WALCOURT (BE)
Quarry blast2 April 2020
- Magnitude
- 0.9ML
- Depth
- –
- Belgian time
- 13:37:082020-04-02
- UTC
- 11:37:082020-04-02
Main parameters
| Date and time | 2020-04-02 11:37:08 UTC 2020-04-02 13:37:08 Belgian time |
|---|---|
| Magnitude | ML 0.9 |
| Epicentral coordinates | 50.224° N, 4.478° E Uncertainty ± 1.4 km |
| Event ID | ROB 9720 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-04-02 14:38:18 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
- 16.6 – 55.1km
- Mean velocity, P wave
- 6.0km/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 0.23 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 | |||||
| DOUDourbes | 16.6 | 150 | 11:37:11.90+3.13 s | 11:37:14.19+5.42 s | 2.29 |
| MRDMaredsous | 22.5 | 67 | 11:37:13.41+4.64 s | 11:37:15.93+7.16 s | 2.52 |
| TGATangissart | 42.6 | 4 | 11:37:16.08+7.31 s | – | – |
| RCHRochefort | 54.0 | 98 | 11:37:18.44+9.67 s | – | – |
| SKQSteenkerque | 55.1 | 329 | 11:37:18.49+9.72 s | – | – |
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