COMBLAIN-AU-PONT (BE)
Quarry blast20 May 2021
- Magnitude
- 1.3ML
- Depth
- –
- Belgian time
- 13:38:412021-05-20
- UTC
- 11:38:412021-05-20
Main parameters
| Date and time | 2021-05-20 11:38:41 UTC 2021-05-20 13:38:41 Belgian time |
|---|---|
| Magnitude | ML 1.3 |
| Epicentral coordinates | 50.485° N, 5.561° E Uncertainty ± 1.5 km |
| Event ID | ROB 13495 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-05-21 16:51:20 Belgian time
Location map
- Epicentre
- Station that recorded the event
Arrival times at the stations
Each station first records the P wave, the fastest, then the S wave. The farther a station is from the epicentre, the later the waves reach it and the wider the gap between the two.
- Stations
- 8
- Epicentral distance
- 19.8 – 81.4km
- Mean velocity, P wave
- 5.2km/s
- P wave
- S wave
- Curve fitted to the measurements
Notes and method
Curves: travel time of a direct wave in a homogeneous medium. The velocity of each wave and an origin-time shift, common to both, are fitted to the measurements by least squares. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 8 measurements, root-mean-square deviation 0.14 s.
Station measurements
P- and S-wave arrivals and ground displacement measured at each station. Click a column heading to change the order.
| km | ° | UTC | UTC | s | |
|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)7 stations | |||||
| CLAClavier | 19.8 | 248 | 11:38:44.89+3.15 s | 11:38:48.22+6.48 s | 3.33 |
| MEMHMembach | 34.7 | 66 | 11:38:47.90+6.16 s | – | – |
| MEMSMembach | 34.7 | 66 | 11:38:48.01+6.27 s | – | – |
| HOUHouvegnez | 34.7 | 115 | 11:38:48.22+6.48 s | – | – |
| GESGesves | 35.5 | 252 | 11:38:47.91+6.17 s | – | – |
| MRGMont Rigi | 36.6 | 85 | 11:38:48.29+6.55 s | 11:38:52.88+11.14 s | 4.59 |
| DOUDourbes | 81.4 | 238 | 11:38:56.83+15.09 s | 11:39:06.22+24.48 s | 9.39 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 40.6 | 40 | 11:38:48.96+7.22 s | – | – |
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