COMBLAIN-AU-PONT (BE)
Quarry blast27 September 2021
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 11:48:342021-09-27
- UTC
- 09:48:342021-09-27
Main parameters
| Date and time | 2021-09-27 09:48:34 UTC 2021-09-27 11:48:34 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.497° N, 5.558° E Uncertainty ± 0.9 km |
| Event ID | ROB 14495 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-09-29 14:03:46 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
- 9.6 – 81.9km
- Mean velocity, P wave
- 5.6km/s
- Mean velocity, S wave
- 3.2km/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: 10 measurements, root-mean-square deviation 0.61 s. S wave: 9 measurements, root-mean-square deviation 0.31 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 | |||||
| STISart Tilman | 9.6 | 3 | 09:48:35.95+1.66 s | – | – |
| CLAClavier | 20.1 | 245 | 09:48:37.40+3.11 s | 09:48:40.49+6.20 s | 3.09 |
| MEMSMembach | 34.4 | 69 | 09:48:38.88+4.59 s | 09:48:45.13+10.84 s | 6.25 |
| MEMHMembach | 34.4 | 69 | 09:48:38.88+4.59 s | 09:48:44.69+10.40 s | 5.81 |
| GESGesves | 35.7 | 250 | 09:48:40.39+6.10 s | 09:48:45.33+11.04 s | 4.94 |
| TNLTernell | 41.8 | 76 | 09:48:41.55+7.26 s | 09:48:46.88+12.59 s | 5.33 |
| RCHRochefort | 44.7 | 212 | 09:48:42.32+8.03 s | 09:48:47.97+13.68 s | 5.65 |
| KLBKalborn | 59.1 | 138 | 09:48:44.86+10.57 s | 09:48:51.92+17.63 s | 7.06 |
| DOUDourbes | 81.9 | 237 | 09:48:48.96+14.67 s | 09:48:58.85+24.56 s | 9.89 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 39.8 | 42 | 09:48:41.40+7.11 s | 09:48:46.61+12.32 s | 5.21 |