BRAINE-LE-COMTE (BE)
Quarry blast1 July 2021
- Magnitude
- 1.0ML
- Depth
- –
- Belgian time
- 11:27:222021-07-01
- UTC
- 09:27:222021-07-01
Main parameters
| Date and time | 2021-07-01 09:27:22 UTC 2021-07-01 11:27:22 Belgian time |
|---|---|
| Magnitude | ML 1.0 |
| Epicentral coordinates | 50.660° N, 4.178° E Uncertainty ± 1.1 km |
| Event ID | ROB 13830 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-07-05 12:24:12 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
- 6.8 – 69.5km
- Mean velocity, P wave
- 6.3km/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: 6 measurements, root-mean-square deviation 0.19 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 | |||||
| RQRRonquières | 6.8 | 151 | 09:27:24.57+1.72 s | – | – |
| SKQSteenkerque | 7.0 | 260 | 09:27:24.34+1.49 s | 09:27:25.14+2.29 s | 0.80 |
| SNFSeneffe | 18.2 | 155 | 09:27:26.71+3.86 s | – | – |
| UCCBUccle | 20.0 | 40 | 09:27:26.80+3.95 s | 09:27:29.27+6.42 s | 2.47 |
| TGATangissart | 25.1 | 104 | 09:27:27.31+4.46 s | 09:27:30.54+7.69 s | 3.23 |
| DOUDourbes | 69.5 | 155 | 09:27:34.54+11.69 s | – | – |
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