BRAINE-LE-COMTE (BE)
Quarry blast13 April 2021
- Magnitude
- 0.8ML
- Depth
- –
- Belgian time
- 13:05:282021-04-13
- UTC
- 11:05:282021-04-13
Main parameters
| Date and time | 2021-04-13 11:05:28 UTC 2021-04-13 13:05:28 Belgian time |
|---|---|
| Magnitude | ML 0.8 |
| Epicentral coordinates | 50.571° N, 4.108° E Uncertainty ± 0.8 km |
| Event ID | ROB 13110 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-04-13 14:08:39 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
- 8.9 – 29.5km
- Mean velocity, P wave
- 5.7km/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 0.09 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 | |||||
| SKQSteenkerque | 8.9 | 347 | 11:05:29.78+1.71 s | 11:05:31.09+3.02 s | 1.31 |
| RQRRonquières | 9.1 | 65 | 11:05:30.08+2.01 s | – | – |
| BRQBracquegnies | 10.2 | 169 | 11:05:30.08+2.01 s | – | – |
| SNFSeneffe | 14.1 | 118 | 11:05:30.88+2.81 s | – | – |
| TGATangissart | 29.5 | 83 | 11:05:33.52+5.45 s | 11:05:37.03+8.96 s | 3.51 |
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