COMBLAIN-AU-PONT (BE)
Quarry blast11 May 2021
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 13:54:042021-05-11
- UTC
- 11:54:042021-05-11
Main parameters
| Date and time | 2021-05-11 11:54:04 UTC 2021-05-11 13:54:04 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.507° N, 5.560° E Uncertainty ± 1.8 km |
| Event ID | ROB 13425 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-05-11 17:08:17 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
- 10
- Epicentral distance
- 20.8 – 82.6km
- Mean velocity, P wave
- 6.0km/s
- Mean velocity, S wave
- 3.5km/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: 10 measurements, root-mean-square deviation 0.52 s. S wave: 8 measurements, root-mean-square deviation 0.39 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)9 stations | |||||
| CLAClavier | 20.8 | 242 | 11:54:07.11+2.73 s | 11:54:10.61+6.23 s | 3.50 |
| MEMSMembach | 33.8 | 70 | 11:54:10.08+5.70 s | 11:54:14.96+10.58 s | 4.88 |
| HOUHouvegnez | 35.9 | 118 | 11:54:10.56+6.18 s | 11:54:15.15+10.77 s | 4.59 |
| GESGesves | 36.2 | 248 | 11:54:10.11+5.73 s | 11:54:15.23+10.85 s | 5.12 |
| MRGMont Rigi | 36.5 | 89 | 11:54:10.53+6.15 s | 11:54:15.42+11.04 s | 4.89 |
| RCHRochefort | 45.8 | 211 | 11:54:13.36+8.98 s | – | – |
| KLBKalborn | 59.9 | 139 | 11:54:14.71+10.33 s | 11:54:21.76+17.38 s | 7.05 |
| MRDMaredsous | 60.8 | 248 | 11:54:14.49+10.11 s | – | – |
| DOUDourbes | 82.6 | 237 | 11:54:18.66+14.28 s | 11:54:27.81+23.43 s | 9.15 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 38.8 | 42 | 11:54:11.21+6.83 s | 11:54:16.41+12.03 s | 5.20 |