db a scml file that contains Events

3) I got this

So my guess is that if we assign Network Magnitudes, then perhaps we will see those on scolv. It might need a tiny configuration on scevent to make sure it understands MRelative.

The Magnitudes tab on scolv, where you can see Station Magnitudes, might be a bit more complicated.

Thoughts @luca-s @FMassin ?

[luca-s]

If you are talking only about unassociated origins your understanding is correct, you won't be able to see the magnitude. That is because each origin might have multiple magnitudes and scevent task (one of many) is to select the preferred magnitude among all the origins and among all the magnitudes. You see that selected/preferred magnitude in the event list tab.However if an origin is not associated, it means scevent was not run or it was not able to create an event for that origin (because it doesn't satisfy the parameters configured for scevent). Without an event, there is no magnitude visualized. However you should be able to view all origin available magnitudes in the Magnitudes tab

[damb]

However you should be able to view all origin available magnitudes in the Magnitudes tab.

@mmesim, can you confirm that the StationMagnitudes are displayed after adding e.g. MRelative to the list of visibleMagnitudes?

[mmesim]

I cannot see StationMagnitudes.

[mmesim]

I had a short conversation with @luca-s yesterday and it is more clear to me what happened.

In brief, and @luca-s please correct me if I'm wrong,

• Unassociated origins: they do not have magnitudes because scevent did not run, so we do not have preferred solution or preferred magnitude.
• Seiscomp Events (e.g. CH-quakes): an event has been created, scevent selected the prefered origin and associated multiple origins. Magnitudes are shown on the event list and also station magnitudes on the Magnitude tab.
• scdetect-cc events: There is no magnitude shown on the event list, because we do not calculate Network Magnitudes. Although there are station magnitudes, i.e. when you export the event from the database, these are not displayed on the magnitude tab. That's because there is no event magnitude and thus the station magnitudes are not displayed.

To conclude, it is crucial to get network magnitudes.

[luca-s]

@damb basically in the scdetect-cc origin we found the stationMagnitude object but the magnitude one is missing. Please have a look how a magnitude looks like:

[damb]

@mmesim, which approach do you suggest to compute the NetworkMagnitude? Do you require it to be configurable?

@luca-s thanks.

[mmesim]

I think the median of the station magnitudes will do the trick.

No