LA ROCHE-EN-ARDENNE (BE)
Quarry blast4 September 2020
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 14:17:202020-09-04
- UTC
- 12:17:202020-09-04
Main parameters
| Date and time | 2020-09-04 12:17:20 UTC 2020-09-04 14:17:20 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.185° N, 5.589° E Uncertainty ± 0.4 km |
| Event ID | ROB 10795 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-09-04 16:14:03 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
- 12
- Epicentral distance
- 26.1 – 89.1km
- Mean velocity, P wave
- 5.9km/s
- Mean velocity, S wave
- 3.3km/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: 12 measurements, root-mean-square deviation 0.23 s. S wave: 6 measurements, root-mean-square deviation 0.62 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)11 stations | |||||
| RCHRochefort | 26.1 | 263 | 12:17:24.92+4.75 s | 12:17:28.86+8.69 s | 3.94 |
| CLAClavier | 33.1 | 322 | 12:17:25.96+5.79 s | 12:17:31.52+11.35 s | 5.56 |
| HOUHouvegnez | 35.1 | 58 | 12:17:26.02+5.85 s | – | – |
| KLBKalborn | 38.4 | 104 | 12:17:26.99+6.82 s | 12:17:32.00+11.83 s | 5.01 |
| GESGesves | 42.1 | 302 | 12:17:27.67+7.50 s | 12:17:33.47+13.30 s | 5.80 |
| MRGMont Rigi | 50.1 | 44 | 12:17:29.02+8.85 s | – | – |
| MEMSMembach | 55.8 | 32 | 12:17:29.88+9.71 s | 12:17:36.48+16.31 s | 6.60 |
| MEMHMembach | 55.8 | 32 | 12:17:29.94+9.77 s | – | – |
| EBNEben-Emael | 68.3 | 5 | 12:17:32.65+12.48 s | – | – |
| DOUDourbes | 71.7 | 262 | 12:17:32.57+12.40 s | 12:17:42.81+22.64 s | 10.24 |
| TGATangissart | 89.1 | 302 | 12:17:35.50+15.33 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 68.8 | 21 | 12:17:32.20+12.03 s | – | – |