Comments (4)
Hi @Seismic-wave-Han , you are right. The reported value for 'AKGG.AV_20060814223729_EV' is azimuth not the back azimuth.I used the same function from Obspy. And this is how it was calculated during the compiling of the dataset:
distanceKm, azimuth, back_azimuth = obspy.geodetics.base.gps2dist_azimuth(
float(event_lat),
float(event_lon),
float(station_lat),
float(station_lon),
a=6378137.0,
f=0.0033528106647474805)
distanceKm = (distanceKm/1000);
distance = round((distanceKm / 111), 4);
back_azimuth = round(back_azimuth, 4)
However, I haven't figured out what went wrong yet. I checked the station lat and long and they are correct. So no flipping of the event-station coordinates. Could you tell me how many of these you found in the dataset?
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Hi @smousavi05. I prepared some figures related to the error of back-azimuth (also, distance)
These figures are the back-azimuth error along with whole samples and their histogram.
Samples with errors in the 170-190 degree range are 8% of the total.
I also found the distance discrepancy with obspy.
The error of distance is nearly zero, but it shows quite a large error for some samples.
I hope this information will help you find systematic errors in STEAD.
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I have downloaded all the chunks of the dataset and trying to run the code but not getting the image folder in the dataset. Can you please help
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Related Issues (19)
- Data-download HOT 2
- Obtaining STEAD data HOT 4
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- STEAD Data filtering HOT 1
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- I wondered why each waveform has a 60 seconds ground motion in STEAD. Is there any scientific evidence behind it? HOT 2
- sample rate HOT 1
- removal of instrument response
- dont download data HOT 2
- pick data HOT 2
- Add link to license in readme HOT 1
- Acceleration Data Acquisition Method HOT 2
- Downloading only the csv files HOT 2
- Inquiry about Computation Algorithm for coda_end_sample
- 数据下载
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