LA ROCHE-EN-ARDENNE (BE)
Quarry blast12 May 2021
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 14:03:012021-05-12
- UTC
- 12:03:012021-05-12
Main parameters
| Date and time | 2021-05-12 12:03:01 UTC 2021-05-12 14:03:01 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.199° N, 5.605° E Uncertainty ± 0.8 km |
| Event ID | ROB 13440 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-05-17 10:51:24 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
- 5
- Epicentral distance
- 27.4 – 53.9km
- Mean velocity, P wave
- 6.0km/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: 5 measurements, root-mean-square deviation 0.21 s. S wave: 5 measurements, root-mean-square deviation 0.24 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)5 stations | |||||
| RCHRochefort | 27.4 | 260 | 12:03:05.92+4.74 s | 12:03:09.87+8.69 s | 3.95 |
| CLAClavier | 32.6 | 319 | 12:03:06.92+5.74 s | 12:03:11.50+10.32 s | 4.58 |
| KLBKalborn | 37.7 | 107 | 12:03:08.09+6.91 s | 12:03:12.80+11.62 s | 4.71 |
| GESGesves | 42.3 | 299 | 12:03:08.68+7.50 s | 12:03:14.35+13.17 s | 5.67 |
| MEMHMembach | 53.9 | 32 | 12:03:10.91+9.73 s | 12:03:17.14+15.96 s | 6.23 |