ROCHEFORT (BE)
Quarry blast4 August 2021
- Magnitude
- 0.8ML
- Depth
- –
- Belgian time
- 14:28:582021-08-04
- UTC
- 12:28:582021-08-04
Main parameters
| Date and time | 2021-08-04 12:28:58 UTC 2021-08-04 14:28:58 Belgian time |
|---|---|
| Magnitude | ML 0.8 |
| Epicentral coordinates | 50.103° N, 5.165° E Uncertainty ± 2.3 km |
| Event ID | ROB 14190 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-08-06 18:30:10 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
- 7.3 – 98.2km
- Mean velocity, P wave
- 5.6km/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 0.25 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 | 7.3 | 38 | 12:28:59.74+1.57 s | 12:29:00.37+2.20 s | 0.63 |
| GESGesves | 31.8 | 350 | 12:29:04.06+5.89 s | – | – |
| MRDMaredsous | 35.9 | 308 | 12:29:04.71+6.54 s | – | – |
| DOUDourbes | 40.8 | 269 | 12:29:05.43+7.26 s | 12:29:10.42+12.25 s | 4.99 |
| KLBKalborn | 67.5 | 90 | 12:29:09.94+11.77 s | – | – |
| SKQSteenkerque | 98.2 | 309 | 12:29:16.23+18.06 s | – | – |
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