TOURNAI (BE)
Quarry blast26 May 2021
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 13:00:542021-05-26
- UTC
- 11:00:542021-05-26
Main parameters
| Date and time | 2021-05-26 11:00:54 UTC 2021-05-26 13:00:54 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.624° N, 3.434° E Uncertainty ± 13.2 km |
| Event ID | ROB 13535 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-05-26 20:23:49 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
- 7
- Epicentral distance
- 30.5 – 101.4km
- Mean velocity, P wave
- 4.9km/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: 7 measurements, root-mean-square deviation 0.65 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)7 stations | |||||
| LESLessines | 30.5 | 71 | 11:01:00.34+5.81 s | 11:01:04.31+9.78 s | 3.97 |
| BOUBougnies | 44.7 | 126 | 11:01:02.88+8.35 s | – | – |
| SKQSteenkerque | 45.8 | 86 | 11:01:02.47+7.94 s | 11:01:09.33+14.80 s | 6.86 |
| BRQBracquegnies | 52.2 | 107 | 11:01:03.59+9.06 s | – | – |
| RQRRonquières | 56.0 | 92 | 11:01:03.92+9.39 s | – | – |
| SNFSeneffe | 61.5 | 101 | 11:01:04.86+10.33 s | – | – |
| DOUDourbes | 101.4 | 125 | 11:01:14.53+20.00 s | 11:01:25.62+31.09 s | 11.09 |
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