LA ROCHE-EN-ARDENNE (BE)
Quarry blast24 August 2020
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 15:30:142020-08-24
- UTC
- 13:30:142020-08-24
Main parameters
| Date and time | 2020-08-24 13:30:14 UTC 2020-08-24 15:30:14 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.199° N, 5.593° E Uncertainty ± 0.7 km |
| Event ID | ROB 10730 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-08-24 16:56:06 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
- 9
- Epicentral distance
- 26.6 – 72.2km
- Mean velocity, P wave
- 5.8km/s
- Mean velocity, S wave
- 3.4km/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: 9 measurements, root-mean-square deviation 0.13 s. S wave: 7 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)8 stations | |||||
| RCHRochefort | 26.6 | 259 | 13:30:19.21+4.65 s | 13:30:22.57+8.01 s | 3.36 |
| CLAClavier | 32.0 | 320 | 13:30:20.43+5.87 s | 13:30:24.82+10.26 s | 4.39 |
| HOUHouvegnez | 34.1 | 59 | 13:30:20.51+5.95 s | 13:30:24.16+9.60 s | 3.65 |
| KLBKalborn | 38.5 | 106 | 13:30:21.59+7.03 s | 13:30:26.36+11.80 s | 4.77 |
| GESGesves | 41.5 | 300 | 13:30:22.18+7.62 s | 13:30:27.05+12.49 s | 4.87 |
| MRGMont Rigi | 48.8 | 45 | 13:30:23.26+8.70 s | – | – |
| MEMHMembach | 54.4 | 33 | 13:30:24.14+9.58 s | 13:30:30.34+15.78 s | 6.20 |
| DOUDourbes | 72.2 | 261 | 13:30:27.18+12.62 s | 13:30:36.20+21.64 s | 9.02 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 67.3 | 21 | 13:30:26.29+11.73 s | – | – |