Issues getting synthetics from FK database

[ammcpherson]

Good afternoon,

I am trying to save synthetics from MTUQ to visualize against real data. I have done this with SPECFEM-generated Green's functions, but when I attempt to do the same thing using an FK database, no synthetics are generated. I cannot share the FK database of course, but these are the basic commands of what I am doing:

fk_path = '/store/wf/FK_synthetics/'+model
db = open_db(fk_path,format='FK')

origin = Origin({
        'time': '2022-09-24T15:18:54.694000Z',
        'latitude': 61.4915,
        'longitude': -145.5887,
        'depth_in_m': 41000.0,
        'id': str(eid)
})

data = read(path_data, format='sac', 
            event_id=event_id,
            station_id_list=station_id_list,
            tags=['units:m', 'type:velocity']) 

data.sort_by_azimuth()
stations = data.get_stations()

greens = db.get_greens_tensors(stations, origin)

synthetics = greens.get_synthetics(MomentTensor([269000000000000,-15643000000000000,15374000000000000,5999000000000000,7576000000000000,4205000000000000]),components=['Z','R','T'])

os.makedirs(eid+'_synthetics',exist_ok=True)
synthetics.write(eid+'_synthetics/%s/' % model,format='sac') 

As I said, this works when I am using SPECFEM-generated GFs, and the only thing that changes is how I open the GF database:

SF_path = './GFs/%s/%s' % (eid,model)
db = open_db(SF_path,format='SPECFEM3D')

Is there something that needs to change about my approach to get synthetics from an FK database?

Thanks, Amanda

[rmodrak]

Hi Amanda, Thanks for the report. Maybe add some print() or type() statements to try to get to the bottom of it? I will take a look as well.

On Wed, Oct 23, 2024 at 5:26 PM Amanda McPherson @.***> wrote:

Good afternoon,

I am trying to save synthetics from MTUQ to visualize against real data. I have done this with SPECFEM-generated Green's functions, but when I attempt to do the same thing using an FK database, no synthetics are generated. I cannot share the FK database of course, but these are the basic commands of what I am doing:

fk_path = '/store/wf/FK_synthetics/'+model db = open_db(fk_path,format='FK')

origin = Origin({ 'time': '2022-09-24T15:18:54.694000Z', 'latitude': 61.4915, 'longitude': -145.5887, 'depth_in_m': 41000.0, 'id': str(eid) })

data = read(path_data, format='sac', event_id=event_id, station_id_list=station_id_list, tags=['units:m', 'type:velocity'])

data.sort_by_azimuth() stations = data.get_stations()

greens = db.get_greens_tensors(stations, origin)

synthetics = greens.get_synthetics(MomentTensor([269000000000000,-15643000000000000,15374000000000000,5999000000000000,7576000000000000,4205000000000000]),components=['Z','R','T'])

os.makedirs(eid+'_synthetics',exist_ok=True) synthetics.write(eid+'_synthetics/%s/' % model,format='sac')

As I said, this works when I am using SPECFEM-generated GFs, and the only thing that changes is how I open the GF database:

SF_path = './GFs/%s/%s' % (eid,model) db = open_db(SF_path,format='SPECFEM3D')

Is there something that needs to change about my approach to get synthetics from an FK database?

Thanks, Amanda

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[rmodrak]

It looks like the network, station, and location codes are not getting copied to the synthetics. The result is the following output file names. ...R.sac ...T.sac ...Z.sac

[rmodrak]

One way to get the correct filenames is to manually pass a list of ObsPy stats objects via the stats keyword argument when calling get_synthetics().

The syntax would be something like

synthetics = greens.get_synthetics(mt, stats=stations, components=components, mode='map')

This gets complicated though, I would have to look closely in order to recall the exact correct syntax.

Of course, we want these station codes to get passed seamlessly... trying to figure out a larger fix