LA ROCHE-EN-ARDENNE (BE)
Quarry blast9 July 2021
- Magnitude
- 1.1ML
- Depth
- –
- Belgian time
- 14:03:032021-07-09
- UTC
- 12:03:032021-07-09
Main parameters
| Date and time | 2021-07-09 12:03:03 UTC 2021-07-09 14:03:03 Belgian time |
|---|---|
| Magnitude | ML 1.1 |
| Epicentral coordinates | 50.190° N, 5.573° E Uncertainty ± 0.4 km |
| Event ID | ROB 14000 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-07-26 11:57:41 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
- 6
- Epicentral distance
- 25.0 – 70.7km
- 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: 6 measurements, root-mean-square deviation 0.09 s. S wave: 4 measurements, root-mean-square deviation 0.16 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)6 stations | |||||
| RCHRochefort | 25.0 | 261 | 12:03:08.32+4.70 s | 12:03:11.34+7.72 s | 3.02 |
| CLAClavier | 31.9 | 323 | 12:03:09.45+5.83 s | 12:03:13.36+9.74 s | 3.91 |
| KLBKalborn | 39.6 | 104 | 12:03:10.58+6.96 s | 12:03:15.33+11.71 s | 4.75 |
| MEMHMembach | 56.0 | 34 | 12:03:13.41+9.79 s | 12:03:20.61+16.99 s | 7.20 |
| MEMSMembach | 56.0 | 34 | 12:03:13.48+9.86 s | – | – |
| DOUDourbes | 70.7 | 262 | 12:03:16.10+12.48 s | – | – |